text: /*!
   * Chart.js v2.8.0
   * https://www.chartjs.org
   * (c) 2019 Chart.js Contributors
   * Released under the MIT License
   */
  (function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(function () {
          try {
            return require('moment');
          } catch (e) {
          }
        }()) :
        typeof define === 'function' && define.amd ? define(['require'], function (require) {
              return factory(function () {
                try {
                  return require('moment');
                } catch (e) {
                }
              }());
            }) :
            (global.Chart = factory(global.moment));
  }(this, (function (moment) {
    'use strict';
  
    moment = moment && moment.hasOwnProperty('default') ? moment['default'] : moment;
  
    /* MIT license */
  
    var conversions = {
      rgb2hsl: rgb2hsl,
      rgb2hsv: rgb2hsv,
      rgb2hwb: rgb2hwb,
      rgb2cmyk: rgb2cmyk,
      rgb2keyword: rgb2keyword,
      rgb2xyz: rgb2xyz,
      rgb2lab: rgb2lab,
      rgb2lch: rgb2lch,
  
      hsl2rgb: hsl2rgb,
      hsl2hsv: hsl2hsv,
      hsl2hwb: hsl2hwb,
      hsl2cmyk: hsl2cmyk,
      hsl2keyword: hsl2keyword,
  
      hsv2rgb: hsv2rgb,
      hsv2hsl: hsv2hsl,
      hsv2hwb: hsv2hwb,
      hsv2cmyk: hsv2cmyk,
      hsv2keyword: hsv2keyword,
  
      hwb2rgb: hwb2rgb,
      hwb2hsl: hwb2hsl,
      hwb2hsv: hwb2hsv,
      hwb2cmyk: hwb2cmyk,
      hwb2keyword: hwb2keyword,
  
      cmyk2rgb: cmyk2rgb,
      cmyk2hsl: cmyk2hsl,
      cmyk2hsv: cmyk2hsv,
      cmyk2hwb: cmyk2hwb,
      cmyk2keyword: cmyk2keyword,
  
      keyword2rgb: keyword2rgb,
      keyword2hsl: keyword2hsl,
      keyword2hsv: keyword2hsv,
      keyword2hwb: keyword2hwb,
      keyword2cmyk: keyword2cmyk,
      keyword2lab: keyword2lab,
      keyword2xyz: keyword2xyz,
  
      xyz2rgb: xyz2rgb,
      xyz2lab: xyz2lab,
      xyz2lch: xyz2lch,
  
      lab2xyz: lab2xyz,
      lab2rgb: lab2rgb,
      lab2lch: lab2lch,
  
      lch2lab: lch2lab,
      lch2xyz: lch2xyz,
      lch2rgb: lch2rgb
    };
  
  
    function rgb2hsl(rgb) {
      var r = rgb[0] / 255,
          g = rgb[1] / 255,
          b = rgb[2] / 255,
          min = Math.min(r, g, b),
          max = Math.max(r, g, b),
          delta = max - min,
          h, s, l;
  
      if (max == min)
        h = 0;
      else if (r == max)
        h = (g - b) / delta;
      else if (g == max)
        h = 2 + (b - r) / delta;
      else if (b == max)
        h = 4 + (r - g) / delta;
  
      h = Math.min(h * 60, 360);
  
      if (h < 0)
        h += 360;
  
      l = (min + max) / 2;
  
      if (max == min)
        s = 0;
      else if (l <= 0.5)
        s = delta / (max + min);
      else
        s = delta / (2 - max - min);
  
      return [h, s * 100, l * 100];
    }
  
    function rgb2hsv(rgb) {
      var r = rgb[0],
          g = rgb[1],
          b = rgb[2],
          min = Math.min(r, g, b),
          max = Math.max(r, g, b),
          delta = max - min,
          h, s, v;
  
      if (max == 0)
        s = 0;
      else
        s = (delta / max * 1000) / 10;
  
      if (max == min)
        h = 0;
      else if (r == max)
        h = (g - b) / delta;
      else if (g == max)
        h = 2 + (b - r) / delta;
      else if (b == max)
        h = 4 + (r - g) / delta;
  
      h = Math.min(h * 60, 360);
  
      if (h < 0)
        h += 360;
  
      v = ((max / 255) * 1000) / 10;
  
      return [h, s, v];
    }
  
    function rgb2hwb(rgb) {
      var r = rgb[0],
          g = rgb[1],
          b = rgb[2],
          h = rgb2hsl(rgb)[0],
          w = 1 / 255 * Math.min(r, Math.min(g, b)),
          b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));
  
      return [h, w * 100, b * 100];
    }
  
    function rgb2cmyk(rgb) {
      var r = rgb[0] / 255,
          g = rgb[1] / 255,
          b = rgb[2] / 255,
          c, m, y, k;
  
      k = Math.min(1 - r, 1 - g, 1 - b);
      c = (1 - r - k) / (1 - k) || 0;
      m = (1 - g - k) / (1 - k) || 0;
      y = (1 - b - k) / (1 - k) || 0;
      return [c * 100, m * 100, y * 100, k * 100];
    }
  
    function rgb2keyword(rgb) {
      return reverseKeywords[JSON.stringify(rgb)];
    }
  
    function rgb2xyz(rgb) {
      var r = rgb[0] / 255,
          g = rgb[1] / 255,
          b = rgb[2] / 255;
  
      // assume sRGB
      r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
      g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
      b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);
  
      var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
      var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
      var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
  
      return [x * 100, y * 100, z * 100];
    }
  
    function rgb2lab(rgb) {
      var xyz = rgb2xyz(rgb),
          x = xyz[0],
          y = xyz[1],
          z = xyz[2],
          l, a, b;
  
      x /= 95.047;
      y /= 100;
      z /= 108.883;
  
      x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
      y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
      z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);
  
      l = (116 * y) - 16;
      a = 500 * (x - y);
      b = 200 * (y - z);
  
      return [l, a, b];
    }
  
    function rgb2lch(args) {
      return lab2lch(rgb2lab(args));
    }
  
    function hsl2rgb(hsl) {
      var h = hsl[0] / 360,
          s = hsl[1] / 100,
          l = hsl[2] / 100,
          t1, t2, t3, rgb, val;
  
      if (s == 0) {
        val = l * 255;
        return [val, val, val];
      }
  
      if (l < 0.5)
        t2 = l * (1 + s);
      else
        t2 = l + s - l * s;
      t1 = 2 * l - t2;
  
      rgb = [0, 0, 0];
      for (var i = 0; i < 3; i++) {
        t3 = h + 1 / 3 * -(i - 1);
        t3 < 0 && t3++;
        t3 > 1 && t3--;
  
        if (6 * t3 < 1)
          val = t1 + (t2 - t1) * 6 * t3;
        else if (2 * t3 < 1)
          val = t2;
        else if (3 * t3 < 2)
          val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
        else
          val = t1;
  
        rgb[i] = val * 255;
      }
  
      return rgb;
    }
  
    function hsl2hsv(hsl) {
      var h = hsl[0],
          s = hsl[1] / 100,
          l = hsl[2] / 100,
          sv, v;
  
      if (l === 0) {
        // no need to do calc on black
        // also avoids divide by 0 error
        return [0, 0, 0];
      }
  
      l *= 2;
      s *= (l <= 1) ? l : 2 - l;
      v = (l + s) / 2;
      sv = (2 * s) / (l + s);
      return [h, sv * 100, v * 100];
    }
  
    function hsl2hwb(args) {
      return rgb2hwb(hsl2rgb(args));
    }
  
    function hsl2cmyk(args) {
      return rgb2cmyk(hsl2rgb(args));
    }
  
    function hsl2keyword(args) {
      return rgb2keyword(hsl2rgb(args));
    }
  
  
    function hsv2rgb(hsv) {
      var h = hsv[0] / 60,
          s = hsv[1] / 100,
          v = hsv[2] / 100,
          hi = Math.floor(h) % 6;
  
      var f = h - Math.floor(h),
          p = 255 * v * (1 - s),
          q = 255 * v * (1 - (s * f)),
          t = 255 * v * (1 - (s * (1 - f))),
          v = 255 * v;
  
      switch (hi) {
        case 0:
          return [v, t, p];
        case 1:
          return [q, v, p];
        case 2:
          return [p, v, t];
        case 3:
          return [p, q, v];
        case 4:
          return [t, p, v];
        case 5:
          return [v, p, q];
      }
    }
  
    function hsv2hsl(hsv) {
      var h = hsv[0],
          s = hsv[1] / 100,
          v = hsv[2] / 100,
          sl, l;
  
      l = (2 - s) * v;
      sl = s * v;
      sl /= (l <= 1) ? l : 2 - l;
      sl = sl || 0;
      l /= 2;
      return [h, sl * 100, l * 100];
    }
  
    function hsv2hwb(args) {
      return rgb2hwb(hsv2rgb(args))
    }
  
    function hsv2cmyk(args) {
      return rgb2cmyk(hsv2rgb(args));
    }
  
    function hsv2keyword(args) {
      return rgb2keyword(hsv2rgb(args));
    }
  
  // http://dev.w3.org/csswg/css-color/#hwb-to-rgb
    function hwb2rgb(hwb) {
      var h = hwb[0] / 360,
          wh = hwb[1] / 100,
          bl = hwb[2] / 100,
          ratio = wh + bl,
          i, v, f, n;
  
      // wh + bl cant be > 1
      if (ratio > 1) {
        wh /= ratio;
        bl /= ratio;
      }
  
      i = Math.floor(6 * h);
      v = 1 - bl;
      f = 6 * h - i;
      if ((i & 0x01) != 0) {
        f = 1 - f;
      }
      n = wh + f * (v - wh);  // linear interpolation
  
      switch (i) {
        default:
        case 6:
        case 0:
          r = v;
          g = n;
          b = wh;
          break;
        case 1:
          r = n;
          g = v;
          b = wh;
          break;
        case 2:
          r = wh;
          g = v;
          b = n;
          break;
        case 3:
          r = wh;
          g = n;
          b = v;
          break;
        case 4:
          r = n;
          g = wh;
          b = v;
          break;
        case 5:
          r = v;
          g = wh;
          b = n;
          break;
      }
  
      return [r * 255, g * 255, b * 255];
    }
  
    function hwb2hsl(args) {
      return rgb2hsl(hwb2rgb(args));
    }
  
    function hwb2hsv(args) {
      return rgb2hsv(hwb2rgb(args));
    }
  
    function hwb2cmyk(args) {
      return rgb2cmyk(hwb2rgb(args));
    }
  
    function hwb2keyword(args) {
      return rgb2keyword(hwb2rgb(args));
    }
  
    function cmyk2rgb(cmyk) {
      var c = cmyk[0] / 100,
          m = cmyk[1] / 100,
          y = cmyk[2] / 100,
          k = cmyk[3] / 100,
          r, g, b;
  
      r = 1 - Math.min(1, c * (1 - k) + k);
      g = 1 - Math.min(1, m * (1 - k) + k);
      b = 1 - Math.min(1, y * (1 - k) + k);
      return [r * 255, g * 255, b * 255];
    }
  
    function cmyk2hsl(args) {
      return rgb2hsl(cmyk2rgb(args));
    }
  
    function cmyk2hsv(args) {
      return rgb2hsv(cmyk2rgb(args));
    }
  
    function cmyk2hwb(args) {
      return rgb2hwb(cmyk2rgb(args));
    }
  
    function cmyk2keyword(args) {
      return rgb2keyword(cmyk2rgb(args));
    }
  
  
    function xyz2rgb(xyz) {
      var x = xyz[0] / 100,
          y = xyz[1] / 100,
          z = xyz[2] / 100,
          r, g, b;
  
      r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
      g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
      b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
  
      // assume sRGB
      r = r > 0.0031308 ? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
          : r = (r * 12.92);
  
      g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
          : g = (g * 12.92);
  
      b = b > 0.0031308 ? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
          : b = (b * 12.92);
  
      r = Math.min(Math.max(0, r), 1);
      g = Math.min(Math.max(0, g), 1);
      b = Math.min(Math.max(0, b), 1);
  
      return [r * 255, g * 255, b * 255];
    }
  
    function xyz2lab(xyz) {
      var x = xyz[0],
          y = xyz[1],
          z = xyz[2],
          l, a, b;
  
      x /= 95.047;
      y /= 100;
      z /= 108.883;
  
      x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
      y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
      z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);
  
      l = (116 * y) - 16;
      a = 500 * (x - y);
      b = 200 * (y - z);
  
      return [l, a, b];
    }
  
    function xyz2lch(args) {
      return lab2lch(xyz2lab(args));
    }
  
    function lab2xyz(lab) {
      var l = lab[0],
          a = lab[1],
          b = lab[2],
          x, y, z, y2;
  
      if (l <= 8) {
        y = (l * 100) / 903.3;
        y2 = (7.787 * (y / 100)) + (16 / 116);
      } else {
        y = 100 * Math.pow((l + 16) / 116, 3);
        y2 = Math.pow(y / 100, 1 / 3);
      }
  
      x = x / 95.047 <= 0.008856 ? x = (95.047 * ((a / 500) + y2 - (16 / 116))) / 7.787 : 95.047 * Math.pow((a / 500) + y2, 3);
  
      z = z / 108.883 <= 0.008859 ? z = (108.883 * (y2 - (b / 200) - (16 / 116))) / 7.787 : 108.883 * Math.pow(y2 - (b / 200), 3);
  
      return [x, y, z];
    }
  
    function lab2lch(lab) {
      var l = lab[0],
          a = lab[1],
          b = lab[2],
          hr, h, c;
  
      hr = Math.atan2(b, a);
      h = hr * 360 / 2 / Math.PI;
      if (h < 0) {
        h += 360;
      }
      c = Math.sqrt(a * a + b * b);
      return [l, c, h];
    }
  
    function lab2rgb(args) {
      return xyz2rgb(lab2xyz(args));
    }
  
    function lch2lab(lch) {
      var l = lch[0],
          c = lch[1],
          h = lch[2],
          a, b, hr;
  
      hr = h / 360 * 2 * Math.PI;
      a = c * Math.cos(hr);
      b = c * Math.sin(hr);
      return [l, a, b];
    }
  
    function lch2xyz(args) {
      return lab2xyz(lch2lab(args));
    }
  
    function lch2rgb(args) {
      return lab2rgb(lch2lab(args));
    }
  
    function keyword2rgb(keyword) {
      return cssKeywords[keyword];
    }
  
    function keyword2hsl(args) {
      return rgb2hsl(keyword2rgb(args));
    }
  
    function keyword2hsv(args) {
      return rgb2hsv(keyword2rgb(args));
    }
  
    function keyword2hwb(args) {
      return rgb2hwb(keyword2rgb(args));
    }
  
    function keyword2cmyk(args) {
      return rgb2cmyk(keyword2rgb(args));
    }
  
    function keyword2lab(args) {
      return rgb2lab(keyword2rgb(args));
    }
  
    function keyword2xyz(args) {
      return rgb2xyz(keyword2rgb(args));
    }
  
    var cssKeywords = {
      aliceblue: [240, 248, 255],
      antiquewhite: [250, 235, 215],
      aqua: [0, 255, 255],
      aquamarine: [127, 255, 212],
      azure: [240, 255, 255],
      beige: [245, 245, 220],
      bisque: [255, 228, 196],
      black: [0, 0, 0],
      blanchedalmond: [255, 235, 205],
      blue: [0, 0, 255],
      blueviolet: [138, 43, 226],
      brown: [165, 42, 42],
      burlywood: [222, 184, 135],
      cadetblue: [95, 158, 160],
      chartreuse: [127, 255, 0],
      chocolate: [210, 105, 30],
      coral: [255, 127, 80],
      cornflowerblue: [100, 149, 237],
      cornsilk: [255, 248, 220],
      crimson: [220, 20, 60],
      cyan: [0, 255, 255],
      darkblue: [0, 0, 139],
      darkcyan: [0, 139, 139],
      darkgoldenrod: [184, 134, 11],
      darkgray: [169, 169, 169],
      darkgreen: [0, 100, 0],
      darkgrey: [169, 169, 169],
      darkkhaki: [189, 183, 107],
      darkmagenta: [139, 0, 139],
      darkolivegreen: [85, 107, 47],
      darkorange: [255, 140, 0],
      darkorchid: [153, 50, 204],
      darkred: [139, 0, 0],
      darksalmon: [233, 150, 122],
      darkseagreen: [143, 188, 143],
      darkslateblue: [72, 61, 139],
      darkslategray: [47, 79, 79],
      darkslategrey: [47, 79, 79],
      darkturquoise: [0, 206, 209],
      darkviolet: [148, 0, 211],
      deeppink: [255, 20, 147],
      deepskyblue: [0, 191, 255],
      dimgray: [105, 105, 105],
      dimgrey: [105, 105, 105],
      dodgerblue: [30, 144, 255],
      firebrick: [178, 34, 34],
      floralwhite: [255, 250, 240],
      forestgreen: [34, 139, 34],
      fuchsia: [255, 0, 255],
      gainsboro: [220, 220, 220],
      ghostwhite: [248, 248, 255],
      gold: [255, 215, 0],
      goldenrod: [218, 165, 32],
      gray: [128, 128, 128],
      green: [0, 128, 0],
      greenyellow: [173, 255, 47],
      grey: [128, 128, 128],
      honeydew: [240, 255, 240],
      hotpink: [255, 105, 180],
      indianred: [205, 92, 92],
      indigo: [75, 0, 130],
      ivory: [255, 255, 240],
      khaki: [240, 230, 140],
      lavender: [230, 230, 250],
      lavenderblush: [255, 240, 245],
      lawngreen: [124, 252, 0],
      lemonchiffon: [255, 250, 205],
      lightblue: [173, 216, 230],
      lightcoral: [240, 128, 128],
      lightcyan: [224, 255, 255],
      lightgoldenrodyellow: [250, 250, 210],
      lightgray: [211, 211, 211],
      lightgreen: [144, 238, 144],
      lightgrey: [211, 211, 211],
      lightpink: [255, 182, 193],
      lightsalmon: [255, 160, 122],
      lightseagreen: [32, 178, 170],
      lightskyblue: [135, 206, 250],
      lightslategray: [119, 136, 153],
      lightslategrey: [119, 136, 153],
      lightsteelblue: [176, 196, 222],
      lightyellow: [255, 255, 224],
      lime: [0, 255, 0],
      limegreen: [50, 205, 50],
      linen: [250, 240, 230],
      magenta: [255, 0, 255],
      maroon: [128, 0, 0],
      mediumaquamarine: [102, 205, 170],
      mediumblue: [0, 0, 205],
      mediumorchid: [186, 85, 211],
      mediumpurple: [147, 112, 219],
      mediumseagreen: [60, 179, 113],
      mediumslateblue: [123, 104, 238],
      mediumspringgreen: [0, 250, 154],
      mediumturquoise: [72, 209, 204],
      mediumvioletred: [199, 21, 133],
      midnightblue: [25, 25, 112],
      mintcream: [245, 255, 250],
      mistyrose: [255, 228, 225],
      moccasin: [255, 228, 181],
      navajowhite: [255, 222, 173],
      navy: [0, 0, 128],
      oldlace: [253, 245, 230],
      olive: [128, 128, 0],
      olivedrab: [107, 142, 35],
      orange: [255, 165, 0],
      orangered: [255, 69, 0],
      orchid: [218, 112, 214],
      palegoldenrod: [238, 232, 170],
      palegreen: [152, 251, 152],
      paleturquoise: [175, 238, 238],
      palevioletred: [219, 112, 147],
      papayawhip: [255, 239, 213],
      peachpuff: [255, 218, 185],
      peru: [205, 133, 63],
      pink: [255, 192, 203],
      plum: [221, 160, 221],
      powderblue: [176, 224, 230],
      purple: [128, 0, 128],
      rebeccapurple: [102, 51, 153],
      red: [255, 0, 0],
      rosybrown: [188, 143, 143],
      royalblue: [65, 105, 225],
      saddlebrown: [139, 69, 19],
      salmon: [250, 128, 114],
      sandybrown: [244, 164, 96],
      seagreen: [46, 139, 87],
      seashell: [255, 245, 238],
      sienna: [160, 82, 45],
      silver: [192, 192, 192],
      skyblue: [135, 206, 235],
      slateblue: [106, 90, 205],
      slategray: [112, 128, 144],
      slategrey: [112, 128, 144],
      snow: [255, 250, 250],
      springgreen: [0, 255, 127],
      steelblue: [70, 130, 180],
      tan: [210, 180, 140],
      teal: [0, 128, 128],
      thistle: [216, 191, 216],
      tomato: [255, 99, 71],
      turquoise: [64, 224, 208],
      violet: [238, 130, 238],
      wheat: [245, 222, 179],
      white: [255, 255, 255],
      whitesmoke: [245, 245, 245],
      yellow: [255, 255, 0],
      yellowgreen: [154, 205, 50]
    };
  
    var reverseKeywords = {};
    for (var key in cssKeywords) {
      reverseKeywords[JSON.stringify(cssKeywords[key])] = key;
    }
  
    var convert = function () {
      return new Converter();
    };
  
    for (var func in conversions) {
      // export Raw versions
      convert[func + "Raw"] = (function (func) {
        // accept array or plain args
        return function (arg) {
          if (typeof arg == "number")
            arg = Array.prototype.slice.call(arguments);
          return conversions[func](arg);
        }
      })(func);
  
      var pair = /(\w+)2(\w+)/.exec(func),
          from = pair[1],
          to = pair[2];
  
      // export rgb2hsl and ["rgb"]["hsl"]
      convert[from] = convert[from] || {};
  
      convert[from][to] = convert[func] = (function (func) {
        return function (arg) {
          if (typeof arg == "number")
            arg = Array.prototype.slice.call(arguments);
  
          var val = conversions[func](arg);
          if (typeof val == "string" || val === undefined)
            return val; // keyword
  
          for (var i = 0; i < val.length; i++)
            val[i] = Math.round(val[i]);
          return val;
        }
      })(func);
    }
  
  
    /* Converter does lazy conversion and caching */
    var Converter = function () {
      this.convs = {};
    };
  
    /* Either get the values for a space or
    set the values for a space, depending on args */
    Converter.prototype.routeSpace = function (space, args) {
      var values = args[0];
      if (values === undefined) {
        // color.rgb()
        return this.getValues(space);
      }
      // color.rgb(10, 10, 10)
      if (typeof values == "number") {
        values = Array.prototype.slice.call(args);
      }
  
      return this.setValues(space, values);
    };
  
    /* Set the values for a space, invalidating cache */
    Converter.prototype.setValues = function (space, values) {
      this.space = space;
      this.convs = {};
      this.convs[space] = values;
      return this;
    };
  
    /* Get the values for a space. If there's already
    a conversion for the space, fetch it, otherwise
    compute it */
    Converter.prototype.getValues = function (space) {
      var vals = this.convs[space];
      if (!vals) {
        var fspace = this.space,
            from = this.convs[fspace];
        vals = convert[fspace][space](from);
  
        this.convs[space] = vals;
      }
      return vals;
    };
  
    ["rgb", "hsl", "hsv", "cmyk", "keyword"].forEach(function (space) {
      Converter.prototype[space] = function (vals) {
        return this.routeSpace(space, arguments);
      };
    });
  
    var colorConvert = convert;
  
    var colorName = {
      "aliceblue": [240, 248, 255],
      "antiquewhite": [250, 235, 215],
      "aqua": [0, 255, 255],
      "aquamarine": [127, 255, 212],
      "azure": [240, 255, 255],
      "beige": [245, 245, 220],
      "bisque": [255, 228, 196],
      "black": [0, 0, 0],
      "blanchedalmond": [255, 235, 205],
      "blue": [0, 0, 255],
      "blueviolet": [138, 43, 226],
      "brown": [165, 42, 42],
      "burlywood": [222, 184, 135],
      "cadetblue": [95, 158, 160],
      "chartreuse": [127, 255, 0],
      "chocolate": [210, 105, 30],
      "coral": [255, 127, 80],
      "cornflowerblue": [100, 149, 237],
      "cornsilk": [255, 248, 220],
      "crimson": [220, 20, 60],
      "cyan": [0, 255, 255],
      "darkblue": [0, 0, 139],
      "darkcyan": [0, 139, 139],
      "darkgoldenrod": [184, 134, 11],
      "darkgray": [169, 169, 169],
      "darkgreen": [0, 100, 0],
      "darkgrey": [169, 169, 169],
      "darkkhaki": [189, 183, 107],
      "darkmagenta": [139, 0, 139],
      "darkolivegreen": [85, 107, 47],
      "darkorange": [255, 140, 0],
      "darkorchid": [153, 50, 204],
      "darkred": [139, 0, 0],
      "darksalmon": [233, 150, 122],
      "darkseagreen": [143, 188, 143],
      "darkslateblue": [72, 61, 139],
      "darkslategray": [47, 79, 79],
      "darkslategrey": [47, 79, 79],
      "darkturquoise": [0, 206, 209],
      "darkviolet": [148, 0, 211],
      "deeppink": [255, 20, 147],
      "deepskyblue": [0, 191, 255],
      "dimgray": [105, 105, 105],
      "dimgrey": [105, 105, 105],
      "dodgerblue": [30, 144, 255],
      "firebrick": [178, 34, 34],
      "floralwhite": [255, 250, 240],
      "forestgreen": [34, 139, 34],
      "fuchsia": [255, 0, 255],
      "gainsboro": [220, 220, 220],
      "ghostwhite": [248, 248, 255],
      "gold": [255, 215, 0],
      "goldenrod": [218, 165, 32],
      "gray": [128, 128, 128],
      "green": [0, 128, 0],
      "greenyellow": [173, 255, 47],
      "grey": [128, 128, 128],
      "honeydew": [240, 255, 240],
      "hotpink": [255, 105, 180],
      "indianred": [205, 92, 92],
      "indigo": [75, 0, 130],
      "ivory": [255, 255, 240],
      "khaki": [240, 230, 140],
      "lavender": [230, 230, 250],
      "lavenderblush": [255, 240, 245],
      "lawngreen": [124, 252, 0],
      "lemonchiffon": [255, 250, 205],
      "lightblue": [173, 216, 230],
      "lightcoral": [240, 128, 128],
      "lightcyan": [224, 255, 255],
      "lightgoldenrodyellow": [250, 250, 210],
      "lightgray": [211, 211, 211],
      "lightgreen": [144, 238, 144],
      "lightgrey": [211, 211, 211],
      "lightpink": [255, 182, 193],
      "lightsalmon": [255, 160, 122],
      "lightseagreen": [32, 178, 170],
      "lightskyblue": [135, 206, 250],
      "lightslategray": [119, 136, 153],
      "lightslategrey": [119, 136, 153],
      "lightsteelblue": [176, 196, 222],
      "lightyellow": [255, 255, 224],
      "lime": [0, 255, 0],
      "limegreen": [50, 205, 50],
      "linen": [250, 240, 230],
      "magenta": [255, 0, 255],
      "maroon": [128, 0, 0],
      "mediumaquamarine": [102, 205, 170],
      "mediumblue": [0, 0, 205],
      "mediumorchid": [186, 85, 211],
      "mediumpurple": [147, 112, 219],
      "mediumseagreen": [60, 179, 113],
      "mediumslateblue": [123, 104, 238],
      "mediumspringgreen": [0, 250, 154],
      "mediumturquoise": [72, 209, 204],
      "mediumvioletred": [199, 21, 133],
      "midnightblue": [25, 25, 112],
      "mintcream": [245, 255, 250],
      "mistyrose": [255, 228, 225],
      "moccasin": [255, 228, 181],
      "navajowhite": [255, 222, 173],
      "navy": [0, 0, 128],
      "oldlace": [253, 245, 230],
      "olive": [128, 128, 0],
      "olivedrab": [107, 142, 35],
      "orange": [255, 165, 0],
      "orangered": [255, 69, 0],
      "orchid": [218, 112, 214],
      "palegoldenrod": [238, 232, 170],
      "palegreen": [152, 251, 152],
      "paleturquoise": [175, 238, 238],
      "palevioletred": [219, 112, 147],
      "papayawhip": [255, 239, 213],
      "peachpuff": [255, 218, 185],
      "peru": [205, 133, 63],
      "pink": [255, 192, 203],
      "plum": [221, 160, 221],
      "powderblue": [176, 224, 230],
      "purple": [128, 0, 128],
      "rebeccapurple": [102, 51, 153],
      "red": [255, 0, 0],
      "rosybrown": [188, 143, 143],
      "royalblue": [65, 105, 225],
      "saddlebrown": [139, 69, 19],
      "salmon": [250, 128, 114],
      "sandybrown": [244, 164, 96],
      "seagreen": [46, 139, 87],
      "seashell": [255, 245, 238],
      "sienna": [160, 82, 45],
      "silver": [192, 192, 192],
      "skyblue": [135, 206, 235],
      "slateblue": [106, 90, 205],
      "slategray": [112, 128, 144],
      "slategrey": [112, 128, 144],
      "snow": [255, 250, 250],
      "springgreen": [0, 255, 127],
      "steelblue": [70, 130, 180],
      "tan": [210, 180, 140],
      "teal": [0, 128, 128],
      "thistle": [216, 191, 216],
      "tomato": [255, 99, 71],
      "turquoise": [64, 224, 208],
      "violet": [238, 130, 238],
      "wheat": [245, 222, 179],
      "white": [255, 255, 255],
      "whitesmoke": [245, 245, 245],
      "yellow": [255, 255, 0],
      "yellowgreen": [154, 205, 50]
    };
  
    /* MIT license */
  
  
    var colorString = {
      getRgba: getRgba,
      getHsla: getHsla,
      getRgb: getRgb,
      getHsl: getHsl,
      getHwb: getHwb,
      getAlpha: getAlpha,
  
      hexString: hexString,
      rgbString: rgbString,
      rgbaString: rgbaString,
      percentString: percentString,
      percentaString: percentaString,
      hslString: hslString,
      hslaString: hslaString,
      hwbString: hwbString,
      keyword: keyword
    };
  
    function getRgba(string) {
      if (!string) {
        return;
      }
      var abbr = /^#([a-fA-F0-9]{3,4})$/i,
          hex = /^#([a-fA-F0-9]{6}([a-fA-F0-9]{2})?)$/i,
          rgba = /^rgba?\(\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
          per = /^rgba?\(\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
          keyword = /(\w+)/;
  
      var rgb = [0, 0, 0],
          a = 1,
          match = string.match(abbr),
          hexAlpha = "";
      if (match) {
        match = match[1];
        hexAlpha = match[3];
        for (var i = 0; i < rgb.length; i++) {
          rgb[i] = parseInt(match[i] + match[i], 16);
        }
        if (hexAlpha) {
          a = Math.round((parseInt(hexAlpha + hexAlpha, 16) / 255) * 100) / 100;
        }
      } else if (match = string.match(hex)) {
        hexAlpha = match[2];
        match = match[1];
        for (var i = 0; i < rgb.length; i++) {
          rgb[i] = parseInt(match.slice(i * 2, i * 2 + 2), 16);
        }
        if (hexAlpha) {
          a = Math.round((parseInt(hexAlpha, 16) / 255) * 100) / 100;
        }
      } else if (match = string.match(rgba)) {
        for (var i = 0; i < rgb.length; i++) {
          rgb[i] = parseInt(match[i + 1]);
        }
        a = parseFloat(match[4]);
      } else if (match = string.match(per)) {
        for (var i = 0; i < rgb.length; i++) {
          rgb[i] = Math.round(parseFloat(match[i + 1]) * 2.55);
        }
        a = parseFloat(match[4]);
      } else if (match = string.match(keyword)) {
        if (match[1] == "transparent") {
          return [0, 0, 0, 0];
        }
        rgb = colorName[match[1]];
        if (!rgb) {
          return;
        }
      }
  
      for (var i = 0; i < rgb.length; i++) {
        rgb[i] = scale(rgb[i], 0, 255);
      }
      if (!a && a != 0) {
        a = 1;
      } else {
        a = scale(a, 0, 1);
      }
      rgb[3] = a;
      return rgb;
    }
  
    function getHsla(string) {
      if (!string) {
        return;
      }
      var hsl = /^hsla?\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
      var match = string.match(hsl);
      if (match) {
        var alpha = parseFloat(match[4]);
        var h = scale(parseInt(match[1]), 0, 360),
            s = scale(parseFloat(match[2]), 0, 100),
            l = scale(parseFloat(match[3]), 0, 100),
            a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
        return [h, s, l, a];
      }
    }
  
    function getHwb(string) {
      if (!string) {
        return;
      }
      var hwb = /^hwb\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
      var match = string.match(hwb);
      if (match) {
        var alpha = parseFloat(match[4]);
        var h = scale(parseInt(match[1]), 0, 360),
            w = scale(parseFloat(match[2]), 0, 100),
            b = scale(parseFloat(match[3]), 0, 100),
            a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
        return [h, w, b, a];
      }
    }
  
    function getRgb(string) {
      var rgba = getRgba(string);
      return rgba && rgba.slice(0, 3);
    }
  
    function getHsl(string) {
      var hsla = getHsla(string);
      return hsla && hsla.slice(0, 3);
    }
  
    function getAlpha(string) {
      var vals = getRgba(string);
      if (vals) {
        return vals[3];
      } else if (vals = getHsla(string)) {
        return vals[3];
      } else if (vals = getHwb(string)) {
        return vals[3];
      }
    }
  
  // generators
    function hexString(rgba, a) {
      var a = (a !== undefined && rgba.length === 3) ? a : rgba[3];
      return "#" + hexDouble(rgba[0])
          + hexDouble(rgba[1])
          + hexDouble(rgba[2])
          + (
              (a >= 0 && a < 1)
                  ? hexDouble(Math.round(a * 255))
                  : ""
          );
    }
  
    function rgbString(rgba, alpha) {
      if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
        return rgbaString(rgba, alpha);
      }
      return "rgb(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2] + ")";
    }
  
    function rgbaString(rgba, alpha) {
      if (alpha === undefined) {
        alpha = (rgba[3] !== undefined ? rgba[3] : 1);
      }
      return "rgba(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2]
          + ", " + alpha + ")";
    }
  
    function percentString(rgba, alpha) {
      if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
        return percentaString(rgba, alpha);
      }
      var r = Math.round(rgba[0] / 255 * 100),
          g = Math.round(rgba[1] / 255 * 100),
          b = Math.round(rgba[2] / 255 * 100);
  
      return "rgb(" + r + "%, " + g + "%, " + b + "%)";
    }
  
    function percentaString(rgba, alpha) {
      var r = Math.round(rgba[0] / 255 * 100),
          g = Math.round(rgba[1] / 255 * 100),
          b = Math.round(rgba[2] / 255 * 100);
      return "rgba(" + r + "%, " + g + "%, " + b + "%, " + (alpha || rgba[3] || 1) + ")";
    }
  
    function hslString(hsla, alpha) {
      if (alpha < 1 || (hsla[3] && hsla[3] < 1)) {
        return hslaString(hsla, alpha);
      }
      return "hsl(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%)";
    }
  
    function hslaString(hsla, alpha) {
      if (alpha === undefined) {
        alpha = (hsla[3] !== undefined ? hsla[3] : 1);
      }
      return "hsla(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%, "
          + alpha + ")";
    }
  
  // hwb is a bit different than rgb(a) & hsl(a) since there is no alpha specific syntax
  // (hwb have alpha optional & 1 is default value)
    function hwbString(hwb, alpha) {
      if (alpha === undefined) {
        alpha = (hwb[3] !== undefined ? hwb[3] : 1);
      }
      return "hwb(" + hwb[0] + ", " + hwb[1] + "%, " + hwb[2] + "%"
          + (alpha !== undefined && alpha !== 1 ? ", " + alpha : "") + ")";
    }
  
    function keyword(rgb) {
      return reverseNames[rgb.slice(0, 3)];
    }
  
  // helpers
    function scale(num, min, max) {
      return Math.min(Math.max(min, num), max);
    }
  
    function hexDouble(num) {
      var str = num.toString(16).toUpperCase();
      return (str.length < 2) ? "0" + str : str;
    }
  
  
  //create a list of reverse color names
    var reverseNames = {};
    for (var name in colorName) {
      reverseNames[colorName[name]] = name;
    }
  
    /* MIT license */
  
  
    var Color = function (obj) {
      if (obj instanceof Color) {
        return obj;
      }
      if (!(this instanceof Color)) {
        return new Color(obj);
      }
  
      this.valid = false;
      this.values = {
        rgb: [0, 0, 0],
        hsl: [0, 0, 0],
        hsv: [0, 0, 0],
        hwb: [0, 0, 0],
        cmyk: [0, 0, 0, 0],
        alpha: 1
      };
  
      // parse Color() argument
      var vals;
      if (typeof obj === 'string') {
        vals = colorString.getRgba(obj);
        if (vals) {
          this.setValues('rgb', vals);
        } else if (vals = colorString.getHsla(obj)) {
          this.setValues('hsl', vals);
        } else if (vals = colorString.getHwb(obj)) {
          this.setValues('hwb', vals);
        }
      } else if (typeof obj === 'object') {
        vals = obj;
        if (vals.r !== undefined || vals.red !== undefined) {
          this.setValues('rgb', vals);
        } else if (vals.l !== undefined || vals.lightness !== undefined) {
          this.setValues('hsl', vals);
        } else if (vals.v !== undefined || vals.value !== undefined) {
          this.setValues('hsv', vals);
        } else if (vals.w !== undefined || vals.whiteness !== undefined) {
          this.setValues('hwb', vals);
        } else if (vals.c !== undefined || vals.cyan !== undefined) {
          this.setValues('cmyk', vals);
        }
      }
    };
  
    Color.prototype = {
      isValid: function () {
        return this.valid;
      },
      rgb: function () {
        return this.setSpace('rgb', arguments);
      },
      hsl: function () {
        return this.setSpace('hsl', arguments);
      },
      hsv: function () {
        return this.setSpace('hsv', arguments);
      },
      hwb: function () {
        return this.setSpace('hwb', arguments);
      },
      cmyk: function () {
        return this.setSpace('cmyk', arguments);
      },
  
      rgbArray: function () {
        return this.values.rgb;
      },
      hslArray: function () {
        return this.values.hsl;
      },
      hsvArray: function () {
        return this.values.hsv;
      },
      hwbArray: function () {
        var values = this.values;
        if (values.alpha !== 1) {
          return values.hwb.concat([values.alpha]);
        }
        return values.hwb;
      },
      cmykArray: function () {
        return this.values.cmyk;
      },
      rgbaArray: function () {
        var values = this.values;
        return values.rgb.concat([values.alpha]);
      },
      hslaArray: function () {
        var values = this.values;
        return values.hsl.concat([values.alpha]);
      },
      alpha: function (val) {
        if (val === undefined) {
          return this.values.alpha;
        }
        this.setValues('alpha', val);
        return this;
      },
  
      red: function (val) {
        return this.setChannel('rgb', 0, val);
      },
      green: function (val) {
        return this.setChannel('rgb', 1, val);
      },
      blue: function (val) {
        return this.setChannel('rgb', 2, val);
      },
      hue: function (val) {
        if (val) {
          val %= 360;
          val = val < 0 ? 360 + val : val;
        }
        return this.setChannel('hsl', 0, val);
      },
      saturation: function (val) {
        return this.setChannel('hsl', 1, val);
      },
      lightness: function (val) {
        return this.setChannel('hsl', 2, val);
      },
      saturationv: function (val) {
        return this.setChannel('hsv', 1, val);
      },
      whiteness: function (val) {
        return this.setChannel('hwb', 1, val);
      },
      blackness: function (val) {
        return this.setChannel('hwb', 2, val);
      },
      value: function (val) {
        return this.setChannel('hsv', 2, val);
      },
      cyan: function (val) {
        return this.setChannel('cmyk', 0, val);
      },
      magenta: function (val) {
        return this.setChannel('cmyk', 1, val);
      },
      yellow: function (val) {
        return this.setChannel('cmyk', 2, val);
      },
      black: function (val) {
        return this.setChannel('cmyk', 3, val);
      },
  
      hexString: function () {
        return colorString.hexString(this.values.rgb);
      },
      rgbString: function () {
        return colorString.rgbString(this.values.rgb, this.values.alpha);
      },
      rgbaString: function () {
        return colorString.rgbaString(this.values.rgb, this.values.alpha);
      },
      percentString: function () {
        return colorString.percentString(this.values.rgb, this.values.alpha);
      },
      hslString: function () {
        return colorString.hslString(this.values.hsl, this.values.alpha);
      },
      hslaString: function () {
        return colorString.hslaString(this.values.hsl, this.values.alpha);
      },
      hwbString: function () {
        return colorString.hwbString(this.values.hwb, this.values.alpha);
      },
      keyword: function () {
        return colorString.keyword(this.values.rgb, this.values.alpha);
      },
  
      rgbNumber: function () {
        var rgb = this.values.rgb;
        return (rgb[0] << 16) | (rgb[1] << 8) | rgb[2];
      },
  
      luminosity: function () {
        // http://www.w3.org/TR/WCAG20/#relativeluminancedef
        var rgb = this.values.rgb;
        var lum = [];
        for (var i = 0; i < rgb.length; i++) {
          var chan = rgb[i] / 255;
          lum[i] = (chan <= 0.03928) ? chan / 12.92 : Math.pow(((chan + 0.055) / 1.055), 2.4);
        }
        return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];
      },
  
      contrast: function (color2) {
        // http://www.w3.org/TR/WCAG20/#contrast-ratiodef
        var lum1 = this.luminosity();
        var lum2 = color2.luminosity();
        if (lum1 > lum2) {
          return (lum1 + 0.05) / (lum2 + 0.05);
        }
        return (lum2 + 0.05) / (lum1 + 0.05);
      },
  
      level: function (color2) {
        var contrastRatio = this.contrast(color2);
        if (contrastRatio >= 7.1) {
          return 'AAA';
        }
  
        return (contrastRatio >= 4.5) ? 'AA' : '';
      },
  
      dark: function () {
        // YIQ equation from http://24ways.org/2010/calculating-color-contrast
        var rgb = this.values.rgb;
        var yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
        return yiq < 128;
      },
  
      light: function () {
        return !this.dark();
      },
  
      negate: function () {
        var rgb = [];
        for (var i = 0; i < 3; i++) {
          rgb[i] = 255 - this.values.rgb[i];
        }
        this.setValues('rgb', rgb);
        return this;
      },
  
      lighten: function (ratio) {
        var hsl = this.values.hsl;
        hsl[2] += hsl[2] * ratio;
        this.setValues('hsl', hsl);
        return this;
      },
  
      darken: function (ratio) {
        var hsl = this.values.hsl;
        hsl[2] -= hsl[2] * ratio;
        this.setValues('hsl', hsl);
        return this;
      },
  
      saturate: function (ratio) {
        var hsl = this.values.hsl;
        hsl[1] += hsl[1] * ratio;
        this.setValues('hsl', hsl);
        return this;
      },
  
      desaturate: function (ratio) {
        var hsl = this.values.hsl;
        hsl[1] -= hsl[1] * ratio;
        this.setValues('hsl', hsl);
        return this;
      },
  
      whiten: function (ratio) {
        var hwb = this.values.hwb;
        hwb[1] += hwb[1] * ratio;
        this.setValues('hwb', hwb);
        return this;
      },
  
      blacken: function (ratio) {
        var hwb = this.values.hwb;
        hwb[2] += hwb[2] * ratio;
        this.setValues('hwb', hwb);
        return this;
      },
  
      greyscale: function () {
        var rgb = this.values.rgb;
        // http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
        var val = rgb[0] * 0.3 + rgb[1] * 0.59 + rgb[2] * 0.11;
        this.setValues('rgb', [val, val, val]);
        return this;
      },
  
      clearer: function (ratio) {
        var alpha = this.values.alpha;
        this.setValues('alpha', alpha - (alpha * ratio));
        return this;
      },
  
      opaquer: function (ratio) {
        var alpha = this.values.alpha;
        this.setValues('alpha', alpha + (alpha * ratio));
        return this;
      },
  
      rotate: function (degrees) {
        var hsl = this.values.hsl;
        var hue = (hsl[0] + degrees) % 360;
        hsl[0] = hue < 0 ? 360 + hue : hue;
        this.setValues('hsl', hsl);
        return this;
      },
  
      /**
       * Ported from sass implementation in C
       * https://github.com/sass/libsass/blob/0e6b4a2850092356aa3ece07c6b249f0221caced/functions.cpp#L209
       */
      mix: function (mixinColor, weight) {
        var color1 = this;
        var color2 = mixinColor;
        var p = weight === undefined ? 0.5 : weight;
  
        var w = 2 * p - 1;
        var a = color1.alpha() - color2.alpha();
  
        var w1 = (((w * a === -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
        var w2 = 1 - w1;
  
        return this
            .rgb(
                w1 * color1.red() + w2 * color2.red(),
                w1 * color1.green() + w2 * color2.green(),
                w1 * color1.blue() + w2 * color2.blue()
            )
            .alpha(color1.alpha() * p + color2.alpha() * (1 - p));
      },
  
      toJSON: function () {
        return this.rgb();
      },
  
      clone: function () {
        // NOTE(SB): using node-clone creates a dependency to Buffer when using browserify,
        // making the final build way to big to embed in Chart.js. So let's do it manually,
        // assuming that values to clone are 1 dimension arrays containing only numbers,
        // except 'alpha' which is a number.
        var result = new Color();
        var source = this.values;
        var target = result.values;
        var value, type;
  
        for (var prop in source) {
          if (source.hasOwnProperty(prop)) {
            value = source[prop];
            type = ({}).toString.call(value);
            if (type === '[object Array]') {
              target[prop] = value.slice(0);
            } else if (type === '[object Number]') {
              target[prop] = value;
            } else {
              console.error('unexpected color value:', value);
            }
          }
        }
  
        return result;
      }
    };
  
    Color.prototype.spaces = {
      rgb: ['red', 'green', 'blue'],
      hsl: ['hue', 'saturation', 'lightness'],
      hsv: ['hue', 'saturation', 'value'],
      hwb: ['hue', 'whiteness', 'blackness'],
      cmyk: ['cyan', 'magenta', 'yellow', 'black']
    };
  
    Color.prototype.maxes = {
      rgb: [255, 255, 255],
      hsl: [360, 100, 100],
      hsv: [360, 100, 100],
      hwb: [360, 100, 100],
      cmyk: [100, 100, 100, 100]
    };
  
    Color.prototype.getValues = function (space) {
      var values = this.values;
      var vals = {};
  
      for (var i = 0; i < space.length; i++) {
        vals[space.charAt(i)] = values[space][i];
      }
  
      if (values.alpha !== 1) {
        vals.a = values.alpha;
      }
  
      // {r: 255, g: 255, b: 255, a: 0.4}
      return vals;
    };
  
    Color.prototype.setValues = function (space, vals) {
      var values = this.values;
      var spaces = this.spaces;
      var maxes = this.maxes;
      var alpha = 1;
      var i;
  
      this.valid = true;
  
      if (space === 'alpha') {
        alpha = vals;
      } else if (vals.length) {
        // [10, 10, 10]
        values[space] = vals.slice(0, space.length);
        alpha = vals[space.length];
      } else if (vals[space.charAt(0)] !== undefined) {
        // {r: 10, g: 10, b: 10}
        for (i = 0; i < space.length; i++) {
          values[space][i] = vals[space.charAt(i)];
        }
  
        alpha = vals.a;
      } else if (vals[spaces[space][0]] !== undefined) {
        // {red: 10, green: 10, blue: 10}
        var chans = spaces[space];
  
        for (i = 0; i < space.length; i++) {
          values[space][i] = vals[chans[i]];
        }
  
        alpha = vals.alpha;
      }
  
      values.alpha = Math.max(0, Math.min(1, (alpha === undefined ? values.alpha : alpha)));
  
      if (space === 'alpha') {
        return false;
      }
  
      var capped;
  
      // cap values of the space prior converting all values
      for (i = 0; i < space.length; i++) {
        capped = Math.max(0, Math.min(maxes[space][i], values[space][i]));
        values[space][i] = Math.round(capped);
      }
  
      // convert to all the other color spaces
      for (var sname in spaces) {
        if (sname !== space) {
          values[sname] = colorConvert[space][sname](values[space]);
        }
      }
  
      return true;
    };
  
    Color.prototype.setSpace = function (space, args) {
      var vals = args[0];
  
      if (vals === undefined) {
        // color.rgb()
        return this.getValues(space);
      }
  
      // color.rgb(10, 10, 10)
      if (typeof vals === 'number') {
        vals = Array.prototype.slice.call(args);
      }
  
      this.setValues(space, vals);
      return this;
    };
  
    Color.prototype.setChannel = function (space, index, val) {
      var svalues = this.values[space];
      if (val === undefined) {
        // color.red()
        return svalues[index];
      } else if (val === svalues[index]) {
        // color.red(color.red())
        return this;
      }
  
      // color.red(100)
      svalues[index] = val;
      this.setValues(space, svalues);
  
      return this;
    };
  
    if (typeof window !== 'undefined') {
      window.Color = Color;
    }
  
    var chartjsColor = Color;
  
    /**
     * @namespace Chart.helpers
     */
    var helpers = {
      /**
       * An empty function that can be used, for example, for optional callback.
       */
      noop: function () {
      },
  
      /**
       * Returns a unique id, sequentially generated from a global variable.
       * @returns {number}
       * @function
       */
      uid: (function () {
        var id = 0;
        return function () {
          return id++;
        };
      }()),
  
      /**
       * Returns true if `value` is neither null nor undefined, else returns false.
       * @param {*} value - The value to test.
       * @returns {boolean}
       * @since 2.7.0
       */
      isNullOrUndef: function (value) {
        return value === null || typeof value === 'undefined';
      },
  
      /**
       * Returns true if `value` is an array (including typed arrays), else returns false.
       * @param {*} value - The value to test.
       * @returns {boolean}
       * @function
       */
      isArray: function (value) {
        if (Array.isArray && Array.isArray(value)) {
          return true;
        }
        var type = Object.prototype.toString.call(value);
        if (type.substr(0, 7) === '[object' && type.substr(-6) === 'Array]') {
          return true;
        }
        return false;
      },
  
      /**
       * Returns true if `value` is an object (excluding null), else returns false.
       * @param {*} value - The value to test.
       * @returns {boolean}
       * @since 2.7.0
       */
      isObject: function (value) {
        return value !== null && Object.prototype.toString.call(value) === '[object Object]';
      },
  
      /**
       * Returns true if `value` is a finite number, else returns false
       * @param {*} value  - The value to test.
       * @returns {boolean}
       */
      isFinite: function (value) {
        return (typeof value === 'number' || value instanceof Number) && isFinite(value);
      },
  
      /**
       * Returns `value` if defined, else returns `defaultValue`.
       * @param {*} value - The value to return if defined.
       * @param {*} defaultValue - The value to return if `value` is undefined.
       * @returns {*}
       */
      valueOrDefault: function (value, defaultValue) {
        return typeof value === 'undefined' ? defaultValue : value;
      },
  
      /**
       * Returns value at the given `index` in array if defined, else returns `defaultValue`.
       * @param {Array} value - The array to lookup for value at `index`.
       * @param {number} index - The index in `value` to lookup for value.
       * @param {*} defaultValue - The value to return if `value[index]` is undefined.
       * @returns {*}
       */
      valueAtIndexOrDefault: function (value, index, defaultValue) {
        return helpers.valueOrDefault(helpers.isArray(value) ? value[index] : value, defaultValue);
      },
  
      /**
       * Calls `fn` with the given `args` in the scope defined by `thisArg` and returns the
       * value returned by `fn`. If `fn` is not a function, this method returns undefined.
       * @param {function} fn - The function to call.
       * @param {Array|undefined|null} args - The arguments with which `fn` should be called.
       * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
       * @returns {*}
       */
      callback: function (fn, args, thisArg) {
        if (fn && typeof fn.call === 'function') {
          return fn.apply(thisArg, args);
        }
      },
  
      /**
       * Note(SB) for performance sake, this method should only be used when loopable type
       * is unknown or in none intensive code (not called often and small loopable). Else
       * it's preferable to use a regular for() loop and save extra function calls.
       * @param {object|Array} loopable - The object or array to be iterated.
       * @param {function} fn - The function to call for each item.
       * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
       * @param {boolean} [reverse] - If true, iterates backward on the loopable.
       */
      each: function (loopable, fn, thisArg, reverse) {
        var i, len, keys;
        if (helpers.isArray(loopable)) {
          len = loopable.length;
          if (reverse) {
            for (i = len - 1; i >= 0; i--) {
              fn.call(thisArg, loopable[i], i);
            }
          } else {
            for (i = 0; i < len; i++) {
              fn.call(thisArg, loopable[i], i);
            }
          }
        } else if (helpers.isObject(loopable)) {
          keys = Object.keys(loopable);
          len = keys.length;
          for (i = 0; i < len; i++) {
            fn.call(thisArg, loopable[keys[i]], keys[i]);
          }
        }
      },
  
      /**
       * Returns true if the `a0` and `a1` arrays have the same content, else returns false.
       * @see https://stackoverflow.com/a/14853974
       * @param {Array} a0 - The array to compare
       * @param {Array} a1 - The array to compare
       * @returns {boolean}
       */
      arrayEquals: function (a0, a1) {
        var i, ilen, v0, v1;
  
        if (!a0 || !a1 || a0.length !== a1.length) {
          return false;
        }
  
        for (i = 0, ilen = a0.length; i < ilen; ++i) {
          v0 = a0[i];
          v1 = a1[i];
  
          if (v0 instanceof Array && v1 instanceof Array) {
            if (!helpers.arrayEquals(v0, v1)) {
              return false;
            }
          } else if (v0 !== v1) {
            // NOTE: two different object instances will never be equal: {x:20} != {x:20}
            return false;
          }
        }
  
        return true;
      },
  
      /**
       * Returns a deep copy of `source` without keeping references on objects and arrays.
       * @param {*} source - The value to clone.
       * @returns {*}
       */
      clone: function (source) {
        if (helpers.isArray(source)) {
          return source.map(helpers.clone);
        }
  
        if (helpers.isObject(source)) {
          var target = {};
          var keys = Object.keys(source);
          var klen = keys.length;
          var k = 0;
  
          for (; k < klen; ++k) {
            target[keys[k]] = helpers.clone(source[keys[k]]);
          }
  
          return target;
        }
  
        return source;
      },
  
      /**
       * The default merger when Chart.helpers.merge is called without merger option.
       * Note(SB): also used by mergeConfig and mergeScaleConfig as fallback.
       * @private
       */
      _merger: function (key, target, source, options) {
        var tval = target[key];
        var sval = source[key];
  
        if (helpers.isObject(tval) && helpers.isObject(sval)) {
          helpers.merge(tval, sval, options);
        } else {
          target[key] = helpers.clone(sval);
        }
      },
  
      /**
       * Merges source[key] in target[key] only if target[key] is undefined.
       * @private
       */
      _mergerIf: function (key, target, source) {
        var tval = target[key];
        var sval = source[key];
  
        if (helpers.isObject(tval) && helpers.isObject(sval)) {
          helpers.mergeIf(tval, sval);
        } else if (!target.hasOwnProperty(key)) {
          target[key] = helpers.clone(sval);
        }
      },
  
      /**
       * Recursively deep copies `source` properties into `target` with the given `options`.
       * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
       * @param {object} target - The target object in which all sources are merged into.
       * @param {object|object[]} source - Object(s) to merge into `target`.
       * @param {object} [options] - Merging options:
       * @param {function} [options.merger] - The merge method (key, target, source, options)
       * @returns {object} The `target` object.
       */
      merge: function (target, source, options) {
        var sources = helpers.isArray(source) ? source : [source];
        var ilen = sources.length;
        var merge, i, keys, klen, k;
  
        if (!helpers.isObject(target)) {
          return target;
        }
  
        options = options || {};
        merge = options.merger || helpers._merger;
  
        for (i = 0; i < ilen; ++i) {
          source = sources[i];
          if (!helpers.isObject(source)) {
            continue;
          }
  
          keys = Object.keys(source);
          for (k = 0, klen = keys.length; k < klen; ++k) {
            merge(keys[k], target, source, options);
          }
        }
  
        return target;
      },
  
      /**
       * Recursively deep copies `source` properties into `target` *only* if not defined in target.
       * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
       * @param {object} target - The target object in which all sources are merged into.
       * @param {object|object[]} source - Object(s) to merge into `target`.
       * @returns {object} The `target` object.
       */
      mergeIf: function (target, source) {
        return helpers.merge(target, source, {merger: helpers._mergerIf});
      },
  
      /**
       * Applies the contents of two or more objects together into the first object.
       * @param {object} target - The target object in which all objects are merged into.
       * @param {object} arg1 - Object containing additional properties to merge in target.
       * @param {object} argN - Additional objects containing properties to merge in target.
       * @returns {object} The `target` object.
       */
      extend: function (target) {
        var setFn = function (value, key) {
          target[key] = value;
        };
        for (var i = 1, ilen = arguments.length; i < ilen; ++i) {
          helpers.each(arguments[i], setFn);
        }
        return target;
      },
  
      /**
       * Basic javascript inheritance based on the model created in Backbone.js
       */
      inherits: function (extensions) {
        var me = this;
        var ChartElement = (extensions && extensions.hasOwnProperty('constructor')) ? extensions.constructor : function () {
          return me.apply(this, arguments);
        };
  
        var Surrogate = function () {
          this.constructor = ChartElement;
        };
  
        Surrogate.prototype = me.prototype;
        ChartElement.prototype = new Surrogate();
        ChartElement.extend = helpers.inherits;
  
        if (extensions) {
          helpers.extend(ChartElement.prototype, extensions);
        }
  
        ChartElement.__super__ = me.prototype;
        return ChartElement;
      }
    };
  
    var helpers_core = helpers;
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use Chart.helpers.callback instead.
     * @function Chart.helpers.callCallback
     * @deprecated since version 2.6.0
     * @todo remove at version 3
     * @private
     */
    helpers.callCallback = helpers.callback;
  
    /**
     * Provided for backward compatibility, use Array.prototype.indexOf instead.
     * Array.prototype.indexOf compatibility: Chrome, Opera, Safari, FF1.5+, IE9+
     * @function Chart.helpers.indexOf
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers.indexOf = function (array, item, fromIndex) {
      return Array.prototype.indexOf.call(array, item, fromIndex);
    };
  
    /**
     * Provided for backward compatibility, use Chart.helpers.valueOrDefault instead.
     * @function Chart.helpers.getValueOrDefault
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers.getValueOrDefault = helpers.valueOrDefault;
  
    /**
     * Provided for backward compatibility, use Chart.helpers.valueAtIndexOrDefault instead.
     * @function Chart.helpers.getValueAtIndexOrDefault
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers.getValueAtIndexOrDefault = helpers.valueAtIndexOrDefault;
  
    /**
     * Easing functions adapted from Robert Penner's easing equations.
     * @namespace Chart.helpers.easingEffects
     * @see http://www.robertpenner.com/easing/
     */
    var effects = {
      linear: function (t) {
        return t;
      },
  
      easeInQuad: function (t) {
        return t * t;
      },
  
      easeOutQuad: function (t) {
        return -t * (t - 2);
      },
  
      easeInOutQuad: function (t) {
        if ((t /= 0.5) < 1) {
          return 0.5 * t * t;
        }
        return -0.5 * ((--t) * (t - 2) - 1);
      },
  
      easeInCubic: function (t) {
        return t * t * t;
      },
  
      easeOutCubic: function (t) {
        return (t = t - 1) * t * t + 1;
      },
  
      easeInOutCubic: function (t) {
        if ((t /= 0.5) < 1) {
          return 0.5 * t * t * t;
        }
        return 0.5 * ((t -= 2) * t * t + 2);
      },
  
      easeInQuart: function (t) {
        return t * t * t * t;
      },
  
      easeOutQuart: function (t) {
        return -((t = t - 1) * t * t * t - 1);
      },
  
      easeInOutQuart: function (t) {
        if ((t /= 0.5) < 1) {
          return 0.5 * t * t * t * t;
        }
        return -0.5 * ((t -= 2) * t * t * t - 2);
      },
  
      easeInQuint: function (t) {
        return t * t * t * t * t;
      },
  
      easeOutQuint: function (t) {
        return (t = t - 1) * t * t * t * t + 1;
      },
  
      easeInOutQuint: function (t) {
        if ((t /= 0.5) < 1) {
          return 0.5 * t * t * t * t * t;
        }
        return 0.5 * ((t -= 2) * t * t * t * t + 2);
      },
  
      easeInSine: function (t) {
        return -Math.cos(t * (Math.PI / 2)) + 1;
      },
  
      easeOutSine: function (t) {
        return Math.sin(t * (Math.PI / 2));
      },
  
      easeInOutSine: function (t) {
        return -0.5 * (Math.cos(Math.PI * t) - 1);
      },
  
      easeInExpo: function (t) {
        return (t === 0) ? 0 : Math.pow(2, 10 * (t - 1));
      },
  
      easeOutExpo: function (t) {
        return (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1;
      },
  
      easeInOutExpo: function (t) {
        if (t === 0) {
          return 0;
        }
        if (t === 1) {
          return 1;
        }
        if ((t /= 0.5) < 1) {
          return 0.5 * Math.pow(2, 10 * (t - 1));
        }
        return 0.5 * (-Math.pow(2, -10 * --t) + 2);
      },
  
      easeInCirc: function (t) {
        if (t >= 1) {
          return t;
        }
        return -(Math.sqrt(1 - t * t) - 1);
      },
  
      easeOutCirc: function (t) {
        return Math.sqrt(1 - (t = t - 1) * t);
      },
  
      easeInOutCirc: function (t) {
        if ((t /= 0.5) < 1) {
          return -0.5 * (Math.sqrt(1 - t * t) - 1);
        }
        return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
      },
  
      easeInElastic: function (t) {
        var s = 1.70158;
        var p = 0;
        var a = 1;
        if (t === 0) {
          return 0;
        }
        if (t === 1) {
          return 1;
        }
        if (!p) {
          p = 0.3;
        }
        if (a < 1) {
          a = 1;
          s = p / 4;
        } else {
          s = p / (2 * Math.PI) * Math.asin(1 / a);
        }
        return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
      },
  
      easeOutElastic: function (t) {
        var s = 1.70158;
        var p = 0;
        var a = 1;
        if (t === 0) {
          return 0;
        }
        if (t === 1) {
          return 1;
        }
        if (!p) {
          p = 0.3;
        }
        if (a < 1) {
          a = 1;
          s = p / 4;
        } else {
          s = p / (2 * Math.PI) * Math.asin(1 / a);
        }
        return a * Math.pow(2, -10 * t) * Math.sin((t - s) * (2 * Math.PI) / p) + 1;
      },
  
      easeInOutElastic: function (t) {
        var s = 1.70158;
        var p = 0;
        var a = 1;
        if (t === 0) {
          return 0;
        }
        if ((t /= 0.5) === 2) {
          return 1;
        }
        if (!p) {
          p = 0.45;
        }
        if (a < 1) {
          a = 1;
          s = p / 4;
        } else {
          s = p / (2 * Math.PI) * Math.asin(1 / a);
        }
        if (t < 1) {
          return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
        }
        return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p) * 0.5 + 1;
      },
      easeInBack: function (t) {
        var s = 1.70158;
        return t * t * ((s + 1) * t - s);
      },
  
      easeOutBack: function (t) {
        var s = 1.70158;
        return (t = t - 1) * t * ((s + 1) * t + s) + 1;
      },
  
      easeInOutBack: function (t) {
        var s = 1.70158;
        if ((t /= 0.5) < 1) {
          return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
        }
        return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
      },
  
      easeInBounce: function (t) {
        return 1 - effects.easeOutBounce(1 - t);
      },
  
      easeOutBounce: function (t) {
        if (t < (1 / 2.75)) {
          return 7.5625 * t * t;
        }
        if (t < (2 / 2.75)) {
          return 7.5625 * (t -= (1.5 / 2.75)) * t + 0.75;
        }
        if (t < (2.5 / 2.75)) {
          return 7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375;
        }
        return 7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375;
      },
  
      easeInOutBounce: function (t) {
        if (t < 0.5) {
          return effects.easeInBounce(t * 2) * 0.5;
        }
        return effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5;
      }
    };
  
    var helpers_easing = {
      effects: effects
    };
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use Chart.helpers.easing.effects instead.
     * @function Chart.helpers.easingEffects
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers_core.easingEffects = effects;
  
    var PI = Math.PI;
    var RAD_PER_DEG = PI / 180;
    var DOUBLE_PI = PI * 2;
    var HALF_PI = PI / 2;
    var QUARTER_PI = PI / 4;
    var TWO_THIRDS_PI = PI * 2 / 3;
  
    /**
     * @namespace Chart.helpers.canvas
     */
    var exports$1 = {
      /**
       * Clears the entire canvas associated to the given `chart`.
       * @param {Chart} chart - The chart for which to clear the canvas.
       */
      clear: function (chart) {
        chart.ctx.clearRect(0, 0, chart.width, chart.height);
      },
  
      /**
       * Creates a "path" for a rectangle with rounded corners at position (x, y) with a
       * given size (width, height) and the same `radius` for all corners.
       * @param {CanvasRenderingContext2D} ctx - The canvas 2D Context.
       * @param {number} x - The x axis of the coordinate for the rectangle starting point.
       * @param {number} y - The y axis of the coordinate for the rectangle starting point.
       * @param {number} width - The rectangle's width.
       * @param {number} height - The rectangle's height.
       * @param {number} radius - The rounded amount (in pixels) for the four corners.
       * @todo handle `radius` as top-left, top-right, bottom-right, bottom-left array/object?
       */
      roundedRect: function (ctx, x, y, width, height, radius) {
        if (radius) {
          var r = Math.min(radius, height / 2, width / 2);
          var left = x + r;
          var top = y + r;
          var right = x + width - r;
          var bottom = y + height - r;
  
          ctx.moveTo(x, top);
          if (left < right && top < bottom) {
            ctx.arc(left, top, r, -PI, -HALF_PI);
            ctx.arc(right, top, r, -HALF_PI, 0);
            ctx.arc(right, bottom, r, 0, HALF_PI);
            ctx.arc(left, bottom, r, HALF_PI, PI);
          } else if (left < right) {
            ctx.moveTo(left, y);
            ctx.arc(right, top, r, -HALF_PI, HALF_PI);
            ctx.arc(left, top, r, HALF_PI, PI + HALF_PI);
          } else if (top < bottom) {
            ctx.arc(left, top, r, -PI, 0);
            ctx.arc(left, bottom, r, 0, PI);
          } else {
            ctx.arc(left, top, r, -PI, PI);
          }
          ctx.closePath();
          ctx.moveTo(x, y);
        } else {
          ctx.rect(x, y, width, height);
        }
      },
  
      drawPoint: function (ctx, style, radius, x, y, rotation) {
        var type, xOffset, yOffset, size, cornerRadius;
        var rad = (rotation || 0) * RAD_PER_DEG;
  
        if (style && typeof style === 'object') {
          type = style.toString();
          if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
            ctx.drawImage(style, x - style.width / 2, y - style.height / 2, style.width, style.height);
            return;
          }
        }
  
        if (isNaN(radius) || radius <= 0) {
          return;
        }
  
        ctx.beginPath();
  
        switch (style) {
            // Default includes circle
          default:
            ctx.arc(x, y, radius, 0, DOUBLE_PI);
            ctx.closePath();
            break;
          case 'triangle':
            ctx.moveTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
            rad += TWO_THIRDS_PI;
            ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
            rad += TWO_THIRDS_PI;
            ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
            ctx.closePath();
            break;
          case 'rectRounded':
            // NOTE: the rounded rect implementation changed to use `arc` instead of
            // `quadraticCurveTo` since it generates better results when rect is
            // almost a circle. 0.516 (instead of 0.5) produces results with visually
            // closer proportion to the previous impl and it is inscribed in the
            // circle with `radius`. For more details, see the following PRs:
            // https://github.com/chartjs/Chart.js/issues/5597
            // https://github.com/chartjs/Chart.js/issues/5858
            cornerRadius = radius * 0.516;
            size = radius - cornerRadius;
            xOffset = Math.cos(rad + QUARTER_PI) * size;
            yOffset = Math.sin(rad + QUARTER_PI) * size;
            ctx.arc(x - xOffset, y - yOffset, cornerRadius, rad - PI, rad - HALF_PI);
            ctx.arc(x + yOffset, y - xOffset, cornerRadius, rad - HALF_PI, rad);
            ctx.arc(x + xOffset, y + yOffset, cornerRadius, rad, rad + HALF_PI);
            ctx.arc(x - yOffset, y + xOffset, cornerRadius, rad + HALF_PI, rad + PI);
            ctx.closePath();
            break;
          case 'rect':
            if (!rotation) {
              size = Math.SQRT1_2 * radius;
              ctx.rect(x - size, y - size, 2 * size, 2 * size);
              break;
            }
            rad += QUARTER_PI;
            /* falls through */
          case 'rectRot':
            xOffset = Math.cos(rad) * radius;
            yOffset = Math.sin(rad) * radius;
            ctx.moveTo(x - xOffset, y - yOffset);
            ctx.lineTo(x + yOffset, y - xOffset);
            ctx.lineTo(x + xOffset, y + yOffset);
            ctx.lineTo(x - yOffset, y + xOffset);
            ctx.closePath();
            break;
          case 'crossRot':
            rad += QUARTER_PI;
            /* falls through */
          case 'cross':
            xOffset = Math.cos(rad) * radius;
            yOffset = Math.sin(rad) * radius;
            ctx.moveTo(x - xOffset, y - yOffset);
            ctx.lineTo(x + xOffset, y + yOffset);
            ctx.moveTo(x + yOffset, y - xOffset);
            ctx.lineTo(x - yOffset, y + xOffset);
            break;
          case 'star':
            xOffset = Math.cos(rad) * radius;
            yOffset = Math.sin(rad) * radius;
            ctx.moveTo(x - xOffset, y - yOffset);
            ctx.lineTo(x + xOffset, y + yOffset);
            ctx.moveTo(x + yOffset, y - xOffset);
            ctx.lineTo(x - yOffset, y + xOffset);
            rad += QUARTER_PI;
            xOffset = Math.cos(rad) * radius;
            yOffset = Math.sin(rad) * radius;
            ctx.moveTo(x - xOffset, y - yOffset);
            ctx.lineTo(x + xOffset, y + yOffset);
            ctx.moveTo(x + yOffset, y - xOffset);
            ctx.lineTo(x - yOffset, y + xOffset);
            break;
          case 'line':
            xOffset = Math.cos(rad) * radius;
            yOffset = Math.sin(rad) * radius;
            ctx.moveTo(x - xOffset, y - yOffset);
            ctx.lineTo(x + xOffset, y + yOffset);
            break;
          case 'dash':
            ctx.moveTo(x, y);
            ctx.lineTo(x + Math.cos(rad) * radius, y + Math.sin(rad) * radius);
            break;
        }
  
        ctx.fill();
        ctx.stroke();
      },
  
      /**
       * Returns true if the point is inside the rectangle
       * @param {object} point - The point to test
       * @param {object} area - The rectangle
       * @returns {boolean}
       * @private
       */
      _isPointInArea: function (point, area) {
        var epsilon = 1e-6; // 1e-6 is margin in pixels for accumulated error.
  
        return point.x > area.left - epsilon && point.x < area.right + epsilon &&
            point.y > area.top - epsilon && point.y < area.bottom + epsilon;
      },
  
      clipArea: function (ctx, area) {
        ctx.save();
        ctx.beginPath();
        ctx.rect(area.left, area.top, area.right - area.left, area.bottom - area.top);
        ctx.clip();
      },
  
      unclipArea: function (ctx) {
        ctx.restore();
      },
  
      lineTo: function (ctx, previous, target, flip) {
        var stepped = target.steppedLine;
        if (stepped) {
          if (stepped === 'middle') {
            var midpoint = (previous.x + target.x) / 2.0;
            ctx.lineTo(midpoint, flip ? target.y : previous.y);
            ctx.lineTo(midpoint, flip ? previous.y : target.y);
          } else if ((stepped === 'after' && !flip) || (stepped !== 'after' && flip)) {
            ctx.lineTo(previous.x, target.y);
          } else {
            ctx.lineTo(target.x, previous.y);
          }
          ctx.lineTo(target.x, target.y);
          return;
        }
  
        if (!target.tension) {
          ctx.lineTo(target.x, target.y);
          return;
        }
  
        ctx.bezierCurveTo(
            flip ? previous.controlPointPreviousX : previous.controlPointNextX,
            flip ? previous.controlPointPreviousY : previous.controlPointNextY,
            flip ? target.controlPointNextX : target.controlPointPreviousX,
            flip ? target.controlPointNextY : target.controlPointPreviousY,
            target.x,
            target.y);
      }
    };
  
    var helpers_canvas = exports$1;
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use Chart.helpers.canvas.clear instead.
     * @namespace Chart.helpers.clear
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers_core.clear = exports$1.clear;
  
    /**
     * Provided for backward compatibility, use Chart.helpers.canvas.roundedRect instead.
     * @namespace Chart.helpers.drawRoundedRectangle
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers_core.drawRoundedRectangle = function (ctx) {
      ctx.beginPath();
      exports$1.roundedRect.apply(exports$1, arguments);
    };
  
    var defaults = {
      /**
       * @private
       */
      _set: function (scope, values) {
        return helpers_core.merge(this[scope] || (this[scope] = {}), values);
      }
    };
  
    defaults._set('global', {
      defaultColor: 'rgba(0,0,0,0.1)',
      defaultFontColor: '#666',
      defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
      defaultFontSize: 12,
      defaultFontStyle: 'normal',
      defaultLineHeight: 1.2,
      showLines: true
    });
  
    var core_defaults = defaults;
  
    var valueOrDefault = helpers_core.valueOrDefault;
  
    /**
     * Converts the given font object into a CSS font string.
     * @param {object} font - A font object.
     * @return {string} The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
     * @private
     */
    function toFontString(font) {
      if (!font || helpers_core.isNullOrUndef(font.size) || helpers_core.isNullOrUndef(font.family)) {
        return null;
      }
  
      return (font.style ? font.style + ' ' : '')
          + (font.weight ? font.weight + ' ' : '')
          + font.size + 'px '
          + font.family;
    }
  
    /**
     * @alias Chart.helpers.options
     * @namespace
     */
    var helpers_options = {
      /**
       * Converts the given line height `value` in pixels for a specific font `size`.
       * @param {number|string} value - The lineHeight to parse (eg. 1.6, '14px', '75%', '1.6em').
       * @param {number} size - The font size (in pixels) used to resolve relative `value`.
       * @returns {number} The effective line height in pixels (size * 1.2 if value is invalid).
       * @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
       * @since 2.7.0
       */
      toLineHeight: function (value, size) {
        var matches = ('' + value).match(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
        if (!matches || matches[1] === 'normal') {
          return size * 1.2;
        }
  
        value = +matches[2];
  
        switch (matches[3]) {
          case 'px':
            return value;
          case '%':
            value /= 100;
            break;
          default:
            break;
        }
  
        return size * value;
      },
  
      /**
       * Converts the given value into a padding object with pre-computed width/height.
       * @param {number|object} value - If a number, set the value to all TRBL component,
       *  else, if and object, use defined properties and sets undefined ones to 0.
       * @returns {object} The padding values (top, right, bottom, left, width, height)
       * @since 2.7.0
       */
      toPadding: function (value) {
        var t, r, b, l;
  
        if (helpers_core.isObject(value)) {
          t = +value.top || 0;
          r = +value.right || 0;
          b = +value.bottom || 0;
          l = +value.left || 0;
        } else {
          t = r = b = l = +value || 0;
        }
  
        return {
          top: t,
          right: r,
          bottom: b,
          left: l,
          height: t + b,
          width: l + r
        };
      },
  
      /**
       * Parses font options and returns the font object.
       * @param {object} options - A object that contains font options to be parsed.
       * @return {object} The font object.
       * @todo Support font.* options and renamed to toFont().
       * @private
       */
      _parseFont: function (options) {
        var globalDefaults = core_defaults.global;
        var size = valueOrDefault(options.fontSize, globalDefaults.defaultFontSize);
        var font = {
          family: valueOrDefault(options.fontFamily, globalDefaults.defaultFontFamily),
          lineHeight: helpers_core.options.toLineHeight(valueOrDefault(options.lineHeight, globalDefaults.defaultLineHeight), size),
          size: size,
          style: valueOrDefault(options.fontStyle, globalDefaults.defaultFontStyle),
          weight: null,
          string: ''
        };
  
        font.string = toFontString(font);
        return font;
      },
  
      /**
       * Evaluates the given `inputs` sequentially and returns the first defined value.
       * @param {Array} inputs - An array of values, falling back to the last value.
       * @param {object} [context] - If defined and the current value is a function, the value
       * is called with `context` as first argument and the result becomes the new input.
       * @param {number} [index] - If defined and the current value is an array, the value
       * at `index` become the new input.
       * @since 2.7.0
       */
      resolve: function (inputs, context, index) {
        var i, ilen, value;
  
        for (i = 0, ilen = inputs.length; i < ilen; ++i) {
          value = inputs[i];
          if (value === undefined) {
            continue;
          }
          if (context !== undefined && typeof value === 'function') {
            value = value(context);
          }
          if (index !== undefined && helpers_core.isArray(value)) {
            value = value[index];
          }
          if (value !== undefined) {
            return value;
          }
        }
      }
    };
  
    var helpers$1 = helpers_core;
    var easing = helpers_easing;
    var canvas = helpers_canvas;
    var options = helpers_options;
    helpers$1.easing = easing;
    helpers$1.canvas = canvas;
    helpers$1.options = options;
  
    function interpolate(start, view, model, ease) {
      var keys = Object.keys(model);
      var i, ilen, key, actual, origin, target, type, c0, c1;
  
      for (i = 0, ilen = keys.length; i < ilen; ++i) {
        key = keys[i];
  
        target = model[key];
  
        // if a value is added to the model after pivot() has been called, the view
        // doesn't contain it, so let's initialize the view to the target value.
        if (!view.hasOwnProperty(key)) {
          view[key] = target;
        }
  
        actual = view[key];
  
        if (actual === target || key[0] === '_') {
          continue;
        }
  
        if (!start.hasOwnProperty(key)) {
          start[key] = actual;
        }
  
        origin = start[key];
  
        type = typeof target;
  
        if (type === typeof origin) {
          if (type === 'string') {
            c0 = chartjsColor(origin);
            if (c0.valid) {
              c1 = chartjsColor(target);
              if (c1.valid) {
                view[key] = c1.mix(c0, ease).rgbString();
                continue;
              }
            }
          } else if (helpers$1.isFinite(origin) && helpers$1.isFinite(target)) {
            view[key] = origin + (target - origin) * ease;
            continue;
          }
        }
  
        view[key] = target;
      }
    }
  
    var Element = function (configuration) {
      helpers$1.extend(this, configuration);
      this.initialize.apply(this, arguments);
    };
  
    helpers$1.extend(Element.prototype, {
  
      initialize: function () {
        this.hidden = false;
      },
  
      pivot: function () {
        var me = this;
        if (!me._view) {
          me._view = helpers$1.clone(me._model);
        }
        me._start = {};
        return me;
      },
  
      transition: function (ease) {
        var me = this;
        var model = me._model;
        var start = me._start;
        var view = me._view;
  
        // No animation -> No Transition
        if (!model || ease === 1) {
          me._view = model;
          me._start = null;
          return me;
        }
  
        if (!view) {
          view = me._view = {};
        }
  
        if (!start) {
          start = me._start = {};
        }
  
        interpolate(start, view, model, ease);
  
        return me;
      },
  
      tooltipPosition: function () {
        return {
          x: this._model.x,
          y: this._model.y
        };
      },
  
      hasValue: function () {
        return helpers$1.isNumber(this._model.x) && helpers$1.isNumber(this._model.y);
      }
    });
  
    Element.extend = helpers$1.inherits;
  
    var core_element = Element;
  
    var exports$2 = core_element.extend({
      chart: null, // the animation associated chart instance
      currentStep: 0, // the current animation step
      numSteps: 60, // default number of steps
      easing: '', // the easing to use for this animation
      render: null, // render function used by the animation service
  
      onAnimationProgress: null, // user specified callback to fire on each step of the animation
      onAnimationComplete: null, // user specified callback to fire when the animation finishes
    });
  
    var core_animation = exports$2;
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use Chart.Animation instead
     * @prop Chart.Animation#animationObject
     * @deprecated since version 2.6.0
     * @todo remove at version 3
     */
    Object.defineProperty(exports$2.prototype, 'animationObject', {
      get: function () {
        return this;
      }
    });
  
    /**
     * Provided for backward compatibility, use Chart.Animation#chart instead
     * @prop Chart.Animation#chartInstance
     * @deprecated since version 2.6.0
     * @todo remove at version 3
     */
    Object.defineProperty(exports$2.prototype, 'chartInstance', {
      get: function () {
        return this.chart;
      },
      set: function (value) {
        this.chart = value;
      }
    });
  
    core_defaults._set('global', {
      animation: {
        duration: 1000,
        easing: 'easeOutQuart',
        onProgress: helpers$1.noop,
        onComplete: helpers$1.noop
      }
    });
  
    var core_animations = {
      animations: [],
      request: null,
  
      /**
       * @param {Chart} chart - The chart to animate.
       * @param {Chart.Animation} animation - The animation that we will animate.
       * @param {number} duration - The animation duration in ms.
       * @param {boolean} lazy - if true, the chart is not marked as animating to enable more responsive interactions
       */
      addAnimation: function (chart, animation, duration, lazy) {
        var animations = this.animations;
        var i, ilen;
  
        animation.chart = chart;
        animation.startTime = Date.now();
        animation.duration = duration;
  
        if (!lazy) {
          chart.animating = true;
        }
  
        for (i = 0, ilen = animations.length; i < ilen; ++i) {
          if (animations[i].chart === chart) {
            animations[i] = animation;
            return;
          }
        }
  
        animations.push(animation);
  
        // If there are no animations queued, manually kickstart a digest, for lack of a better word
        if (animations.length === 1) {
          this.requestAnimationFrame();
        }
      },
  
      cancelAnimation: function (chart) {
        var index = helpers$1.findIndex(this.animations, function (animation) {
          return animation.chart === chart;
        });
  
        if (index !== -1) {
          this.animations.splice(index, 1);
          chart.animating = false;
        }
      },
  
      requestAnimationFrame: function () {
        var me = this;
        if (me.request === null) {
          // Skip animation frame requests until the active one is executed.
          // This can happen when processing mouse events, e.g. 'mousemove'
          // and 'mouseout' events will trigger multiple renders.
          me.request = helpers$1.requestAnimFrame.call(window, function () {
            me.request = null;
            me.startDigest();
          });
        }
      },
  
      /**
       * @private
       */
      startDigest: function () {
        var me = this;
  
        me.advance();
  
        // Do we have more stuff to animate?
        if (me.animations.length > 0) {
          me.requestAnimationFrame();
        }
      },
  
      /**
       * @private
       */
      advance: function () {
        var animations = this.animations;
        var animation, chart, numSteps, nextStep;
        var i = 0;
  
        // 1 animation per chart, so we are looping charts here
        while (i < animations.length) {
          animation = animations[i];
          chart = animation.chart;
          numSteps = animation.numSteps;
  
          // Make sure that currentStep starts at 1
          // https://github.com/chartjs/Chart.js/issues/6104
          nextStep = Math.floor((Date.now() - animation.startTime) / animation.duration * numSteps) + 1;
          animation.currentStep = Math.min(nextStep, numSteps);
  
          helpers$1.callback(animation.render, [chart, animation], chart);
          helpers$1.callback(animation.onAnimationProgress, [animation], chart);
  
          if (animation.currentStep >= numSteps) {
            helpers$1.callback(animation.onAnimationComplete, [animation], chart);
            chart.animating = false;
            animations.splice(i, 1);
          } else {
            ++i;
          }
        }
      }
    };
  
    var resolve = helpers$1.options.resolve;
  
    var arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
  
    /**
     * Hooks the array methods that add or remove values ('push', pop', 'shift', 'splice',
     * 'unshift') and notify the listener AFTER the array has been altered. Listeners are
     * called on the 'onData*' callbacks (e.g. onDataPush, etc.) with same arguments.
     */
    function listenArrayEvents(array, listener) {
      if (array._chartjs) {
        array._chartjs.listeners.push(listener);
        return;
      }
  
      Object.defineProperty(array, '_chartjs', {
        configurable: true,
        enumerable: false,
        value: {
          listeners: [listener]
        }
      });
  
      arrayEvents.forEach(function (key) {
        var method = 'onData' + key.charAt(0).toUpperCase() + key.slice(1);
        var base = array[key];
  
        Object.defineProperty(array, key, {
          configurable: true,
          enumerable: false,
          value: function () {
            var args = Array.prototype.slice.call(arguments);
            var res = base.apply(this, args);
  
            helpers$1.each(array._chartjs.listeners, function (object) {
              if (typeof object[method] === 'function') {
                object[method].apply(object, args);
              }
            });
  
            return res;
          }
        });
      });
    }
  
    /**
     * Removes the given array event listener and cleanup extra attached properties (such as
     * the _chartjs stub and overridden methods) if array doesn't have any more listeners.
     */
    function unlistenArrayEvents(array, listener) {
      var stub = array._chartjs;
      if (!stub) {
        return;
      }
  
      var listeners = stub.listeners;
      var index = listeners.indexOf(listener);
      if (index !== -1) {
        listeners.splice(index, 1);
      }
  
      if (listeners.length > 0) {
        return;
      }
  
      arrayEvents.forEach(function (key) {
        delete array[key];
      });
  
      delete array._chartjs;
    }
  
  // Base class for all dataset controllers (line, bar, etc)
    var DatasetController = function (chart, datasetIndex) {
      this.initialize(chart, datasetIndex);
    };
  
    helpers$1.extend(DatasetController.prototype, {
  
      /**
       * Element type used to generate a meta dataset (e.g. Chart.element.Line).
       * @type {Chart.core.element}
       */
      datasetElementType: null,
  
      /**
       * Element type used to generate a meta data (e.g. Chart.element.Point).
       * @type {Chart.core.element}
       */
      dataElementType: null,
  
      initialize: function (chart, datasetIndex) {
        var me = this;
        me.chart = chart;
        me.index = datasetIndex;
        me.linkScales();
        me.addElements();
      },
  
      updateIndex: function (datasetIndex) {
        this.index = datasetIndex;
      },
  
      linkScales: function () {
        var me = this;
        var meta = me.getMeta();
        var dataset = me.getDataset();
  
        if (meta.xAxisID === null || !(meta.xAxisID in me.chart.scales)) {
          meta.xAxisID = dataset.xAxisID || me.chart.options.scales.xAxes[0].id;
        }
        if (meta.yAxisID === null || !(meta.yAxisID in me.chart.scales)) {
          meta.yAxisID = dataset.yAxisID || me.chart.options.scales.yAxes[0].id;
        }
      },
  
      getDataset: function () {
        return this.chart.data.datasets[this.index];
      },
  
      getMeta: function () {
        return this.chart.getDatasetMeta(this.index);
      },
  
      getScaleForId: function (scaleID) {
        return this.chart.scales[scaleID];
      },
  
      /**
       * @private
       */
      _getValueScaleId: function () {
        return this.getMeta().yAxisID;
      },
  
      /**
       * @private
       */
      _getIndexScaleId: function () {
        return this.getMeta().xAxisID;
      },
  
      /**
       * @private
       */
      _getValueScale: function () {
        return this.getScaleForId(this._getValueScaleId());
      },
  
      /**
       * @private
       */
      _getIndexScale: function () {
        return this.getScaleForId(this._getIndexScaleId());
      },
  
      reset: function () {
        this.update(true);
      },
  
      /**
       * @private
       */
      destroy: function () {
        if (this._data) {
          unlistenArrayEvents(this._data, this);
        }
      },
  
      createMetaDataset: function () {
        var me = this;
        var type = me.datasetElementType;
        return type && new type({
          _chart: me.chart,
          _datasetIndex: me.index
        });
      },
  
      createMetaData: function (index) {
        var me = this;
        var type = me.dataElementType;
        return type && new type({
          _chart: me.chart,
          _datasetIndex: me.index,
          _index: index
        });
      },
  
      addElements: function () {
        var me = this;
        var meta = me.getMeta();
        var data = me.getDataset().data || [];
        var metaData = meta.data;
        var i, ilen;
  
        for (i = 0, ilen = data.length; i < ilen; ++i) {
          metaData[i] = metaData[i] || me.createMetaData(i);
        }
  
        meta.dataset = meta.dataset || me.createMetaDataset();
      },
  
      addElementAndReset: function (index) {
        var element = this.createMetaData(index);
        this.getMeta().data.splice(index, 0, element);
        this.updateElement(element, index, true);
      },
  
      buildOrUpdateElements: function () {
        var me = this;
        var dataset = me.getDataset();
        var data = dataset.data || (dataset.data = []);
  
        // In order to correctly handle data addition/deletion animation (an thus simulate
        // real-time charts), we need to monitor these data modifications and synchronize
        // the internal meta data accordingly.
        if (me._data !== data) {
          if (me._data) {
            // This case happens when the user replaced the data array instance.
            unlistenArrayEvents(me._data, me);
          }
  
          if (data && Object.isExtensible(data)) {
            listenArrayEvents(data, me);
          }
          me._data = data;
        }
  
        // Re-sync meta data in case the user replaced the data array or if we missed
        // any updates and so make sure that we handle number of datapoints changing.
        me.resyncElements();
      },
  
      update: helpers$1.noop,
  
      transition: function (easingValue) {
        var meta = this.getMeta();
        var elements = meta.data || [];
        var ilen = elements.length;
        var i = 0;
  
        for (; i < ilen; ++i) {
          elements[i].transition(easingValue);
        }
  
        if (meta.dataset) {
          meta.dataset.transition(easingValue);
        }
      },
  
      draw: function () {
        var meta = this.getMeta();
        var elements = meta.data || [];
        var ilen = elements.length;
        var i = 0;
  
        if (meta.dataset) {
          meta.dataset.draw();
        }
  
        for (; i < ilen; ++i) {
          elements[i].draw();
        }
      },
  
      removeHoverStyle: function (element) {
        helpers$1.merge(element._model, element.$previousStyle || {});
        delete element.$previousStyle;
      },
  
      setHoverStyle: function (element) {
        var dataset = this.chart.data.datasets[element._datasetIndex];
        var index = element._index;
        var custom = element.custom || {};
        var model = element._model;
        var getHoverColor = helpers$1.getHoverColor;
  
        element.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth
        };
  
        model.backgroundColor = resolve([custom.hoverBackgroundColor, dataset.hoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
        model.borderColor = resolve([custom.hoverBorderColor, dataset.hoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
        model.borderWidth = resolve([custom.hoverBorderWidth, dataset.hoverBorderWidth, model.borderWidth], undefined, index);
      },
  
      /**
       * @private
       */
      resyncElements: function () {
        var me = this;
        var meta = me.getMeta();
        var data = me.getDataset().data;
        var numMeta = meta.data.length;
        var numData = data.length;
  
        if (numData < numMeta) {
          meta.data.splice(numData, numMeta - numData);
        } else if (numData > numMeta) {
          me.insertElements(numMeta, numData - numMeta);
        }
      },
  
      /**
       * @private
       */
      insertElements: function (start, count) {
        for (var i = 0; i < count; ++i) {
          this.addElementAndReset(start + i);
        }
      },
  
      /**
       * @private
       */
      onDataPush: function () {
        var count = arguments.length;
        this.insertElements(this.getDataset().data.length - count, count);
      },
  
      /**
       * @private
       */
      onDataPop: function () {
        this.getMeta().data.pop();
      },
  
      /**
       * @private
       */
      onDataShift: function () {
        this.getMeta().data.shift();
      },
  
      /**
       * @private
       */
      onDataSplice: function (start, count) {
        this.getMeta().data.splice(start, count);
        this.insertElements(start, arguments.length - 2);
      },
  
      /**
       * @private
       */
      onDataUnshift: function () {
        this.insertElements(0, arguments.length);
      }
    });
  
    DatasetController.extend = helpers$1.inherits;
  
    var core_datasetController = DatasetController;
  
    core_defaults._set('global', {
      elements: {
        arc: {
          backgroundColor: core_defaults.global.defaultColor,
          borderColor: '#fff',
          borderWidth: 2,
          borderAlign: 'center'
        }
      }
    });
  
    var element_arc = core_element.extend({
      inLabelRange: function (mouseX) {
        var vm = this._view;
  
        if (vm) {
          return (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hoverRadius, 2));
        }
        return false;
      },
  
      inRange: function (chartX, chartY) {
        var vm = this._view;
  
        if (vm) {
          var pointRelativePosition = helpers$1.getAngleFromPoint(vm, {x: chartX, y: chartY});
          var angle = pointRelativePosition.angle;
          var distance = pointRelativePosition.distance;
  
          // Sanitise angle range
          var startAngle = vm.startAngle;
          var endAngle = vm.endAngle;
          while (endAngle < startAngle) {
            endAngle += 2.0 * Math.PI;
          }
          while (angle > endAngle) {
            angle -= 2.0 * Math.PI;
          }
          while (angle < startAngle) {
            angle += 2.0 * Math.PI;
          }
  
          // Check if within the range of the open/close angle
          var betweenAngles = (angle >= startAngle && angle <= endAngle);
          var withinRadius = (distance >= vm.innerRadius && distance <= vm.outerRadius);
  
          return (betweenAngles && withinRadius);
        }
        return false;
      },
  
      getCenterPoint: function () {
        var vm = this._view;
        var halfAngle = (vm.startAngle + vm.endAngle) / 2;
        var halfRadius = (vm.innerRadius + vm.outerRadius) / 2;
        return {
          x: vm.x + Math.cos(halfAngle) * halfRadius,
          y: vm.y + Math.sin(halfAngle) * halfRadius
        };
      },
  
      getArea: function () {
        var vm = this._view;
        return Math.PI * ((vm.endAngle - vm.startAngle) / (2 * Math.PI)) * (Math.pow(vm.outerRadius, 2) - Math.pow(vm.innerRadius, 2));
      },
  
      tooltipPosition: function () {
        var vm = this._view;
        var centreAngle = vm.startAngle + ((vm.endAngle - vm.startAngle) / 2);
        var rangeFromCentre = (vm.outerRadius - vm.innerRadius) / 2 + vm.innerRadius;
  
        return {
          x: vm.x + (Math.cos(centreAngle) * rangeFromCentre),
          y: vm.y + (Math.sin(centreAngle) * rangeFromCentre)
        };
      },
  
      draw: function () {
        var ctx = this._chart.ctx;
        var vm = this._view;
        var sA = vm.startAngle;
        var eA = vm.endAngle;
        var pixelMargin = (vm.borderAlign === 'inner') ? 0.33 : 0;
        var angleMargin;
  
        ctx.save();
  
        ctx.beginPath();
        ctx.arc(vm.x, vm.y, Math.max(vm.outerRadius - pixelMargin, 0), sA, eA);
        ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
        ctx.closePath();
  
        ctx.fillStyle = vm.backgroundColor;
        ctx.fill();
  
        if (vm.borderWidth) {
          if (vm.borderAlign === 'inner') {
            // Draw an inner border by cliping the arc and drawing a double-width border
            // Enlarge the clipping arc by 0.33 pixels to eliminate glitches between borders
            ctx.beginPath();
            angleMargin = pixelMargin / vm.outerRadius;
            ctx.arc(vm.x, vm.y, vm.outerRadius, sA - angleMargin, eA + angleMargin);
            if (vm.innerRadius > pixelMargin) {
              angleMargin = pixelMargin / vm.innerRadius;
              ctx.arc(vm.x, vm.y, vm.innerRadius - pixelMargin, eA + angleMargin, sA - angleMargin, true);
            } else {
              ctx.arc(vm.x, vm.y, pixelMargin, eA + Math.PI / 2, sA - Math.PI / 2);
            }
            ctx.closePath();
            ctx.clip();
  
            ctx.beginPath();
            ctx.arc(vm.x, vm.y, vm.outerRadius, sA, eA);
            ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
            ctx.closePath();
  
            ctx.lineWidth = vm.borderWidth * 2;
            ctx.lineJoin = 'round';
          } else {
            ctx.lineWidth = vm.borderWidth;
            ctx.lineJoin = 'bevel';
          }
  
          ctx.strokeStyle = vm.borderColor;
          ctx.stroke();
        }
  
        ctx.restore();
      }
    });
  
    var valueOrDefault$1 = helpers$1.valueOrDefault;
  
    var defaultColor = core_defaults.global.defaultColor;
  
    core_defaults._set('global', {
      elements: {
        line: {
          tension: 0.4,
          backgroundColor: defaultColor,
          borderWidth: 3,
          borderColor: defaultColor,
          borderCapStyle: 'butt',
          borderDash: [],
          borderDashOffset: 0.0,
          borderJoinStyle: 'miter',
          capBezierPoints: true,
          fill: true, // do we fill in the area between the line and its base axis
        }
      }
    });
  
    var element_line = core_element.extend({
      draw: function () {
        var me = this;
        var vm = me._view;
        var ctx = me._chart.ctx;
        var spanGaps = vm.spanGaps;
        var points = me._children.slice(); // clone array
        var globalDefaults = core_defaults.global;
        var globalOptionLineElements = globalDefaults.elements.line;
        var lastDrawnIndex = -1;
        var index, current, previous, currentVM;
  
        // If we are looping, adding the first point again
        if (me._loop && points.length) {
          points.push(points[0]);
        }
  
        ctx.save();
  
        // Stroke Line Options
        ctx.lineCap = vm.borderCapStyle || globalOptionLineElements.borderCapStyle;
  
        // IE 9 and 10 do not support line dash
        if (ctx.setLineDash) {
          ctx.setLineDash(vm.borderDash || globalOptionLineElements.borderDash);
        }
  
        ctx.lineDashOffset = valueOrDefault$1(vm.borderDashOffset, globalOptionLineElements.borderDashOffset);
        ctx.lineJoin = vm.borderJoinStyle || globalOptionLineElements.borderJoinStyle;
        ctx.lineWidth = valueOrDefault$1(vm.borderWidth, globalOptionLineElements.borderWidth);
        ctx.strokeStyle = vm.borderColor || globalDefaults.defaultColor;
  
        // Stroke Line
        ctx.beginPath();
        lastDrawnIndex = -1;
  
        for (index = 0; index < points.length; ++index) {
          current = points[index];
          previous = helpers$1.previousItem(points, index);
          currentVM = current._view;
  
          // First point moves to it's starting position no matter what
          if (index === 0) {
            if (!currentVM.skip) {
              ctx.moveTo(currentVM.x, currentVM.y);
              lastDrawnIndex = index;
            }
          } else {
            previous = lastDrawnIndex === -1 ? previous : points[lastDrawnIndex];
  
            if (!currentVM.skip) {
              if ((lastDrawnIndex !== (index - 1) && !spanGaps) || lastDrawnIndex === -1) {
                // There was a gap and this is the first point after the gap
                ctx.moveTo(currentVM.x, currentVM.y);
              } else {
                // Line to next point
                helpers$1.canvas.lineTo(ctx, previous._view, current._view);
              }
              lastDrawnIndex = index;
            }
          }
        }
  
        ctx.stroke();
        ctx.restore();
      }
    });
  
    var valueOrDefault$2 = helpers$1.valueOrDefault;
  
    var defaultColor$1 = core_defaults.global.defaultColor;
  
    core_defaults._set('global', {
      elements: {
        point: {
          radius: 3,
          pointStyle: 'circle',
          backgroundColor: defaultColor$1,
          borderColor: defaultColor$1,
          borderWidth: 1,
          // Hover
          hitRadius: 1,
          hoverRadius: 4,
          hoverBorderWidth: 1
        }
      }
    });
  
    function xRange(mouseX) {
      var vm = this._view;
      return vm ? (Math.abs(mouseX - vm.x) < vm.radius + vm.hitRadius) : false;
    }
  
    function yRange(mouseY) {
      var vm = this._view;
      return vm ? (Math.abs(mouseY - vm.y) < vm.radius + vm.hitRadius) : false;
    }
  
    var element_point = core_element.extend({
      inRange: function (mouseX, mouseY) {
        var vm = this._view;
        return vm ? ((Math.pow(mouseX - vm.x, 2) + Math.pow(mouseY - vm.y, 2)) < Math.pow(vm.hitRadius + vm.radius, 2)) : false;
      },
  
      inLabelRange: xRange,
      inXRange: xRange,
      inYRange: yRange,
  
      getCenterPoint: function () {
        var vm = this._view;
        return {
          x: vm.x,
          y: vm.y
        };
      },
  
      getArea: function () {
        return Math.PI * Math.pow(this._view.radius, 2);
      },
  
      tooltipPosition: function () {
        var vm = this._view;
        return {
          x: vm.x,
          y: vm.y,
          padding: vm.radius + vm.borderWidth
        };
      },
  
      draw: function (chartArea) {
        var vm = this._view;
        var ctx = this._chart.ctx;
        var pointStyle = vm.pointStyle;
        var rotation = vm.rotation;
        var radius = vm.radius;
        var x = vm.x;
        var y = vm.y;
        var globalDefaults = core_defaults.global;
        var defaultColor = globalDefaults.defaultColor; // eslint-disable-line no-shadow
  
        if (vm.skip) {
          return;
        }
  
        // Clipping for Points.
        if (chartArea === undefined || helpers$1.canvas._isPointInArea(vm, chartArea)) {
          ctx.strokeStyle = vm.borderColor || defaultColor;
          ctx.lineWidth = valueOrDefault$2(vm.borderWidth, globalDefaults.elements.point.borderWidth);
          ctx.fillStyle = vm.backgroundColor || defaultColor;
          helpers$1.canvas.drawPoint(ctx, pointStyle, radius, x, y, rotation);
        }
      }
    });
  
    var defaultColor$2 = core_defaults.global.defaultColor;
  
    core_defaults._set('global', {
      elements: {
        rectangle: {
          backgroundColor: defaultColor$2,
          borderColor: defaultColor$2,
          borderSkipped: 'bottom',
          borderWidth: 0
        }
      }
    });
  
    function isVertical(vm) {
      return vm && vm.width !== undefined;
    }
  
    /**
     * Helper function to get the bounds of the bar regardless of the orientation
     * @param bar {Chart.Element.Rectangle} the bar
     * @return {Bounds} bounds of the bar
     * @private
     */
    function getBarBounds(vm) {
      var x1, x2, y1, y2, half;
  
      if (isVertical(vm)) {
        half = vm.width / 2;
        x1 = vm.x - half;
        x2 = vm.x + half;
        y1 = Math.min(vm.y, vm.base);
        y2 = Math.max(vm.y, vm.base);
      } else {
        half = vm.height / 2;
        x1 = Math.min(vm.x, vm.base);
        x2 = Math.max(vm.x, vm.base);
        y1 = vm.y - half;
        y2 = vm.y + half;
      }
  
      return {
        left: x1,
        top: y1,
        right: x2,
        bottom: y2
      };
    }
  
    function swap(orig, v1, v2) {
      return orig === v1 ? v2 : orig === v2 ? v1 : orig;
    }
  
    function parseBorderSkipped(vm) {
      var edge = vm.borderSkipped;
      var res = {};
  
      if (!edge) {
        return res;
      }
  
      if (vm.horizontal) {
        if (vm.base > vm.x) {
          edge = swap(edge, 'left', 'right');
        }
      } else if (vm.base < vm.y) {
        edge = swap(edge, 'bottom', 'top');
      }
  
      res[edge] = true;
      return res;
    }
  
    function parseBorderWidth(vm, maxW, maxH) {
      var value = vm.borderWidth;
      var skip = parseBorderSkipped(vm);
      var t, r, b, l;
  
      if (helpers$1.isObject(value)) {
        t = +value.top || 0;
        r = +value.right || 0;
        b = +value.bottom || 0;
        l = +value.left || 0;
      } else {
        t = r = b = l = +value || 0;
      }
  
      return {
        t: skip.top || (t < 0) ? 0 : t > maxH ? maxH : t,
        r: skip.right || (r < 0) ? 0 : r > maxW ? maxW : r,
        b: skip.bottom || (b < 0) ? 0 : b > maxH ? maxH : b,
        l: skip.left || (l < 0) ? 0 : l > maxW ? maxW : l
      };
    }
  
    function boundingRects(vm) {
      var bounds = getBarBounds(vm);
      var width = bounds.right - bounds.left;
      var height = bounds.bottom - bounds.top;
      var border = parseBorderWidth(vm, width / 2, height / 2);
  
      return {
        outer: {
          x: bounds.left,
          y: bounds.top,
          w: width,
          h: height
        },
        inner: {
          x: bounds.left + border.l,
          y: bounds.top + border.t,
          w: width - border.l - border.r,
          h: height - border.t - border.b
        }
      };
    }
  
    function inRange(vm, x, y) {
      var skipX = x === null;
      var skipY = y === null;
      var bounds = !vm || (skipX && skipY) ? false : getBarBounds(vm);
  
      return bounds
          && (skipX || x >= bounds.left && x <= bounds.right)
          && (skipY || y >= bounds.top && y <= bounds.bottom);
    }
  
    var element_rectangle = core_element.extend({
      draw: function () {
        var ctx = this._chart.ctx;
        var vm = this._view;
        var rects = boundingRects(vm);
        var outer = rects.outer;
        var inner = rects.inner;
  
        ctx.fillStyle = vm.backgroundColor;
        ctx.fillRect(outer.x, outer.y, outer.w, outer.h);
  
        if (outer.w === inner.w && outer.h === inner.h) {
          return;
        }
  
        ctx.save();
        ctx.beginPath();
        ctx.rect(outer.x, outer.y, outer.w, outer.h);
        ctx.clip();
        ctx.fillStyle = vm.borderColor;
        ctx.rect(inner.x, inner.y, inner.w, inner.h);
        ctx.fill('evenodd');
        ctx.restore();
      },
  
      height: function () {
        var vm = this._view;
        return vm.base - vm.y;
      },
  
      inRange: function (mouseX, mouseY) {
        return inRange(this._view, mouseX, mouseY);
      },
  
      inLabelRange: function (mouseX, mouseY) {
        var vm = this._view;
        return isVertical(vm)
            ? inRange(vm, mouseX, null)
            : inRange(vm, null, mouseY);
      },
  
      inXRange: function (mouseX) {
        return inRange(this._view, mouseX, null);
      },
  
      inYRange: function (mouseY) {
        return inRange(this._view, null, mouseY);
      },
  
      getCenterPoint: function () {
        var vm = this._view;
        var x, y;
        if (isVertical(vm)) {
          x = vm.x;
          y = (vm.y + vm.base) / 2;
        } else {
          x = (vm.x + vm.base) / 2;
          y = vm.y;
        }
  
        return {x: x, y: y};
      },
  
      getArea: function () {
        var vm = this._view;
  
        return isVertical(vm)
            ? vm.width * Math.abs(vm.y - vm.base)
            : vm.height * Math.abs(vm.x - vm.base);
      },
  
      tooltipPosition: function () {
        var vm = this._view;
        return {
          x: vm.x,
          y: vm.y
        };
      }
    });
  
    var elements = {};
    var Arc = element_arc;
    var Line = element_line;
    var Point = element_point;
    var Rectangle = element_rectangle;
    elements.Arc = Arc;
    elements.Line = Line;
    elements.Point = Point;
    elements.Rectangle = Rectangle;
  
    var resolve$1 = helpers$1.options.resolve;
  
    core_defaults._set('bar', {
      hover: {
        mode: 'label'
      },
  
      scales: {
        xAxes: [{
          type: 'category',
          categoryPercentage: 0.8,
          barPercentage: 0.9,
          offset: true,
          gridLines: {
            offsetGridLines: true
          }
        }],
  
        yAxes: [{
          type: 'linear'
        }]
      }
    });
  
    /**
     * Computes the "optimal" sample size to maintain bars equally sized while preventing overlap.
     * @private
     */
    function computeMinSampleSize(scale, pixels) {
      var min = scale.isHorizontal() ? scale.width : scale.height;
      var ticks = scale.getTicks();
      var prev, curr, i, ilen;
  
      for (i = 1, ilen = pixels.length; i < ilen; ++i) {
        min = Math.min(min, Math.abs(pixels[i] - pixels[i - 1]));
      }
  
      for (i = 0, ilen = ticks.length; i < ilen; ++i) {
        curr = scale.getPixelForTick(i);
        min = i > 0 ? Math.min(min, curr - prev) : min;
        prev = curr;
      }
  
      return min;
    }
  
    /**
     * Computes an "ideal" category based on the absolute bar thickness or, if undefined or null,
     * uses the smallest interval (see computeMinSampleSize) that prevents bar overlapping. This
     * mode currently always generates bars equally sized (until we introduce scriptable options?).
     * @private
     */
    function computeFitCategoryTraits(index, ruler, options) {
      var thickness = options.barThickness;
      var count = ruler.stackCount;
      var curr = ruler.pixels[index];
      var size, ratio;
  
      if (helpers$1.isNullOrUndef(thickness)) {
        size = ruler.min * options.categoryPercentage;
        ratio = options.barPercentage;
      } else {
        // When bar thickness is enforced, category and bar percentages are ignored.
        // Note(SB): we could add support for relative bar thickness (e.g. barThickness: '50%')
        // and deprecate barPercentage since this value is ignored when thickness is absolute.
        size = thickness * count;
        ratio = 1;
      }
  
      return {
        chunk: size / count,
        ratio: ratio,
        start: curr - (size / 2)
      };
    }
  
    /**
     * Computes an "optimal" category that globally arranges bars side by side (no gap when
     * percentage options are 1), based on the previous and following categories. This mode
     * generates bars with different widths when data are not evenly spaced.
     * @private
     */
    function computeFlexCategoryTraits(index, ruler, options) {
      var pixels = ruler.pixels;
      var curr = pixels[index];
      var prev = index > 0 ? pixels[index - 1] : null;
      var next = index < pixels.length - 1 ? pixels[index + 1] : null;
      var percent = options.categoryPercentage;
      var start, size;
  
      if (prev === null) {
        // first data: its size is double based on the next point or,
        // if it's also the last data, we use the scale size.
        prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
      }
  
      if (next === null) {
        // last data: its size is also double based on the previous point.
        next = curr + curr - prev;
      }
  
      start = curr - (curr - Math.min(prev, next)) / 2 * percent;
      size = Math.abs(next - prev) / 2 * percent;
  
      return {
        chunk: size / ruler.stackCount,
        ratio: options.barPercentage,
        start: start
      };
    }
  
    var controller_bar = core_datasetController.extend({
  
      dataElementType: elements.Rectangle,
  
      initialize: function () {
        var me = this;
        var meta;
  
        core_datasetController.prototype.initialize.apply(me, arguments);
  
        meta = me.getMeta();
        meta.stack = me.getDataset().stack;
        meta.bar = true;
      },
  
      update: function (reset) {
        var me = this;
        var rects = me.getMeta().data;
        var i, ilen;
  
        me._ruler = me.getRuler();
  
        for (i = 0, ilen = rects.length; i < ilen; ++i) {
          me.updateElement(rects[i], i, reset);
        }
      },
  
      updateElement: function (rectangle, index, reset) {
        var me = this;
        var meta = me.getMeta();
        var dataset = me.getDataset();
        var options = me._resolveElementOptions(rectangle, index);
  
        rectangle._xScale = me.getScaleForId(meta.xAxisID);
        rectangle._yScale = me.getScaleForId(meta.yAxisID);
        rectangle._datasetIndex = me.index;
        rectangle._index = index;
        rectangle._model = {
          backgroundColor: options.backgroundColor,
          borderColor: options.borderColor,
          borderSkipped: options.borderSkipped,
          borderWidth: options.borderWidth,
          datasetLabel: dataset.label,
          label: me.chart.data.labels[index]
        };
  
        me._updateElementGeometry(rectangle, index, reset);
  
        rectangle.pivot();
      },
  
      /**
       * @private
       */
      _updateElementGeometry: function (rectangle, index, reset) {
        var me = this;
        var model = rectangle._model;
        var vscale = me._getValueScale();
        var base = vscale.getBasePixel();
        var horizontal = vscale.isHorizontal();
        var ruler = me._ruler || me.getRuler();
        var vpixels = me.calculateBarValuePixels(me.index, index);
        var ipixels = me.calculateBarIndexPixels(me.index, index, ruler);
  
        model.horizontal = horizontal;
        model.base = reset ? base : vpixels.base;
        model.x = horizontal ? reset ? base : vpixels.head : ipixels.center;
        model.y = horizontal ? ipixels.center : reset ? base : vpixels.head;
        model.height = horizontal ? ipixels.size : undefined;
        model.width = horizontal ? undefined : ipixels.size;
      },
  
      /**
       * Returns the stacks based on groups and bar visibility.
       * @param {number} [last] - The dataset index
       * @returns {string[]} The list of stack IDs
       * @private
       */
      _getStacks: function (last) {
        var me = this;
        var chart = me.chart;
        var scale = me._getIndexScale();
        var stacked = scale.options.stacked;
        var ilen = last === undefined ? chart.data.datasets.length : last + 1;
        var stacks = [];
        var i, meta;
  
        for (i = 0; i < ilen; ++i) {
          meta = chart.getDatasetMeta(i);
          if (meta.bar && chart.isDatasetVisible(i) &&
              (stacked === false ||
                  (stacked === true && stacks.indexOf(meta.stack) === -1) ||
                  (stacked === undefined && (meta.stack === undefined || stacks.indexOf(meta.stack) === -1)))) {
            stacks.push(meta.stack);
          }
        }
  
        return stacks;
      },
  
      /**
       * Returns the effective number of stacks based on groups and bar visibility.
       * @private
       */
      getStackCount: function () {
        return this._getStacks().length;
      },
  
      /**
       * Returns the stack index for the given dataset based on groups and bar visibility.
       * @param {number} [datasetIndex] - The dataset index
       * @param {string} [name] - The stack name to find
       * @returns {number} The stack index
       * @private
       */
      getStackIndex: function (datasetIndex, name) {
        var stacks = this._getStacks(datasetIndex);
        var index = (name !== undefined)
            ? stacks.indexOf(name)
            : -1; // indexOf returns -1 if element is not present
  
        return (index === -1)
            ? stacks.length - 1
            : index;
      },
  
      /**
       * @private
       */
      getRuler: function () {
        var me = this;
        var scale = me._getIndexScale();
        var stackCount = me.getStackCount();
        var datasetIndex = me.index;
        var isHorizontal = scale.isHorizontal();
        var start = isHorizontal ? scale.left : scale.top;
        var end = start + (isHorizontal ? scale.width : scale.height);
        var pixels = [];
        var i, ilen, min;
  
        for (i = 0, ilen = me.getMeta().data.length; i < ilen; ++i) {
          pixels.push(scale.getPixelForValue(null, i, datasetIndex));
        }
  
        min = helpers$1.isNullOrUndef(scale.options.barThickness)
            ? computeMinSampleSize(scale, pixels)
            : -1;
  
        return {
          min: min,
          pixels: pixels,
          start: start,
          end: end,
          stackCount: stackCount,
          scale: scale
        };
      },
  
      /**
       * Note: pixel values are not clamped to the scale area.
       * @private
       */
      calculateBarValuePixels: function (datasetIndex, index) {
        var me = this;
        var chart = me.chart;
        var meta = me.getMeta();
        var scale = me._getValueScale();
        var isHorizontal = scale.isHorizontal();
        var datasets = chart.data.datasets;
        var value = +scale.getRightValue(datasets[datasetIndex].data[index]);
        var minBarLength = scale.options.minBarLength;
        var stacked = scale.options.stacked;
        var stack = meta.stack;
        var start = 0;
        var i, imeta, ivalue, base, head, size;
  
        if (stacked || (stacked === undefined && stack !== undefined)) {
          for (i = 0; i < datasetIndex; ++i) {
            imeta = chart.getDatasetMeta(i);
  
            if (imeta.bar &&
                imeta.stack === stack &&
                imeta.controller._getValueScaleId() === scale.id &&
                chart.isDatasetVisible(i)) {
  
              ivalue = +scale.getRightValue(datasets[i].data[index]);
              if ((value < 0 && ivalue < 0) || (value >= 0 && ivalue > 0)) {
                start += ivalue;
              }
            }
          }
        }
  
        base = scale.getPixelForValue(start);
        head = scale.getPixelForValue(start + value);
        size = head - base;
  
        if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
          size = minBarLength;
          if (value >= 0 && !isHorizontal || value < 0 && isHorizontal) {
            head = base - minBarLength;
          } else {
            head = base + minBarLength;
          }
        }
  
        return {
          size: size,
          base: base,
          head: head,
          center: head + size / 2
        };
      },
  
      /**
       * @private
       */
      calculateBarIndexPixels: function (datasetIndex, index, ruler) {
        var me = this;
        var options = ruler.scale.options;
        var range = options.barThickness === 'flex'
            ? computeFlexCategoryTraits(index, ruler, options)
            : computeFitCategoryTraits(index, ruler, options);
  
        var stackIndex = me.getStackIndex(datasetIndex, me.getMeta().stack);
        var center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
        var size = Math.min(
            helpers$1.valueOrDefault(options.maxBarThickness, Infinity),
            range.chunk * range.ratio);
  
        return {
          base: center - size / 2,
          head: center + size / 2,
          center: center,
          size: size
        };
      },
  
      draw: function () {
        var me = this;
        var chart = me.chart;
        var scale = me._getValueScale();
        var rects = me.getMeta().data;
        var dataset = me.getDataset();
        var ilen = rects.length;
        var i = 0;
  
        helpers$1.canvas.clipArea(chart.ctx, chart.chartArea);
  
        for (; i < ilen; ++i) {
          if (!isNaN(scale.getRightValue(dataset.data[i]))) {
            rects[i].draw();
          }
        }
  
        helpers$1.canvas.unclipArea(chart.ctx);
      },
  
      /**
       * @private
       */
      _resolveElementOptions: function (rectangle, index) {
        var me = this;
        var chart = me.chart;
        var datasets = chart.data.datasets;
        var dataset = datasets[me.index];
        var custom = rectangle.custom || {};
        var options = chart.options.elements.rectangle;
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var keys = [
          'backgroundColor',
          'borderColor',
          'borderSkipped',
          'borderWidth'
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$1([
            custom[key],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        return values;
      }
    });
  
    var valueOrDefault$3 = helpers$1.valueOrDefault;
    var resolve$2 = helpers$1.options.resolve;
  
    core_defaults._set('bubble', {
      hover: {
        mode: 'single'
      },
  
      scales: {
        xAxes: [{
          type: 'linear', // bubble should probably use a linear scale by default
          position: 'bottom',
          id: 'x-axis-0' // need an ID so datasets can reference the scale
        }],
        yAxes: [{
          type: 'linear',
          position: 'left',
          id: 'y-axis-0'
        }]
      },
  
      tooltips: {
        callbacks: {
          title: function () {
            // Title doesn't make sense for scatter since we format the data as a point
            return '';
          },
          label: function (item, data) {
            var datasetLabel = data.datasets[item.datasetIndex].label || '';
            var dataPoint = data.datasets[item.datasetIndex].data[item.index];
            return datasetLabel + ': (' + item.xLabel + ', ' + item.yLabel + ', ' + dataPoint.r + ')';
          }
        }
      }
    });
  
    var controller_bubble = core_datasetController.extend({
      /**
       * @protected
       */
      dataElementType: elements.Point,
  
      /**
       * @protected
       */
      update: function (reset) {
        var me = this;
        var meta = me.getMeta();
        var points = meta.data;
  
        // Update Points
        helpers$1.each(points, function (point, index) {
          me.updateElement(point, index, reset);
        });
      },
  
      /**
       * @protected
       */
      updateElement: function (point, index, reset) {
        var me = this;
        var meta = me.getMeta();
        var custom = point.custom || {};
        var xScale = me.getScaleForId(meta.xAxisID);
        var yScale = me.getScaleForId(meta.yAxisID);
        var options = me._resolveElementOptions(point, index);
        var data = me.getDataset().data[index];
        var dsIndex = me.index;
  
        var x = reset ? xScale.getPixelForDecimal(0.5) : xScale.getPixelForValue(typeof data === 'object' ? data : NaN, index, dsIndex);
        var y = reset ? yScale.getBasePixel() : yScale.getPixelForValue(data, index, dsIndex);
  
        point._xScale = xScale;
        point._yScale = yScale;
        point._options = options;
        point._datasetIndex = dsIndex;
        point._index = index;
        point._model = {
          backgroundColor: options.backgroundColor,
          borderColor: options.borderColor,
          borderWidth: options.borderWidth,
          hitRadius: options.hitRadius,
          pointStyle: options.pointStyle,
          rotation: options.rotation,
          radius: reset ? 0 : options.radius,
          skip: custom.skip || isNaN(x) || isNaN(y),
          x: x,
          y: y,
        };
  
        point.pivot();
      },
  
      /**
       * @protected
       */
      setHoverStyle: function (point) {
        var model = point._model;
        var options = point._options;
        var getHoverColor = helpers$1.getHoverColor;
  
        point.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth,
          radius: model.radius
        };
  
        model.backgroundColor = valueOrDefault$3(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
        model.borderColor = valueOrDefault$3(options.hoverBorderColor, getHoverColor(options.borderColor));
        model.borderWidth = valueOrDefault$3(options.hoverBorderWidth, options.borderWidth);
        model.radius = options.radius + options.hoverRadius;
      },
  
      /**
       * @private
       */
      _resolveElementOptions: function (point, index) {
        var me = this;
        var chart = me.chart;
        var datasets = chart.data.datasets;
        var dataset = datasets[me.index];
        var custom = point.custom || {};
        var options = chart.options.elements.point;
        var data = dataset.data[index];
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var keys = [
          'backgroundColor',
          'borderColor',
          'borderWidth',
          'hoverBackgroundColor',
          'hoverBorderColor',
          'hoverBorderWidth',
          'hoverRadius',
          'hitRadius',
          'pointStyle',
          'rotation'
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$2([
            custom[key],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        // Custom radius resolution
        values.radius = resolve$2([
          custom.radius,
          data ? data.r : undefined,
          dataset.radius,
          options.radius
        ], context, index);
  
        return values;
      }
    });
  
    var resolve$3 = helpers$1.options.resolve;
    var valueOrDefault$4 = helpers$1.valueOrDefault;
  
    core_defaults._set('doughnut', {
      animation: {
        // Boolean - Whether we animate the rotation of the Doughnut
        animateRotate: true,
        // Boolean - Whether we animate scaling the Doughnut from the centre
        animateScale: false
      },
      hover: {
        mode: 'single'
      },
      legendCallback: function (chart) {
        var text = [];
        text.push('<ul class="' + chart.id + '-legend">');
  
        var data = chart.data;
        var datasets = data.datasets;
        var labels = data.labels;
  
        if (datasets.length) {
          for (var i = 0; i < datasets[0].data.length; ++i) {
            text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
            if (labels[i]) {
              text.push(labels[i]);
            }
            text.push('</li>');
          }
        }
  
        text.push('</ul>');
        return text.join('');
      },
      legend: {
        labels: {
          generateLabels: function (chart) {
            var data = chart.data;
            if (data.labels.length && data.datasets.length) {
              return data.labels.map(function (label, i) {
                var meta = chart.getDatasetMeta(0);
                var ds = data.datasets[0];
                var arc = meta.data[i];
                var custom = arc && arc.custom || {};
                var arcOpts = chart.options.elements.arc;
                var fill = resolve$3([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
                var stroke = resolve$3([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
                var bw = resolve$3([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);
  
                return {
                  text: label,
                  fillStyle: fill,
                  strokeStyle: stroke,
                  lineWidth: bw,
                  hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
  
                  // Extra data used for toggling the correct item
                  index: i
                };
              });
            }
            return [];
          }
        },
  
        onClick: function (e, legendItem) {
          var index = legendItem.index;
          var chart = this.chart;
          var i, ilen, meta;
  
          for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
            meta = chart.getDatasetMeta(i);
            // toggle visibility of index if exists
            if (meta.data[index]) {
              meta.data[index].hidden = !meta.data[index].hidden;
            }
          }
  
          chart.update();
        }
      },
  
      // The percentage of the chart that we cut out of the middle.
      cutoutPercentage: 50,
  
      // The rotation of the chart, where the first data arc begins.
      rotation: Math.PI * -0.5,
  
      // The total circumference of the chart.
      circumference: Math.PI * 2.0,
  
      // Need to override these to give a nice default
      tooltips: {
        callbacks: {
          title: function () {
            return '';
          },
          label: function (tooltipItem, data) {
            var dataLabel = data.labels[tooltipItem.index];
            var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
  
            if (helpers$1.isArray(dataLabel)) {
              // show value on first line of multiline label
              // need to clone because we are changing the value
              dataLabel = dataLabel.slice();
              dataLabel[0] += value;
            } else {
              dataLabel += value;
            }
  
            return dataLabel;
          }
        }
      }
    });
  
    var controller_doughnut = core_datasetController.extend({
  
      dataElementType: elements.Arc,
  
      linkScales: helpers$1.noop,
  
      // Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
      getRingIndex: function (datasetIndex) {
        var ringIndex = 0;
  
        for (var j = 0; j < datasetIndex; ++j) {
          if (this.chart.isDatasetVisible(j)) {
            ++ringIndex;
          }
        }
  
        return ringIndex;
      },
  
      update: function (reset) {
        var me = this;
        var chart = me.chart;
        var chartArea = chart.chartArea;
        var opts = chart.options;
        var availableWidth = chartArea.right - chartArea.left;
        var availableHeight = chartArea.bottom - chartArea.top;
        var minSize = Math.min(availableWidth, availableHeight);
        var offset = {x: 0, y: 0};
        var meta = me.getMeta();
        var arcs = meta.data;
        var cutoutPercentage = opts.cutoutPercentage;
        var circumference = opts.circumference;
        var chartWeight = me._getRingWeight(me.index);
        var i, ilen;
  
        // If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
        if (circumference < Math.PI * 2.0) {
          var startAngle = opts.rotation % (Math.PI * 2.0);
          startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
          var endAngle = startAngle + circumference;
          var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
          var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
          var contains0 = (startAngle <= 0 && endAngle >= 0) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
          var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
          var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
          var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
          var cutout = cutoutPercentage / 100.0;
          var min = {
            x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)),
            y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))
          };
          var max = {
            x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)),
            y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))
          };
          var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
          minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
          offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
        }
  
        for (i = 0, ilen = arcs.length; i < ilen; ++i) {
          arcs[i]._options = me._resolveElementOptions(arcs[i], i);
        }
  
        chart.borderWidth = me.getMaxBorderWidth();
        chart.outerRadius = Math.max((minSize - chart.borderWidth) / 2, 0);
        chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 0, 0);
        chart.radiusLength = (chart.outerRadius - chart.innerRadius) / (me._getVisibleDatasetWeightTotal() || 1);
        chart.offsetX = offset.x * chart.outerRadius;
        chart.offsetY = offset.y * chart.outerRadius;
  
        meta.total = me.calculateTotal();
  
        me.outerRadius = chart.outerRadius - chart.radiusLength * me._getRingWeightOffset(me.index);
        me.innerRadius = Math.max(me.outerRadius - chart.radiusLength * chartWeight, 0);
  
        for (i = 0, ilen = arcs.length; i < ilen; ++i) {
          me.updateElement(arcs[i], i, reset);
        }
      },
  
      updateElement: function (arc, index, reset) {
        var me = this;
        var chart = me.chart;
        var chartArea = chart.chartArea;
        var opts = chart.options;
        var animationOpts = opts.animation;
        var centerX = (chartArea.left + chartArea.right) / 2;
        var centerY = (chartArea.top + chartArea.bottom) / 2;
        var startAngle = opts.rotation; // non reset case handled later
        var endAngle = opts.rotation; // non reset case handled later
        var dataset = me.getDataset();
        var circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : me.calculateCircumference(dataset.data[index]) * (opts.circumference / (2.0 * Math.PI));
        var innerRadius = reset && animationOpts.animateScale ? 0 : me.innerRadius;
        var outerRadius = reset && animationOpts.animateScale ? 0 : me.outerRadius;
        var options = arc._options || {};
  
        helpers$1.extend(arc, {
          // Utility
          _datasetIndex: me.index,
          _index: index,
  
          // Desired view properties
          _model: {
            backgroundColor: options.backgroundColor,
            borderColor: options.borderColor,
            borderWidth: options.borderWidth,
            borderAlign: options.borderAlign,
            x: centerX + chart.offsetX,
            y: centerY + chart.offsetY,
            startAngle: startAngle,
            endAngle: endAngle,
            circumference: circumference,
            outerRadius: outerRadius,
            innerRadius: innerRadius,
            label: helpers$1.valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
          }
        });
  
        var model = arc._model;
  
        // Set correct angles if not resetting
        if (!reset || !animationOpts.animateRotate) {
          if (index === 0) {
            model.startAngle = opts.rotation;
          } else {
            model.startAngle = me.getMeta().data[index - 1]._model.endAngle;
          }
  
          model.endAngle = model.startAngle + model.circumference;
        }
  
        arc.pivot();
      },
  
      calculateTotal: function () {
        var dataset = this.getDataset();
        var meta = this.getMeta();
        var total = 0;
        var value;
  
        helpers$1.each(meta.data, function (element, index) {
          value = dataset.data[index];
          if (!isNaN(value) && !element.hidden) {
            total += Math.abs(value);
          }
        });
  
        /* if (total === 0) {
  			total = NaN;
  		}*/
  
        return total;
      },
  
      calculateCircumference: function (value) {
        var total = this.getMeta().total;
        if (total > 0 && !isNaN(value)) {
          return (Math.PI * 2.0) * (Math.abs(value) / total);
        }
        return 0;
      },
  
      // gets the max border or hover width to properly scale pie charts
      getMaxBorderWidth: function (arcs) {
        var me = this;
        var max = 0;
        var chart = me.chart;
        var i, ilen, meta, arc, controller, options, borderWidth, hoverWidth;
  
        if (!arcs) {
          // Find the outmost visible dataset
          for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
            if (chart.isDatasetVisible(i)) {
              meta = chart.getDatasetMeta(i);
              arcs = meta.data;
              if (i !== me.index) {
                controller = meta.controller;
              }
              break;
            }
          }
        }
  
        if (!arcs) {
          return 0;
        }
  
        for (i = 0, ilen = arcs.length; i < ilen; ++i) {
          arc = arcs[i];
          options = controller ? controller._resolveElementOptions(arc, i) : arc._options;
          if (options.borderAlign !== 'inner') {
            borderWidth = options.borderWidth;
            hoverWidth = options.hoverBorderWidth;
  
            max = borderWidth > max ? borderWidth : max;
            max = hoverWidth > max ? hoverWidth : max;
          }
        }
        return max;
      },
  
      /**
       * @protected
       */
      setHoverStyle: function (arc) {
        var model = arc._model;
        var options = arc._options;
        var getHoverColor = helpers$1.getHoverColor;
  
        arc.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth,
        };
  
        model.backgroundColor = valueOrDefault$4(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
        model.borderColor = valueOrDefault$4(options.hoverBorderColor, getHoverColor(options.borderColor));
        model.borderWidth = valueOrDefault$4(options.hoverBorderWidth, options.borderWidth);
      },
  
      /**
       * @private
       */
      _resolveElementOptions: function (arc, index) {
        var me = this;
        var chart = me.chart;
        var dataset = me.getDataset();
        var custom = arc.custom || {};
        var options = chart.options.elements.arc;
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var keys = [
          'backgroundColor',
          'borderColor',
          'borderWidth',
          'borderAlign',
          'hoverBackgroundColor',
          'hoverBorderColor',
          'hoverBorderWidth',
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$3([
            custom[key],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        return values;
      },
  
      /**
       * Get radius length offset of the dataset in relation to the visible datasets weights. This allows determining the inner and outer radius correctly
       * @private
       */
      _getRingWeightOffset: function (datasetIndex) {
        var ringWeightOffset = 0;
  
        for (var i = 0; i < datasetIndex; ++i) {
          if (this.chart.isDatasetVisible(i)) {
            ringWeightOffset += this._getRingWeight(i);
          }
        }
  
        return ringWeightOffset;
      },
  
      /**
       * @private
       */
      _getRingWeight: function (dataSetIndex) {
        return Math.max(valueOrDefault$4(this.chart.data.datasets[dataSetIndex].weight, 1), 0);
      },
  
      /**
       * Returns the sum of all visibile data set weights.  This value can be 0.
       * @private
       */
      _getVisibleDatasetWeightTotal: function () {
        return this._getRingWeightOffset(this.chart.data.datasets.length);
      }
    });
  
    core_defaults._set('horizontalBar', {
      hover: {
        mode: 'index',
        axis: 'y'
      },
  
      scales: {
        xAxes: [{
          type: 'linear',
          position: 'bottom'
        }],
  
        yAxes: [{
          type: 'category',
          position: 'left',
          categoryPercentage: 0.8,
          barPercentage: 0.9,
          offset: true,
          gridLines: {
            offsetGridLines: true
          }
        }]
      },
  
      elements: {
        rectangle: {
          borderSkipped: 'left'
        }
      },
  
      tooltips: {
        mode: 'index',
        axis: 'y'
      }
    });
  
    var controller_horizontalBar = controller_bar.extend({
      /**
       * @private
       */
      _getValueScaleId: function () {
        return this.getMeta().xAxisID;
      },
  
      /**
       * @private
       */
      _getIndexScaleId: function () {
        return this.getMeta().yAxisID;
      }
    });
  
    var valueOrDefault$5 = helpers$1.valueOrDefault;
    var resolve$4 = helpers$1.options.resolve;
    var isPointInArea = helpers$1.canvas._isPointInArea;
  
    core_defaults._set('line', {
      showLines: true,
      spanGaps: false,
  
      hover: {
        mode: 'label'
      },
  
      scales: {
        xAxes: [{
          type: 'category',
          id: 'x-axis-0'
        }],
        yAxes: [{
          type: 'linear',
          id: 'y-axis-0'
        }]
      }
    });
  
    function lineEnabled(dataset, options) {
      return valueOrDefault$5(dataset.showLine, options.showLines);
    }
  
    var controller_line = core_datasetController.extend({
  
      datasetElementType: elements.Line,
  
      dataElementType: elements.Point,
  
      update: function (reset) {
        var me = this;
        var meta = me.getMeta();
        var line = meta.dataset;
        var points = meta.data || [];
        var scale = me.getScaleForId(meta.yAxisID);
        var dataset = me.getDataset();
        var showLine = lineEnabled(dataset, me.chart.options);
        var i, ilen;
  
        // Update Line
        if (showLine) {
          // Compatibility: If the properties are defined with only the old name, use those values
          if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
            dataset.lineTension = dataset.tension;
          }
  
          // Utility
          line._scale = scale;
          line._datasetIndex = me.index;
          // Data
          line._children = points;
          // Model
          line._model = me._resolveLineOptions(line);
  
          line.pivot();
        }
  
        // Update Points
        for (i = 0, ilen = points.length; i < ilen; ++i) {
          me.updateElement(points[i], i, reset);
        }
  
        if (showLine && line._model.tension !== 0) {
          me.updateBezierControlPoints();
        }
  
        // Now pivot the point for animation
        for (i = 0, ilen = points.length; i < ilen; ++i) {
          points[i].pivot();
        }
      },
  
      updateElement: function (point, index, reset) {
        var me = this;
        var meta = me.getMeta();
        var custom = point.custom || {};
        var dataset = me.getDataset();
        var datasetIndex = me.index;
        var value = dataset.data[index];
        var yScale = me.getScaleForId(meta.yAxisID);
        var xScale = me.getScaleForId(meta.xAxisID);
        var lineModel = meta.dataset._model;
        var x, y;
  
        var options = me._resolvePointOptions(point, index);
  
        x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
        y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);
  
        // Utility
        point._xScale = xScale;
        point._yScale = yScale;
        point._options = options;
        point._datasetIndex = datasetIndex;
        point._index = index;
  
        // Desired view properties
        point._model = {
          x: x,
          y: y,
          skip: custom.skip || isNaN(x) || isNaN(y),
          // Appearance
          radius: options.radius,
          pointStyle: options.pointStyle,
          rotation: options.rotation,
          backgroundColor: options.backgroundColor,
          borderColor: options.borderColor,
          borderWidth: options.borderWidth,
          tension: valueOrDefault$5(custom.tension, lineModel ? lineModel.tension : 0),
          steppedLine: lineModel ? lineModel.steppedLine : false,
          // Tooltip
          hitRadius: options.hitRadius
        };
      },
  
      /**
       * @private
       */
      _resolvePointOptions: function (element, index) {
        var me = this;
        var chart = me.chart;
        var dataset = chart.data.datasets[me.index];
        var custom = element.custom || {};
        var options = chart.options.elements.point;
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var ELEMENT_OPTIONS = {
          backgroundColor: 'pointBackgroundColor',
          borderColor: 'pointBorderColor',
          borderWidth: 'pointBorderWidth',
          hitRadius: 'pointHitRadius',
          hoverBackgroundColor: 'pointHoverBackgroundColor',
          hoverBorderColor: 'pointHoverBorderColor',
          hoverBorderWidth: 'pointHoverBorderWidth',
          hoverRadius: 'pointHoverRadius',
          pointStyle: 'pointStyle',
          radius: 'pointRadius',
          rotation: 'pointRotation'
        };
        var keys = Object.keys(ELEMENT_OPTIONS);
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$4([
            custom[key],
            dataset[ELEMENT_OPTIONS[key]],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        return values;
      },
  
      /**
       * @private
       */
      _resolveLineOptions: function (element) {
        var me = this;
        var chart = me.chart;
        var dataset = chart.data.datasets[me.index];
        var custom = element.custom || {};
        var options = chart.options;
        var elementOptions = options.elements.line;
        var values = {};
        var i, ilen, key;
  
        var keys = [
          'backgroundColor',
          'borderWidth',
          'borderColor',
          'borderCapStyle',
          'borderDash',
          'borderDashOffset',
          'borderJoinStyle',
          'fill',
          'cubicInterpolationMode'
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$4([
            custom[key],
            dataset[key],
            elementOptions[key]
          ]);
        }
  
        // The default behavior of lines is to break at null values, according
        // to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
        // This option gives lines the ability to span gaps
        values.spanGaps = valueOrDefault$5(dataset.spanGaps, options.spanGaps);
        values.tension = valueOrDefault$5(dataset.lineTension, elementOptions.tension);
        values.steppedLine = resolve$4([custom.steppedLine, dataset.steppedLine, elementOptions.stepped]);
  
        return values;
      },
  
      calculatePointY: function (value, index, datasetIndex) {
        var me = this;
        var chart = me.chart;
        var meta = me.getMeta();
        var yScale = me.getScaleForId(meta.yAxisID);
        var sumPos = 0;
        var sumNeg = 0;
        var i, ds, dsMeta;
  
        if (yScale.options.stacked) {
          for (i = 0; i < datasetIndex; i++) {
            ds = chart.data.datasets[i];
            dsMeta = chart.getDatasetMeta(i);
            if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id && chart.isDatasetVisible(i)) {
              var stackedRightValue = Number(yScale.getRightValue(ds.data[index]));
              if (stackedRightValue < 0) {
                sumNeg += stackedRightValue || 0;
              } else {
                sumPos += stackedRightValue || 0;
              }
            }
          }
  
          var rightValue = Number(yScale.getRightValue(value));
          if (rightValue < 0) {
            return yScale.getPixelForValue(sumNeg + rightValue);
          }
          return yScale.getPixelForValue(sumPos + rightValue);
        }
  
        return yScale.getPixelForValue(value);
      },
  
      updateBezierControlPoints: function () {
        var me = this;
        var chart = me.chart;
        var meta = me.getMeta();
        var lineModel = meta.dataset._model;
        var area = chart.chartArea;
        var points = meta.data || [];
        var i, ilen, model, controlPoints;
  
        // Only consider points that are drawn in case the spanGaps option is used
        if (lineModel.spanGaps) {
          points = points.filter(function (pt) {
            return !pt._model.skip;
          });
        }
  
        function capControlPoint(pt, min, max) {
          return Math.max(Math.min(pt, max), min);
        }
  
        if (lineModel.cubicInterpolationMode === 'monotone') {
          helpers$1.splineCurveMonotone(points);
        } else {
          for (i = 0, ilen = points.length; i < ilen; ++i) {
            model = points[i]._model;
            controlPoints = helpers$1.splineCurve(
                helpers$1.previousItem(points, i)._model,
                model,
                helpers$1.nextItem(points, i)._model,
                lineModel.tension
            );
            model.controlPointPreviousX = controlPoints.previous.x;
            model.controlPointPreviousY = controlPoints.previous.y;
            model.controlPointNextX = controlPoints.next.x;
            model.controlPointNextY = controlPoints.next.y;
          }
        }
  
        if (chart.options.elements.line.capBezierPoints) {
          for (i = 0, ilen = points.length; i < ilen; ++i) {
            model = points[i]._model;
            if (isPointInArea(model, area)) {
              if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
                model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
                model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
              }
              if (i < points.length - 1 && isPointInArea(points[i + 1]._model, area)) {
                model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
                model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
              }
            }
          }
        }
      },
  
      draw: function () {
        var me = this;
        var chart = me.chart;
        var meta = me.getMeta();
        var points = meta.data || [];
        var area = chart.chartArea;
        var ilen = points.length;
        var halfBorderWidth;
        var i = 0;
  
        if (lineEnabled(me.getDataset(), chart.options)) {
          halfBorderWidth = (meta.dataset._model.borderWidth || 0) / 2;
  
          helpers$1.canvas.clipArea(chart.ctx, {
            left: area.left,
            right: area.right,
            top: area.top - halfBorderWidth,
            bottom: area.bottom + halfBorderWidth
          });
  
          meta.dataset.draw();
  
          helpers$1.canvas.unclipArea(chart.ctx);
        }
  
        // Draw the points
        for (; i < ilen; ++i) {
          points[i].draw(area);
        }
      },
  
      /**
       * @protected
       */
      setHoverStyle: function (point) {
        var model = point._model;
        var options = point._options;
        var getHoverColor = helpers$1.getHoverColor;
  
        point.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth,
          radius: model.radius
        };
  
        model.backgroundColor = valueOrDefault$5(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
        model.borderColor = valueOrDefault$5(options.hoverBorderColor, getHoverColor(options.borderColor));
        model.borderWidth = valueOrDefault$5(options.hoverBorderWidth, options.borderWidth);
        model.radius = valueOrDefault$5(options.hoverRadius, options.radius);
      },
    });
  
    var resolve$5 = helpers$1.options.resolve;
  
    core_defaults._set('polarArea', {
      scale: {
        type: 'radialLinear',
        angleLines: {
          display: false
        },
        gridLines: {
          circular: true
        },
        pointLabels: {
          display: false
        },
        ticks: {
          beginAtZero: true
        }
      },
  
      // Boolean - Whether to animate the rotation of the chart
      animation: {
        animateRotate: true,
        animateScale: true
      },
  
      startAngle: -0.5 * Math.PI,
      legendCallback: function (chart) {
        var text = [];
        text.push('<ul class="' + chart.id + '-legend">');
  
        var data = chart.data;
        var datasets = data.datasets;
        var labels = data.labels;
  
        if (datasets.length) {
          for (var i = 0; i < datasets[0].data.length; ++i) {
            text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
            if (labels[i]) {
              text.push(labels[i]);
            }
            text.push('</li>');
          }
        }
  
        text.push('</ul>');
        return text.join('');
      },
      legend: {
        labels: {
          generateLabels: function (chart) {
            var data = chart.data;
            if (data.labels.length && data.datasets.length) {
              return data.labels.map(function (label, i) {
                var meta = chart.getDatasetMeta(0);
                var ds = data.datasets[0];
                var arc = meta.data[i];
                var custom = arc.custom || {};
                var arcOpts = chart.options.elements.arc;
                var fill = resolve$5([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
                var stroke = resolve$5([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
                var bw = resolve$5([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);
  
                return {
                  text: label,
                  fillStyle: fill,
                  strokeStyle: stroke,
                  lineWidth: bw,
                  hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
  
                  // Extra data used for toggling the correct item
                  index: i
                };
              });
            }
            return [];
          }
        },
  
        onClick: function (e, legendItem) {
          var index = legendItem.index;
          var chart = this.chart;
          var i, ilen, meta;
  
          for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
            meta = chart.getDatasetMeta(i);
            meta.data[index].hidden = !meta.data[index].hidden;
          }
  
          chart.update();
        }
      },
  
      // Need to override these to give a nice default
      tooltips: {
        callbacks: {
          title: function () {
            return '';
          },
          label: function (item, data) {
            return data.labels[item.index] + ': ' + item.yLabel;
          }
        }
      }
    });
  
    var controller_polarArea = core_datasetController.extend({
  
      dataElementType: elements.Arc,
  
      linkScales: helpers$1.noop,
  
      update: function (reset) {
        var me = this;
        var dataset = me.getDataset();
        var meta = me.getMeta();
        var start = me.chart.options.startAngle || 0;
        var starts = me._starts = [];
        var angles = me._angles = [];
        var arcs = meta.data;
        var i, ilen, angle;
  
        me._updateRadius();
  
        meta.count = me.countVisibleElements();
  
        for (i = 0, ilen = dataset.data.length; i < ilen; i++) {
          starts[i] = start;
          angle = me._computeAngle(i);
          angles[i] = angle;
          start += angle;
        }
  
        for (i = 0, ilen = arcs.length; i < ilen; ++i) {
          arcs[i]._options = me._resolveElementOptions(arcs[i], i);
          me.updateElement(arcs[i], i, reset);
        }
      },
  
      /**
       * @private
       */
      _updateRadius: function () {
        var me = this;
        var chart = me.chart;
        var chartArea = chart.chartArea;
        var opts = chart.options;
        var minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
  
        chart.outerRadius = Math.max(minSize / 2, 0);
        chart.innerRadius = Math.max(opts.cutoutPercentage ? (chart.outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
        chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
  
        me.outerRadius = chart.outerRadius - (chart.radiusLength * me.index);
        me.innerRadius = me.outerRadius - chart.radiusLength;
      },
  
      updateElement: function (arc, index, reset) {
        var me = this;
        var chart = me.chart;
        var dataset = me.getDataset();
        var opts = chart.options;
        var animationOpts = opts.animation;
        var scale = chart.scale;
        var labels = chart.data.labels;
  
        var centerX = scale.xCenter;
        var centerY = scale.yCenter;
  
        // var negHalfPI = -0.5 * Math.PI;
        var datasetStartAngle = opts.startAngle;
        var distance = arc.hidden ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
        var startAngle = me._starts[index];
        var endAngle = startAngle + (arc.hidden ? 0 : me._angles[index]);
  
        var resetRadius = animationOpts.animateScale ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
        var options = arc._options || {};
  
        helpers$1.extend(arc, {
          // Utility
          _datasetIndex: me.index,
          _index: index,
          _scale: scale,
  
          // Desired view properties
          _model: {
            backgroundColor: options.backgroundColor,
            borderColor: options.borderColor,
            borderWidth: options.borderWidth,
            borderAlign: options.borderAlign,
            x: centerX,
            y: centerY,
            innerRadius: 0,
            outerRadius: reset ? resetRadius : distance,
            startAngle: reset && animationOpts.animateRotate ? datasetStartAngle : startAngle,
            endAngle: reset && animationOpts.animateRotate ? datasetStartAngle : endAngle,
            label: helpers$1.valueAtIndexOrDefault(labels, index, labels[index])
          }
        });
  
        arc.pivot();
      },
  
      countVisibleElements: function () {
        var dataset = this.getDataset();
        var meta = this.getMeta();
        var count = 0;
  
        helpers$1.each(meta.data, function (element, index) {
          if (!isNaN(dataset.data[index]) && !element.hidden) {
            count++;
          }
        });
  
        return count;
      },
  
      /**
       * @protected
       */
      setHoverStyle: function (arc) {
        var model = arc._model;
        var options = arc._options;
        var getHoverColor = helpers$1.getHoverColor;
        var valueOrDefault = helpers$1.valueOrDefault;
  
        arc.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth,
        };
  
        model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
        model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
        model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
      },
  
      /**
       * @private
       */
      _resolveElementOptions: function (arc, index) {
        var me = this;
        var chart = me.chart;
        var dataset = me.getDataset();
        var custom = arc.custom || {};
        var options = chart.options.elements.arc;
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var keys = [
          'backgroundColor',
          'borderColor',
          'borderWidth',
          'borderAlign',
          'hoverBackgroundColor',
          'hoverBorderColor',
          'hoverBorderWidth',
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$5([
            custom[key],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        return values;
      },
  
      /**
       * @private
       */
      _computeAngle: function (index) {
        var me = this;
        var count = this.getMeta().count;
        var dataset = me.getDataset();
        var meta = me.getMeta();
  
        if (isNaN(dataset.data[index]) || meta.data[index].hidden) {
          return 0;
        }
  
        // Scriptable options
        var context = {
          chart: me.chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        return resolve$5([
          me.chart.options.elements.arc.angle,
          (2 * Math.PI) / count
        ], context, index);
      }
    });
  
    core_defaults._set('pie', helpers$1.clone(core_defaults.doughnut));
    core_defaults._set('pie', {
      cutoutPercentage: 0
    });
  
  // Pie charts are Doughnut chart with different defaults
    var controller_pie = controller_doughnut;
  
    var valueOrDefault$6 = helpers$1.valueOrDefault;
    var resolve$6 = helpers$1.options.resolve;
  
    core_defaults._set('radar', {
      scale: {
        type: 'radialLinear'
      },
      elements: {
        line: {
          tension: 0 // no bezier in radar
        }
      }
    });
  
    var controller_radar = core_datasetController.extend({
  
      datasetElementType: elements.Line,
  
      dataElementType: elements.Point,
  
      linkScales: helpers$1.noop,
  
      update: function (reset) {
        var me = this;
        var meta = me.getMeta();
        var line = meta.dataset;
        var points = meta.data || [];
        var scale = me.chart.scale;
        var dataset = me.getDataset();
        var i, ilen;
  
        // Compatibility: If the properties are defined with only the old name, use those values
        if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
          dataset.lineTension = dataset.tension;
        }
  
        // Utility
        line._scale = scale;
        line._datasetIndex = me.index;
        // Data
        line._children = points;
        line._loop = true;
        // Model
        line._model = me._resolveLineOptions(line);
  
        line.pivot();
  
        // Update Points
        for (i = 0, ilen = points.length; i < ilen; ++i) {
          me.updateElement(points[i], i, reset);
        }
  
        // Update bezier control points
        me.updateBezierControlPoints();
  
        // Now pivot the point for animation
        for (i = 0, ilen = points.length; i < ilen; ++i) {
          points[i].pivot();
        }
      },
  
      updateElement: function (point, index, reset) {
        var me = this;
        var custom = point.custom || {};
        var dataset = me.getDataset();
        var scale = me.chart.scale;
        var pointPosition = scale.getPointPositionForValue(index, dataset.data[index]);
        var options = me._resolvePointOptions(point, index);
        var lineModel = me.getMeta().dataset._model;
        var x = reset ? scale.xCenter : pointPosition.x;
        var y = reset ? scale.yCenter : pointPosition.y;
  
        // Utility
        point._scale = scale;
        point._options = options;
        point._datasetIndex = me.index;
        point._index = index;
  
        // Desired view properties
        point._model = {
          x: x, // value not used in dataset scale, but we want a consistent API between scales
          y: y,
          skip: custom.skip || isNaN(x) || isNaN(y),
          // Appearance
          radius: options.radius,
          pointStyle: options.pointStyle,
          rotation: options.rotation,
          backgroundColor: options.backgroundColor,
          borderColor: options.borderColor,
          borderWidth: options.borderWidth,
          tension: valueOrDefault$6(custom.tension, lineModel ? lineModel.tension : 0),
  
          // Tooltip
          hitRadius: options.hitRadius
        };
      },
  
      /**
       * @private
       */
      _resolvePointOptions: function (element, index) {
        var me = this;
        var chart = me.chart;
        var dataset = chart.data.datasets[me.index];
        var custom = element.custom || {};
        var options = chart.options.elements.point;
        var values = {};
        var i, ilen, key;
  
        // Scriptable options
        var context = {
          chart: chart,
          dataIndex: index,
          dataset: dataset,
          datasetIndex: me.index
        };
  
        var ELEMENT_OPTIONS = {
          backgroundColor: 'pointBackgroundColor',
          borderColor: 'pointBorderColor',
          borderWidth: 'pointBorderWidth',
          hitRadius: 'pointHitRadius',
          hoverBackgroundColor: 'pointHoverBackgroundColor',
          hoverBorderColor: 'pointHoverBorderColor',
          hoverBorderWidth: 'pointHoverBorderWidth',
          hoverRadius: 'pointHoverRadius',
          pointStyle: 'pointStyle',
          radius: 'pointRadius',
          rotation: 'pointRotation'
        };
        var keys = Object.keys(ELEMENT_OPTIONS);
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$6([
            custom[key],
            dataset[ELEMENT_OPTIONS[key]],
            dataset[key],
            options[key]
          ], context, index);
        }
  
        return values;
      },
  
      /**
       * @private
       */
      _resolveLineOptions: function (element) {
        var me = this;
        var chart = me.chart;
        var dataset = chart.data.datasets[me.index];
        var custom = element.custom || {};
        var options = chart.options.elements.line;
        var values = {};
        var i, ilen, key;
  
        var keys = [
          'backgroundColor',
          'borderWidth',
          'borderColor',
          'borderCapStyle',
          'borderDash',
          'borderDashOffset',
          'borderJoinStyle',
          'fill'
        ];
  
        for (i = 0, ilen = keys.length; i < ilen; ++i) {
          key = keys[i];
          values[key] = resolve$6([
            custom[key],
            dataset[key],
            options[key]
          ]);
        }
  
        values.tension = valueOrDefault$6(dataset.lineTension, options.tension);
  
        return values;
      },
  
      updateBezierControlPoints: function () {
        var me = this;
        var meta = me.getMeta();
        var area = me.chart.chartArea;
        var points = meta.data || [];
        var i, ilen, model, controlPoints;
  
        function capControlPoint(pt, min, max) {
          return Math.max(Math.min(pt, max), min);
        }
  
        for (i = 0, ilen = points.length; i < ilen; ++i) {
          model = points[i]._model;
          controlPoints = helpers$1.splineCurve(
              helpers$1.previousItem(points, i, true)._model,
              model,
              helpers$1.nextItem(points, i, true)._model,
              model.tension
          );
  
          // Prevent the bezier going outside of the bounds of the graph
          model.controlPointPreviousX = capControlPoint(controlPoints.previous.x, area.left, area.right);
          model.controlPointPreviousY = capControlPoint(controlPoints.previous.y, area.top, area.bottom);
          model.controlPointNextX = capControlPoint(controlPoints.next.x, area.left, area.right);
          model.controlPointNextY = capControlPoint(controlPoints.next.y, area.top, area.bottom);
        }
      },
  
      setHoverStyle: function (point) {
        var model = point._model;
        var options = point._options;
        var getHoverColor = helpers$1.getHoverColor;
  
        point.$previousStyle = {
          backgroundColor: model.backgroundColor,
          borderColor: model.borderColor,
          borderWidth: model.borderWidth,
          radius: model.radius
        };
  
        model.backgroundColor = valueOrDefault$6(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
        model.borderColor = valueOrDefault$6(options.hoverBorderColor, getHoverColor(options.borderColor));
        model.borderWidth = valueOrDefault$6(options.hoverBorderWidth, options.borderWidth);
        model.radius = valueOrDefault$6(options.hoverRadius, options.radius);
      }
    });
  
    core_defaults._set('scatter', {
      hover: {
        mode: 'single'
      },
  
      scales: {
        xAxes: [{
          id: 'x-axis-1',    // need an ID so datasets can reference the scale
          type: 'linear',    // scatter should not use a category axis
          position: 'bottom'
        }],
        yAxes: [{
          id: 'y-axis-1',
          type: 'linear',
          position: 'left'
        }]
      },
  
      showLines: false,
  
      tooltips: {
        callbacks: {
          title: function () {
            return '';     // doesn't make sense for scatter since data are formatted as a point
          },
          label: function (item) {
            return '(' + item.xLabel + ', ' + item.yLabel + ')';
          }
        }
      }
    });
  
  // Scatter charts use line controllers
    var controller_scatter = controller_line;
  
  // NOTE export a map in which the key represents the controller type, not
  // the class, and so must be CamelCase in order to be correctly retrieved
  // by the controller in core.controller.js (`controllers[meta.type]`).
  
    var controllers = {
      bar: controller_bar,
      bubble: controller_bubble,
      doughnut: controller_doughnut,
      horizontalBar: controller_horizontalBar,
      line: controller_line,
      polarArea: controller_polarArea,
      pie: controller_pie,
      radar: controller_radar,
      scatter: controller_scatter
    };
  
    /**
     * Helper function to get relative position for an event
     * @param {Event|IEvent} event - The event to get the position for
     * @param {Chart} chart - The chart
     * @returns {object} the event position
     */
    function getRelativePosition(e, chart) {
      if (e.native) {
        return {
          x: e.x,
          y: e.y
        };
      }
  
      return helpers$1.getRelativePosition(e, chart);
    }
  
    /**
     * Helper function to traverse all of the visible elements in the chart
     * @param {Chart} chart - the chart
     * @param {function} handler - the callback to execute for each visible item
     */
    function parseVisibleItems(chart, handler) {
      var datasets = chart.data.datasets;
      var meta, i, j, ilen, jlen;
  
      for (i = 0, ilen = datasets.length; i < ilen; ++i) {
        if (!chart.isDatasetVisible(i)) {
          continue;
        }
  
        meta = chart.getDatasetMeta(i);
        for (j = 0, jlen = meta.data.length; j < jlen; ++j) {
          var element = meta.data[j];
          if (!element._view.skip) {
            handler(element);
          }
        }
      }
    }
  
    /**
     * Helper function to get the items that intersect the event position
     * @param {ChartElement[]} items - elements to filter
     * @param {object} position - the point to be nearest to
     * @return {ChartElement[]} the nearest items
     */
    function getIntersectItems(chart, position) {
      var elements = [];
  
      parseVisibleItems(chart, function (element) {
        if (element.inRange(position.x, position.y)) {
          elements.push(element);
        }
      });
  
      return elements;
    }
  
    /**
     * Helper function to get the items nearest to the event position considering all visible items in teh chart
     * @param {Chart} chart - the chart to look at elements from
     * @param {object} position - the point to be nearest to
     * @param {boolean} intersect - if true, only consider items that intersect the position
     * @param {function} distanceMetric - function to provide the distance between points
     * @return {ChartElement[]} the nearest items
     */
    function getNearestItems(chart, position, intersect, distanceMetric) {
      var minDistance = Number.POSITIVE_INFINITY;
      var nearestItems = [];
  
      parseVisibleItems(chart, function (element) {
        if (intersect && !element.inRange(position.x, position.y)) {
          return;
        }
  
        var center = element.getCenterPoint();
        var distance = distanceMetric(position, center);
        if (distance < minDistance) {
          nearestItems = [element];
          minDistance = distance;
        } else if (distance === minDistance) {
          // Can have multiple items at the same distance in which case we sort by size
          nearestItems.push(element);
        }
      });
  
      return nearestItems;
    }
  
    /**
     * Get a distance metric function for two points based on the
     * axis mode setting
     * @param {string} axis - the axis mode. x|y|xy
     */
    function getDistanceMetricForAxis(axis) {
      var useX = axis.indexOf('x') !== -1;
      var useY = axis.indexOf('y') !== -1;
  
      return function (pt1, pt2) {
        var deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
        var deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
        return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
      };
    }
  
    function indexMode(chart, e, options) {
      var position = getRelativePosition(e, chart);
      // Default axis for index mode is 'x' to match old behaviour
      options.axis = options.axis || 'x';
      var distanceMetric = getDistanceMetricForAxis(options.axis);
      var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
      var elements = [];
  
      if (!items.length) {
        return [];
      }
  
      chart.data.datasets.forEach(function (dataset, datasetIndex) {
        if (chart.isDatasetVisible(datasetIndex)) {
          var meta = chart.getDatasetMeta(datasetIndex);
          var element = meta.data[items[0]._index];
  
          // don't count items that are skipped (null data)
          if (element && !element._view.skip) {
            elements.push(element);
          }
        }
      });
  
      return elements;
    }
  
    /**
     * @interface IInteractionOptions
     */
    /**
     * If true, only consider items that intersect the point
     * @name IInterfaceOptions#boolean
     * @type Boolean
     */
  
    /**
     * Contains interaction related functions
     * @namespace Chart.Interaction
     */
    var core_interaction = {
      // Helper function for different modes
      modes: {
        single: function (chart, e) {
          var position = getRelativePosition(e, chart);
          var elements = [];
  
          parseVisibleItems(chart, function (element) {
            if (element.inRange(position.x, position.y)) {
              elements.push(element);
              return elements;
            }
          });
  
          return elements.slice(0, 1);
        },
  
        /**
         * @function Chart.Interaction.modes.label
         * @deprecated since version 2.4.0
         * @todo remove at version 3
         * @private
         */
        label: indexMode,
  
        /**
         * Returns items at the same index. If the options.intersect parameter is true, we only return items if we intersect something
         * If the options.intersect mode is false, we find the nearest item and return the items at the same index as that item
         * @function Chart.Interaction.modes.index
         * @since v2.4.0
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @param {IInteractionOptions} options - options to use during interaction
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        index: indexMode,
  
        /**
         * Returns items in the same dataset. If the options.intersect parameter is true, we only return items if we intersect something
         * If the options.intersect is false, we find the nearest item and return the items in that dataset
         * @function Chart.Interaction.modes.dataset
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @param {IInteractionOptions} options - options to use during interaction
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        dataset: function (chart, e, options) {
          var position = getRelativePosition(e, chart);
          options.axis = options.axis || 'xy';
          var distanceMetric = getDistanceMetricForAxis(options.axis);
          var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
  
          if (items.length > 0) {
            items = chart.getDatasetMeta(items[0]._datasetIndex).data;
          }
  
          return items;
        },
  
        /**
         * @function Chart.Interaction.modes.x-axis
         * @deprecated since version 2.4.0. Use index mode and intersect == true
         * @todo remove at version 3
         * @private
         */
        'x-axis': function (chart, e) {
          return indexMode(chart, e, {intersect: false});
        },
  
        /**
         * Point mode returns all elements that hit test based on the event position
         * of the event
         * @function Chart.Interaction.modes.intersect
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        point: function (chart, e) {
          var position = getRelativePosition(e, chart);
          return getIntersectItems(chart, position);
        },
  
        /**
         * nearest mode returns the element closest to the point
         * @function Chart.Interaction.modes.intersect
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @param {IInteractionOptions} options - options to use
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        nearest: function (chart, e, options) {
          var position = getRelativePosition(e, chart);
          options.axis = options.axis || 'xy';
          var distanceMetric = getDistanceMetricForAxis(options.axis);
          return getNearestItems(chart, position, options.intersect, distanceMetric);
        },
  
        /**
         * x mode returns the elements that hit-test at the current x coordinate
         * @function Chart.Interaction.modes.x
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @param {IInteractionOptions} options - options to use
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        x: function (chart, e, options) {
          var position = getRelativePosition(e, chart);
          var items = [];
          var intersectsItem = false;
  
          parseVisibleItems(chart, function (element) {
            if (element.inXRange(position.x)) {
              items.push(element);
            }
  
            if (element.inRange(position.x, position.y)) {
              intersectsItem = true;
            }
          });
  
          // If we want to trigger on an intersect and we don't have any items
          // that intersect the position, return nothing
          if (options.intersect && !intersectsItem) {
            items = [];
          }
          return items;
        },
  
        /**
         * y mode returns the elements that hit-test at the current y coordinate
         * @function Chart.Interaction.modes.y
         * @param {Chart} chart - the chart we are returning items from
         * @param {Event} e - the event we are find things at
         * @param {IInteractionOptions} options - options to use
         * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
         */
        y: function (chart, e, options) {
          var position = getRelativePosition(e, chart);
          var items = [];
          var intersectsItem = false;
  
          parseVisibleItems(chart, function (element) {
            if (element.inYRange(position.y)) {
              items.push(element);
            }
  
            if (element.inRange(position.x, position.y)) {
              intersectsItem = true;
            }
          });
  
          // If we want to trigger on an intersect and we don't have any items
          // that intersect the position, return nothing
          if (options.intersect && !intersectsItem) {
            items = [];
          }
          return items;
        }
      }
    };
  
    function filterByPosition(array, position) {
      return helpers$1.where(array, function (v) {
        return v.position === position;
      });
    }
  
    function sortByWeight(array, reverse) {
      array.forEach(function (v, i) {
        v._tmpIndex_ = i;
        return v;
      });
      array.sort(function (a, b) {
        var v0 = reverse ? b : a;
        var v1 = reverse ? a : b;
        return v0.weight === v1.weight ?
            v0._tmpIndex_ - v1._tmpIndex_ :
            v0.weight - v1.weight;
      });
      array.forEach(function (v) {
        delete v._tmpIndex_;
      });
    }
  
    function findMaxPadding(boxes) {
      var top = 0;
      var left = 0;
      var bottom = 0;
      var right = 0;
      helpers$1.each(boxes, function (box) {
        if (box.getPadding) {
          var boxPadding = box.getPadding();
          top = Math.max(top, boxPadding.top);
          left = Math.max(left, boxPadding.left);
          bottom = Math.max(bottom, boxPadding.bottom);
          right = Math.max(right, boxPadding.right);
        }
      });
      return {
        top: top,
        left: left,
        bottom: bottom,
        right: right
      };
    }
  
    function addSizeByPosition(boxes, size) {
      helpers$1.each(boxes, function (box) {
        size[box.position] += box.isHorizontal() ? box.height : box.width;
      });
    }
  
    core_defaults._set('global', {
      layout: {
        padding: {
          top: 0,
          right: 0,
          bottom: 0,
          left: 0
        }
      }
    });
  
    /**
     * @interface ILayoutItem
     * @prop {string} position - The position of the item in the chart layout. Possible values are
     * 'left', 'top', 'right', 'bottom', and 'chartArea'
     * @prop {number} weight - The weight used to sort the item. Higher weights are further away from the chart area
     * @prop {boolean} fullWidth - if true, and the item is horizontal, then push vertical boxes down
     * @prop {function} isHorizontal - returns true if the layout item is horizontal (ie. top or bottom)
     * @prop {function} update - Takes two parameters: width and height. Returns size of item
     * @prop {function} getPadding -  Returns an object with padding on the edges
     * @prop {number} width - Width of item. Must be valid after update()
     * @prop {number} height - Height of item. Must be valid after update()
     * @prop {number} left - Left edge of the item. Set by layout system and cannot be used in update
     * @prop {number} top - Top edge of the item. Set by layout system and cannot be used in update
     * @prop {number} right - Right edge of the item. Set by layout system and cannot be used in update
     * @prop {number} bottom - Bottom edge of the item. Set by layout system and cannot be used in update
     */
  
  // The layout service is very self explanatory.  It's responsible for the layout within a chart.
  // Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
  // It is this service's responsibility of carrying out that layout.
    var core_layouts = {
      defaults: {},
  
      /**
       * Register a box to a chart.
       * A box is simply a reference to an object that requires layout. eg. Scales, Legend, Title.
       * @param {Chart} chart - the chart to use
       * @param {ILayoutItem} item - the item to add to be layed out
       */
      addBox: function (chart, item) {
        if (!chart.boxes) {
          chart.boxes = [];
        }
  
        // initialize item with default values
        item.fullWidth = item.fullWidth || false;
        item.position = item.position || 'top';
        item.weight = item.weight || 0;
  
        chart.boxes.push(item);
      },
  
      /**
       * Remove a layoutItem from a chart
       * @param {Chart} chart - the chart to remove the box from
       * @param {ILayoutItem} layoutItem - the item to remove from the layout
       */
      removeBox: function (chart, layoutItem) {
        var index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
        if (index !== -1) {
          chart.boxes.splice(index, 1);
        }
      },
  
      /**
       * Sets (or updates) options on the given `item`.
       * @param {Chart} chart - the chart in which the item lives (or will be added to)
       * @param {ILayoutItem} item - the item to configure with the given options
       * @param {object} options - the new item options.
       */
      configure: function (chart, item, options) {
        var props = ['fullWidth', 'position', 'weight'];
        var ilen = props.length;
        var i = 0;
        var prop;
  
        for (; i < ilen; ++i) {
          prop = props[i];
          if (options.hasOwnProperty(prop)) {
            item[prop] = options[prop];
          }
        }
      },
  
      /**
       * Fits boxes of the given chart into the given size by having each box measure itself
       * then running a fitting algorithm
       * @param {Chart} chart - the chart
       * @param {number} width - the width to fit into
       * @param {number} height - the height to fit into
       */
      update: function (chart, width, height) {
        if (!chart) {
          return;
        }
  
        var layoutOptions = chart.options.layout || {};
        var padding = helpers$1.options.toPadding(layoutOptions.padding);
        var leftPadding = padding.left;
        var rightPadding = padding.right;
        var topPadding = padding.top;
        var bottomPadding = padding.bottom;
  
        var leftBoxes = filterByPosition(chart.boxes, 'left');
        var rightBoxes = filterByPosition(chart.boxes, 'right');
        var topBoxes = filterByPosition(chart.boxes, 'top');
        var bottomBoxes = filterByPosition(chart.boxes, 'bottom');
        var chartAreaBoxes = filterByPosition(chart.boxes, 'chartArea');
  
        // Sort boxes by weight. A higher weight is further away from the chart area
        sortByWeight(leftBoxes, true);
        sortByWeight(rightBoxes, false);
        sortByWeight(topBoxes, true);
        sortByWeight(bottomBoxes, false);
  
        var verticalBoxes = leftBoxes.concat(rightBoxes);
        var horizontalBoxes = topBoxes.concat(bottomBoxes);
        var outerBoxes = verticalBoxes.concat(horizontalBoxes);
  
        // Essentially we now have any number of boxes on each of the 4 sides.
        // Our canvas looks like the following.
        // The areas L1 and L2 are the left axes. R1 is the right axis, T1 is the top axis and
        // B1 is the bottom axis
        // There are also 4 quadrant-like locations (left to right instead of clockwise) reserved for chart overlays
        // These locations are single-box locations only, when trying to register a chartArea location that is already taken,
        // an error will be thrown.
        //
        // |----------------------------------------------------|
        // |                  T1 (Full Width)                   |
        // |----------------------------------------------------|
        // |    |    |                 T2                  |    |
        // |    |----|-------------------------------------|----|
        // |    |    | C1 |                           | C2 |    |
        // |    |    |----|                           |----|    |
        // |    |    |                                     |    |
        // | L1 | L2 |           ChartArea (C0)            | R1 |
        // |    |    |                                     |    |
        // |    |    |----|                           |----|    |
        // |    |    | C3 |                           | C4 |    |
        // |    |----|-------------------------------------|----|
        // |    |    |                 B1                  |    |
        // |----------------------------------------------------|
        // |                  B2 (Full Width)                   |
        // |----------------------------------------------------|
        //
        // What we do to find the best sizing, we do the following
        // 1. Determine the minimum size of the chart area.
        // 2. Split the remaining width equally between each vertical axis
        // 3. Split the remaining height equally between each horizontal axis
        // 4. Give each layout the maximum size it can be. The layout will return it's minimum size
        // 5. Adjust the sizes of each axis based on it's minimum reported size.
        // 6. Refit each axis
        // 7. Position each axis in the final location
        // 8. Tell the chart the final location of the chart area
        // 9. Tell any axes that overlay the chart area the positions of the chart area
  
        // Step 1
        var chartWidth = width - leftPadding - rightPadding;
        var chartHeight = height - topPadding - bottomPadding;
        var chartAreaWidth = chartWidth / 2; // min 50%
  
        // Step 2
        var verticalBoxWidth = (width - chartAreaWidth) / verticalBoxes.length;
  
        // Step 3
        // TODO re-limit horizontal axis height (this limit has affected only padding calculation since PR 1837)
        // var horizontalBoxHeight = (height - chartAreaHeight) / horizontalBoxes.length;
  
        // Step 4
        var maxChartAreaWidth = chartWidth;
        var maxChartAreaHeight = chartHeight;
        var outerBoxSizes = {top: topPadding, left: leftPadding, bottom: bottomPadding, right: rightPadding};
        var minBoxSizes = [];
        var maxPadding;
  
        function getMinimumBoxSize(box) {
          var minSize;
          var isHorizontal = box.isHorizontal();
  
          if (isHorizontal) {
            minSize = box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, chartHeight / 2);
            maxChartAreaHeight -= minSize.height;
          } else {
            minSize = box.update(verticalBoxWidth, maxChartAreaHeight);
            maxChartAreaWidth -= minSize.width;
          }
  
          minBoxSizes.push({
            horizontal: isHorizontal,
            width: minSize.width,
            box: box,
          });
        }
  
        helpers$1.each(outerBoxes, getMinimumBoxSize);
  
        // If a horizontal box has padding, we move the left boxes over to avoid ugly charts (see issue #2478)
        maxPadding = findMaxPadding(outerBoxes);
  
        // At this point, maxChartAreaHeight and maxChartAreaWidth are the size the chart area could
        // be if the axes are drawn at their minimum sizes.
        // Steps 5 & 6
  
        // Function to fit a box
        function fitBox(box) {
          var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function (minBox) {
            return minBox.box === box;
          });
  
          if (minBoxSize) {
            if (minBoxSize.horizontal) {
              var scaleMargin = {
                left: Math.max(outerBoxSizes.left, maxPadding.left),
                right: Math.max(outerBoxSizes.right, maxPadding.right),
                top: 0,
                bottom: 0
              };
  
              // Don't use min size here because of label rotation. When the labels are rotated, their rotation highly depends
              // on the margin. Sometimes they need to increase in size slightly
              box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, chartHeight / 2, scaleMargin);
            } else {
              box.update(minBoxSize.width, maxChartAreaHeight);
            }
          }
        }
  
        // Update, and calculate the left and right margins for the horizontal boxes
        helpers$1.each(verticalBoxes, fitBox);
        addSizeByPosition(verticalBoxes, outerBoxSizes);
  
        // Set the Left and Right margins for the horizontal boxes
        helpers$1.each(horizontalBoxes, fitBox);
        addSizeByPosition(horizontalBoxes, outerBoxSizes);
  
        function finalFitVerticalBox(box) {
          var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function (minSize) {
            return minSize.box === box;
          });
  
          var scaleMargin = {
            left: 0,
            right: 0,
            top: outerBoxSizes.top,
            bottom: outerBoxSizes.bottom
          };
  
          if (minBoxSize) {
            box.update(minBoxSize.width, maxChartAreaHeight, scaleMargin);
          }
        }
  
        // Let the left layout know the final margin
        helpers$1.each(verticalBoxes, finalFitVerticalBox);
  
        // Recalculate because the size of each layout might have changed slightly due to the margins (label rotation for instance)
        outerBoxSizes = {top: topPadding, left: leftPadding, bottom: bottomPadding, right: rightPadding};
        addSizeByPosition(outerBoxes, outerBoxSizes);
  
        // We may be adding some padding to account for rotated x axis labels
        var leftPaddingAddition = Math.max(maxPadding.left - outerBoxSizes.left, 0);
        outerBoxSizes.left += leftPaddingAddition;
        outerBoxSizes.right += Math.max(maxPadding.right - outerBoxSizes.right, 0);
  
        var topPaddingAddition = Math.max(maxPadding.top - outerBoxSizes.top, 0);
        outerBoxSizes.top += topPaddingAddition;
        outerBoxSizes.bottom += Math.max(maxPadding.bottom - outerBoxSizes.bottom, 0);
  
        // Figure out if our chart area changed. This would occur if the dataset layout label rotation
        // changed due to the application of the margins in step 6. Since we can only get bigger, this is safe to do
        // without calling `fit` again
        var newMaxChartAreaHeight = height - outerBoxSizes.top - outerBoxSizes.bottom;
        var newMaxChartAreaWidth = width - outerBoxSizes.left - outerBoxSizes.right;
  
        if (newMaxChartAreaWidth !== maxChartAreaWidth || newMaxChartAreaHeight !== maxChartAreaHeight) {
          helpers$1.each(verticalBoxes, function (box) {
            box.height = newMaxChartAreaHeight;
          });
  
          helpers$1.each(horizontalBoxes, function (box) {
            if (!box.fullWidth) {
              box.width = newMaxChartAreaWidth;
            }
          });
  
          maxChartAreaHeight = newMaxChartAreaHeight;
          maxChartAreaWidth = newMaxChartAreaWidth;
        }
  
        // Step 7 - Position the boxes
        var left = leftPadding + leftPaddingAddition;
        var top = topPadding + topPaddingAddition;
  
        function placeBox(box) {
          if (box.isHorizontal()) {
            box.left = box.fullWidth ? leftPadding : outerBoxSizes.left;
            box.right = box.fullWidth ? width - rightPadding : outerBoxSizes.left + maxChartAreaWidth;
            box.top = top;
            box.bottom = top + box.height;
  
            // Move to next point
            top = box.bottom;
  
          } else {
  
            box.left = left;
            box.right = left + box.width;
            box.top = outerBoxSizes.top;
            box.bottom = outerBoxSizes.top + maxChartAreaHeight;
  
            // Move to next point
            left = box.right;
          }
        }
  
        helpers$1.each(leftBoxes.concat(topBoxes), placeBox);
  
        // Account for chart width and height
        left += maxChartAreaWidth;
        top += maxChartAreaHeight;
  
        helpers$1.each(rightBoxes, placeBox);
        helpers$1.each(bottomBoxes, placeBox);
  
        // Step 8
        chart.chartArea = {
          left: outerBoxSizes.left,
          top: outerBoxSizes.top,
          right: outerBoxSizes.left + maxChartAreaWidth,
          bottom: outerBoxSizes.top + maxChartAreaHeight
        };
  
        // Step 9
        helpers$1.each(chartAreaBoxes, function (box) {
          box.left = chart.chartArea.left;
          box.top = chart.chartArea.top;
          box.right = chart.chartArea.right;
          box.bottom = chart.chartArea.bottom;
  
          box.update(maxChartAreaWidth, maxChartAreaHeight);
        });
      }
    };
  
    /**
     * Platform fallback implementation (minimal).
     * @see https://github.com/chartjs/Chart.js/pull/4591#issuecomment-319575939
     */
  
    var platform_basic = {
      acquireContext: function (item) {
        if (item && item.canvas) {
          // Support for any object associated to a canvas (including a context2d)
          item = item.canvas;
        }
  
        return item && item.getContext('2d') || null;
      }
    };
  
    var platform_dom = "/*\n * DOM element rendering detection\n * https://davidwalsh.name/detect-node-insertion\n */\n@keyframes chartjs-render-animation {\n\tfrom { opacity: 0.99; }\n\tto { opacity: 1; }\n}\n\n.chartjs-render-monitor {\n\tanimation: chartjs-render-animation 0.001s;\n}\n\n/*\n * DOM element resizing detection\n * https://github.com/marcj/css-element-queries\n */\n.chartjs-size-monitor,\n.chartjs-size-monitor-expand,\n.chartjs-size-monitor-shrink {\n\tposition: absolute;\n\tdirection: ltr;\n\tleft: 0;\n\ttop: 0;\n\tright: 0;\n\tbottom: 0;\n\toverflow: hidden;\n\tpointer-events: none;\n\tvisibility: hidden;\n\tz-index: -1;\n}\n\n.chartjs-size-monitor-expand > div {\n\tposition: absolute;\n\twidth: 1000000px;\n\theight: 1000000px;\n\tleft: 0;\n\ttop: 0;\n}\n\n.chartjs-size-monitor-shrink > div {\n\tposition: absolute;\n\twidth: 200%;\n\theight: 200%;\n\tleft: 0;\n\ttop: 0;\n}\n";
  
    var platform_dom$1 = /*#__PURE__*/Object.freeze({
      default: platform_dom
    });
  
    function getCjsExportFromNamespace(n) {
      return n && n.default || n;
    }
  
    var stylesheet = getCjsExportFromNamespace(platform_dom$1);
  
    var EXPANDO_KEY = '$chartjs';
    var CSS_PREFIX = 'chartjs-';
    var CSS_SIZE_MONITOR = CSS_PREFIX + 'size-monitor';
    var CSS_RENDER_MONITOR = CSS_PREFIX + 'render-monitor';
    var CSS_RENDER_ANIMATION = CSS_PREFIX + 'render-animation';
    var ANIMATION_START_EVENTS = ['animationstart', 'webkitAnimationStart'];
  
    /**
     * DOM event types -> Chart.js event types.
     * Note: only events with different types are mapped.
     * @see https://developer.mozilla.org/en-US/docs/Web/Events
     */
    var EVENT_TYPES = {
      touchstart: 'mousedown',
      touchmove: 'mousemove',
      touchend: 'mouseup',
      pointerenter: 'mouseenter',
      pointerdown: 'mousedown',
      pointermove: 'mousemove',
      pointerup: 'mouseup',
      pointerleave: 'mouseout',
      pointerout: 'mouseout'
    };
  
    /**
     * The "used" size is the final value of a dimension property after all calculations have
     * been performed. This method uses the computed style of `element` but returns undefined
     * if the computed style is not expressed in pixels. That can happen in some cases where
     * `element` has a size relative to its parent and this last one is not yet displayed,
     * for example because of `display: none` on a parent node.
     * @see https://developer.mozilla.org/en-US/docs/Web/CSS/used_value
     * @returns {number} Size in pixels or undefined if unknown.
     */
    function readUsedSize(element, property) {
      var value = helpers$1.getStyle(element, property);
      var matches = value && value.match(/^(\d+)(\.\d+)?px$/);
      return matches ? Number(matches[1]) : undefined;
    }
  
    /**
     * Initializes the canvas style and render size without modifying the canvas display size,
     * since responsiveness is handled by the controller.resize() method. The config is used
     * to determine the aspect ratio to apply in case no explicit height has been specified.
     */
    function initCanvas(canvas, config) {
      var style = canvas.style;
  
      // NOTE(SB) canvas.getAttribute('width') !== canvas.width: in the first case it
      // returns null or '' if no explicit value has been set to the canvas attribute.
      var renderHeight = canvas.getAttribute('height');
      var renderWidth = canvas.getAttribute('width');
  
      // Chart.js modifies some canvas values that we want to restore on destroy
      canvas[EXPANDO_KEY] = {
        initial: {
          height: renderHeight,
          width: renderWidth,
          style: {
            display: style.display,
            height: style.height,
            width: style.width
          }
        }
      };
  
      // Force canvas to display as block to avoid extra space caused by inline
      // elements, which would interfere with the responsive resize process.
      // https://github.com/chartjs/Chart.js/issues/2538
      style.display = style.display || 'block';
  
      if (renderWidth === null || renderWidth === '') {
        var displayWidth = readUsedSize(canvas, 'width');
        if (displayWidth !== undefined) {
          canvas.width = displayWidth;
        }
      }
  
      if (renderHeight === null || renderHeight === '') {
        if (canvas.style.height === '') {
          // If no explicit render height and style height, let's apply the aspect ratio,
          // which one can be specified by the user but also by charts as default option
          // (i.e. options.aspectRatio). If not specified, use canvas aspect ratio of 2.
          canvas.height = canvas.width / (config.options.aspectRatio || 2);
        } else {
          var displayHeight = readUsedSize(canvas, 'height');
          if (displayWidth !== undefined) {
            canvas.height = displayHeight;
          }
        }
      }
  
      return canvas;
    }
  
    /**
     * Detects support for options object argument in addEventListener.
     * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
     * @private
     */
    var supportsEventListenerOptions = (function () {
      var supports = false;
      try {
        var options = Object.defineProperty({}, 'passive', {
          // eslint-disable-next-line getter-return
          get: function () {
            supports = true;
          }
        });
        window.addEventListener('e', null, options);
      } catch (e) {
        // continue regardless of error
      }
      return supports;
    }());
  
  // Default passive to true as expected by Chrome for 'touchstart' and 'touchend' events.
  // https://github.com/chartjs/Chart.js/issues/4287
    var eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;
  
    function addListener(node, type, listener) {
      node.addEventListener(type, listener, eventListenerOptions);
    }
  
    function removeListener(node, type, listener) {
      node.removeEventListener(type, listener, eventListenerOptions);
    }
  
    function createEvent(type, chart, x, y, nativeEvent) {
      return {
        type: type,
        chart: chart,
        native: nativeEvent || null,
        x: x !== undefined ? x : null,
        y: y !== undefined ? y : null,
      };
    }
  
    function fromNativeEvent(event, chart) {
      var type = EVENT_TYPES[event.type] || event.type;
      var pos = helpers$1.getRelativePosition(event, chart);
      return createEvent(type, chart, pos.x, pos.y, event);
    }
  
    function throttled(fn, thisArg) {
      var ticking = false;
      var args = [];
  
      return function () {
        args = Array.prototype.slice.call(arguments);
        thisArg = thisArg || this;
  
        if (!ticking) {
          ticking = true;
          helpers$1.requestAnimFrame.call(window, function () {
            ticking = false;
            fn.apply(thisArg, args);
          });
        }
      };
    }
  
    function createDiv(cls) {
      var el = document.createElement('div');
      el.className = cls || '';
      return el;
    }
  
  // Implementation based on https://github.com/marcj/css-element-queries
    function createResizer(handler) {
      var maxSize = 1000000;
  
      // NOTE(SB) Don't use innerHTML because it could be considered unsafe.
      // https://github.com/chartjs/Chart.js/issues/5902
      var resizer = createDiv(CSS_SIZE_MONITOR);
      var expand = createDiv(CSS_SIZE_MONITOR + '-expand');
      var shrink = createDiv(CSS_SIZE_MONITOR + '-shrink');
  
      expand.appendChild(createDiv());
      shrink.appendChild(createDiv());
  
      resizer.appendChild(expand);
      resizer.appendChild(shrink);
      resizer._reset = function () {
        expand.scrollLeft = maxSize;
        expand.scrollTop = maxSize;
        shrink.scrollLeft = maxSize;
        shrink.scrollTop = maxSize;
      };
  
      var onScroll = function () {
        resizer._reset();
        handler();
      };
  
      addListener(expand, 'scroll', onScroll.bind(expand, 'expand'));
      addListener(shrink, 'scroll', onScroll.bind(shrink, 'shrink'));
  
      return resizer;
    }
  
  // https://davidwalsh.name/detect-node-insertion
    function watchForRender(node, handler) {
      var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
      var proxy = expando.renderProxy = function (e) {
        if (e.animationName === CSS_RENDER_ANIMATION) {
          handler();
        }
      };
  
      helpers$1.each(ANIMATION_START_EVENTS, function (type) {
        addListener(node, type, proxy);
      });
  
      // #4737: Chrome might skip the CSS animation when the CSS_RENDER_MONITOR class
      // is removed then added back immediately (same animation frame?). Accessing the
      // `offsetParent` property will force a reflow and re-evaluate the CSS animation.
      // https://gist.github.com/paulirish/5d52fb081b3570c81e3a#box-metrics
      // https://github.com/chartjs/Chart.js/issues/4737
      expando.reflow = !!node.offsetParent;
  
      node.classList.add(CSS_RENDER_MONITOR);
    }
  
    function unwatchForRender(node) {
      var expando = node[EXPANDO_KEY] || {};
      var proxy = expando.renderProxy;
  
      if (proxy) {
        helpers$1.each(ANIMATION_START_EVENTS, function (type) {
          removeListener(node, type, proxy);
        });
  
        delete expando.renderProxy;
      }
  
      node.classList.remove(CSS_RENDER_MONITOR);
    }
  
    function addResizeListener(node, listener, chart) {
      var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
  
      // Let's keep track of this added resizer and thus avoid DOM query when removing it.
      var resizer = expando.resizer = createResizer(throttled(function () {
        if (expando.resizer) {
          var container = chart.options.maintainAspectRatio && node.parentNode;
          var w = container ? container.clientWidth : 0;
          listener(createEvent('resize', chart));
          if (container && container.clientWidth < w && chart.canvas) {
            // If the container size shrank during chart resize, let's assume
            // scrollbar appeared. So we resize again with the scrollbar visible -
            // effectively making chart smaller and the scrollbar hidden again.
            // Because we are inside `throttled`, and currently `ticking`, scroll
            // events are ignored during this whole 2 resize process.
            // If we assumed wrong and something else happened, we are resizing
            // twice in a frame (potential performance issue)
            listener(createEvent('resize', chart));
          }
        }
      }));
  
      // The resizer needs to be attached to the node parent, so we first need to be
      // sure that `node` is attached to the DOM before injecting the resizer element.
      watchForRender(node, function () {
        if (expando.resizer) {
          var container = node.parentNode;
          if (container && container !== resizer.parentNode) {
            container.insertBefore(resizer, container.firstChild);
          }
  
          // The container size might have changed, let's reset the resizer state.
          resizer._reset();
        }
      });
    }
  
    function removeResizeListener(node) {
      var expando = node[EXPANDO_KEY] || {};
      var resizer = expando.resizer;
  
      delete expando.resizer;
      unwatchForRender(node);
  
      if (resizer && resizer.parentNode) {
        resizer.parentNode.removeChild(resizer);
      }
    }
  
    function injectCSS(platform, css) {
      // https://stackoverflow.com/q/3922139
      var style = platform._style || document.createElement('style');
      if (!platform._style) {
        platform._style = style;
        css = '/* Chart.js */\n' + css;
        style.setAttribute('type', 'text/css');
        document.getElementsByTagName('head')[0].appendChild(style);
      }
  
      style.appendChild(document.createTextNode(css));
    }
  
    var platform_dom$2 = {
      /**
       * When `true`, prevents the automatic injection of the stylesheet required to
       * correctly detect when the chart is added to the DOM and then resized. This
       * switch has been added to allow external stylesheet (`dist/Chart(.min)?.js`)
       * to be manually imported to make this library compatible with any CSP.
       * See https://github.com/chartjs/Chart.js/issues/5208
       */
      disableCSSInjection: false,
  
      /**
       * This property holds whether this platform is enabled for the current environment.
       * Currently used by platform.js to select the proper implementation.
       * @private
       */
      _enabled: typeof window !== 'undefined' && typeof document !== 'undefined',
  
      /**
       * @private
       */
      _ensureLoaded: function () {
        if (this._loaded) {
          return;
        }
  
        this._loaded = true;
  
        // https://github.com/chartjs/Chart.js/issues/5208
        if (!this.disableCSSInjection) {
          injectCSS(this, stylesheet);
        }
      },
  
      acquireContext: function (item, config) {
        if (typeof item === 'string') {
          item = document.getElementById(item);
        } else if (item.length) {
          // Support for array based queries (such as jQuery)
          item = item[0];
        }
  
        if (item && item.canvas) {
          // Support for any object associated to a canvas (including a context2d)
          item = item.canvas;
        }
  
        // To prevent canvas fingerprinting, some add-ons undefine the getContext
        // method, for example: https://github.com/kkapsner/CanvasBlocker
        // https://github.com/chartjs/Chart.js/issues/2807
        var context = item && item.getContext && item.getContext('2d');
  
        // Load platform resources on first chart creation, to make possible to change
        // platform options after importing the library (e.g. `disableCSSInjection`).
        this._ensureLoaded();
  
        // `instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is
        // inside an iframe or when running in a protected environment. We could guess the
        // types from their toString() value but let's keep things flexible and assume it's
        // a sufficient condition if the item has a context2D which has item as `canvas`.
        // https://github.com/chartjs/Chart.js/issues/3887
        // https://github.com/chartjs/Chart.js/issues/4102
        // https://github.com/chartjs/Chart.js/issues/4152
        if (context && context.canvas === item) {
          initCanvas(item, config);
          return context;
        }
  
        return null;
      },
  
      releaseContext: function (context) {
        var canvas = context.canvas;
        if (!canvas[EXPANDO_KEY]) {
          return;
        }
  
        var initial = canvas[EXPANDO_KEY].initial;
        ['height', 'width'].forEach(function (prop) {
          var value = initial[prop];
          if (helpers$1.isNullOrUndef(value)) {
            canvas.removeAttribute(prop);
          } else {
            canvas.setAttribute(prop, value);
          }
        });
  
        helpers$1.each(initial.style || {}, function (value, key) {
          canvas.style[key] = value;
        });
  
        // The canvas render size might have been changed (and thus the state stack discarded),
        // we can't use save() and restore() to restore the initial state. So make sure that at
        // least the canvas context is reset to the default state by setting the canvas width.
        // https://www.w3.org/TR/2011/WD-html5-20110525/the-canvas-element.html
        // eslint-disable-next-line no-self-assign
        canvas.width = canvas.width;
  
        delete canvas[EXPANDO_KEY];
      },
  
      addEventListener: function (chart, type, listener) {
        var canvas = chart.canvas;
        if (type === 'resize') {
          // Note: the resize event is not supported on all browsers.
          addResizeListener(canvas, listener, chart);
          return;
        }
  
        var expando = listener[EXPANDO_KEY] || (listener[EXPANDO_KEY] = {});
        var proxies = expando.proxies || (expando.proxies = {});
        var proxy = proxies[chart.id + '_' + type] = function (event) {
          listener(fromNativeEvent(event, chart));
        };
  
        addListener(canvas, type, proxy);
      },
  
      removeEventListener: function (chart, type, listener) {
        var canvas = chart.canvas;
        if (type === 'resize') {
          // Note: the resize event is not supported on all browsers.
          removeResizeListener(canvas);
          return;
        }
  
        var expando = listener[EXPANDO_KEY] || {};
        var proxies = expando.proxies || {};
        var proxy = proxies[chart.id + '_' + type];
        if (!proxy) {
          return;
        }
  
        removeListener(canvas, type, proxy);
      }
    };
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use EventTarget.addEventListener instead.
     * EventTarget.addEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
     * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
     * @function Chart.helpers.addEvent
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers$1.addEvent = addListener;
  
    /**
     * Provided for backward compatibility, use EventTarget.removeEventListener instead.
     * EventTarget.removeEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
     * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener
     * @function Chart.helpers.removeEvent
     * @deprecated since version 2.7.0
     * @todo remove at version 3
     * @private
     */
    helpers$1.removeEvent = removeListener;
  
  // @TODO Make possible to select another platform at build time.
    var implementation = platform_dom$2._enabled ? platform_dom$2 : platform_basic;
  
    /**
     * @namespace Chart.platform
     * @see https://chartjs.gitbooks.io/proposals/content/Platform.html
     * @since 2.4.0
     */
    var platform = helpers$1.extend({
      /**
       * @since 2.7.0
       */
      initialize: function () {
      },
  
      /**
       * Called at chart construction time, returns a context2d instance implementing
       * the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
       * @param {*} item - The native item from which to acquire context (platform specific)
       * @param {object} options - The chart options
       * @returns {CanvasRenderingContext2D} context2d instance
       */
      acquireContext: function () {
      },
  
      /**
       * Called at chart destruction time, releases any resources associated to the context
       * previously returned by the acquireContext() method.
       * @param {CanvasRenderingContext2D} context - The context2d instance
       * @returns {boolean} true if the method succeeded, else false
       */
      releaseContext: function () {
      },
  
      /**
       * Registers the specified listener on the given chart.
       * @param {Chart} chart - Chart from which to listen for event
       * @param {string} type - The ({@link IEvent}) type to listen for
       * @param {function} listener - Receives a notification (an object that implements
       * the {@link IEvent} interface) when an event of the specified type occurs.
       */
      addEventListener: function () {
      },
  
      /**
       * Removes the specified listener previously registered with addEventListener.
       * @param {Chart} chart - Chart from which to remove the listener
       * @param {string} type - The ({@link IEvent}) type to remove
       * @param {function} listener - The listener function to remove from the event target.
       */
      removeEventListener: function () {
      }
  
    }, implementation);
  
    core_defaults._set('global', {
      plugins: {}
    });
  
    /**
     * The plugin service singleton
     * @namespace Chart.plugins
     * @since 2.1.0
     */
    var core_plugins = {
      /**
       * Globally registered plugins.
       * @private
       */
      _plugins: [],
  
      /**
       * This identifier is used to invalidate the descriptors cache attached to each chart
       * when a global plugin is registered or unregistered. In this case, the cache ID is
       * incremented and descriptors are regenerated during following API calls.
       * @private
       */
      _cacheId: 0,
  
      /**
       * Registers the given plugin(s) if not already registered.
       * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
       */
      register: function (plugins) {
        var p = this._plugins;
        ([]).concat(plugins).forEach(function (plugin) {
          if (p.indexOf(plugin) === -1) {
            p.push(plugin);
          }
        });
  
        this._cacheId++;
      },
  
      /**
       * Unregisters the given plugin(s) only if registered.
       * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
       */
      unregister: function (plugins) {
        var p = this._plugins;
        ([]).concat(plugins).forEach(function (plugin) {
          var idx = p.indexOf(plugin);
          if (idx !== -1) {
            p.splice(idx, 1);
          }
        });
  
        this._cacheId++;
      },
  
      /**
       * Remove all registered plugins.
       * @since 2.1.5
       */
      clear: function () {
        this._plugins = [];
        this._cacheId++;
      },
  
      /**
       * Returns the number of registered plugins?
       * @returns {number}
       * @since 2.1.5
       */
      count: function () {
        return this._plugins.length;
      },
  
      /**
       * Returns all registered plugin instances.
       * @returns {IPlugin[]} array of plugin objects.
       * @since 2.1.5
       */
      getAll: function () {
        return this._plugins;
      },
  
      /**
       * Calls enabled plugins for `chart` on the specified hook and with the given args.
       * This method immediately returns as soon as a plugin explicitly returns false. The
       * returned value can be used, for instance, to interrupt the current action.
       * @param {Chart} chart - The chart instance for which plugins should be called.
       * @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').
       * @param {Array} [args] - Extra arguments to apply to the hook call.
       * @returns {boolean} false if any of the plugins return false, else returns true.
       */
      notify: function (chart, hook, args) {
        var descriptors = this.descriptors(chart);
        var ilen = descriptors.length;
        var i, descriptor, plugin, params, method;
  
        for (i = 0; i < ilen; ++i) {
          descriptor = descriptors[i];
          plugin = descriptor.plugin;
          method = plugin[hook];
          if (typeof method === 'function') {
            params = [chart].concat(args || []);
            params.push(descriptor.options);
            if (method.apply(plugin, params) === false) {
              return false;
            }
          }
        }
  
        return true;
      },
  
      /**
       * Returns descriptors of enabled plugins for the given chart.
       * @returns {object[]} [{ plugin, options }]
       * @private
       */
      descriptors: function (chart) {
        var cache = chart.$plugins || (chart.$plugins = {});
        if (cache.id === this._cacheId) {
          return cache.descriptors;
        }
  
        var plugins = [];
        var descriptors = [];
        var config = (chart && chart.config) || {};
        var options = (config.options && config.options.plugins) || {};
  
        this._plugins.concat(config.plugins || []).forEach(function (plugin) {
          var idx = plugins.indexOf(plugin);
          if (idx !== -1) {
            return;
          }
  
          var id = plugin.id;
          var opts = options[id];
          if (opts === false) {
            return;
          }
  
          if (opts === true) {
            opts = helpers$1.clone(core_defaults.global.plugins[id]);
          }
  
          plugins.push(plugin);
          descriptors.push({
            plugin: plugin,
            options: opts || {}
          });
        });
  
        cache.descriptors = descriptors;
        cache.id = this._cacheId;
        return descriptors;
      },
  
      /**
       * Invalidates cache for the given chart: descriptors hold a reference on plugin option,
       * but in some cases, this reference can be changed by the user when updating options.
       * https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
       * @private
       */
      _invalidate: function (chart) {
        delete chart.$plugins;
      }
    };
  
    var core_scaleService = {
      // Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
      // use the new chart options to grab the correct scale
      constructors: {},
      // Use a registration function so that we can move to an ES6 map when we no longer need to support
      // old browsers
  
      // Scale config defaults
      defaults: {},
      registerScaleType: function (type, scaleConstructor, scaleDefaults) {
        this.constructors[type] = scaleConstructor;
        this.defaults[type] = helpers$1.clone(scaleDefaults);
      },
      getScaleConstructor: function (type) {
        return this.constructors.hasOwnProperty(type) ? this.constructors[type] : undefined;
      },
      getScaleDefaults: function (type) {
        // Return the scale defaults merged with the global settings so that we always use the latest ones
        return this.defaults.hasOwnProperty(type) ? helpers$1.merge({}, [core_defaults.scale, this.defaults[type]]) : {};
      },
      updateScaleDefaults: function (type, additions) {
        var me = this;
        if (me.defaults.hasOwnProperty(type)) {
          me.defaults[type] = helpers$1.extend(me.defaults[type], additions);
        }
      },
      addScalesToLayout: function (chart) {
        // Adds each scale to the chart.boxes array to be sized accordingly
        helpers$1.each(chart.scales, function (scale) {
          // Set ILayoutItem parameters for backwards compatibility
          scale.fullWidth = scale.options.fullWidth;
          scale.position = scale.options.position;
          scale.weight = scale.options.weight;
          core_layouts.addBox(chart, scale);
        });
      }
    };
  
    var valueOrDefault$7 = helpers$1.valueOrDefault;
  
    core_defaults._set('global', {
      tooltips: {
        enabled: true,
        custom: null,
        mode: 'nearest',
        position: 'average',
        intersect: true,
        backgroundColor: 'rgba(0,0,0,0.8)',
        titleFontStyle: 'bold',
        titleSpacing: 2,
        titleMarginBottom: 6,
        titleFontColor: '#fff',
        titleAlign: 'left',
        bodySpacing: 2,
        bodyFontColor: '#fff',
        bodyAlign: 'left',
        footerFontStyle: 'bold',
        footerSpacing: 2,
        footerMarginTop: 6,
        footerFontColor: '#fff',
        footerAlign: 'left',
        yPadding: 6,
        xPadding: 6,
        caretPadding: 2,
        caretSize: 5,
        cornerRadius: 6,
        multiKeyBackground: '#fff',
        displayColors: true,
        borderColor: 'rgba(0,0,0,0)',
        borderWidth: 0,
        callbacks: {
          // Args are: (tooltipItems, data)
          beforeTitle: helpers$1.noop,
          title: function (tooltipItems, data) {
            var title = '';
            var labels = data.labels;
            var labelCount = labels ? labels.length : 0;
  
            if (tooltipItems.length > 0) {
              var item = tooltipItems[0];
              if (item.label) {
                title = item.label;
              } else if (item.xLabel) {
                title = item.xLabel;
              } else if (labelCount > 0 && item.index < labelCount) {
                title = labels[item.index];
              }
            }
  
            return title;
          },
          afterTitle: helpers$1.noop,
  
          // Args are: (tooltipItems, data)
          beforeBody: helpers$1.noop,
  
          // Args are: (tooltipItem, data)
          beforeLabel: helpers$1.noop,
          label: function (tooltipItem, data) {
            var label = data.datasets[tooltipItem.datasetIndex].label || '';
  
            if (label) {
              label += ': ';
            }
            if (!helpers$1.isNullOrUndef(tooltipItem.value)) {
              label += tooltipItem.value;
            } else {
              label += tooltipItem.yLabel;
            }
            return label;
          },
          labelColor: function (tooltipItem, chart) {
            var meta = chart.getDatasetMeta(tooltipItem.datasetIndex);
            var activeElement = meta.data[tooltipItem.index];
            var view = activeElement._view;
            return {
              borderColor: view.borderColor,
              backgroundColor: view.backgroundColor
            };
          },
          labelTextColor: function () {
            return this._options.bodyFontColor;
          },
          afterLabel: helpers$1.noop,
  
          // Args are: (tooltipItems, data)
          afterBody: helpers$1.noop,
  
          // Args are: (tooltipItems, data)
          beforeFooter: helpers$1.noop,
          footer: helpers$1.noop,
          afterFooter: helpers$1.noop
        }
      }
    });
  
    var positioners = {
      /**
       * Average mode places the tooltip at the average position of the elements shown
       * @function Chart.Tooltip.positioners.average
       * @param elements {ChartElement[]} the elements being displayed in the tooltip
       * @returns {object} tooltip position
       */
      average: function (elements) {
        if (!elements.length) {
          return false;
        }
  
        var i, len;
        var x = 0;
        var y = 0;
        var count = 0;
  
        for (i = 0, len = elements.length; i < len; ++i) {
          var el = elements[i];
          if (el && el.hasValue()) {
            var pos = el.tooltipPosition();
            x += pos.x;
            y += pos.y;
            ++count;
          }
        }
  
        return {
          x: x / count,
          y: y / count
        };
      },
  
      /**
       * Gets the tooltip position nearest of the item nearest to the event position
       * @function Chart.Tooltip.positioners.nearest
       * @param elements {Chart.Element[]} the tooltip elements
       * @param eventPosition {object} the position of the event in canvas coordinates
       * @returns {object} the tooltip position
       */
      nearest: function (elements, eventPosition) {
        var x = eventPosition.x;
        var y = eventPosition.y;
        var minDistance = Number.POSITIVE_INFINITY;
        var i, len, nearestElement;
  
        for (i = 0, len = elements.length; i < len; ++i) {
          var el = elements[i];
          if (el && el.hasValue()) {
            var center = el.getCenterPoint();
            var d = helpers$1.distanceBetweenPoints(eventPosition, center);
  
            if (d < minDistance) {
              minDistance = d;
              nearestElement = el;
            }
          }
        }
  
        if (nearestElement) {
          var tp = nearestElement.tooltipPosition();
          x = tp.x;
          y = tp.y;
        }
  
        return {
          x: x,
          y: y
        };
      }
    };
  
  // Helper to push or concat based on if the 2nd parameter is an array or not
    function pushOrConcat(base, toPush) {
      if (toPush) {
        if (helpers$1.isArray(toPush)) {
          // base = base.concat(toPush);
          Array.prototype.push.apply(base, toPush);
        } else {
          base.push(toPush);
        }
      }
  
      return base;
    }
  
    /**
     * Returns array of strings split by newline
     * @param {string} value - The value to split by newline.
     * @returns {string[]} value if newline present - Returned from String split() method
     * @function
     */
    function splitNewlines(str) {
      if ((typeof str === 'string' || str instanceof String) && str.indexOf('\n') > -1) {
        return str.split('\n');
      }
      return str;
    }
  
  
    /**
     * Private helper to create a tooltip item model
     * @param element - the chart element (point, arc, bar) to create the tooltip item for
     * @return new tooltip item
     */
    function createTooltipItem(element) {
      var xScale = element._xScale;
      var yScale = element._yScale || element._scale; // handle radar || polarArea charts
      var index = element._index;
      var datasetIndex = element._datasetIndex;
      var controller = element._chart.getDatasetMeta(datasetIndex).controller;
      var indexScale = controller._getIndexScale();
      var valueScale = controller._getValueScale();
  
      return {
        xLabel: xScale ? xScale.getLabelForIndex(index, datasetIndex) : '',
        yLabel: yScale ? yScale.getLabelForIndex(index, datasetIndex) : '',
        label: indexScale ? '' + indexScale.getLabelForIndex(index, datasetIndex) : '',
        value: valueScale ? '' + valueScale.getLabelForIndex(index, datasetIndex) : '',
        index: index,
        datasetIndex: datasetIndex,
        x: element._model.x,
        y: element._model.y
      };
    }
  
    /**
     * Helper to get the reset model for the tooltip
     * @param tooltipOpts {object} the tooltip options
     */
    function getBaseModel(tooltipOpts) {
      var globalDefaults = core_defaults.global;
  
      return {
        // Positioning
        xPadding: tooltipOpts.xPadding,
        yPadding: tooltipOpts.yPadding,
        xAlign: tooltipOpts.xAlign,
        yAlign: tooltipOpts.yAlign,
  
        // Body
        bodyFontColor: tooltipOpts.bodyFontColor,
        _bodyFontFamily: valueOrDefault$7(tooltipOpts.bodyFontFamily, globalDefaults.defaultFontFamily),
        _bodyFontStyle: valueOrDefault$7(tooltipOpts.bodyFontStyle, globalDefaults.defaultFontStyle),
        _bodyAlign: tooltipOpts.bodyAlign,
        bodyFontSize: valueOrDefault$7(tooltipOpts.bodyFontSize, globalDefaults.defaultFontSize),
        bodySpacing: tooltipOpts.bodySpacing,
  
        // Title
        titleFontColor: tooltipOpts.titleFontColor,
        _titleFontFamily: valueOrDefault$7(tooltipOpts.titleFontFamily, globalDefaults.defaultFontFamily),
        _titleFontStyle: valueOrDefault$7(tooltipOpts.titleFontStyle, globalDefaults.defaultFontStyle),
        titleFontSize: valueOrDefault$7(tooltipOpts.titleFontSize, globalDefaults.defaultFontSize),
        _titleAlign: tooltipOpts.titleAlign,
        titleSpacing: tooltipOpts.titleSpacing,
        titleMarginBottom: tooltipOpts.titleMarginBottom,
  
        // Footer
        footerFontColor: tooltipOpts.footerFontColor,
        _footerFontFamily: valueOrDefault$7(tooltipOpts.footerFontFamily, globalDefaults.defaultFontFamily),
        _footerFontStyle: valueOrDefault$7(tooltipOpts.footerFontStyle, globalDefaults.defaultFontStyle),
        footerFontSize: valueOrDefault$7(tooltipOpts.footerFontSize, globalDefaults.defaultFontSize),
        _footerAlign: tooltipOpts.footerAlign,
        footerSpacing: tooltipOpts.footerSpacing,
        footerMarginTop: tooltipOpts.footerMarginTop,
  
        // Appearance
        caretSize: tooltipOpts.caretSize,
        cornerRadius: tooltipOpts.cornerRadius,
        backgroundColor: tooltipOpts.backgroundColor,
        opacity: 0,
        legendColorBackground: tooltipOpts.multiKeyBackground,
        displayColors: tooltipOpts.displayColors,
        borderColor: tooltipOpts.borderColor,
        borderWidth: tooltipOpts.borderWidth
      };
    }
  
    /**
     * Get the size of the tooltip
     */
    function getTooltipSize(tooltip, model) {
      var ctx = tooltip._chart.ctx;
  
      var height = model.yPadding * 2; // Tooltip Padding
      var width = 0;
  
      // Count of all lines in the body
      var body = model.body;
      var combinedBodyLength = body.reduce(function (count, bodyItem) {
        return count + bodyItem.before.length + bodyItem.lines.length + bodyItem.after.length;
      }, 0);
      combinedBodyLength += model.beforeBody.length + model.afterBody.length;
  
      var titleLineCount = model.title.length;
      var footerLineCount = model.footer.length;
      var titleFontSize = model.titleFontSize;
      var bodyFontSize = model.bodyFontSize;
      var footerFontSize = model.footerFontSize;
  
      height += titleLineCount * titleFontSize; // Title Lines
      height += titleLineCount ? (titleLineCount - 1) * model.titleSpacing : 0; // Title Line Spacing
      height += titleLineCount ? model.titleMarginBottom : 0; // Title's bottom Margin
      height += combinedBodyLength * bodyFontSize; // Body Lines
      height += combinedBodyLength ? (combinedBodyLength - 1) * model.bodySpacing : 0; // Body Line Spacing
      height += footerLineCount ? model.footerMarginTop : 0; // Footer Margin
      height += footerLineCount * (footerFontSize); // Footer Lines
      height += footerLineCount ? (footerLineCount - 1) * model.footerSpacing : 0; // Footer Line Spacing
  
      // Title width
      var widthPadding = 0;
      var maxLineWidth = function (line) {
        width = Math.max(width, ctx.measureText(line).width + widthPadding);
      };
  
      ctx.font = helpers$1.fontString(titleFontSize, model._titleFontStyle, model._titleFontFamily);
      helpers$1.each(model.title, maxLineWidth);
  
      // Body width
      ctx.font = helpers$1.fontString(bodyFontSize, model._bodyFontStyle, model._bodyFontFamily);
      helpers$1.each(model.beforeBody.concat(model.afterBody), maxLineWidth);
  
      // Body lines may include some extra width due to the color box
      widthPadding = model.displayColors ? (bodyFontSize + 2) : 0;
      helpers$1.each(body, function (bodyItem) {
        helpers$1.each(bodyItem.before, maxLineWidth);
        helpers$1.each(bodyItem.lines, maxLineWidth);
        helpers$1.each(bodyItem.after, maxLineWidth);
      });
  
      // Reset back to 0
      widthPadding = 0;
  
      // Footer width
      ctx.font = helpers$1.fontString(footerFontSize, model._footerFontStyle, model._footerFontFamily);
      helpers$1.each(model.footer, maxLineWidth);
  
      // Add padding
      width += 2 * model.xPadding;
  
      return {
        width: width,
        height: height
      };
    }
  
    /**
     * Helper to get the alignment of a tooltip given the size
     */
    function determineAlignment(tooltip, size) {
      var model = tooltip._model;
      var chart = tooltip._chart;
      var chartArea = tooltip._chart.chartArea;
      var xAlign = 'center';
      var yAlign = 'center';
  
      if (model.y < size.height) {
        yAlign = 'top';
      } else if (model.y > (chart.height - size.height)) {
        yAlign = 'bottom';
      }
  
      var lf, rf; // functions to determine left, right alignment
      var olf, orf; // functions to determine if left/right alignment causes tooltip to go outside chart
      var yf; // function to get the y alignment if the tooltip goes outside of the left or right edges
      var midX = (chartArea.left + chartArea.right) / 2;
      var midY = (chartArea.top + chartArea.bottom) / 2;
  
      if (yAlign === 'center') {
        lf = function (x) {
          return x <= midX;
        };
        rf = function (x) {
          return x > midX;
        };
      } else {
        lf = function (x) {
          return x <= (size.width / 2);
        };
        rf = function (x) {
          return x >= (chart.width - (size.width / 2));
        };
      }
  
      olf = function (x) {
        return x + size.width + model.caretSize + model.caretPadding > chart.width;
      };
      orf = function (x) {
        return x - size.width - model.caretSize - model.caretPadding < 0;
      };
      yf = function (y) {
        return y <= midY ? 'top' : 'bottom';
      };
  
      if (lf(model.x)) {
        xAlign = 'left';
  
        // Is tooltip too wide and goes over the right side of the chart.?
        if (olf(model.x)) {
          xAlign = 'center';
          yAlign = yf(model.y);
        }
      } else if (rf(model.x)) {
        xAlign = 'right';
  
        // Is tooltip too wide and goes outside left edge of canvas?
        if (orf(model.x)) {
          xAlign = 'center';
          yAlign = yf(model.y);
        }
      }
  
      var opts = tooltip._options;
      return {
        xAlign: opts.xAlign ? opts.xAlign : xAlign,
        yAlign: opts.yAlign ? opts.yAlign : yAlign
      };
    }
  
    /**
     * Helper to get the location a tooltip needs to be placed at given the initial position (via the vm) and the size and alignment
     */
    function getBackgroundPoint(vm, size, alignment, chart) {
      // Background Position
      var x = vm.x;
      var y = vm.y;
  
      var caretSize = vm.caretSize;
      var caretPadding = vm.caretPadding;
      var cornerRadius = vm.cornerRadius;
      var xAlign = alignment.xAlign;
      var yAlign = alignment.yAlign;
      var paddingAndSize = caretSize + caretPadding;
      var radiusAndPadding = cornerRadius + caretPadding;
  
      if (xAlign === 'right') {
        x -= size.width;
      } else if (xAlign === 'center') {
        x -= (size.width / 2);
        if (x + size.width > chart.width) {
          x = chart.width - size.width;
        }
        if (x < 0) {
          x = 0;
        }
      }
  
      if (yAlign === 'top') {
        y += paddingAndSize;
      } else if (yAlign === 'bottom') {
        y -= size.height + paddingAndSize;
      } else {
        y -= (size.height / 2);
      }
  
      if (yAlign === 'center') {
        if (xAlign === 'left') {
          x += paddingAndSize;
        } else if (xAlign === 'right') {
          x -= paddingAndSize;
        }
      } else if (xAlign === 'left') {
        x -= radiusAndPadding;
      } else if (xAlign === 'right') {
        x += radiusAndPadding;
      }
  
      return {
        x: x,
        y: y
      };
    }
  
    function getAlignedX(vm, align) {
      return align === 'center'
          ? vm.x + vm.width / 2
          : align === 'right'
              ? vm.x + vm.width - vm.xPadding
              : vm.x + vm.xPadding;
    }
  
    /**
     * Helper to build before and after body lines
     */
    function getBeforeAfterBodyLines(callback) {
      return pushOrConcat([], splitNewlines(callback));
    }
  
    var exports$3 = core_element.extend({
      initialize: function () {
        this._model = getBaseModel(this._options);
        this._lastActive = [];
      },
  
      // Get the title
      // Args are: (tooltipItem, data)
      getTitle: function () {
        var me = this;
        var opts = me._options;
        var callbacks = opts.callbacks;
  
        var beforeTitle = callbacks.beforeTitle.apply(me, arguments);
        var title = callbacks.title.apply(me, arguments);
        var afterTitle = callbacks.afterTitle.apply(me, arguments);
  
        var lines = [];
        lines = pushOrConcat(lines, splitNewlines(beforeTitle));
        lines = pushOrConcat(lines, splitNewlines(title));
        lines = pushOrConcat(lines, splitNewlines(afterTitle));
  
        return lines;
      },
  
      // Args are: (tooltipItem, data)
      getBeforeBody: function () {
        return getBeforeAfterBodyLines(this._options.callbacks.beforeBody.apply(this, arguments));
      },
  
      // Args are: (tooltipItem, data)
      getBody: function (tooltipItems, data) {
        var me = this;
        var callbacks = me._options.callbacks;
        var bodyItems = [];
  
        helpers$1.each(tooltipItems, function (tooltipItem) {
          var bodyItem = {
            before: [],
            lines: [],
            after: []
          };
          pushOrConcat(bodyItem.before, splitNewlines(callbacks.beforeLabel.call(me, tooltipItem, data)));
          pushOrConcat(bodyItem.lines, callbacks.label.call(me, tooltipItem, data));
          pushOrConcat(bodyItem.after, splitNewlines(callbacks.afterLabel.call(me, tooltipItem, data)));
  
          bodyItems.push(bodyItem);
        });
  
        return bodyItems;
      },
  
      // Args are: (tooltipItem, data)
      getAfterBody: function () {
        return getBeforeAfterBodyLines(this._options.callbacks.afterBody.apply(this, arguments));
      },
  
      // Get the footer and beforeFooter and afterFooter lines
      // Args are: (tooltipItem, data)
      getFooter: function () {
        var me = this;
        var callbacks = me._options.callbacks;
  
        var beforeFooter = callbacks.beforeFooter.apply(me, arguments);
        var footer = callbacks.footer.apply(me, arguments);
        var afterFooter = callbacks.afterFooter.apply(me, arguments);
  
        var lines = [];
        lines = pushOrConcat(lines, splitNewlines(beforeFooter));
        lines = pushOrConcat(lines, splitNewlines(footer));
        lines = pushOrConcat(lines, splitNewlines(afterFooter));
  
        return lines;
      },
  
      update: function (changed) {
        var me = this;
        var opts = me._options;
  
        // Need to regenerate the model because its faster than using extend and it is necessary due to the optimization in Chart.Element.transition
        // that does _view = _model if ease === 1. This causes the 2nd tooltip update to set properties in both the view and model at the same time
        // which breaks any animations.
        var existingModel = me._model;
        var model = me._model = getBaseModel(opts);
        var active = me._active;
  
        var data = me._data;
  
        // In the case where active.length === 0 we need to keep these at existing values for good animations
        var alignment = {
          xAlign: existingModel.xAlign,
          yAlign: existingModel.yAlign
        };
        var backgroundPoint = {
          x: existingModel.x,
          y: existingModel.y
        };
        var tooltipSize = {
          width: existingModel.width,
          height: existingModel.height
        };
        var tooltipPosition = {
          x: existingModel.caretX,
          y: existingModel.caretY
        };
  
        var i, len;
  
        if (active.length) {
          model.opacity = 1;
  
          var labelColors = [];
          var labelTextColors = [];
          tooltipPosition = positioners[opts.position].call(me, active, me._eventPosition);
  
          var tooltipItems = [];
          for (i = 0, len = active.length; i < len; ++i) {
            tooltipItems.push(createTooltipItem(active[i]));
          }
  
          // If the user provided a filter function, use it to modify the tooltip items
          if (opts.filter) {
            tooltipItems = tooltipItems.filter(function (a) {
              return opts.filter(a, data);
            });
          }
  
          // If the user provided a sorting function, use it to modify the tooltip items
          if (opts.itemSort) {
            tooltipItems = tooltipItems.sort(function (a, b) {
              return opts.itemSort(a, b, data);
            });
          }
  
          // Determine colors for boxes
          helpers$1.each(tooltipItems, function (tooltipItem) {
            labelColors.push(opts.callbacks.labelColor.call(me, tooltipItem, me._chart));
            labelTextColors.push(opts.callbacks.labelTextColor.call(me, tooltipItem, me._chart));
          });
  
  
          // Build the Text Lines
          model.title = me.getTitle(tooltipItems, data);
          model.beforeBody = me.getBeforeBody(tooltipItems, data);
          model.body = me.getBody(tooltipItems, data);
          model.afterBody = me.getAfterBody(tooltipItems, data);
          model.footer = me.getFooter(tooltipItems, data);
  
          // Initial positioning and colors
          model.x = tooltipPosition.x;
          model.y = tooltipPosition.y;
          model.caretPadding = opts.caretPadding;
          model.labelColors = labelColors;
          model.labelTextColors = labelTextColors;
  
          // data points
          model.dataPoints = tooltipItems;
  
          // We need to determine alignment of the tooltip
          tooltipSize = getTooltipSize(this, model);
          alignment = determineAlignment(this, tooltipSize);
          // Final Size and Position
          backgroundPoint = getBackgroundPoint(model, tooltipSize, alignment, me._chart);
        } else {
          model.opacity = 0;
        }
  
        model.xAlign = alignment.xAlign;
        model.yAlign = alignment.yAlign;
        model.x = backgroundPoint.x;
        model.y = backgroundPoint.y;
        model.width = tooltipSize.width;
        model.height = tooltipSize.height;
  
        // Point where the caret on the tooltip points to
        model.caretX = tooltipPosition.x;
        model.caretY = tooltipPosition.y;
  
        me._model = model;
  
        if (changed && opts.custom) {
          opts.custom.call(me, model);
        }
  
        return me;
      },
  
      drawCaret: function (tooltipPoint, size) {
        var ctx = this._chart.ctx;
        var vm = this._view;
        var caretPosition = this.getCaretPosition(tooltipPoint, size, vm);
  
        ctx.lineTo(caretPosition.x1, caretPosition.y1);
        ctx.lineTo(caretPosition.x2, caretPosition.y2);
        ctx.lineTo(caretPosition.x3, caretPosition.y3);
      },
      getCaretPosition: function (tooltipPoint, size, vm) {
        var x1, x2, x3, y1, y2, y3;
        var caretSize = vm.caretSize;
        var cornerRadius = vm.cornerRadius;
        var xAlign = vm.xAlign;
        var yAlign = vm.yAlign;
        var ptX = tooltipPoint.x;
        var ptY = tooltipPoint.y;
        var width = size.width;
        var height = size.height;
  
        if (yAlign === 'center') {
          y2 = ptY + (height / 2);
  
          if (xAlign === 'left') {
            x1 = ptX;
            x2 = x1 - caretSize;
            x3 = x1;
  
            y1 = y2 + caretSize;
            y3 = y2 - caretSize;
          } else {
            x1 = ptX + width;
            x2 = x1 + caretSize;
            x3 = x1;
  
            y1 = y2 - caretSize;
            y3 = y2 + caretSize;
          }
        } else {
          if (xAlign === 'left') {
            x2 = ptX + cornerRadius + (caretSize);
            x1 = x2 - caretSize;
            x3 = x2 + caretSize;
          } else if (xAlign === 'right') {
            x2 = ptX + width - cornerRadius - caretSize;
            x1 = x2 - caretSize;
            x3 = x2 + caretSize;
          } else {
            x2 = vm.caretX;
            x1 = x2 - caretSize;
            x3 = x2 + caretSize;
          }
          if (yAlign === 'top') {
            y1 = ptY;
            y2 = y1 - caretSize;
            y3 = y1;
          } else {
            y1 = ptY + height;
            y2 = y1 + caretSize;
            y3 = y1;
            // invert drawing order
            var tmp = x3;
            x3 = x1;
            x1 = tmp;
          }
        }
        return {x1: x1, x2: x2, x3: x3, y1: y1, y2: y2, y3: y3};
      },
  
      drawTitle: function (pt, vm, ctx) {
        var title = vm.title;
  
        if (title.length) {
          pt.x = getAlignedX(vm, vm._titleAlign);
  
          ctx.textAlign = vm._titleAlign;
          ctx.textBaseline = 'top';
  
          var titleFontSize = vm.titleFontSize;
          var titleSpacing = vm.titleSpacing;
  
          ctx.fillStyle = vm.titleFontColor;
          ctx.font = helpers$1.fontString(titleFontSize, vm._titleFontStyle, vm._titleFontFamily);
  
          var i, len;
          for (i = 0, len = title.length; i < len; ++i) {
            ctx.fillText(title[i], pt.x, pt.y);
            pt.y += titleFontSize + titleSpacing; // Line Height and spacing
  
            if (i + 1 === title.length) {
              pt.y += vm.titleMarginBottom - titleSpacing; // If Last, add margin, remove spacing
            }
          }
        }
      },
  
      drawBody: function (pt, vm, ctx) {
        var bodyFontSize = vm.bodyFontSize;
        var bodySpacing = vm.bodySpacing;
        var bodyAlign = vm._bodyAlign;
        var body = vm.body;
        var drawColorBoxes = vm.displayColors;
        var labelColors = vm.labelColors;
        var xLinePadding = 0;
        var colorX = drawColorBoxes ? getAlignedX(vm, 'left') : 0;
        var textColor;
  
        ctx.textAlign = bodyAlign;
        ctx.textBaseline = 'top';
        ctx.font = helpers$1.fontString(bodyFontSize, vm._bodyFontStyle, vm._bodyFontFamily);
  
        pt.x = getAlignedX(vm, bodyAlign);
  
        // Before Body
        var fillLineOfText = function (line) {
          ctx.fillText(line, pt.x + xLinePadding, pt.y);
          pt.y += bodyFontSize + bodySpacing;
        };
  
        // Before body lines
        ctx.fillStyle = vm.bodyFontColor;
        helpers$1.each(vm.beforeBody, fillLineOfText);
  
        xLinePadding = drawColorBoxes && bodyAlign !== 'right'
            ? bodyAlign === 'center' ? (bodyFontSize / 2 + 1) : (bodyFontSize + 2)
            : 0;
  
        // Draw body lines now
        helpers$1.each(body, function (bodyItem, i) {
          textColor = vm.labelTextColors[i];
          ctx.fillStyle = textColor;
          helpers$1.each(bodyItem.before, fillLineOfText);
  
          helpers$1.each(bodyItem.lines, function (line) {
            // Draw Legend-like boxes if needed
            if (drawColorBoxes) {
              // Fill a white rect so that colours merge nicely if the opacity is < 1
              ctx.fillStyle = vm.legendColorBackground;
              ctx.fillRect(colorX, pt.y, bodyFontSize, bodyFontSize);
  
              // Border
              ctx.lineWidth = 1;
              ctx.strokeStyle = labelColors[i].borderColor;
              ctx.strokeRect(colorX, pt.y, bodyFontSize, bodyFontSize);
  
              // Inner square
              ctx.fillStyle = labelColors[i].backgroundColor;
              ctx.fillRect(colorX + 1, pt.y + 1, bodyFontSize - 2, bodyFontSize - 2);
              ctx.fillStyle = textColor;
            }
  
            fillLineOfText(line);
          });
  
          helpers$1.each(bodyItem.after, fillLineOfText);
        });
  
        // Reset back to 0 for after body
        xLinePadding = 0;
  
        // After body lines
        helpers$1.each(vm.afterBody, fillLineOfText);
        pt.y -= bodySpacing; // Remove last body spacing
      },
  
      drawFooter: function (pt, vm, ctx) {
        var footer = vm.footer;
  
        if (footer.length) {
          pt.x = getAlignedX(vm, vm._footerAlign);
          pt.y += vm.footerMarginTop;
  
          ctx.textAlign = vm._footerAlign;
          ctx.textBaseline = 'top';
  
          ctx.fillStyle = vm.footerFontColor;
          ctx.font = helpers$1.fontString(vm.footerFontSize, vm._footerFontStyle, vm._footerFontFamily);
  
          helpers$1.each(footer, function (line) {
            ctx.fillText(line, pt.x, pt.y);
            pt.y += vm.footerFontSize + vm.footerSpacing;
          });
        }
      },
  
      drawBackground: function (pt, vm, ctx, tooltipSize) {
        ctx.fillStyle = vm.backgroundColor;
        ctx.strokeStyle = vm.borderColor;
        ctx.lineWidth = vm.borderWidth;
        var xAlign = vm.xAlign;
        var yAlign = vm.yAlign;
        var x = pt.x;
        var y = pt.y;
        var width = tooltipSize.width;
        var height = tooltipSize.height;
        var radius = vm.cornerRadius;
  
        ctx.beginPath();
        ctx.moveTo(x + radius, y);
        if (yAlign === 'top') {
          this.drawCaret(pt, tooltipSize);
        }
        ctx.lineTo(x + width - radius, y);
        ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
        if (yAlign === 'center' && xAlign === 'right') {
          this.drawCaret(pt, tooltipSize);
        }
        ctx.lineTo(x + width, y + height - radius);
        ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
        if (yAlign === 'bottom') {
          this.drawCaret(pt, tooltipSize);
        }
        ctx.lineTo(x + radius, y + height);
        ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
        if (yAlign === 'center' && xAlign === 'left') {
          this.drawCaret(pt, tooltipSize);
        }
        ctx.lineTo(x, y + radius);
        ctx.quadraticCurveTo(x, y, x + radius, y);
        ctx.closePath();
  
        ctx.fill();
  
        if (vm.borderWidth > 0) {
          ctx.stroke();
        }
      },
  
      draw: function () {
        var ctx = this._chart.ctx;
        var vm = this._view;
  
        if (vm.opacity === 0) {
          return;
        }
  
        var tooltipSize = {
          width: vm.width,
          height: vm.height
        };
        var pt = {
          x: vm.x,
          y: vm.y
        };
  
        // IE11/Edge does not like very small opacities, so snap to 0
        var opacity = Math.abs(vm.opacity < 1e-3) ? 0 : vm.opacity;
  
        // Truthy/falsey value for empty tooltip
        var hasTooltipContent = vm.title.length || vm.beforeBody.length || vm.body.length || vm.afterBody.length || vm.footer.length;
  
        if (this._options.enabled && hasTooltipContent) {
          ctx.save();
          ctx.globalAlpha = opacity;
  
          // Draw Background
          this.drawBackground(pt, vm, ctx, tooltipSize);
  
          // Draw Title, Body, and Footer
          pt.y += vm.yPadding;
  
          // Titles
          this.drawTitle(pt, vm, ctx);
  
          // Body
          this.drawBody(pt, vm, ctx);
  
          // Footer
          this.drawFooter(pt, vm, ctx);
  
          ctx.restore();
        }
      },
  
      /**
       * Handle an event
       * @private
       * @param {IEvent} event - The event to handle
       * @returns {boolean} true if the tooltip changed
       */
      handleEvent: function (e) {
        var me = this;
        var options = me._options;
        var changed = false;
  
        me._lastActive = me._lastActive || [];
  
        // Find Active Elements for tooltips
        if (e.type === 'mouseout') {
          me._active = [];
        } else {
          me._active = me._chart.getElementsAtEventForMode(e, options.mode, options);
        }
  
        // Remember Last Actives
        changed = !helpers$1.arrayEquals(me._active, me._lastActive);
  
        // Only handle target event on tooltip change
        if (changed) {
          me._lastActive = me._active;
  
          if (options.enabled || options.custom) {
            me._eventPosition = {
              x: e.x,
              y: e.y
            };
  
            me.update(true);
            me.pivot();
          }
        }
  
        return changed;
      }
    });
  
    /**
     * @namespace Chart.Tooltip.positioners
     */
    var positioners_1 = positioners;
  
    var core_tooltip = exports$3;
    core_tooltip.positioners = positioners_1;
  
    var valueOrDefault$8 = helpers$1.valueOrDefault;
  
    core_defaults._set('global', {
      elements: {},
      events: [
        'mousemove',
        'mouseout',
        'click',
        'touchstart',
        'touchmove'
      ],
      hover: {
        onHover: null,
        mode: 'nearest',
        intersect: true,
        animationDuration: 400
      },
      onClick: null,
      maintainAspectRatio: true,
      responsive: true,
      responsiveAnimationDuration: 0
    });
  
    /**
     * Recursively merge the given config objects representing the `scales` option
     * by incorporating scale defaults in `xAxes` and `yAxes` array items, then
     * returns a deep copy of the result, thus doesn't alter inputs.
     */
    function mergeScaleConfig(/* config objects ... */) {
      return helpers$1.merge({}, [].slice.call(arguments), {
        merger: function (key, target, source, options) {
          if (key === 'xAxes' || key === 'yAxes') {
            var slen = source[key].length;
            var i, type, scale;
  
            if (!target[key]) {
              target[key] = [];
            }
  
            for (i = 0; i < slen; ++i) {
              scale = source[key][i];
              type = valueOrDefault$8(scale.type, key === 'xAxes' ? 'category' : 'linear');
  
              if (i >= target[key].length) {
                target[key].push({});
              }
  
              if (!target[key][i].type || (scale.type && scale.type !== target[key][i].type)) {
                // new/untyped scale or type changed: let's apply the new defaults
                // then merge source scale to correctly overwrite the defaults.
                helpers$1.merge(target[key][i], [core_scaleService.getScaleDefaults(type), scale]);
              } else {
                // scales type are the same
                helpers$1.merge(target[key][i], scale);
              }
            }
          } else {
            helpers$1._merger(key, target, source, options);
          }
        }
      });
    }
  
    /**
     * Recursively merge the given config objects as the root options by handling
     * default scale options for the `scales` and `scale` properties, then returns
     * a deep copy of the result, thus doesn't alter inputs.
     */
    function mergeConfig(/* config objects ... */) {
      return helpers$1.merge({}, [].slice.call(arguments), {
        merger: function (key, target, source, options) {
          var tval = target[key] || {};
          var sval = source[key];
  
          if (key === 'scales') {
            // scale config merging is complex. Add our own function here for that
            target[key] = mergeScaleConfig(tval, sval);
          } else if (key === 'scale') {
            // used in polar area & radar charts since there is only one scale
            target[key] = helpers$1.merge(tval, [core_scaleService.getScaleDefaults(sval.type), sval]);
          } else {
            helpers$1._merger(key, target, source, options);
          }
        }
      });
    }
  
    function initConfig(config) {
      config = config || {};
  
      // Do NOT use mergeConfig for the data object because this method merges arrays
      // and so would change references to labels and datasets, preventing data updates.
      var data = config.data = config.data || {};
      data.datasets = data.datasets || [];
      data.labels = data.labels || [];
  
      config.options = mergeConfig(
          core_defaults.global,
          core_defaults[config.type],
          config.options || {});
  
      return config;
    }
  
    function updateConfig(chart) {
      var newOptions = chart.options;
  
      helpers$1.each(chart.scales, function (scale) {
        core_layouts.removeBox(chart, scale);
      });
  
      newOptions = mergeConfig(
          core_defaults.global,
          core_defaults[chart.config.type],
          newOptions);
  
      chart.options = chart.config.options = newOptions;
      chart.ensureScalesHaveIDs();
      chart.buildOrUpdateScales();
  
      // Tooltip
      chart.tooltip._options = newOptions.tooltips;
      chart.tooltip.initialize();
    }
  
    function positionIsHorizontal(position) {
      return position === 'top' || position === 'bottom';
    }
  
    var Chart = function (item, config) {
      this.construct(item, config);
      return this;
    };
  
    helpers$1.extend(Chart.prototype, /** @lends Chart */ {
      /**
       * @private
       */
      construct: function (item, config) {
        var me = this;
  
        config = initConfig(config);
  
        var context = platform.acquireContext(item, config);
        var canvas = context && context.canvas;
        var height = canvas && canvas.height;
        var width = canvas && canvas.width;
  
        me.id = helpers$1.uid();
        me.ctx = context;
        me.canvas = canvas;
        me.config = config;
        me.width = width;
        me.height = height;
        me.aspectRatio = height ? width / height : null;
        me.options = config.options;
        me._bufferedRender = false;
  
        /**
         * Provided for backward compatibility, Chart and Chart.Controller have been merged,
         * the "instance" still need to be defined since it might be called from plugins.
         * @prop Chart#chart
         * @deprecated since version 2.6.0
         * @todo remove at version 3
         * @private
         */
        me.chart = me;
        me.controller = me; // chart.chart.controller #inception
  
        // Add the chart instance to the global namespace
        Chart.instances[me.id] = me;
  
        // Define alias to the config data: `chart.data === chart.config.data`
        Object.defineProperty(me, 'data', {
          get: function () {
            return me.config.data;
          },
          set: function (value) {
            me.config.data = value;
          }
        });
  
        if (!context || !canvas) {
          // The given item is not a compatible context2d element, let's return before finalizing
          // the chart initialization but after setting basic chart / controller properties that
          // can help to figure out that the chart is not valid (e.g chart.canvas !== null);
          // https://github.com/chartjs/Chart.js/issues/2807
          console.error("Failed to create chart: can't acquire context from the given item");
          return;
        }
  
        me.initialize();
        me.update();
      },
  
      /**
       * @private
       */
      initialize: function () {
        var me = this;
  
        // Before init plugin notification
        core_plugins.notify(me, 'beforeInit');
  
        helpers$1.retinaScale(me, me.options.devicePixelRatio);
  
        me.bindEvents();
  
        if (me.options.responsive) {
          // Initial resize before chart draws (must be silent to preserve initial animations).
          me.resize(true);
        }
  
        // Make sure scales have IDs and are built before we build any controllers.
        me.ensureScalesHaveIDs();
        me.buildOrUpdateScales();
        me.initToolTip();
  
        // After init plugin notification
        core_plugins.notify(me, 'afterInit');
  
        return me;
      },
  
      clear: function () {
        helpers$1.canvas.clear(this);
        return this;
      },
  
      stop: function () {
        // Stops any current animation loop occurring
        core_animations.cancelAnimation(this);
        return this;
      },
  
      resize: function (silent) {
        var me = this;
        var options = me.options;
        var canvas = me.canvas;
        var aspectRatio = (options.maintainAspectRatio && me.aspectRatio) || null;
  
        // the canvas render width and height will be casted to integers so make sure that
        // the canvas display style uses the same integer values to avoid blurring effect.
  
        // Set to 0 instead of canvas.size because the size defaults to 300x150 if the element is collapsed
        var newWidth = Math.max(0, Math.floor(helpers$1.getMaximumWidth(canvas)));
        var newHeight = Math.max(0, Math.floor(aspectRatio ? newWidth / aspectRatio : helpers$1.getMaximumHeight(canvas)));
  
        if (me.width === newWidth && me.height === newHeight) {
          return;
        }
  
        canvas.width = me.width = newWidth;
        canvas.height = me.height = newHeight;
        canvas.style.width = newWidth + 'px';
        canvas.style.height = newHeight + 'px';
  
        helpers$1.retinaScale(me, options.devicePixelRatio);
  
        if (!silent) {
          // Notify any plugins about the resize
          var newSize = {width: newWidth, height: newHeight};
          core_plugins.notify(me, 'resize', [newSize]);
  
          // Notify of resize
          if (options.onResize) {
            options.onResize(me, newSize);
          }
  
          me.stop();
          me.update({
            duration: options.responsiveAnimationDuration
          });
        }
      },
  
      ensureScalesHaveIDs: function () {
        var options = this.options;
        var scalesOptions = options.scales || {};
        var scaleOptions = options.scale;
  
        helpers$1.each(scalesOptions.xAxes, function (xAxisOptions, index) {
          xAxisOptions.id = xAxisOptions.id || ('x-axis-' + index);
        });
  
        helpers$1.each(scalesOptions.yAxes, function (yAxisOptions, index) {
          yAxisOptions.id = yAxisOptions.id || ('y-axis-' + index);
        });
  
        if (scaleOptions) {
          scaleOptions.id = scaleOptions.id || 'scale';
        }
      },
  
      /**
       * Builds a map of scale ID to scale object for future lookup.
       */
      buildOrUpdateScales: function () {
        var me = this;
        var options = me.options;
        var scales = me.scales || {};
        var items = [];
        var updated = Object.keys(scales).reduce(function (obj, id) {
          obj[id] = false;
          return obj;
        }, {});
  
        if (options.scales) {
          items = items.concat(
              (options.scales.xAxes || []).map(function (xAxisOptions) {
                return {options: xAxisOptions, dtype: 'category', dposition: 'bottom'};
              }),
              (options.scales.yAxes || []).map(function (yAxisOptions) {
                return {options: yAxisOptions, dtype: 'linear', dposition: 'left'};
              })
          );
        }
  
        if (options.scale) {
          items.push({
            options: options.scale,
            dtype: 'radialLinear',
            isDefault: true,
            dposition: 'chartArea'
          });
        }
  
        helpers$1.each(items, function (item) {
          var scaleOptions = item.options;
          var id = scaleOptions.id;
          var scaleType = valueOrDefault$8(scaleOptions.type, item.dtype);
  
          if (positionIsHorizontal(scaleOptions.position) !== positionIsHorizontal(item.dposition)) {
            scaleOptions.position = item.dposition;
          }
  
          updated[id] = true;
          var scale = null;
          if (id in scales && scales[id].type === scaleType) {
            scale = scales[id];
            scale.options = scaleOptions;
            scale.ctx = me.ctx;
            scale.chart = me;
          } else {
            var scaleClass = core_scaleService.getScaleConstructor(scaleType);
            if (!scaleClass) {
              return;
            }
            scale = new scaleClass({
              id: id,
              type: scaleType,
              options: scaleOptions,
              ctx: me.ctx,
              chart: me
            });
            scales[scale.id] = scale;
          }
  
          scale.mergeTicksOptions();
  
          // TODO(SB): I think we should be able to remove this custom case (options.scale)
          // and consider it as a regular scale part of the "scales"" map only! This would
          // make the logic easier and remove some useless? custom code.
          if (item.isDefault) {
            me.scale = scale;
          }
        });
        // clear up discarded scales
        helpers$1.each(updated, function (hasUpdated, id) {
          if (!hasUpdated) {
            delete scales[id];
          }
        });
  
        me.scales = scales;
  
        core_scaleService.addScalesToLayout(this);
      },
  
      buildOrUpdateControllers: function () {
        var me = this;
        var newControllers = [];
  
        helpers$1.each(me.data.datasets, function (dataset, datasetIndex) {
          var meta = me.getDatasetMeta(datasetIndex);
          var type = dataset.type || me.config.type;
  
          if (meta.type && meta.type !== type) {
            me.destroyDatasetMeta(datasetIndex);
            meta = me.getDatasetMeta(datasetIndex);
          }
          meta.type = type;
  
          if (meta.controller) {
            meta.controller.updateIndex(datasetIndex);
            meta.controller.linkScales();
          } else {
            var ControllerClass = controllers[meta.type];
            if (ControllerClass === undefined) {
              throw new Error('"' + meta.type + '" is not a chart type.');
            }
  
            meta.controller = new ControllerClass(me, datasetIndex);
            newControllers.push(meta.controller);
          }
        }, me);
  
        return newControllers;
      },
  
      /**
       * Reset the elements of all datasets
       * @private
       */
      resetElements: function () {
        var me = this;
        helpers$1.each(me.data.datasets, function (dataset, datasetIndex) {
          me.getDatasetMeta(datasetIndex).controller.reset();
        }, me);
      },
  
      /**
       * Resets the chart back to it's state before the initial animation
       */
      reset: function () {
        this.resetElements();
        this.tooltip.initialize();
      },
  
      update: function (config) {
        var me = this;
  
        if (!config || typeof config !== 'object') {
          // backwards compatibility
          config = {
            duration: config,
            lazy: arguments[1]
          };
        }
  
        updateConfig(me);
  
        // plugins options references might have change, let's invalidate the cache
        // https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
        core_plugins._invalidate(me);
  
        if (core_plugins.notify(me, 'beforeUpdate') === false) {
          return;
        }
  
        // In case the entire data object changed
        me.tooltip._data = me.data;
  
        // Make sure dataset controllers are updated and new controllers are reset
        var newControllers = me.buildOrUpdateControllers();
  
        // Make sure all dataset controllers have correct meta data counts
        helpers$1.each(me.data.datasets, function (dataset, datasetIndex) {
          me.getDatasetMeta(datasetIndex).controller.buildOrUpdateElements();
        }, me);
  
        me.updateLayout();
  
        // Can only reset the new controllers after the scales have been updated
        if (me.options.animation && me.options.animation.duration) {
          helpers$1.each(newControllers, function (controller) {
            controller.reset();
          });
        }
  
        me.updateDatasets();
  
        // Need to reset tooltip in case it is displayed with elements that are removed
        // after update.
        me.tooltip.initialize();
  
        // Last active contains items that were previously in the tooltip.
        // When we reset the tooltip, we need to clear it
        me.lastActive = [];
  
        // Do this before render so that any plugins that need final scale updates can use it
        core_plugins.notify(me, 'afterUpdate');
  
        if (me._bufferedRender) {
          me._bufferedRequest = {
            duration: config.duration,
            easing: config.easing,
            lazy: config.lazy
          };
        } else {
          me.render(config);
        }
      },
  
      /**
       * Updates the chart layout unless a plugin returns `false` to the `beforeLayout`
       * hook, in which case, plugins will not be called on `afterLayout`.
       * @private
       */
      updateLayout: function () {
        var me = this;
  
        if (core_plugins.notify(me, 'beforeLayout') === false) {
          return;
        }
  
        core_layouts.update(this, this.width, this.height);
  
        /**
         * Provided for backward compatibility, use `afterLayout` instead.
         * @method IPlugin#afterScaleUpdate
         * @deprecated since version 2.5.0
         * @todo remove at version 3
         * @private
         */
        core_plugins.notify(me, 'afterScaleUpdate');
        core_plugins.notify(me, 'afterLayout');
      },
  
      /**
       * Updates all datasets unless a plugin returns `false` to the `beforeDatasetsUpdate`
       * hook, in which case, plugins will not be called on `afterDatasetsUpdate`.
       * @private
       */
      updateDatasets: function () {
        var me = this;
  
        if (core_plugins.notify(me, 'beforeDatasetsUpdate') === false) {
          return;
        }
  
        for (var i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
          me.updateDataset(i);
        }
  
        core_plugins.notify(me, 'afterDatasetsUpdate');
      },
  
      /**
       * Updates dataset at index unless a plugin returns `false` to the `beforeDatasetUpdate`
       * hook, in which case, plugins will not be called on `afterDatasetUpdate`.
       * @private
       */
      updateDataset: function (index) {
        var me = this;
        var meta = me.getDatasetMeta(index);
        var args = {
          meta: meta,
          index: index
        };
  
        if (core_plugins.notify(me, 'beforeDatasetUpdate', [args]) === false) {
          return;
        }
  
        meta.controller.update();
  
        core_plugins.notify(me, 'afterDatasetUpdate', [args]);
      },
  
      render: function (config) {
        var me = this;
  
        if (!config || typeof config !== 'object') {
          // backwards compatibility
          config = {
            duration: config,
            lazy: arguments[1]
          };
        }
  
        var animationOptions = me.options.animation;
        var duration = valueOrDefault$8(config.duration, animationOptions && animationOptions.duration);
        var lazy = config.lazy;
  
        if (core_plugins.notify(me, 'beforeRender') === false) {
          return;
        }
  
        var onComplete = function (animation) {
          core_plugins.notify(me, 'afterRender');
          helpers$1.callback(animationOptions && animationOptions.onComplete, [animation], me);
        };
  
        if (animationOptions && duration) {
          var animation = new core_animation({
            numSteps: duration / 16.66, // 60 fps
            easing: config.easing || animationOptions.easing,
  
            render: function (chart, animationObject) {
              var easingFunction = helpers$1.easing.effects[animationObject.easing];
              var currentStep = animationObject.currentStep;
              var stepDecimal = currentStep / animationObject.numSteps;
  
              chart.draw(easingFunction(stepDecimal), stepDecimal, currentStep);
            },
  
            onAnimationProgress: animationOptions.onProgress,
            onAnimationComplete: onComplete
          });
  
          core_animations.addAnimation(me, animation, duration, lazy);
        } else {
          me.draw();
  
          // See https://github.com/chartjs/Chart.js/issues/3781
          onComplete(new core_animation({numSteps: 0, chart: me}));
        }
  
        return me;
      },
  
      draw: function (easingValue) {
        var me = this;
  
        me.clear();
  
        if (helpers$1.isNullOrUndef(easingValue)) {
          easingValue = 1;
        }
  
        me.transition(easingValue);
  
        if (me.width <= 0 || me.height <= 0) {
          return;
        }
  
        if (core_plugins.notify(me, 'beforeDraw', [easingValue]) === false) {
          return;
        }
  
        // Draw all the scales
        helpers$1.each(me.boxes, function (box) {
          box.draw(me.chartArea);
        }, me);
  
        me.drawDatasets(easingValue);
        me._drawTooltip(easingValue);
  
        core_plugins.notify(me, 'afterDraw', [easingValue]);
      },
  
      /**
       * @private
       */
      transition: function (easingValue) {
        var me = this;
  
        for (var i = 0, ilen = (me.data.datasets || []).length; i < ilen; ++i) {
          if (me.isDatasetVisible(i)) {
            me.getDatasetMeta(i).controller.transition(easingValue);
          }
        }
  
        me.tooltip.transition(easingValue);
      },
  
      /**
       * Draws all datasets unless a plugin returns `false` to the `beforeDatasetsDraw`
       * hook, in which case, plugins will not be called on `afterDatasetsDraw`.
       * @private
       */
      drawDatasets: function (easingValue) {
        var me = this;
  
        if (core_plugins.notify(me, 'beforeDatasetsDraw', [easingValue]) === false) {
          return;
        }
  
        // Draw datasets reversed to support proper line stacking
        for (var i = (me.data.datasets || []).length - 1; i >= 0; --i) {
          if (me.isDatasetVisible(i)) {
            me.drawDataset(i, easingValue);
          }
        }
  
        core_plugins.notify(me, 'afterDatasetsDraw', [easingValue]);
      },
  
      /**
       * Draws dataset at index unless a plugin returns `false` to the `beforeDatasetDraw`
       * hook, in which case, plugins will not be called on `afterDatasetDraw`.
       * @private
       */
      drawDataset: function (index, easingValue) {
        var me = this;
        var meta = me.getDatasetMeta(index);
        var args = {
          meta: meta,
          index: index,
          easingValue: easingValue
        };
  
        if (core_plugins.notify(me, 'beforeDatasetDraw', [args]) === false) {
          return;
        }
  
        meta.controller.draw(easingValue);
  
        core_plugins.notify(me, 'afterDatasetDraw', [args]);
      },
  
      /**
       * Draws tooltip unless a plugin returns `false` to the `beforeTooltipDraw`
       * hook, in which case, plugins will not be called on `afterTooltipDraw`.
       * @private
       */
      _drawTooltip: function (easingValue) {
        var me = this;
        var tooltip = me.tooltip;
        var args = {
          tooltip: tooltip,
          easingValue: easingValue
        };
  
        if (core_plugins.notify(me, 'beforeTooltipDraw', [args]) === false) {
          return;
        }
  
        tooltip.draw();
  
        core_plugins.notify(me, 'afterTooltipDraw', [args]);
      },
  
      /**
       * Get the single element that was clicked on
       * @return An object containing the dataset index and element index of the matching element. Also contains the rectangle that was draw
       */
      getElementAtEvent: function (e) {
        return core_interaction.modes.single(this, e);
      },
  
      getElementsAtEvent: function (e) {
        return core_interaction.modes.label(this, e, {intersect: true});
      },
  
      getElementsAtXAxis: function (e) {
        return core_interaction.modes['x-axis'](this, e, {intersect: true});
      },
  
      getElementsAtEventForMode: function (e, mode, options) {
        var method = core_interaction.modes[mode];
        if (typeof method === 'function') {
          return method(this, e, options);
        }
  
        return [];
      },
  
      getDatasetAtEvent: function (e) {
        return core_interaction.modes.dataset(this, e, {intersect: true});
      },
  
      getDatasetMeta: function (datasetIndex) {
        var me = this;
        var dataset = me.data.datasets[datasetIndex];
        if (!dataset._meta) {
          dataset._meta = {};
        }
  
        var meta = dataset._meta[me.id];
        if (!meta) {
          meta = dataset._meta[me.id] = {
            type: null,
            data: [],
            dataset: null,
            controller: null,
            hidden: null,			// See isDatasetVisible() comment
            xAxisID: null,
            yAxisID: null
          };
        }
  
        return meta;
      },
  
      getVisibleDatasetCount: function () {
        var count = 0;
        for (var i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
          if (this.isDatasetVisible(i)) {
            count++;
          }
        }
        return count;
      },
  
      isDatasetVisible: function (datasetIndex) {
        var meta = this.getDatasetMeta(datasetIndex);
  
        // meta.hidden is a per chart dataset hidden flag override with 3 states: if true or false,
        // the dataset.hidden value is ignored, else if null, the dataset hidden state is returned.
        return typeof meta.hidden === 'boolean' ? !meta.hidden : !this.data.datasets[datasetIndex].hidden;
      },
  
      generateLegend: function () {
        return this.options.legendCallback(this);
      },
  
      /**
       * @private
       */
      destroyDatasetMeta: function (datasetIndex) {
        var id = this.id;
        var dataset = this.data.datasets[datasetIndex];
        var meta = dataset._meta && dataset._meta[id];
  
        if (meta) {
          meta.controller.destroy();
          delete dataset._meta[id];
        }
      },
  
      destroy: function () {
        var me = this;
        var canvas = me.canvas;
        var i, ilen;
  
        me.stop();
  
        // dataset controllers need to cleanup associated data
        for (i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
          me.destroyDatasetMeta(i);
        }
  
        if (canvas) {
          me.unbindEvents();
          helpers$1.canvas.clear(me);
          platform.releaseContext(me.ctx);
          me.canvas = null;
          me.ctx = null;
        }
  
        core_plugins.notify(me, 'destroy');
  
        delete Chart.instances[me.id];
      },
  
      toBase64Image: function () {
        return this.canvas.toDataURL.apply(this.canvas, arguments);
      },
  
      initToolTip: function () {
        var me = this;
        me.tooltip = new core_tooltip({
          _chart: me,
          _chartInstance: me, // deprecated, backward compatibility
          _data: me.data,
          _options: me.options.tooltips
        }, me);
      },
  
      /**
       * @private
       */
      bindEvents: function () {
        var me = this;
        var listeners = me._listeners = {};
        var listener = function () {
          me.eventHandler.apply(me, arguments);
        };
  
        helpers$1.each(me.options.events, function (type) {
          platform.addEventListener(me, type, listener);
          listeners[type] = listener;
        });
  
        // Elements used to detect size change should not be injected for non responsive charts.
        // See https://github.com/chartjs/Chart.js/issues/2210
        if (me.options.responsive) {
          listener = function () {
            me.resize();
          };
  
          platform.addEventListener(me, 'resize', listener);
          listeners.resize = listener;
        }
      },
  
      /**
       * @private
       */
      unbindEvents: function () {
        var me = this;
        var listeners = me._listeners;
        if (!listeners) {
          return;
        }
  
        delete me._listeners;
        helpers$1.each(listeners, function (listener, type) {
          platform.removeEventListener(me, type, listener);
        });
      },
  
      updateHoverStyle: function (elements, mode, enabled) {
        var method = enabled ? 'setHoverStyle' : 'removeHoverStyle';
        var element, i, ilen;
  
        for (i = 0, ilen = elements.length; i < ilen; ++i) {
          element = elements[i];
          if (element) {
            this.getDatasetMeta(element._datasetIndex).controller[method](element);
          }
        }
      },
  
      /**
       * @private
       */
      eventHandler: function (e) {
        var me = this;
        var tooltip = me.tooltip;
  
        if (core_plugins.notify(me, 'beforeEvent', [e]) === false) {
          return;
        }
  
        // Buffer any update calls so that renders do not occur
        me._bufferedRender = true;
        me._bufferedRequest = null;
  
        var changed = me.handleEvent(e);
        // for smooth tooltip animations issue #4989
        // the tooltip should be the source of change
        // Animation check workaround:
        // tooltip._start will be null when tooltip isn't animating
        if (tooltip) {
          changed = tooltip._start
              ? tooltip.handleEvent(e)
              : changed | tooltip.handleEvent(e);
        }
  
        core_plugins.notify(me, 'afterEvent', [e]);
  
        var bufferedRequest = me._bufferedRequest;
        if (bufferedRequest) {
          // If we have an update that was triggered, we need to do a normal render
          me.render(bufferedRequest);
        } else if (changed && !me.animating) {
          // If entering, leaving, or changing elements, animate the change via pivot
          me.stop();
  
          // We only need to render at this point. Updating will cause scales to be
          // recomputed generating flicker & using more memory than necessary.
          me.render({
            duration: me.options.hover.animationDuration,
            lazy: true
          });
        }
  
        me._bufferedRender = false;
        me._bufferedRequest = null;
  
        return me;
      },
  
      /**
       * Handle an event
       * @private
       * @param {IEvent} event the event to handle
       * @return {boolean} true if the chart needs to re-render
       */
      handleEvent: function (e) {
        var me = this;
        var options = me.options || {};
        var hoverOptions = options.hover;
        var changed = false;
  
        me.lastActive = me.lastActive || [];
  
        // Find Active Elements for hover and tooltips
        if (e.type === 'mouseout') {
          me.active = [];
        } else {
          me.active = me.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions);
        }
  
        // Invoke onHover hook
        // Need to call with native event here to not break backwards compatibility
        helpers$1.callback(options.onHover || options.hover.onHover, [e.native, me.active], me);
  
        if (e.type === 'mouseup' || e.type === 'click') {
          if (options.onClick) {
            // Use e.native here for backwards compatibility
            options.onClick.call(me, e.native, me.active);
          }
        }
  
        // Remove styling for last active (even if it may still be active)
        if (me.lastActive.length) {
          me.updateHoverStyle(me.lastActive, hoverOptions.mode, false);
        }
  
        // Built in hover styling
        if (me.active.length && hoverOptions.mode) {
          me.updateHoverStyle(me.active, hoverOptions.mode, true);
        }
  
        changed = !helpers$1.arrayEquals(me.active, me.lastActive);
  
        // Remember Last Actives
        me.lastActive = me.active;
  
        return changed;
      }
    });
  
    /**
     * NOTE(SB) We actually don't use this container anymore but we need to keep it
     * for backward compatibility. Though, it can still be useful for plugins that
     * would need to work on multiple charts?!
     */
    Chart.instances = {};
  
    var core_controller = Chart;
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, use Chart instead.
     * @class Chart.Controller
     * @deprecated since version 2.6
     * @todo remove at version 3
     * @private
     */
    Chart.Controller = Chart;
  
    /**
     * Provided for backward compatibility, not available anymore.
     * @namespace Chart
     * @deprecated since version 2.8
     * @todo remove at version 3
     * @private
     */
    Chart.types = {};
  
    /**
     * Provided for backward compatibility, not available anymore.
     * @namespace Chart.helpers.configMerge
     * @deprecated since version 2.8.0
     * @todo remove at version 3
     * @private
     */
    helpers$1.configMerge = mergeConfig;
  
    /**
     * Provided for backward compatibility, not available anymore.
     * @namespace Chart.helpers.scaleMerge
     * @deprecated since version 2.8.0
     * @todo remove at version 3
     * @private
     */
    helpers$1.scaleMerge = mergeScaleConfig;
  
    var core_helpers = function () {
  
      // -- Basic js utility methods
  
      helpers$1.where = function (collection, filterCallback) {
        if (helpers$1.isArray(collection) && Array.prototype.filter) {
          return collection.filter(filterCallback);
        }
        var filtered = [];
  
        helpers$1.each(collection, function (item) {
          if (filterCallback(item)) {
            filtered.push(item);
          }
        });
  
        return filtered;
      };
      helpers$1.findIndex = Array.prototype.findIndex ?
          function (array, callback, scope) {
            return array.findIndex(callback, scope);
          } :
          function (array, callback, scope) {
            scope = scope === undefined ? array : scope;
            for (var i = 0, ilen = array.length; i < ilen; ++i) {
              if (callback.call(scope, array[i], i, array)) {
                return i;
              }
            }
            return -1;
          };
      helpers$1.findNextWhere = function (arrayToSearch, filterCallback, startIndex) {
        // Default to start of the array
        if (helpers$1.isNullOrUndef(startIndex)) {
          startIndex = -1;
        }
        for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
          var currentItem = arrayToSearch[i];
          if (filterCallback(currentItem)) {
            return currentItem;
          }
        }
      };
      helpers$1.findPreviousWhere = function (arrayToSearch, filterCallback, startIndex) {
        // Default to end of the array
        if (helpers$1.isNullOrUndef(startIndex)) {
          startIndex = arrayToSearch.length;
        }
        for (var i = startIndex - 1; i >= 0; i--) {
          var currentItem = arrayToSearch[i];
          if (filterCallback(currentItem)) {
            return currentItem;
          }
        }
      };
  
      // -- Math methods
      helpers$1.isNumber = function (n) {
        return !isNaN(parseFloat(n)) && isFinite(n);
      };
      helpers$1.almostEquals = function (x, y, epsilon) {
        return Math.abs(x - y) < epsilon;
      };
      helpers$1.almostWhole = function (x, epsilon) {
        var rounded = Math.round(x);
        return (((rounded - epsilon) < x) && ((rounded + epsilon) > x));
      };
      helpers$1.max = function (array) {
        return array.reduce(function (max, value) {
          if (!isNaN(value)) {
            return Math.max(max, value);
          }
          return max;
        }, Number.NEGATIVE_INFINITY);
      };
      helpers$1.min = function (array) {
        return array.reduce(function (min, value) {
          if (!isNaN(value)) {
            return Math.min(min, value);
          }
          return min;
        }, Number.POSITIVE_INFINITY);
      };
      helpers$1.sign = Math.sign ?
          function (x) {
            return Math.sign(x);
          } :
          function (x) {
            x = +x; // convert to a number
            if (x === 0 || isNaN(x)) {
              return x;
            }
            return x > 0 ? 1 : -1;
          };
      helpers$1.log10 = Math.log10 ?
          function (x) {
            return Math.log10(x);
          } :
          function (x) {
            var exponent = Math.log(x) * Math.LOG10E; // Math.LOG10E = 1 / Math.LN10.
            // Check for whole powers of 10,
            // which due to floating point rounding error should be corrected.
            var powerOf10 = Math.round(exponent);
            var isPowerOf10 = x === Math.pow(10, powerOf10);
  
            return isPowerOf10 ? powerOf10 : exponent;
          };
      helpers$1.toRadians = function (degrees) {
        return degrees * (Math.PI / 180);
      };
      helpers$1.toDegrees = function (radians) {
        return radians * (180 / Math.PI);
      };
  
      /**
       * Returns the number of decimal places
       * i.e. the number of digits after the decimal point, of the value of this Number.
       * @param {number} x - A number.
       * @returns {number} The number of decimal places.
       * @private
       */
      helpers$1._decimalPlaces = function (x) {
        if (!helpers$1.isFinite(x)) {
          return;
        }
        var e = 1;
        var p = 0;
        while (Math.round(x * e) / e !== x) {
          e *= 10;
          p++;
        }
        return p;
      };
  
      // Gets the angle from vertical upright to the point about a centre.
      helpers$1.getAngleFromPoint = function (centrePoint, anglePoint) {
        var distanceFromXCenter = anglePoint.x - centrePoint.x;
        var distanceFromYCenter = anglePoint.y - centrePoint.y;
        var radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
  
        var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
  
        if (angle < (-0.5 * Math.PI)) {
          angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
        }
  
        return {
          angle: angle,
          distance: radialDistanceFromCenter
        };
      };
      helpers$1.distanceBetweenPoints = function (pt1, pt2) {
        return Math.sqrt(Math.pow(pt2.x - pt1.x, 2) + Math.pow(pt2.y - pt1.y, 2));
      };
  
      /**
       * Provided for backward compatibility, not available anymore
       * @function Chart.helpers.aliasPixel
       * @deprecated since version 2.8.0
       * @todo remove at version 3
       */
      helpers$1.aliasPixel = function (pixelWidth) {
        return (pixelWidth % 2 === 0) ? 0 : 0.5;
      };
  
      /**
       * Returns the aligned pixel value to avoid anti-aliasing blur
       * @param {Chart} chart - The chart instance.
       * @param {number} pixel - A pixel value.
       * @param {number} width - The width of the element.
       * @returns {number} The aligned pixel value.
       * @private
       */
      helpers$1._alignPixel = function (chart, pixel, width) {
        var devicePixelRatio = chart.currentDevicePixelRatio;
        var halfWidth = width / 2;
        return Math.round((pixel - halfWidth) * devicePixelRatio) / devicePixelRatio + halfWidth;
      };
  
      helpers$1.splineCurve = function (firstPoint, middlePoint, afterPoint, t) {
        // Props to Rob Spencer at scaled innovation for his post on splining between points
        // http://scaledinnovation.com/analytics/splines/aboutSplines.html
  
        // This function must also respect "skipped" points
  
        var previous = firstPoint.skip ? middlePoint : firstPoint;
        var current = middlePoint;
        var next = afterPoint.skip ? middlePoint : afterPoint;
  
        var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
        var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));
  
        var s01 = d01 / (d01 + d12);
        var s12 = d12 / (d01 + d12);
  
        // If all points are the same, s01 & s02 will be inf
        s01 = isNaN(s01) ? 0 : s01;
        s12 = isNaN(s12) ? 0 : s12;
  
        var fa = t * s01; // scaling factor for triangle Ta
        var fb = t * s12;
  
        return {
          previous: {
            x: current.x - fa * (next.x - previous.x),
            y: current.y - fa * (next.y - previous.y)
          },
          next: {
            x: current.x + fb * (next.x - previous.x),
            y: current.y + fb * (next.y - previous.y)
          }
        };
      };
      helpers$1.EPSILON = Number.EPSILON || 1e-14;
      helpers$1.splineCurveMonotone = function (points) {
        // This function calculates Bézier control points in a similar way than |splineCurve|,
        // but preserves monotonicity of the provided data and ensures no local extremums are added
        // between the dataset discrete points due to the interpolation.
        // See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
  
        var pointsWithTangents = (points || []).map(function (point) {
          return {
            model: point._model,
            deltaK: 0,
            mK: 0
          };
        });
  
        // Calculate slopes (deltaK) and initialize tangents (mK)
        var pointsLen = pointsWithTangents.length;
        var i, pointBefore, pointCurrent, pointAfter;
        for (i = 0; i < pointsLen; ++i) {
          pointCurrent = pointsWithTangents[i];
          if (pointCurrent.model.skip) {
            continue;
          }
  
          pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
          pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
          if (pointAfter && !pointAfter.model.skip) {
            var slopeDeltaX = (pointAfter.model.x - pointCurrent.model.x);
  
            // In the case of two points that appear at the same x pixel, slopeDeltaX is 0
            pointCurrent.deltaK = slopeDeltaX !== 0 ? (pointAfter.model.y - pointCurrent.model.y) / slopeDeltaX : 0;
          }
  
          if (!pointBefore || pointBefore.model.skip) {
            pointCurrent.mK = pointCurrent.deltaK;
          } else if (!pointAfter || pointAfter.model.skip) {
            pointCurrent.mK = pointBefore.deltaK;
          } else if (this.sign(pointBefore.deltaK) !== this.sign(pointCurrent.deltaK)) {
            pointCurrent.mK = 0;
          } else {
            pointCurrent.mK = (pointBefore.deltaK + pointCurrent.deltaK) / 2;
          }
        }
  
        // Adjust tangents to ensure monotonic properties
        var alphaK, betaK, tauK, squaredMagnitude;
        for (i = 0; i < pointsLen - 1; ++i) {
          pointCurrent = pointsWithTangents[i];
          pointAfter = pointsWithTangents[i + 1];
          if (pointCurrent.model.skip || pointAfter.model.skip) {
            continue;
          }
  
          if (helpers$1.almostEquals(pointCurrent.deltaK, 0, this.EPSILON)) {
            pointCurrent.mK = pointAfter.mK = 0;
            continue;
          }
  
          alphaK = pointCurrent.mK / pointCurrent.deltaK;
          betaK = pointAfter.mK / pointCurrent.deltaK;
          squaredMagnitude = Math.pow(alphaK, 2) + Math.pow(betaK, 2);
          if (squaredMagnitude <= 9) {
            continue;
          }
  
          tauK = 3 / Math.sqrt(squaredMagnitude);
          pointCurrent.mK = alphaK * tauK * pointCurrent.deltaK;
          pointAfter.mK = betaK * tauK * pointCurrent.deltaK;
        }
  
        // Compute control points
        var deltaX;
        for (i = 0; i < pointsLen; ++i) {
          pointCurrent = pointsWithTangents[i];
          if (pointCurrent.model.skip) {
            continue;
          }
  
          pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
          pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
          if (pointBefore && !pointBefore.model.skip) {
            deltaX = (pointCurrent.model.x - pointBefore.model.x) / 3;
            pointCurrent.model.controlPointPreviousX = pointCurrent.model.x - deltaX;
            pointCurrent.model.controlPointPreviousY = pointCurrent.model.y - deltaX * pointCurrent.mK;
          }
          if (pointAfter && !pointAfter.model.skip) {
            deltaX = (pointAfter.model.x - pointCurrent.model.x) / 3;
            pointCurrent.model.controlPointNextX = pointCurrent.model.x + deltaX;
            pointCurrent.model.controlPointNextY = pointCurrent.model.y + deltaX * pointCurrent.mK;
          }
        }
      };
      helpers$1.nextItem = function (collection, index, loop) {
        if (loop) {
          return index >= collection.length - 1 ? collection[0] : collection[index + 1];
        }
        return index >= collection.length - 1 ? collection[collection.length - 1] : collection[index + 1];
      };
      helpers$1.previousItem = function (collection, index, loop) {
        if (loop) {
          return index <= 0 ? collection[collection.length - 1] : collection[index - 1];
        }
        return index <= 0 ? collection[0] : collection[index - 1];
      };
      // Implementation of the nice number algorithm used in determining where axis labels will go
      helpers$1.niceNum = function (range, round) {
        var exponent = Math.floor(helpers$1.log10(range));
        var fraction = range / Math.pow(10, exponent);
        var niceFraction;
  
        if (round) {
          if (fraction < 1.5) {
            niceFraction = 1;
          } else if (fraction < 3) {
            niceFraction = 2;
          } else if (fraction < 7) {
            niceFraction = 5;
          } else {
            niceFraction = 10;
          }
        } else if (fraction <= 1.0) {
          niceFraction = 1;
        } else if (fraction <= 2) {
          niceFraction = 2;
        } else if (fraction <= 5) {
          niceFraction = 5;
        } else {
          niceFraction = 10;
        }
  
        return niceFraction * Math.pow(10, exponent);
      };
      // Request animation polyfill - https://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
      helpers$1.requestAnimFrame = (function () {
        if (typeof window === 'undefined') {
          return function (callback) {
            callback();
          };
        }
        return window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function (callback) {
              return window.setTimeout(callback, 1000 / 60);
            };
      }());
      // -- DOM methods
      helpers$1.getRelativePosition = function (evt, chart) {
        var mouseX, mouseY;
        var e = evt.originalEvent || evt;
        var canvas = evt.target || evt.srcElement;
        var boundingRect = canvas.getBoundingClientRect();
  
        var touches = e.touches;
        if (touches && touches.length > 0) {
          mouseX = touches[0].clientX;
          mouseY = touches[0].clientY;
  
        } else {
          mouseX = e.clientX;
          mouseY = e.clientY;
        }
  
        // Scale mouse coordinates into canvas coordinates
        // by following the pattern laid out by 'jerryj' in the comments of
        // https://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
        var paddingLeft = parseFloat(helpers$1.getStyle(canvas, 'padding-left'));
        var paddingTop = parseFloat(helpers$1.getStyle(canvas, 'padding-top'));
        var paddingRight = parseFloat(helpers$1.getStyle(canvas, 'padding-right'));
        var paddingBottom = parseFloat(helpers$1.getStyle(canvas, 'padding-bottom'));
        var width = boundingRect.right - boundingRect.left - paddingLeft - paddingRight;
        var height = boundingRect.bottom - boundingRect.top - paddingTop - paddingBottom;
  
        // We divide by the current device pixel ratio, because the canvas is scaled up by that amount in each direction. However
        // the backend model is in unscaled coordinates. Since we are going to deal with our model coordinates, we go back here
        mouseX = Math.round((mouseX - boundingRect.left - paddingLeft) / (width) * canvas.width / chart.currentDevicePixelRatio);
        mouseY = Math.round((mouseY - boundingRect.top - paddingTop) / (height) * canvas.height / chart.currentDevicePixelRatio);
  
        return {
          x: mouseX,
          y: mouseY
        };
  
      };
  
      // Private helper function to convert max-width/max-height values that may be percentages into a number
      function parseMaxStyle(styleValue, node, parentProperty) {
        var valueInPixels;
        if (typeof styleValue === 'string') {
          valueInPixels = parseInt(styleValue, 10);
  
          if (styleValue.indexOf('%') !== -1) {
            // percentage * size in dimension
            valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
          }
        } else {
          valueInPixels = styleValue;
        }
  
        return valueInPixels;
      }
  
      /**
       * Returns if the given value contains an effective constraint.
       * @private
       */
      function isConstrainedValue(value) {
        return value !== undefined && value !== null && value !== 'none';
      }
  
      /**
       * Returns the max width or height of the given DOM node in a cross-browser compatible fashion
       * @param {HTMLElement} domNode - the node to check the constraint on
       * @param {string} maxStyle - the style that defines the maximum for the direction we are using ('max-width' / 'max-height')
       * @param {string} percentageProperty - property of parent to use when calculating width as a percentage
       * @see {@link https://www.nathanaeljones.com/blog/2013/reading-max-width-cross-browser}
       */
      function getConstraintDimension(domNode, maxStyle, percentageProperty) {
        var view = document.defaultView;
        var parentNode = helpers$1._getParentNode(domNode);
        var constrainedNode = view.getComputedStyle(domNode)[maxStyle];
        var constrainedContainer = view.getComputedStyle(parentNode)[maxStyle];
        var hasCNode = isConstrainedValue(constrainedNode);
        var hasCContainer = isConstrainedValue(constrainedContainer);
        var infinity = Number.POSITIVE_INFINITY;
  
        if (hasCNode || hasCContainer) {
          return Math.min(
              hasCNode ? parseMaxStyle(constrainedNode, domNode, percentageProperty) : infinity,
              hasCContainer ? parseMaxStyle(constrainedContainer, parentNode, percentageProperty) : infinity);
        }
  
        return 'none';
      }
  
      // returns Number or undefined if no constraint
      helpers$1.getConstraintWidth = function (domNode) {
        return getConstraintDimension(domNode, 'max-width', 'clientWidth');
      };
      // returns Number or undefined if no constraint
      helpers$1.getConstraintHeight = function (domNode) {
        return getConstraintDimension(domNode, 'max-height', 'clientHeight');
      };
      /**
       * @private
       */
      helpers$1._calculatePadding = function (container, padding, parentDimension) {
        padding = helpers$1.getStyle(container, padding);
  
        return padding.indexOf('%') > -1 ? parentDimension * parseInt(padding, 10) / 100 : parseInt(padding, 10);
      };
      /**
       * @private
       */
      helpers$1._getParentNode = function (domNode) {
        var parent = domNode.parentNode;
        if (parent && parent.toString() === '[object ShadowRoot]') {
          parent = parent.host;
        }
        return parent;
      };
      helpers$1.getMaximumWidth = function (domNode) {
        var container = helpers$1._getParentNode(domNode);
        if (!container) {
          return domNode.clientWidth;
        }
  
        var clientWidth = container.clientWidth;
        var paddingLeft = helpers$1._calculatePadding(container, 'padding-left', clientWidth);
        var paddingRight = helpers$1._calculatePadding(container, 'padding-right', clientWidth);
  
        var w = clientWidth - paddingLeft - paddingRight;
        var cw = helpers$1.getConstraintWidth(domNode);
        return isNaN(cw) ? w : Math.min(w, cw);
      };
      helpers$1.getMaximumHeight = function (domNode) {
        var container = helpers$1._getParentNode(domNode);
        if (!container) {
          return domNode.clientHeight;
        }
  
        var clientHeight = container.clientHeight;
        var paddingTop = helpers$1._calculatePadding(container, 'padding-top', clientHeight);
        var paddingBottom = helpers$1._calculatePadding(container, 'padding-bottom', clientHeight);
  
        var h = clientHeight - paddingTop - paddingBottom;
        var ch = helpers$1.getConstraintHeight(domNode);
        return isNaN(ch) ? h : Math.min(h, ch);
      };
      helpers$1.getStyle = function (el, property) {
        return el.currentStyle ?
            el.currentStyle[property] :
            document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
      };
      helpers$1.retinaScale = function (chart, forceRatio) {
        var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
        if (pixelRatio === 1) {
          return;
        }
  
        var canvas = chart.canvas;
        var height = chart.height;
        var width = chart.width;
  
        canvas.height = height * pixelRatio;
        canvas.width = width * pixelRatio;
        chart.ctx.scale(pixelRatio, pixelRatio);
  
        // If no style has been set on the canvas, the render size is used as display size,
        // making the chart visually bigger, so let's enforce it to the "correct" values.
        // See https://github.com/chartjs/Chart.js/issues/3575
        if (!canvas.style.height && !canvas.style.width) {
          canvas.style.height = height + 'px';
          canvas.style.width = width + 'px';
        }
      };
      // -- Canvas methods
      helpers$1.fontString = function (pixelSize, fontStyle, fontFamily) {
        return fontStyle + ' ' + pixelSize + 'px ' + fontFamily;
      };
      helpers$1.longestText = function (ctx, font, arrayOfThings, cache) {
        cache = cache || {};
        var data = cache.data = cache.data || {};
        var gc = cache.garbageCollect = cache.garbageCollect || [];
  
        if (cache.font !== font) {
          data = cache.data = {};
          gc = cache.garbageCollect = [];
          cache.font = font;
        }
  
        ctx.font = font;
        var longest = 0;
        helpers$1.each(arrayOfThings, function (thing) {
          // Undefined strings and arrays should not be measured
          if (thing !== undefined && thing !== null && helpers$1.isArray(thing) !== true) {
            longest = helpers$1.measureText(ctx, data, gc, longest, thing);
          } else if (helpers$1.isArray(thing)) {
            // if it is an array lets measure each element
            // to do maybe simplify this function a bit so we can do this more recursively?
            helpers$1.each(thing, function (nestedThing) {
              // Undefined strings and arrays should not be measured
              if (nestedThing !== undefined && nestedThing !== null && !helpers$1.isArray(nestedThing)) {
                longest = helpers$1.measureText(ctx, data, gc, longest, nestedThing);
              }
            });
          }
        });
  
        var gcLen = gc.length / 2;
        if (gcLen > arrayOfThings.length) {
          for (var i = 0; i < gcLen; i++) {
            delete data[gc[i]];
          }
          gc.splice(0, gcLen);
        }
        return longest;
      };
      helpers$1.measureText = function (ctx, data, gc, longest, string) {
        var textWidth = data[string];
        if (!textWidth) {
          textWidth = data[string] = ctx.measureText(string).width;
          gc.push(string);
        }
        if (textWidth > longest) {
          longest = textWidth;
        }
        return longest;
      };
      helpers$1.numberOfLabelLines = function (arrayOfThings) {
        var numberOfLines = 1;
        helpers$1.each(arrayOfThings, function (thing) {
          if (helpers$1.isArray(thing)) {
            if (thing.length > numberOfLines) {
              numberOfLines = thing.length;
            }
          }
        });
        return numberOfLines;
      };
  
      helpers$1.color = !chartjsColor ?
          function (value) {
            console.error('Color.js not found!');
            return value;
          } :
          function (value) {
            /* global CanvasGradient */
            if (value instanceof CanvasGradient) {
              value = core_defaults.global.defaultColor;
            }
  
            return chartjsColor(value);
          };
  
      helpers$1.getHoverColor = function (colorValue) {
        /* global CanvasPattern */
        return (colorValue instanceof CanvasPattern || colorValue instanceof CanvasGradient) ?
            colorValue :
            helpers$1.color(colorValue).saturate(0.5).darken(0.1).rgbString();
      };
    };
  
    function abstract() {
      throw new Error(
          'This method is not implemented: either no adapter can ' +
          'be found or an incomplete integration was provided.'
      );
    }
  
    /**
     * Date adapter (current used by the time scale)
     * @namespace Chart._adapters._date
     * @memberof Chart._adapters
     * @private
     */
  
    /**
     * Currently supported unit string values.
     * @typedef {('millisecond'|'second'|'minute'|'hour'|'day'|'week'|'month'|'quarter'|'year')}
     * @memberof Chart._adapters._date
     * @name Unit
     */
  
    /**
     * @class
     */
    function DateAdapter(options) {
      this.options = options || {};
    }
  
    helpers$1.extend(DateAdapter.prototype, /** @lends DateAdapter */ {
      /**
       * Returns a map of time formats for the supported formatting units defined
       * in Unit as well as 'datetime' representing a detailed date/time string.
       * @returns {{string: string}}
       */
      formats: abstract,
  
      /**
       * Parses the given `value` and return the associated timestamp.
       * @param {any} value - the value to parse (usually comes from the data)
       * @param {string} [format] - the expected data format
       * @returns {(number|null)}
       * @function
       */
      parse: abstract,
  
      /**
       * Returns the formatted date in the specified `format` for a given `timestamp`.
       * @param {number} timestamp - the timestamp to format
       * @param {string} format - the date/time token
       * @return {string}
       * @function
       */
      format: abstract,
  
      /**
       * Adds the specified `amount` of `unit` to the given `timestamp`.
       * @param {number} timestamp - the input timestamp
       * @param {number} amount - the amount to add
       * @param {Unit} unit - the unit as string
       * @return {number}
       * @function
       */
      add: abstract,
  
      /**
       * Returns the number of `unit` between the given timestamps.
       * @param {number} max - the input timestamp (reference)
       * @param {number} min - the timestamp to substract
       * @param {Unit} unit - the unit as string
       * @return {number}
       * @function
       */
      diff: abstract,
  
      /**
       * Returns start of `unit` for the given `timestamp`.
       * @param {number} timestamp - the input timestamp
       * @param {Unit} unit - the unit as string
       * @param {number} [weekday] - the ISO day of the week with 1 being Monday
       * and 7 being Sunday (only needed if param *unit* is `isoWeek`).
       * @function
       */
      startOf: abstract,
  
      /**
       * Returns end of `unit` for the given `timestamp`.
       * @param {number} timestamp - the input timestamp
       * @param {Unit} unit - the unit as string
       * @function
       */
      endOf: abstract,
  
      // DEPRECATIONS
  
      /**
       * Provided for backward compatibility for scale.getValueForPixel(),
       * this method should be overridden only by the moment adapter.
       * @deprecated since version 2.8.0
       * @todo remove at version 3
       * @private
       */
      _create: function (value) {
        return value;
      }
    });
  
    DateAdapter.override = function (members) {
      helpers$1.extend(DateAdapter.prototype, members);
    };
  
    var _date = DateAdapter;
  
    var core_adapters = {
      _date: _date
    };
  
    /**
     * Namespace to hold static tick generation functions
     * @namespace Chart.Ticks
     */
    var core_ticks = {
      /**
       * Namespace to hold formatters for different types of ticks
       * @namespace Chart.Ticks.formatters
       */
      formatters: {
        /**
         * Formatter for value labels
         * @method Chart.Ticks.formatters.values
         * @param value the value to display
         * @return {string|string[]} the label to display
         */
        values: function (value) {
          return helpers$1.isArray(value) ? value : '' + value;
        },
  
        /**
         * Formatter for linear numeric ticks
         * @method Chart.Ticks.formatters.linear
         * @param tickValue {number} the value to be formatted
         * @param index {number} the position of the tickValue parameter in the ticks array
         * @param ticks {number[]} the list of ticks being converted
         * @return {string} string representation of the tickValue parameter
         */
        linear: function (tickValue, index, ticks) {
          // If we have lots of ticks, don't use the ones
          var delta = ticks.length > 3 ? ticks[2] - ticks[1] : ticks[1] - ticks[0];
  
          // If we have a number like 2.5 as the delta, figure out how many decimal places we need
          if (Math.abs(delta) > 1) {
            if (tickValue !== Math.floor(tickValue)) {
              // not an integer
              delta = tickValue - Math.floor(tickValue);
            }
          }
  
          var logDelta = helpers$1.log10(Math.abs(delta));
          var tickString = '';
  
          if (tickValue !== 0) {
            var maxTick = Math.max(Math.abs(ticks[0]), Math.abs(ticks[ticks.length - 1]));
            if (maxTick < 1e-4) { // all ticks are small numbers; use scientific notation
              var logTick = helpers$1.log10(Math.abs(tickValue));
              tickString = tickValue.toExponential(Math.floor(logTick) - Math.floor(logDelta));
            } else {
              var numDecimal = -1 * Math.floor(logDelta);
              numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
              tickString = tickValue.toFixed(numDecimal);
            }
          } else {
            tickString = '0'; // never show decimal places for 0
          }
  
          return tickString;
        },
  
        logarithmic: function (tickValue, index, ticks) {
          var remain = tickValue / (Math.pow(10, Math.floor(helpers$1.log10(tickValue))));
  
          if (tickValue === 0) {
            return '0';
          } else if (remain === 1 || remain === 2 || remain === 5 || index === 0 || index === ticks.length - 1) {
            return tickValue.toExponential();
          }
          return '';
        }
      }
    };
  
    var valueOrDefault$9 = helpers$1.valueOrDefault;
    var valueAtIndexOrDefault = helpers$1.valueAtIndexOrDefault;
  
    core_defaults._set('scale', {
      display: true,
      position: 'left',
      offset: false,
  
      // grid line settings
      gridLines: {
        display: true,
        color: 'rgba(0, 0, 0, 0.1)',
        lineWidth: 1,
        drawBorder: true,
        drawOnChartArea: true,
        drawTicks: true,
        tickMarkLength: 10,
        zeroLineWidth: 1,
        zeroLineColor: 'rgba(0,0,0,0.25)',
        zeroLineBorderDash: [],
        zeroLineBorderDashOffset: 0.0,
        offsetGridLines: false,
        borderDash: [],
        borderDashOffset: 0.0
      },
  
      // scale label
      scaleLabel: {
        // display property
        display: false,
  
        // actual label
        labelString: '',
  
        // top/bottom padding
        padding: {
          top: 4,
          bottom: 4
        }
      },
  
      // label settings
      ticks: {
        beginAtZero: false,
        minRotation: 0,
        maxRotation: 50,
        mirror: false,
        padding: 0,
        reverse: false,
        display: true,
        autoSkip: true,
        autoSkipPadding: 0,
        labelOffset: 0,
        // We pass through arrays to be rendered as multiline labels, we convert Others to strings here.
        callback: core_ticks.formatters.values,
        minor: {},
        major: {}
      }
    });
  
    function labelsFromTicks(ticks) {
      var labels = [];
      var i, ilen;
  
      for (i = 0, ilen = ticks.length; i < ilen; ++i) {
        labels.push(ticks[i].label);
      }
  
      return labels;
    }
  
    function getPixelForGridLine(scale, index, offsetGridLines) {
      var lineValue = scale.getPixelForTick(index);
  
      if (offsetGridLines) {
        if (scale.getTicks().length === 1) {
          lineValue -= scale.isHorizontal() ?
              Math.max(lineValue - scale.left, scale.right - lineValue) :
              Math.max(lineValue - scale.top, scale.bottom - lineValue);
        } else if (index === 0) {
          lineValue -= (scale.getPixelForTick(1) - lineValue) / 2;
        } else {
          lineValue -= (lineValue - scale.getPixelForTick(index - 1)) / 2;
        }
      }
      return lineValue;
    }
  
    function computeTextSize(context, tick, font) {
      return helpers$1.isArray(tick) ?
          helpers$1.longestText(context, font, tick) :
          context.measureText(tick).width;
    }
  
    var core_scale = core_element.extend({
      /**
       * Get the padding needed for the scale
       * @method getPadding
       * @private
       * @returns {Padding} the necessary padding
       */
      getPadding: function () {
        var me = this;
        return {
          left: me.paddingLeft || 0,
          top: me.paddingTop || 0,
          right: me.paddingRight || 0,
          bottom: me.paddingBottom || 0
        };
      },
  
      /**
       * Returns the scale tick objects ({label, major})
       * @since 2.7
       */
      getTicks: function () {
        return this._ticks;
      },
  
      // These methods are ordered by lifecyle. Utilities then follow.
      // Any function defined here is inherited by all scale types.
      // Any function can be extended by the scale type
  
      mergeTicksOptions: function () {
        var ticks = this.options.ticks;
        if (ticks.minor === false) {
          ticks.minor = {
            display: false
          };
        }
        if (ticks.major === false) {
          ticks.major = {
            display: false
          };
        }
        for (var key in ticks) {
          if (key !== 'major' && key !== 'minor') {
            if (typeof ticks.minor[key] === 'undefined') {
              ticks.minor[key] = ticks[key];
            }
            if (typeof ticks.major[key] === 'undefined') {
              ticks.major[key] = ticks[key];
            }
          }
        }
      },
      beforeUpdate: function () {
        helpers$1.callback(this.options.beforeUpdate, [this]);
      },
  
      update: function (maxWidth, maxHeight, margins) {
        var me = this;
        var i, ilen, labels, label, ticks, tick;
  
        // Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
        me.beforeUpdate();
  
        // Absorb the master measurements
        me.maxWidth = maxWidth;
        me.maxHeight = maxHeight;
        me.margins = helpers$1.extend({
          left: 0,
          right: 0,
          top: 0,
          bottom: 0
        }, margins);
  
        me._maxLabelLines = 0;
        me.longestLabelWidth = 0;
        me.longestTextCache = me.longestTextCache || {};
  
        // Dimensions
        me.beforeSetDimensions();
        me.setDimensions();
        me.afterSetDimensions();
  
        // Data min/max
        me.beforeDataLimits();
        me.determineDataLimits();
        me.afterDataLimits();
  
        // Ticks - `this.ticks` is now DEPRECATED!
        // Internal ticks are now stored as objects in the PRIVATE `this._ticks` member
        // and must not be accessed directly from outside this class. `this.ticks` being
        // around for long time and not marked as private, we can't change its structure
        // without unexpected breaking changes. If you need to access the scale ticks,
        // use scale.getTicks() instead.
  
        me.beforeBuildTicks();
  
        // New implementations should return an array of objects but for BACKWARD COMPAT,
        // we still support no return (`this.ticks` internally set by calling this method).
        ticks = me.buildTicks() || [];
  
        // Allow modification of ticks in callback.
        ticks = me.afterBuildTicks(ticks) || ticks;
  
        me.beforeTickToLabelConversion();
  
        // New implementations should return the formatted tick labels but for BACKWARD
        // COMPAT, we still support no return (`this.ticks` internally changed by calling
        // this method and supposed to contain only string values).
        labels = me.convertTicksToLabels(ticks) || me.ticks;
  
        me.afterTickToLabelConversion();
  
        me.ticks = labels;   // BACKWARD COMPATIBILITY
  
        // IMPORTANT: from this point, we consider that `this.ticks` will NEVER change!
  
        // BACKWARD COMPAT: synchronize `_ticks` with labels (so potentially `this.ticks`)
        for (i = 0, ilen = labels.length; i < ilen; ++i) {
          label = labels[i];
          tick = ticks[i];
          if (!tick) {
            ticks.push(tick = {
              label: label,
              major: false
            });
          } else {
            tick.label = label;
          }
        }
  
        me._ticks = ticks;
  
        // Tick Rotation
        me.beforeCalculateTickRotation();
        me.calculateTickRotation();
        me.afterCalculateTickRotation();
        // Fit
        me.beforeFit();
        me.fit();
        me.afterFit();
        //
        me.afterUpdate();
  
        return me.minSize;
  
      },
      afterUpdate: function () {
        helpers$1.callback(this.options.afterUpdate, [this]);
      },
  
      //
  
      beforeSetDimensions: function () {
        helpers$1.callback(this.options.beforeSetDimensions, [this]);
      },
      setDimensions: function () {
        var me = this;
        // Set the unconstrained dimension before label rotation
        if (me.isHorizontal()) {
          // Reset position before calculating rotation
          me.width = me.maxWidth;
          me.left = 0;
          me.right = me.width;
        } else {
          me.height = me.maxHeight;
  
          // Reset position before calculating rotation
          me.top = 0;
          me.bottom = me.height;
        }
  
        // Reset padding
        me.paddingLeft = 0;
        me.paddingTop = 0;
        me.paddingRight = 0;
        me.paddingBottom = 0;
      },
      afterSetDimensions: function () {
        helpers$1.callback(this.options.afterSetDimensions, [this]);
      },
  
      // Data limits
      beforeDataLimits: function () {
        helpers$1.callback(this.options.beforeDataLimits, [this]);
      },
      determineDataLimits: helpers$1.noop,
      afterDataLimits: function () {
        helpers$1.callback(this.options.afterDataLimits, [this]);
      },
  
      //
      beforeBuildTicks: function () {
        helpers$1.callback(this.options.beforeBuildTicks, [this]);
      },
      buildTicks: helpers$1.noop,
      afterBuildTicks: function (ticks) {
        var me = this;
        // ticks is empty for old axis implementations here
        if (helpers$1.isArray(ticks) && ticks.length) {
          return helpers$1.callback(me.options.afterBuildTicks, [me, ticks]);
        }
        // Support old implementations (that modified `this.ticks` directly in buildTicks)
        me.ticks = helpers$1.callback(me.options.afterBuildTicks, [me, me.ticks]) || me.ticks;
        return ticks;
      },
  
      beforeTickToLabelConversion: function () {
        helpers$1.callback(this.options.beforeTickToLabelConversion, [this]);
      },
      convertTicksToLabels: function () {
        var me = this;
        // Convert ticks to strings
        var tickOpts = me.options.ticks;
        me.ticks = me.ticks.map(tickOpts.userCallback || tickOpts.callback, this);
      },
      afterTickToLabelConversion: function () {
        helpers$1.callback(this.options.afterTickToLabelConversion, [this]);
      },
  
      //
  
      beforeCalculateTickRotation: function () {
        helpers$1.callback(this.options.beforeCalculateTickRotation, [this]);
      },
      calculateTickRotation: function () {
        var me = this;
        var context = me.ctx;
        var tickOpts = me.options.ticks;
        var labels = labelsFromTicks(me._ticks);
  
        // Get the width of each grid by calculating the difference
        // between x offsets between 0 and 1.
        var tickFont = helpers$1.options._parseFont(tickOpts);
        context.font = tickFont.string;
  
        var labelRotation = tickOpts.minRotation || 0;
  
        if (labels.length && me.options.display && me.isHorizontal()) {
          var originalLabelWidth = helpers$1.longestText(context, tickFont.string, labels, me.longestTextCache);
          var labelWidth = originalLabelWidth;
          var cosRotation, sinRotation;
  
          // Allow 3 pixels x2 padding either side for label readability
          var tickWidth = me.getPixelForTick(1) - me.getPixelForTick(0) - 6;
  
          // Max label rotation can be set or default to 90 - also act as a loop counter
          while (labelWidth > tickWidth && labelRotation < tickOpts.maxRotation) {
            var angleRadians = helpers$1.toRadians(labelRotation);
            cosRotation = Math.cos(angleRadians);
            sinRotation = Math.sin(angleRadians);
  
            if (sinRotation * originalLabelWidth > me.maxHeight) {
              // go back one step
              labelRotation--;
              break;
            }
  
            labelRotation++;
            labelWidth = cosRotation * originalLabelWidth;
          }
        }
  
        me.labelRotation = labelRotation;
      },
      afterCalculateTickRotation: function () {
        helpers$1.callback(this.options.afterCalculateTickRotation, [this]);
      },
  
      //
  
      beforeFit: function () {
        helpers$1.callback(this.options.beforeFit, [this]);
      },
      fit: function () {
        var me = this;
        // Reset
        var minSize = me.minSize = {
          width: 0,
          height: 0
        };
  
        var labels = labelsFromTicks(me._ticks);
  
        var opts = me.options;
        var tickOpts = opts.ticks;
        var scaleLabelOpts = opts.scaleLabel;
        var gridLineOpts = opts.gridLines;
        var display = me._isVisible();
        var position = opts.position;
        var isHorizontal = me.isHorizontal();
  
        var parseFont = helpers$1.options._parseFont;
        var tickFont = parseFont(tickOpts);
        var tickMarkLength = opts.gridLines.tickMarkLength;
  
        // Width
        if (isHorizontal) {
          // subtract the margins to line up with the chartArea if we are a full width scale
          minSize.width = me.isFullWidth() ? me.maxWidth - me.margins.left - me.margins.right : me.maxWidth;
        } else {
          minSize.width = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
        }
  
        // height
        if (isHorizontal) {
          minSize.height = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
        } else {
          minSize.height = me.maxHeight; // fill all the height
        }
  
        // Are we showing a title for the scale?
        if (scaleLabelOpts.display && display) {
          var scaleLabelFont = parseFont(scaleLabelOpts);
          var scaleLabelPadding = helpers$1.options.toPadding(scaleLabelOpts.padding);
          var deltaHeight = scaleLabelFont.lineHeight + scaleLabelPadding.height;
  
          if (isHorizontal) {
            minSize.height += deltaHeight;
          } else {
            minSize.width += deltaHeight;
          }
        }
  
        // Don't bother fitting the ticks if we are not showing the labels
        if (tickOpts.display && display) {
          var largestTextWidth = helpers$1.longestText(me.ctx, tickFont.string, labels, me.longestTextCache);
          var tallestLabelHeightInLines = helpers$1.numberOfLabelLines(labels);
          var lineSpace = tickFont.size * 0.5;
          var tickPadding = me.options.ticks.padding;
  
          // Store max number of lines and widest label for _autoSkip
          me._maxLabelLines = tallestLabelHeightInLines;
          me.longestLabelWidth = largestTextWidth;
  
          if (isHorizontal) {
            var angleRadians = helpers$1.toRadians(me.labelRotation);
            var cosRotation = Math.cos(angleRadians);
            var sinRotation = Math.sin(angleRadians);
  
            // TODO - improve this calculation
            var labelHeight = (sinRotation * largestTextWidth)
                + (tickFont.lineHeight * tallestLabelHeightInLines)
                + lineSpace; // padding
  
            minSize.height = Math.min(me.maxHeight, minSize.height + labelHeight + tickPadding);
  
            me.ctx.font = tickFont.string;
            var firstLabelWidth = computeTextSize(me.ctx, labels[0], tickFont.string);
            var lastLabelWidth = computeTextSize(me.ctx, labels[labels.length - 1], tickFont.string);
            var offsetLeft = me.getPixelForTick(0) - me.left;
            var offsetRight = me.right - me.getPixelForTick(labels.length - 1);
            var paddingLeft, paddingRight;
  
            // Ensure that our ticks are always inside the canvas. When rotated, ticks are right aligned
            // which means that the right padding is dominated by the font height
            if (me.labelRotation !== 0) {
              paddingLeft = position === 'bottom' ? (cosRotation * firstLabelWidth) : (cosRotation * lineSpace);
              paddingRight = position === 'bottom' ? (cosRotation * lineSpace) : (cosRotation * lastLabelWidth);
            } else {
              paddingLeft = firstLabelWidth / 2;
              paddingRight = lastLabelWidth / 2;
            }
            me.paddingLeft = Math.max(paddingLeft - offsetLeft, 0) + 3; // add 3 px to move away from canvas edges
            me.paddingRight = Math.max(paddingRight - offsetRight, 0) + 3;
          } else {
            // A vertical axis is more constrained by the width. Labels are the
            // dominant factor here, so get that length first and account for padding
            if (tickOpts.mirror) {
              largestTextWidth = 0;
            } else {
              // use lineSpace for consistency with horizontal axis
              // tickPadding is not implemented for horizontal
              largestTextWidth += tickPadding + lineSpace;
            }
  
            minSize.width = Math.min(me.maxWidth, minSize.width + largestTextWidth);
  
            me.paddingTop = tickFont.size / 2;
            me.paddingBottom = tickFont.size / 2;
          }
        }
  
        me.handleMargins();
  
        me.width = minSize.width;
        me.height = minSize.height;
      },
  
      /**
       * Handle margins and padding interactions
       * @private
       */
      handleMargins: function () {
        var me = this;
        if (me.margins) {
          me.paddingLeft = Math.max(me.paddingLeft - me.margins.left, 0);
          me.paddingTop = Math.max(me.paddingTop - me.margins.top, 0);
          me.paddingRight = Math.max(me.paddingRight - me.margins.right, 0);
          me.paddingBottom = Math.max(me.paddingBottom - me.margins.bottom, 0);
        }
      },
  
      afterFit: function () {
        helpers$1.callback(this.options.afterFit, [this]);
      },
  
      // Shared Methods
      isHorizontal: function () {
        return this.options.position === 'top' || this.options.position === 'bottom';
      },
      isFullWidth: function () {
        return (this.options.fullWidth);
      },
  
      // Get the correct value. NaN bad inputs, If the value type is object get the x or y based on whether we are horizontal or not
      getRightValue: function (rawValue) {
        // Null and undefined values first
        if (helpers$1.isNullOrUndef(rawValue)) {
          return NaN;
        }
        // isNaN(object) returns true, so make sure NaN is checking for a number; Discard Infinite values
        if ((typeof rawValue === 'number' || rawValue instanceof Number) && !isFinite(rawValue)) {
          return NaN;
        }
        // If it is in fact an object, dive in one more level
        if (rawValue) {
          if (this.isHorizontal()) {
            if (rawValue.x !== undefined) {
              return this.getRightValue(rawValue.x);
            }
          } else if (rawValue.y !== undefined) {
            return this.getRightValue(rawValue.y);
          }
        }
  
        // Value is good, return it
        return rawValue;
      },
  
      /**
       * Used to get the value to display in the tooltip for the data at the given index
       * @param index
       * @param datasetIndex
       */
      getLabelForIndex: helpers$1.noop,
  
      /**
       * Returns the location of the given data point. Value can either be an index or a numerical value
       * The coordinate (0, 0) is at the upper-left corner of the canvas
       * @param value
       * @param index
       * @param datasetIndex
       */
      getPixelForValue: helpers$1.noop,
  
      /**
       * Used to get the data value from a given pixel. This is the inverse of getPixelForValue
       * The coordinate (0, 0) is at the upper-left corner of the canvas
       * @param pixel
       */
      getValueForPixel: helpers$1.noop,
  
      /**
       * Returns the location of the tick at the given index
       * The coordinate (0, 0) is at the upper-left corner of the canvas
       */
      getPixelForTick: function (index) {
        var me = this;
        var offset = me.options.offset;
        if (me.isHorizontal()) {
          var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
          var tickWidth = innerWidth / Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
          var pixel = (tickWidth * index) + me.paddingLeft;
  
          if (offset) {
            pixel += tickWidth / 2;
          }
  
          var finalVal = me.left + pixel;
          finalVal += me.isFullWidth() ? me.margins.left : 0;
          return finalVal;
        }
        var innerHeight = me.height - (me.paddingTop + me.paddingBottom);
        return me.top + (index * (innerHeight / (me._ticks.length - 1)));
      },
  
      /**
       * Utility for getting the pixel location of a percentage of scale
       * The coordinate (0, 0) is at the upper-left corner of the canvas
       */
      getPixelForDecimal: function (decimal) {
        var me = this;
        if (me.isHorizontal()) {
          var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
          var valueOffset = (innerWidth * decimal) + me.paddingLeft;
  
          var finalVal = me.left + valueOffset;
          finalVal += me.isFullWidth() ? me.margins.left : 0;
          return finalVal;
        }
        return me.top + (decimal * me.height);
      },
  
      /**
       * Returns the pixel for the minimum chart value
       * The coordinate (0, 0) is at the upper-left corner of the canvas
       */
      getBasePixel: function () {
        return this.getPixelForValue(this.getBaseValue());
      },
  
      getBaseValue: function () {
        var me = this;
        var min = me.min;
        var max = me.max;
  
        return me.beginAtZero ? 0 :
            min < 0 && max < 0 ? max :
                min > 0 && max > 0 ? min :
                    0;
      },
  
      /**
       * Returns a subset of ticks to be plotted to avoid overlapping labels.
       * @private
       */
      _autoSkip: function (ticks) {
        var me = this;
        var isHorizontal = me.isHorizontal();
        var optionTicks = me.options.ticks.minor;
        var tickCount = ticks.length;
        var skipRatio = false;
        var maxTicks = optionTicks.maxTicksLimit;
  
        // Total space needed to display all ticks. First and last ticks are
        // drawn as their center at end of axis, so tickCount-1
        var ticksLength = me._tickSize() * (tickCount - 1);
  
        // Axis length
        var axisLength = isHorizontal
            ? me.width - (me.paddingLeft + me.paddingRight)
            : me.height - (me.paddingTop + me.PaddingBottom);
  
        var result = [];
        var i, tick;
  
        if (ticksLength > axisLength) {
          skipRatio = 1 + Math.floor(ticksLength / axisLength);
        }
  
        // if they defined a max number of optionTicks,
        // increase skipRatio until that number is met
        if (tickCount > maxTicks) {
          skipRatio = Math.max(skipRatio, 1 + Math.floor(tickCount / maxTicks));
        }
  
        for (i = 0; i < tickCount; i++) {
          tick = ticks[i];
  
          if (skipRatio > 1 && i % skipRatio > 0) {
            // leave tick in place but make sure it's not displayed (#4635)
            delete tick.label;
          }
          result.push(tick);
        }
        return result;
      },
  
      /**
       * @private
       */
      _tickSize: function () {
        var me = this;
        var isHorizontal = me.isHorizontal();
        var optionTicks = me.options.ticks.minor;
  
        // Calculate space needed by label in axis direction.
        var rot = helpers$1.toRadians(me.labelRotation);
        var cos = Math.abs(Math.cos(rot));
        var sin = Math.abs(Math.sin(rot));
  
        var padding = optionTicks.autoSkipPadding || 0;
        var w = (me.longestLabelWidth + padding) || 0;
  
        var tickFont = helpers$1.options._parseFont(optionTicks);
        var h = (me._maxLabelLines * tickFont.lineHeight + padding) || 0;
  
        // Calculate space needed for 1 tick in axis direction.
        return isHorizontal
            ? h * cos > w * sin ? w / cos : h / sin
            : h * sin < w * cos ? h / cos : w / sin;
      },
  
      /**
       * @private
       */
      _isVisible: function () {
        var me = this;
        var chart = me.chart;
        var display = me.options.display;
        var i, ilen, meta;
  
        if (display !== 'auto') {
          return !!display;
        }
  
        // When 'auto', the scale is visible if at least one associated dataset is visible.
        for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
          if (chart.isDatasetVisible(i)) {
            meta = chart.getDatasetMeta(i);
            if (meta.xAxisID === me.id || meta.yAxisID === me.id) {
              return true;
            }
          }
        }
  
        return false;
      },
  
      /**
       * Actually draw the scale on the canvas
       * @param {object} chartArea - the area of the chart to draw full grid lines on
       */
      draw: function (chartArea) {
        var me = this;
        var options = me.options;
  
        if (!me._isVisible()) {
          return;
        }
  
        var chart = me.chart;
        var context = me.ctx;
        var globalDefaults = core_defaults.global;
        var defaultFontColor = globalDefaults.defaultFontColor;
        var optionTicks = options.ticks.minor;
        var optionMajorTicks = options.ticks.major || optionTicks;
        var gridLines = options.gridLines;
        var scaleLabel = options.scaleLabel;
        var position = options.position;
  
        var isRotated = me.labelRotation !== 0;
        var isMirrored = optionTicks.mirror;
        var isHorizontal = me.isHorizontal();
  
        var parseFont = helpers$1.options._parseFont;
        var ticks = optionTicks.display && optionTicks.autoSkip ? me._autoSkip(me.getTicks()) : me.getTicks();
        var tickFontColor = valueOrDefault$9(optionTicks.fontColor, defaultFontColor);
        var tickFont = parseFont(optionTicks);
        var lineHeight = tickFont.lineHeight;
        var majorTickFontColor = valueOrDefault$9(optionMajorTicks.fontColor, defaultFontColor);
        var majorTickFont = parseFont(optionMajorTicks);
        var tickPadding = optionTicks.padding;
        var labelOffset = optionTicks.labelOffset;
  
        var tl = gridLines.drawTicks ? gridLines.tickMarkLength : 0;
  
        var scaleLabelFontColor = valueOrDefault$9(scaleLabel.fontColor, defaultFontColor);
        var scaleLabelFont = parseFont(scaleLabel);
        var scaleLabelPadding = helpers$1.options.toPadding(scaleLabel.padding);
        var labelRotationRadians = helpers$1.toRadians(me.labelRotation);
  
        var itemsToDraw = [];
  
        var axisWidth = gridLines.drawBorder ? valueAtIndexOrDefault(gridLines.lineWidth, 0, 0) : 0;
        var alignPixel = helpers$1._alignPixel;
        var borderValue, tickStart, tickEnd;
  
        if (position === 'top') {
          borderValue = alignPixel(chart, me.bottom, axisWidth);
          tickStart = me.bottom - tl;
          tickEnd = borderValue - axisWidth / 2;
        } else if (position === 'bottom') {
          borderValue = alignPixel(chart, me.top, axisWidth);
          tickStart = borderValue + axisWidth / 2;
          tickEnd = me.top + tl;
        } else if (position === 'left') {
          borderValue = alignPixel(chart, me.right, axisWidth);
          tickStart = me.right - tl;
          tickEnd = borderValue - axisWidth / 2;
        } else {
          borderValue = alignPixel(chart, me.left, axisWidth);
          tickStart = borderValue + axisWidth / 2;
          tickEnd = me.left + tl;
        }
  
        var epsilon = 0.0000001; // 0.0000001 is margin in pixels for Accumulated error.
  
        helpers$1.each(ticks, function (tick, index) {
          // autoskipper skipped this tick (#4635)
          if (helpers$1.isNullOrUndef(tick.label)) {
            return;
          }
  
          var label = tick.label;
          var lineWidth, lineColor, borderDash, borderDashOffset;
          if (index === me.zeroLineIndex && options.offset === gridLines.offsetGridLines) {
            // Draw the first index specially
            lineWidth = gridLines.zeroLineWidth;
            lineColor = gridLines.zeroLineColor;
            borderDash = gridLines.zeroLineBorderDash || [];
            borderDashOffset = gridLines.zeroLineBorderDashOffset || 0.0;
          } else {
            lineWidth = valueAtIndexOrDefault(gridLines.lineWidth, index);
            lineColor = valueAtIndexOrDefault(gridLines.color, index);
            borderDash = gridLines.borderDash || [];
            borderDashOffset = gridLines.borderDashOffset || 0.0;
          }
  
          // Common properties
          var tx1, ty1, tx2, ty2, x1, y1, x2, y2, labelX, labelY, textOffset, textAlign;
          var labelCount = helpers$1.isArray(label) ? label.length : 1;
          var lineValue = getPixelForGridLine(me, index, gridLines.offsetGridLines);
  
          if (isHorizontal) {
            var labelYOffset = tl + tickPadding;
  
            if (lineValue < me.left - epsilon) {
              lineColor = 'rgba(0,0,0,0)';
            }
  
            tx1 = tx2 = x1 = x2 = alignPixel(chart, lineValue, lineWidth);
            ty1 = tickStart;
            ty2 = tickEnd;
            labelX = me.getPixelForTick(index) + labelOffset; // x values for optionTicks (need to consider offsetLabel option)
  
            if (position === 'top') {
              y1 = alignPixel(chart, chartArea.top, axisWidth) + axisWidth / 2;
              y2 = chartArea.bottom;
              textOffset = ((!isRotated ? 0.5 : 1) - labelCount) * lineHeight;
              textAlign = !isRotated ? 'center' : 'left';
              labelY = me.bottom - labelYOffset;
            } else {
              y1 = chartArea.top;
              y2 = alignPixel(chart, chartArea.bottom, axisWidth) - axisWidth / 2;
              textOffset = (!isRotated ? 0.5 : 0) * lineHeight;
              textAlign = !isRotated ? 'center' : 'right';
              labelY = me.top + labelYOffset;
            }
          } else {
            var labelXOffset = (isMirrored ? 0 : tl) + tickPadding;
  
            if (lineValue < me.top - epsilon) {
              lineColor = 'rgba(0,0,0,0)';
            }
  
            tx1 = tickStart;
            tx2 = tickEnd;
            ty1 = ty2 = y1 = y2 = alignPixel(chart, lineValue, lineWidth);
            labelY = me.getPixelForTick(index) + labelOffset;
            textOffset = (1 - labelCount) * lineHeight / 2;
  
            if (position === 'left') {
              x1 = alignPixel(chart, chartArea.left, axisWidth) + axisWidth / 2;
              x2 = chartArea.right;
              textAlign = isMirrored ? 'left' : 'right';
              labelX = me.right - labelXOffset;
            } else {
              x1 = chartArea.left;
              x2 = alignPixel(chart, chartArea.right, axisWidth) - axisWidth / 2;
              textAlign = isMirrored ? 'right' : 'left';
              labelX = me.left + labelXOffset;
            }
          }
  
          itemsToDraw.push({
            tx1: tx1,
            ty1: ty1,
            tx2: tx2,
            ty2: ty2,
            x1: x1,
            y1: y1,
            x2: x2,
            y2: y2,
            labelX: labelX,
            labelY: labelY,
            glWidth: lineWidth,
            glColor: lineColor,
            glBorderDash: borderDash,
            glBorderDashOffset: borderDashOffset,
            rotation: -1 * labelRotationRadians,
            label: label,
            major: tick.major,
            textOffset: textOffset,
            textAlign: textAlign
          });
        });
  
        // Draw all of the tick labels, tick marks, and grid lines at the correct places
        helpers$1.each(itemsToDraw, function (itemToDraw) {
          var glWidth = itemToDraw.glWidth;
          var glColor = itemToDraw.glColor;
  
          if (gridLines.display && glWidth && glColor) {
            context.save();
            context.lineWidth = glWidth;
            context.strokeStyle = glColor;
            if (context.setLineDash) {
              context.setLineDash(itemToDraw.glBorderDash);
              context.lineDashOffset = itemToDraw.glBorderDashOffset;
            }
  
            context.beginPath();
  
            if (gridLines.drawTicks) {
              context.moveTo(itemToDraw.tx1, itemToDraw.ty1);
              context.lineTo(itemToDraw.tx2, itemToDraw.ty2);
            }
  
            if (gridLines.drawOnChartArea) {
              context.moveTo(itemToDraw.x1, itemToDraw.y1);
              context.lineTo(itemToDraw.x2, itemToDraw.y2);
            }
  
            context.stroke();
            context.restore();
          }
  
          if (optionTicks.display) {
            // Make sure we draw text in the correct color and font
            context.save();
            context.translate(itemToDraw.labelX, itemToDraw.labelY);
            context.rotate(itemToDraw.rotation);
            context.font = itemToDraw.major ? majorTickFont.string : tickFont.string;
            context.fillStyle = itemToDraw.major ? majorTickFontColor : tickFontColor;
            context.textBaseline = 'middle';
            context.textAlign = itemToDraw.textAlign;
  
            var label = itemToDraw.label;
            var y = itemToDraw.textOffset;
            if (helpers$1.isArray(label)) {
              for (var i = 0; i < label.length; ++i) {
                // We just make sure the multiline element is a string here..
                context.fillText('' + label[i], 0, y);
                y += lineHeight;
              }
            } else {
              context.fillText(label, 0, y);
            }
            context.restore();
          }
        });
  
        if (scaleLabel.display) {
          // Draw the scale label
          var scaleLabelX;
          var scaleLabelY;
          var rotation = 0;
          var halfLineHeight = scaleLabelFont.lineHeight / 2;
  
          if (isHorizontal) {
            scaleLabelX = me.left + ((me.right - me.left) / 2); // midpoint of the width
            scaleLabelY = position === 'bottom'
                ? me.bottom - halfLineHeight - scaleLabelPadding.bottom
                : me.top + halfLineHeight + scaleLabelPadding.top;
          } else {
            var isLeft = position === 'left';
            scaleLabelX = isLeft
                ? me.left + halfLineHeight + scaleLabelPadding.top
                : me.right - halfLineHeight - scaleLabelPadding.top;
            scaleLabelY = me.top + ((me.bottom - me.top) / 2);
            rotation = isLeft ? -0.5 * Math.PI : 0.5 * Math.PI;
          }
  
          context.save();
          context.translate(scaleLabelX, scaleLabelY);
          context.rotate(rotation);
          context.textAlign = 'center';
          context.textBaseline = 'middle';
          context.fillStyle = scaleLabelFontColor; // render in correct colour
          context.font = scaleLabelFont.string;
          context.fillText(scaleLabel.labelString, 0, 0);
          context.restore();
        }
  
        if (axisWidth) {
          // Draw the line at the edge of the axis
          var firstLineWidth = axisWidth;
          var lastLineWidth = valueAtIndexOrDefault(gridLines.lineWidth, ticks.length - 1, 0);
          var x1, x2, y1, y2;
  
          if (isHorizontal) {
            x1 = alignPixel(chart, me.left, firstLineWidth) - firstLineWidth / 2;
            x2 = alignPixel(chart, me.right, lastLineWidth) + lastLineWidth / 2;
            y1 = y2 = borderValue;
          } else {
            y1 = alignPixel(chart, me.top, firstLineWidth) - firstLineWidth / 2;
            y2 = alignPixel(chart, me.bottom, lastLineWidth) + lastLineWidth / 2;
            x1 = x2 = borderValue;
          }
  
          context.lineWidth = axisWidth;
          context.strokeStyle = valueAtIndexOrDefault(gridLines.color, 0);
          context.beginPath();
          context.moveTo(x1, y1);
          context.lineTo(x2, y2);
          context.stroke();
        }
      }
    });
  
    var defaultConfig = {
      position: 'bottom'
    };
  
    var scale_category = core_scale.extend({
      /**
       * Internal function to get the correct labels. If data.xLabels or data.yLabels are defined, use those
       * else fall back to data.labels
       * @private
       */
      getLabels: function () {
        var data = this.chart.data;
        return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels;
      },
  
      determineDataLimits: function () {
        var me = this;
        var labels = me.getLabels();
        me.minIndex = 0;
        me.maxIndex = labels.length - 1;
        var findIndex;
  
        if (me.options.ticks.min !== undefined) {
          // user specified min value
          findIndex = labels.indexOf(me.options.ticks.min);
          me.minIndex = findIndex !== -1 ? findIndex : me.minIndex;
        }
  
        if (me.options.ticks.max !== undefined) {
          // user specified max value
          findIndex = labels.indexOf(me.options.ticks.max);
          me.maxIndex = findIndex !== -1 ? findIndex : me.maxIndex;
        }
  
        me.min = labels[me.minIndex];
        me.max = labels[me.maxIndex];
      },
  
      buildTicks: function () {
        var me = this;
        var labels = me.getLabels();
        // If we are viewing some subset of labels, slice the original array
        me.ticks = (me.minIndex === 0 && me.maxIndex === labels.length - 1) ? labels : labels.slice(me.minIndex, me.maxIndex + 1);
      },
  
      getLabelForIndex: function (index, datasetIndex) {
        var me = this;
        var chart = me.chart;
  
        if (chart.getDatasetMeta(datasetIndex).controller._getValueScaleId() === me.id) {
          return me.getRightValue(chart.data.datasets[datasetIndex].data[index]);
        }
  
        return me.ticks[index - me.minIndex];
      },
  
      // Used to get data value locations.  Value can either be an index or a numerical value
      getPixelForValue: function (value, index) {
        var me = this;
        var offset = me.options.offset;
        // 1 is added because we need the length but we have the indexes
        var offsetAmt = Math.max((me.maxIndex + 1 - me.minIndex - (offset ? 0 : 1)), 1);
  
        // If value is a data object, then index is the index in the data array,
        // not the index of the scale. We need to change that.
        var valueCategory;
        if (value !== undefined && value !== null) {
          valueCategory = me.isHorizontal() ? value.x : value.y;
        }
        if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
          var labels = me.getLabels();
          value = valueCategory || value;
          var idx = labels.indexOf(value);
          index = idx !== -1 ? idx : index;
        }
  
        if (me.isHorizontal()) {
          var valueWidth = me.width / offsetAmt;
          var widthOffset = (valueWidth * (index - me.minIndex));
  
          if (offset) {
            widthOffset += (valueWidth / 2);
          }
  
          return me.left + widthOffset;
        }
        var valueHeight = me.height / offsetAmt;
        var heightOffset = (valueHeight * (index - me.minIndex));
  
        if (offset) {
          heightOffset += (valueHeight / 2);
        }
  
        return me.top + heightOffset;
      },
  
      getPixelForTick: function (index) {
        return this.getPixelForValue(this.ticks[index], index + this.minIndex, null);
      },
  
      getValueForPixel: function (pixel) {
        var me = this;
        var offset = me.options.offset;
        var value;
        var offsetAmt = Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
        var horz = me.isHorizontal();
        var valueDimension = (horz ? me.width : me.height) / offsetAmt;
  
        pixel -= horz ? me.left : me.top;
  
        if (offset) {
          pixel -= (valueDimension / 2);
        }
  
        if (pixel <= 0) {
          value = 0;
        } else {
          value = Math.round(pixel / valueDimension);
        }
  
        return value + me.minIndex;
      },
  
      getBasePixel: function () {
        return this.bottom;
      }
    });
  
  // INTERNAL: static default options, registered in src/index.js
    var _defaults = defaultConfig;
    scale_category._defaults = _defaults;
  
    var noop = helpers$1.noop;
    var isNullOrUndef = helpers$1.isNullOrUndef;
  
    /**
     * Generate a set of linear ticks
     * @param generationOptions the options used to generate the ticks
     * @param dataRange the range of the data
     * @returns {number[]} array of tick values
     */
    function generateTicks(generationOptions, dataRange) {
      var ticks = [];
      // To get a "nice" value for the tick spacing, we will use the appropriately named
      // "nice number" algorithm. See https://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
      // for details.
  
      var MIN_SPACING = 1e-14;
      var stepSize = generationOptions.stepSize;
      var unit = stepSize || 1;
      var maxNumSpaces = generationOptions.maxTicks - 1;
      var min = generationOptions.min;
      var max = generationOptions.max;
      var precision = generationOptions.precision;
      var rmin = dataRange.min;
      var rmax = dataRange.max;
      var spacing = helpers$1.niceNum((rmax - rmin) / maxNumSpaces / unit) * unit;
      var factor, niceMin, niceMax, numSpaces;
  
      // Beyond MIN_SPACING floating point numbers being to lose precision
      // such that we can't do the math necessary to generate ticks
      if (spacing < MIN_SPACING && isNullOrUndef(min) && isNullOrUndef(max)) {
        return [rmin, rmax];
      }
  
      numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
      if (numSpaces > maxNumSpaces) {
        // If the calculated num of spaces exceeds maxNumSpaces, recalculate it
        spacing = helpers$1.niceNum(numSpaces * spacing / maxNumSpaces / unit) * unit;
      }
  
      if (stepSize || isNullOrUndef(precision)) {
        // If a precision is not specified, calculate factor based on spacing
        factor = Math.pow(10, helpers$1._decimalPlaces(spacing));
      } else {
        // If the user specified a precision, round to that number of decimal places
        factor = Math.pow(10, precision);
        spacing = Math.ceil(spacing * factor) / factor;
      }
  
      niceMin = Math.floor(rmin / spacing) * spacing;
      niceMax = Math.ceil(rmax / spacing) * spacing;
  
      // If min, max and stepSize is set and they make an evenly spaced scale use it.
      if (stepSize) {
        // If very close to our whole number, use it.
        if (!isNullOrUndef(min) && helpers$1.almostWhole(min / spacing, spacing / 1000)) {
          niceMin = min;
        }
        if (!isNullOrUndef(max) && helpers$1.almostWhole(max / spacing, spacing / 1000)) {
          niceMax = max;
        }
      }
  
      numSpaces = (niceMax - niceMin) / spacing;
      // If very close to our rounded value, use it.
      if (helpers$1.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
        numSpaces = Math.round(numSpaces);
      } else {
        numSpaces = Math.ceil(numSpaces);
      }
  
      niceMin = Math.round(niceMin * factor) / factor;
      niceMax = Math.round(niceMax * factor) / factor;
      ticks.push(isNullOrUndef(min) ? niceMin : min);
      for (var j = 1; j < numSpaces; ++j) {
        ticks.push(Math.round((niceMin + j * spacing) * factor) / factor);
      }
      ticks.push(isNullOrUndef(max) ? niceMax : max);
  
      return ticks;
    }
  
    var scale_linearbase = core_scale.extend({
      getRightValue: function (value) {
        if (typeof value === 'string') {
          return +value;
        }
        return core_scale.prototype.getRightValue.call(this, value);
      },
  
      handleTickRangeOptions: function () {
        var me = this;
        var opts = me.options;
        var tickOpts = opts.ticks;
  
        // If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
        // do nothing since that would make the chart weird. If the user really wants a weird chart
        // axis, they can manually override it
        if (tickOpts.beginAtZero) {
          var minSign = helpers$1.sign(me.min);
          var maxSign = helpers$1.sign(me.max);
  
          if (minSign < 0 && maxSign < 0) {
            // move the top up to 0
            me.max = 0;
          } else if (minSign > 0 && maxSign > 0) {
            // move the bottom down to 0
            me.min = 0;
          }
        }
  
        var setMin = tickOpts.min !== undefined || tickOpts.suggestedMin !== undefined;
        var setMax = tickOpts.max !== undefined || tickOpts.suggestedMax !== undefined;
  
        if (tickOpts.min !== undefined) {
          me.min = tickOpts.min;
        } else if (tickOpts.suggestedMin !== undefined) {
          if (me.min === null) {
            me.min = tickOpts.suggestedMin;
          } else {
            me.min = Math.min(me.min, tickOpts.suggestedMin);
          }
        }
  
        if (tickOpts.max !== undefined) {
          me.max = tickOpts.max;
        } else if (tickOpts.suggestedMax !== undefined) {
          if (me.max === null) {
            me.max = tickOpts.suggestedMax;
          } else {
            me.max = Math.max(me.max, tickOpts.suggestedMax);
          }
        }
  
        if (setMin !== setMax) {
          // We set the min or the max but not both.
          // So ensure that our range is good
          // Inverted or 0 length range can happen when
          // ticks.min is set, and no datasets are visible
          if (me.min >= me.max) {
            if (setMin) {
              me.max = me.min + 1;
            } else {
              me.min = me.max - 1;
            }
          }
        }
  
        if (me.min === me.max) {
          me.max++;
  
          if (!tickOpts.beginAtZero) {
            me.min--;
          }
        }
      },
  
      getTickLimit: function () {
        var me = this;
        var tickOpts = me.options.ticks;
        var stepSize = tickOpts.stepSize;
        var maxTicksLimit = tickOpts.maxTicksLimit;
        var maxTicks;
  
        if (stepSize) {
          maxTicks = Math.ceil(me.max / stepSize) - Math.floor(me.min / stepSize) + 1;
        } else {
          maxTicks = me._computeTickLimit();
          maxTicksLimit = maxTicksLimit || 11;
        }
  
        if (maxTicksLimit) {
          maxTicks = Math.min(maxTicksLimit, maxTicks);
        }
  
        return maxTicks;
      },
  
      _computeTickLimit: function () {
        return Number.POSITIVE_INFINITY;
      },
  
      handleDirectionalChanges: noop,
  
      buildTicks: function () {
        var me = this;
        var opts = me.options;
        var tickOpts = opts.ticks;
  
        // Figure out what the max number of ticks we can support it is based on the size of
        // the axis area. For now, we say that the minimum tick spacing in pixels must be 40
        // We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
        // the graph. Make sure we always have at least 2 ticks
        var maxTicks = me.getTickLimit();
        maxTicks = Math.max(2, maxTicks);
  
        var numericGeneratorOptions = {
          maxTicks: maxTicks,
          min: tickOpts.min,
          max: tickOpts.max,
          precision: tickOpts.precision,
          stepSize: helpers$1.valueOrDefault(tickOpts.fixedStepSize, tickOpts.stepSize)
        };
        var ticks = me.ticks = generateTicks(numericGeneratorOptions, me);
  
        me.handleDirectionalChanges();
  
        // At this point, we need to update our max and min given the tick values since we have expanded the
        // range of the scale
        me.max = helpers$1.max(ticks);
        me.min = helpers$1.min(ticks);
  
        if (tickOpts.reverse) {
          ticks.reverse();
  
          me.start = me.max;
          me.end = me.min;
        } else {
          me.start = me.min;
          me.end = me.max;
        }
      },
  
      convertTicksToLabels: function () {
        var me = this;
        me.ticksAsNumbers = me.ticks.slice();
        me.zeroLineIndex = me.ticks.indexOf(0);
  
        core_scale.prototype.convertTicksToLabels.call(me);
      }
    });
  
    var defaultConfig$1 = {
      position: 'left',
      ticks: {
        callback: core_ticks.formatters.linear
      }
    };
  
    var scale_linear = scale_linearbase.extend({
      determineDataLimits: function () {
        var me = this;
        var opts = me.options;
        var chart = me.chart;
        var data = chart.data;
        var datasets = data.datasets;
        var isHorizontal = me.isHorizontal();
        var DEFAULT_MIN = 0;
        var DEFAULT_MAX = 1;
  
        function IDMatches(meta) {
          return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
        }
  
        // First Calculate the range
        me.min = null;
        me.max = null;
  
        var hasStacks = opts.stacked;
        if (hasStacks === undefined) {
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            if (hasStacks) {
              return;
            }
  
            var meta = chart.getDatasetMeta(datasetIndex);
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
                meta.stack !== undefined) {
              hasStacks = true;
            }
          });
        }
  
        if (opts.stacked || hasStacks) {
          var valuesPerStack = {};
  
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            var meta = chart.getDatasetMeta(datasetIndex);
            var key = [
              meta.type,
              // we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
              ((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
              meta.stack
            ].join('.');
  
            if (valuesPerStack[key] === undefined) {
              valuesPerStack[key] = {
                positiveValues: [],
                negativeValues: []
              };
            }
  
            // Store these per type
            var positiveValues = valuesPerStack[key].positiveValues;
            var negativeValues = valuesPerStack[key].negativeValues;
  
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
              helpers$1.each(dataset.data, function (rawValue, index) {
                var value = +me.getRightValue(rawValue);
                if (isNaN(value) || meta.data[index].hidden) {
                  return;
                }
  
                positiveValues[index] = positiveValues[index] || 0;
                negativeValues[index] = negativeValues[index] || 0;
  
                if (opts.relativePoints) {
                  positiveValues[index] = 100;
                } else if (value < 0) {
                  negativeValues[index] += value;
                } else {
                  positiveValues[index] += value;
                }
              });
            }
          });
  
          helpers$1.each(valuesPerStack, function (valuesForType) {
            var values = valuesForType.positiveValues.concat(valuesForType.negativeValues);
            var minVal = helpers$1.min(values);
            var maxVal = helpers$1.max(values);
            me.min = me.min === null ? minVal : Math.min(me.min, minVal);
            me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
          });
  
        } else {
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            var meta = chart.getDatasetMeta(datasetIndex);
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
              helpers$1.each(dataset.data, function (rawValue, index) {
                var value = +me.getRightValue(rawValue);
                if (isNaN(value) || meta.data[index].hidden) {
                  return;
                }
  
                if (me.min === null) {
                  me.min = value;
                } else if (value < me.min) {
                  me.min = value;
                }
  
                if (me.max === null) {
                  me.max = value;
                } else if (value > me.max) {
                  me.max = value;
                }
              });
            }
          });
        }
  
        me.min = isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
        me.max = isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;
  
        // Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
        this.handleTickRangeOptions();
      },
  
      // Returns the maximum number of ticks based on the scale dimension
      _computeTickLimit: function () {
        var me = this;
        var tickFont;
  
        if (me.isHorizontal()) {
          return Math.ceil(me.width / 40);
        }
        tickFont = helpers$1.options._parseFont(me.options.ticks);
        return Math.ceil(me.height / tickFont.lineHeight);
      },
  
      // Called after the ticks are built. We need
      handleDirectionalChanges: function () {
        if (!this.isHorizontal()) {
          // We are in a vertical orientation. The top value is the highest. So reverse the array
          this.ticks.reverse();
        }
      },
  
      getLabelForIndex: function (index, datasetIndex) {
        return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
      },
  
      // Utils
      getPixelForValue: function (value) {
        // This must be called after fit has been run so that
        // this.left, this.top, this.right, and this.bottom have been defined
        var me = this;
        var start = me.start;
  
        var rightValue = +me.getRightValue(value);
        var pixel;
        var range = me.end - start;
  
        if (me.isHorizontal()) {
          pixel = me.left + (me.width / range * (rightValue - start));
        } else {
          pixel = me.bottom - (me.height / range * (rightValue - start));
        }
        return pixel;
      },
  
      getValueForPixel: function (pixel) {
        var me = this;
        var isHorizontal = me.isHorizontal();
        var innerDimension = isHorizontal ? me.width : me.height;
        var offset = (isHorizontal ? pixel - me.left : me.bottom - pixel) / innerDimension;
        return me.start + ((me.end - me.start) * offset);
      },
  
      getPixelForTick: function (index) {
        return this.getPixelForValue(this.ticksAsNumbers[index]);
      }
    });
  
  // INTERNAL: static default options, registered in src/index.js
    var _defaults$1 = defaultConfig$1;
    scale_linear._defaults = _defaults$1;
  
    var valueOrDefault$a = helpers$1.valueOrDefault;
  
    /**
     * Generate a set of logarithmic ticks
     * @param generationOptions the options used to generate the ticks
     * @param dataRange the range of the data
     * @returns {number[]} array of tick values
     */
    function generateTicks$1(generationOptions, dataRange) {
      var ticks = [];
  
      var tickVal = valueOrDefault$a(generationOptions.min, Math.pow(10, Math.floor(helpers$1.log10(dataRange.min))));
  
      var endExp = Math.floor(helpers$1.log10(dataRange.max));
      var endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
      var exp, significand;
  
      if (tickVal === 0) {
        exp = Math.floor(helpers$1.log10(dataRange.minNotZero));
        significand = Math.floor(dataRange.minNotZero / Math.pow(10, exp));
  
        ticks.push(tickVal);
        tickVal = significand * Math.pow(10, exp);
      } else {
        exp = Math.floor(helpers$1.log10(tickVal));
        significand = Math.floor(tickVal / Math.pow(10, exp));
      }
      var precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;
  
      do {
        ticks.push(tickVal);
  
        ++significand;
        if (significand === 10) {
          significand = 1;
          ++exp;
          precision = exp >= 0 ? 1 : precision;
        }
  
        tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
      } while (exp < endExp || (exp === endExp && significand < endSignificand));
  
      var lastTick = valueOrDefault$a(generationOptions.max, tickVal);
      ticks.push(lastTick);
  
      return ticks;
    }
  
    var defaultConfig$2 = {
      position: 'left',
  
      // label settings
      ticks: {
        callback: core_ticks.formatters.logarithmic
      }
    };
  
  // TODO(v3): change this to positiveOrDefault
    function nonNegativeOrDefault(value, defaultValue) {
      return helpers$1.isFinite(value) && value >= 0 ? value : defaultValue;
    }
  
    var scale_logarithmic = core_scale.extend({
      determineDataLimits: function () {
        var me = this;
        var opts = me.options;
        var chart = me.chart;
        var data = chart.data;
        var datasets = data.datasets;
        var isHorizontal = me.isHorizontal();
  
        function IDMatches(meta) {
          return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
        }
  
        // Calculate Range
        me.min = null;
        me.max = null;
        me.minNotZero = null;
  
        var hasStacks = opts.stacked;
        if (hasStacks === undefined) {
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            if (hasStacks) {
              return;
            }
  
            var meta = chart.getDatasetMeta(datasetIndex);
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
                meta.stack !== undefined) {
              hasStacks = true;
            }
          });
        }
  
        if (opts.stacked || hasStacks) {
          var valuesPerStack = {};
  
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            var meta = chart.getDatasetMeta(datasetIndex);
            var key = [
              meta.type,
              // we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
              ((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
              meta.stack
            ].join('.');
  
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
              if (valuesPerStack[key] === undefined) {
                valuesPerStack[key] = [];
              }
  
              helpers$1.each(dataset.data, function (rawValue, index) {
                var values = valuesPerStack[key];
                var value = +me.getRightValue(rawValue);
                // invalid, hidden and negative values are ignored
                if (isNaN(value) || meta.data[index].hidden || value < 0) {
                  return;
                }
                values[index] = values[index] || 0;
                values[index] += value;
              });
            }
          });
  
          helpers$1.each(valuesPerStack, function (valuesForType) {
            if (valuesForType.length > 0) {
              var minVal = helpers$1.min(valuesForType);
              var maxVal = helpers$1.max(valuesForType);
              me.min = me.min === null ? minVal : Math.min(me.min, minVal);
              me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
            }
          });
  
        } else {
          helpers$1.each(datasets, function (dataset, datasetIndex) {
            var meta = chart.getDatasetMeta(datasetIndex);
            if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
              helpers$1.each(dataset.data, function (rawValue, index) {
                var value = +me.getRightValue(rawValue);
                // invalid, hidden and negative values are ignored
                if (isNaN(value) || meta.data[index].hidden || value < 0) {
                  return;
                }
  
                if (me.min === null) {
                  me.min = value;
                } else if (value < me.min) {
                  me.min = value;
                }
  
                if (me.max === null) {
                  me.max = value;
                } else if (value > me.max) {
                  me.max = value;
                }
  
                if (value !== 0 && (me.minNotZero === null || value < me.minNotZero)) {
                  me.minNotZero = value;
                }
              });
            }
          });
        }
  
        // Common base implementation to handle ticks.min, ticks.max
        this.handleTickRangeOptions();
      },
  
      handleTickRangeOptions: function () {
        var me = this;
        var tickOpts = me.options.ticks;
        var DEFAULT_MIN = 1;
        var DEFAULT_MAX = 10;
  
        me.min = nonNegativeOrDefault(tickOpts.min, me.min);
        me.max = nonNegativeOrDefault(tickOpts.max, me.max);
  
        if (me.min === me.max) {
          if (me.min !== 0 && me.min !== null) {
            me.min = Math.pow(10, Math.floor(helpers$1.log10(me.min)) - 1);
            me.max = Math.pow(10, Math.floor(helpers$1.log10(me.max)) + 1);
          } else {
            me.min = DEFAULT_MIN;
            me.max = DEFAULT_MAX;
          }
        }
        if (me.min === null) {
          me.min = Math.pow(10, Math.floor(helpers$1.log10(me.max)) - 1);
        }
        if (me.max === null) {
          me.max = me.min !== 0
              ? Math.pow(10, Math.floor(helpers$1.log10(me.min)) + 1)
              : DEFAULT_MAX;
        }
        if (me.minNotZero === null) {
          if (me.min > 0) {
            me.minNotZero = me.min;
          } else if (me.max < 1) {
            me.minNotZero = Math.pow(10, Math.floor(helpers$1.log10(me.max)));
          } else {
            me.minNotZero = DEFAULT_MIN;
          }
        }
      },
  
      buildTicks: function () {
        var me = this;
        var tickOpts = me.options.ticks;
        var reverse = !me.isHorizontal();
  
        var generationOptions = {
          min: nonNegativeOrDefault(tickOpts.min),
          max: nonNegativeOrDefault(tickOpts.max)
        };
        var ticks = me.ticks = generateTicks$1(generationOptions, me);
  
        // At this point, we need to update our max and min given the tick values since we have expanded the
        // range of the scale
        me.max = helpers$1.max(ticks);
        me.min = helpers$1.min(ticks);
  
        if (tickOpts.reverse) {
          reverse = !reverse;
          me.start = me.max;
          me.end = me.min;
        } else {
          me.start = me.min;
          me.end = me.max;
        }
        if (reverse) {
          ticks.reverse();
        }
      },
  
      convertTicksToLabels: function () {
        this.tickValues = this.ticks.slice();
  
        core_scale.prototype.convertTicksToLabels.call(this);
      },
  
      // Get the correct tooltip label
      getLabelForIndex: function (index, datasetIndex) {
        return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
      },
  
      getPixelForTick: function (index) {
        return this.getPixelForValue(this.tickValues[index]);
      },
  
      /**
       * Returns the value of the first tick.
       * @param {number} value - The minimum not zero value.
       * @return {number} The first tick value.
       * @private
       */
      _getFirstTickValue: function (value) {
        var exp = Math.floor(helpers$1.log10(value));
        var significand = Math.floor(value / Math.pow(10, exp));
  
        return significand * Math.pow(10, exp);
      },
  
      getPixelForValue: function (value) {
        var me = this;
        var tickOpts = me.options.ticks;
        var reverse = tickOpts.reverse;
        var log10 = helpers$1.log10;
        var firstTickValue = me._getFirstTickValue(me.minNotZero);
        var offset = 0;
        var innerDimension, pixel, start, end, sign;
  
        value = +me.getRightValue(value);
        if (reverse) {
          start = me.end;
          end = me.start;
          sign = -1;
        } else {
          start = me.start;
          end = me.end;
          sign = 1;
        }
        if (me.isHorizontal()) {
          innerDimension = me.width;
          pixel = reverse ? me.right : me.left;
        } else {
          innerDimension = me.height;
          sign *= -1; // invert, since the upper-left corner of the canvas is at pixel (0, 0)
          pixel = reverse ? me.top : me.bottom;
        }
        if (value !== start) {
          if (start === 0) { // include zero tick
            offset = valueOrDefault$a(tickOpts.fontSize, core_defaults.global.defaultFontSize);
            innerDimension -= offset;
            start = firstTickValue;
          }
          if (value !== 0) {
            offset += innerDimension / (log10(end) - log10(start)) * (log10(value) - log10(start));
          }
          pixel += sign * offset;
        }
        return pixel;
      },
  
      getValueForPixel: function (pixel) {
        var me = this;
        var tickOpts = me.options.ticks;
        var reverse = tickOpts.reverse;
        var log10 = helpers$1.log10;
        var firstTickValue = me._getFirstTickValue(me.minNotZero);
        var innerDimension, start, end, value;
  
        if (reverse) {
          start = me.end;
          end = me.start;
        } else {
          start = me.start;
          end = me.end;
        }
        if (me.isHorizontal()) {
          innerDimension = me.width;
          value = reverse ? me.right - pixel : pixel - me.left;
        } else {
          innerDimension = me.height;
          value = reverse ? pixel - me.top : me.bottom - pixel;
        }
        if (value !== start) {
          if (start === 0) { // include zero tick
            var offset = valueOrDefault$a(tickOpts.fontSize, core_defaults.global.defaultFontSize);
            value -= offset;
            innerDimension -= offset;
            start = firstTickValue;
          }
          value *= log10(end) - log10(start);
          value /= innerDimension;
          value = Math.pow(10, log10(start) + value);
        }
        return value;
      }
    });
  
  // INTERNAL: static default options, registered in src/index.js
    var _defaults$2 = defaultConfig$2;
    scale_logarithmic._defaults = _defaults$2;
  
    var valueOrDefault$b = helpers$1.valueOrDefault;
    var valueAtIndexOrDefault$1 = helpers$1.valueAtIndexOrDefault;
    var resolve$7 = helpers$1.options.resolve;
  
    var defaultConfig$3 = {
      display: true,
  
      // Boolean - Whether to animate scaling the chart from the centre
      animate: true,
      position: 'chartArea',
  
      angleLines: {
        display: true,
        color: 'rgba(0, 0, 0, 0.1)',
        lineWidth: 1,
        borderDash: [],
        borderDashOffset: 0.0
      },
  
      gridLines: {
        circular: false
      },
  
      // label settings
      ticks: {
        // Boolean - Show a backdrop to the scale label
        showLabelBackdrop: true,
  
        // String - The colour of the label backdrop
        backdropColor: 'rgba(255,255,255,0.75)',
  
        // Number - The backdrop padding above & below the label in pixels
        backdropPaddingY: 2,
  
        // Number - The backdrop padding to the side of the label in pixels
        backdropPaddingX: 2,
  
        callback: core_ticks.formatters.linear
      },
  
      pointLabels: {
        // Boolean - if true, show point labels
        display: true,
  
        // Number - Point label font size in pixels
        fontSize: 10,
  
        // Function - Used to convert point labels
        callback: function (label) {
          return label;
        }
      }
    };
  
    function getValueCount(scale) {
      var opts = scale.options;
      return opts.angleLines.display || opts.pointLabels.display ? scale.chart.data.labels.length : 0;
    }
  
    function getTickBackdropHeight(opts) {
      var tickOpts = opts.ticks;
  
      if (tickOpts.display && opts.display) {
        return valueOrDefault$b(tickOpts.fontSize, core_defaults.global.defaultFontSize) + tickOpts.backdropPaddingY * 2;
      }
      return 0;
    }
  
    function measureLabelSize(ctx, lineHeight, label) {
      if (helpers$1.isArray(label)) {
        return {
          w: helpers$1.longestText(ctx, ctx.font, label),
          h: label.length * lineHeight
        };
      }
  
      return {
        w: ctx.measureText(label).width,
        h: lineHeight
      };
    }
  
    function determineLimits(angle, pos, size, min, max) {
      if (angle === min || angle === max) {
        return {
          start: pos - (size / 2),
          end: pos + (size / 2)
        };
      } else if (angle < min || angle > max) {
        return {
          start: pos - size,
          end: pos
        };
      }
  
      return {
        start: pos,
        end: pos + size
      };
    }
  
    /**
     * Helper function to fit a radial linear scale with point labels
     */
    function fitWithPointLabels(scale) {
  
      // Right, this is really confusing and there is a lot of maths going on here
      // The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
      //
      // Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
      //
      // Solution:
      //
      // We assume the radius of the polygon is half the size of the canvas at first
      // at each index we check if the text overlaps.
      //
      // Where it does, we store that angle and that index.
      //
      // After finding the largest index and angle we calculate how much we need to remove
      // from the shape radius to move the point inwards by that x.
      //
      // We average the left and right distances to get the maximum shape radius that can fit in the box
      // along with labels.
      //
      // Once we have that, we can find the centre point for the chart, by taking the x text protrusion
      // on each side, removing that from the size, halving it and adding the left x protrusion width.
      //
      // This will mean we have a shape fitted to the canvas, as large as it can be with the labels
      // and position it in the most space efficient manner
      //
      // https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
  
      var plFont = helpers$1.options._parseFont(scale.options.pointLabels);
  
      // Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
      // Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
      var furthestLimits = {
        l: 0,
        r: scale.width,
        t: 0,
        b: scale.height - scale.paddingTop
      };
      var furthestAngles = {};
      var i, textSize, pointPosition;
  
      scale.ctx.font = plFont.string;
      scale._pointLabelSizes = [];
  
      var valueCount = getValueCount(scale);
      for (i = 0; i < valueCount; i++) {
        pointPosition = scale.getPointPosition(i, scale.drawingArea + 5);
        textSize = measureLabelSize(scale.ctx, plFont.lineHeight, scale.pointLabels[i] || '');
        scale._pointLabelSizes[i] = textSize;
  
        // Add quarter circle to make degree 0 mean top of circle
        var angleRadians = scale.getIndexAngle(i);
        var angle = helpers$1.toDegrees(angleRadians) % 360;
        var hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
        var vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);
  
        if (hLimits.start < furthestLimits.l) {
          furthestLimits.l = hLimits.start;
          furthestAngles.l = angleRadians;
        }
  
        if (hLimits.end > furthestLimits.r) {
          furthestLimits.r = hLimits.end;
          furthestAngles.r = angleRadians;
        }
  
        if (vLimits.start < furthestLimits.t) {
          furthestLimits.t = vLimits.start;
          furthestAngles.t = angleRadians;
        }
  
        if (vLimits.end > furthestLimits.b) {
          furthestLimits.b = vLimits.end;
          furthestAngles.b = angleRadians;
        }
      }
  
      scale.setReductions(scale.drawingArea, furthestLimits, furthestAngles);
    }
  
    function getTextAlignForAngle(angle) {
      if (angle === 0 || angle === 180) {
        return 'center';
      } else if (angle < 180) {
        return 'left';
      }
  
      return 'right';
    }
  
    function fillText(ctx, text, position, lineHeight) {
      var y = position.y + lineHeight / 2;
      var i, ilen;
  
      if (helpers$1.isArray(text)) {
        for (i = 0, ilen = text.length; i < ilen; ++i) {
          ctx.fillText(text[i], position.x, y);
          y += lineHeight;
        }
      } else {
        ctx.fillText(text, position.x, y);
      }
    }
  
    function adjustPointPositionForLabelHeight(angle, textSize, position) {
      if (angle === 90 || angle === 270) {
        position.y -= (textSize.h / 2);
      } else if (angle > 270 || angle < 90) {
        position.y -= textSize.h;
      }
    }
  
    function drawPointLabels(scale) {
      var ctx = scale.ctx;
      var opts = scale.options;
      var angleLineOpts = opts.angleLines;
      var gridLineOpts = opts.gridLines;
      var pointLabelOpts = opts.pointLabels;
      var lineWidth = valueOrDefault$b(angleLineOpts.lineWidth, gridLineOpts.lineWidth);
      var lineColor = valueOrDefault$b(angleLineOpts.color, gridLineOpts.color);
      var tickBackdropHeight = getTickBackdropHeight(opts);
  
      ctx.save();
      ctx.lineWidth = lineWidth;
      ctx.strokeStyle = lineColor;
      if (ctx.setLineDash) {
        ctx.setLineDash(resolve$7([angleLineOpts.borderDash, gridLineOpts.borderDash, []]));
        ctx.lineDashOffset = resolve$7([angleLineOpts.borderDashOffset, gridLineOpts.borderDashOffset, 0.0]);
      }
  
      var outerDistance = scale.getDistanceFromCenterForValue(opts.ticks.reverse ? scale.min : scale.max);
  
      // Point Label Font
      var plFont = helpers$1.options._parseFont(pointLabelOpts);
  
      ctx.font = plFont.string;
      ctx.textBaseline = 'middle';
  
      for (var i = getValueCount(scale) - 1; i >= 0; i--) {
        if (angleLineOpts.display && lineWidth && lineColor) {
          var outerPosition = scale.getPointPosition(i, outerDistance);
          ctx.beginPath();
          ctx.moveTo(scale.xCenter, scale.yCenter);
          ctx.lineTo(outerPosition.x, outerPosition.y);
          ctx.stroke();
        }
  
        if (pointLabelOpts.display) {
          // Extra pixels out for some label spacing
          var extra = (i === 0 ? tickBackdropHeight / 2 : 0);
          var pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + 5);
  
          // Keep this in loop since we may support array properties here
          var pointLabelFontColor = valueAtIndexOrDefault$1(pointLabelOpts.fontColor, i, core_defaults.global.defaultFontColor);
          ctx.fillStyle = pointLabelFontColor;
  
          var angleRadians = scale.getIndexAngle(i);
          var angle = helpers$1.toDegrees(angleRadians);
          ctx.textAlign = getTextAlignForAngle(angle);
          adjustPointPositionForLabelHeight(angle, scale._pointLabelSizes[i], pointLabelPosition);
          fillText(ctx, scale.pointLabels[i] || '', pointLabelPosition, plFont.lineHeight);
        }
      }
      ctx.restore();
    }
  
    function drawRadiusLine(scale, gridLineOpts, radius, index) {
      var ctx = scale.ctx;
      var circular = gridLineOpts.circular;
      var valueCount = getValueCount(scale);
      var lineColor = valueAtIndexOrDefault$1(gridLineOpts.color, index - 1);
      var lineWidth = valueAtIndexOrDefault$1(gridLineOpts.lineWidth, index - 1);
      var pointPosition;
  
      if ((!circular && !valueCount) || !lineColor || !lineWidth) {
        return;
      }
  
      ctx.save();
      ctx.strokeStyle = lineColor;
      ctx.lineWidth = lineWidth;
      if (ctx.setLineDash) {
        ctx.setLineDash(gridLineOpts.borderDash || []);
        ctx.lineDashOffset = gridLineOpts.borderDashOffset || 0.0;
      }
  
      ctx.beginPath();
      if (circular) {
        // Draw circular arcs between the points
        ctx.arc(scale.xCenter, scale.yCenter, radius, 0, Math.PI * 2);
      } else {
        // Draw straight lines connecting each index
        pointPosition = scale.getPointPosition(0, radius);
        ctx.moveTo(pointPosition.x, pointPosition.y);
  
        for (var i = 1; i < valueCount; i++) {
          pointPosition = scale.getPointPosition(i, radius);
          ctx.lineTo(pointPosition.x, pointPosition.y);
        }
      }
      ctx.closePath();
      ctx.stroke();
      ctx.restore();
    }
  
    function numberOrZero(param) {
      return helpers$1.isNumber(param) ? param : 0;
    }
  
    var scale_radialLinear = scale_linearbase.extend({
      setDimensions: function () {
        var me = this;
  
        // Set the unconstrained dimension before label rotation
        me.width = me.maxWidth;
        me.height = me.maxHeight;
        me.paddingTop = getTickBackdropHeight(me.options) / 2;
        me.xCenter = Math.floor(me.width / 2);
        me.yCenter = Math.floor((me.height - me.paddingTop) / 2);
        me.drawingArea = Math.min(me.height - me.paddingTop, me.width) / 2;
      },
  
      determineDataLimits: function () {
        var me = this;
        var chart = me.chart;
        var min = Number.POSITIVE_INFINITY;
        var max = Number.NEGATIVE_INFINITY;
  
        helpers$1.each(chart.data.datasets, function (dataset, datasetIndex) {
          if (chart.isDatasetVisible(datasetIndex)) {
            var meta = chart.getDatasetMeta(datasetIndex);
  
            helpers$1.each(dataset.data, function (rawValue, index) {
              var value = +me.getRightValue(rawValue);
              if (isNaN(value) || meta.data[index].hidden) {
                return;
              }
  
              min = Math.min(value, min);
              max = Math.max(value, max);
            });
          }
        });
  
        me.min = (min === Number.POSITIVE_INFINITY ? 0 : min);
        me.max = (max === Number.NEGATIVE_INFINITY ? 0 : max);
  
        // Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
        me.handleTickRangeOptions();
      },
  
      // Returns the maximum number of ticks based on the scale dimension
      _computeTickLimit: function () {
        return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
      },
  
      convertTicksToLabels: function () {
        var me = this;
  
        scale_linearbase.prototype.convertTicksToLabels.call(me);
  
        // Point labels
        me.pointLabels = me.chart.data.labels.map(me.options.pointLabels.callback, me);
      },
  
      getLabelForIndex: function (index, datasetIndex) {
        return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
      },
  
      fit: function () {
        var me = this;
        var opts = me.options;
  
        if (opts.display && opts.pointLabels.display) {
          fitWithPointLabels(me);
        } else {
          me.setCenterPoint(0, 0, 0, 0);
        }
      },
  
      /**
       * Set radius reductions and determine new radius and center point
       * @private
       */
      setReductions: function (largestPossibleRadius, furthestLimits, furthestAngles) {
        var me = this;
        var radiusReductionLeft = furthestLimits.l / Math.sin(furthestAngles.l);
        var radiusReductionRight = Math.max(furthestLimits.r - me.width, 0) / Math.sin(furthestAngles.r);
        var radiusReductionTop = -furthestLimits.t / Math.cos(furthestAngles.t);
        var radiusReductionBottom = -Math.max(furthestLimits.b - (me.height - me.paddingTop), 0) / Math.cos(furthestAngles.b);
  
        radiusReductionLeft = numberOrZero(radiusReductionLeft);
        radiusReductionRight = numberOrZero(radiusReductionRight);
        radiusReductionTop = numberOrZero(radiusReductionTop);
        radiusReductionBottom = numberOrZero(radiusReductionBottom);
  
        me.drawingArea = Math.min(
            Math.floor(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2),
            Math.floor(largestPossibleRadius - (radiusReductionTop + radiusReductionBottom) / 2));
        me.setCenterPoint(radiusReductionLeft, radiusReductionRight, radiusReductionTop, radiusReductionBottom);
      },
  
      setCenterPoint: function (leftMovement, rightMovement, topMovement, bottomMovement) {
        var me = this;
        var maxRight = me.width - rightMovement - me.drawingArea;
        var maxLeft = leftMovement + me.drawingArea;
        var maxTop = topMovement + me.drawingArea;
        var maxBottom = (me.height - me.paddingTop) - bottomMovement - me.drawingArea;
  
        me.xCenter = Math.floor(((maxLeft + maxRight) / 2) + me.left);
        me.yCenter = Math.floor(((maxTop + maxBottom) / 2) + me.top + me.paddingTop);
      },
  
      getIndexAngle: function (index) {
        var angleMultiplier = (Math.PI * 2) / getValueCount(this);
        var startAngle = this.chart.options && this.chart.options.startAngle ?
            this.chart.options.startAngle :
            0;
  
        var startAngleRadians = startAngle * Math.PI * 2 / 360;
  
        // Start from the top instead of right, so remove a quarter of the circle
        return index * angleMultiplier + startAngleRadians;
      },
  
      getDistanceFromCenterForValue: function (value) {
        var me = this;
  
        if (value === null) {
          return 0; // null always in center
        }
  
        // Take into account half font size + the yPadding of the top value
        var scalingFactor = me.drawingArea / (me.max - me.min);
        if (me.options.ticks.reverse) {
          return (me.max - value) * scalingFactor;
        }
        return (value - me.min) * scalingFactor;
      },
  
      getPointPosition: function (index, distanceFromCenter) {
        var me = this;
        var thisAngle = me.getIndexAngle(index) - (Math.PI / 2);
        return {
          x: Math.cos(thisAngle) * distanceFromCenter + me.xCenter,
          y: Math.sin(thisAngle) * distanceFromCenter + me.yCenter
        };
      },
  
      getPointPositionForValue: function (index, value) {
        return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
      },
  
      getBasePosition: function () {
        var me = this;
        var min = me.min;
        var max = me.max;
  
        return me.getPointPositionForValue(0,
            me.beginAtZero ? 0 :
                min < 0 && max < 0 ? max :
                    min > 0 && max > 0 ? min :
                        0);
      },
  
      draw: function () {
        var me = this;
        var opts = me.options;
        var gridLineOpts = opts.gridLines;
        var tickOpts = opts.ticks;
  
        if (opts.display) {
          var ctx = me.ctx;
          var startAngle = this.getIndexAngle(0);
          var tickFont = helpers$1.options._parseFont(tickOpts);
  
          if (opts.angleLines.display || opts.pointLabels.display) {
            drawPointLabels(me);
          }
  
          helpers$1.each(me.ticks, function (label, index) {
            // Don't draw a centre value (if it is minimum)
            if (index > 0 || tickOpts.reverse) {
              var yCenterOffset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);
  
              // Draw circular lines around the scale
              if (gridLineOpts.display && index !== 0) {
                drawRadiusLine(me, gridLineOpts, yCenterOffset, index);
              }
  
              if (tickOpts.display) {
                var tickFontColor = valueOrDefault$b(tickOpts.fontColor, core_defaults.global.defaultFontColor);
                ctx.font = tickFont.string;
  
                ctx.save();
                ctx.translate(me.xCenter, me.yCenter);
                ctx.rotate(startAngle);
  
                if (tickOpts.showLabelBackdrop) {
                  var labelWidth = ctx.measureText(label).width;
                  ctx.fillStyle = tickOpts.backdropColor;
                  ctx.fillRect(
                      -labelWidth / 2 - tickOpts.backdropPaddingX,
                      -yCenterOffset - tickFont.size / 2 - tickOpts.backdropPaddingY,
                      labelWidth + tickOpts.backdropPaddingX * 2,
                      tickFont.size + tickOpts.backdropPaddingY * 2
                  );
                }
  
                ctx.textAlign = 'center';
                ctx.textBaseline = 'middle';
                ctx.fillStyle = tickFontColor;
                ctx.fillText(label, 0, -yCenterOffset);
                ctx.restore();
              }
            }
          });
        }
      }
    });
  
  // INTERNAL: static default options, registered in src/index.js
    var _defaults$3 = defaultConfig$3;
    scale_radialLinear._defaults = _defaults$3;
  
    var valueOrDefault$c = helpers$1.valueOrDefault;
  
  // Integer constants are from the ES6 spec.
    var MIN_INTEGER = Number.MIN_SAFE_INTEGER || -9007199254740991;
    var MAX_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;
  
    var INTERVALS = {
      millisecond: {
        common: true,
        size: 1,
        steps: [1, 2, 5, 10, 20, 50, 100, 250, 500]
      },
      second: {
        common: true,
        size: 1000,
        steps: [1, 2, 5, 10, 15, 30]
      },
      minute: {
        common: true,
        size: 60000,
        steps: [1, 2, 5, 10, 15, 30]
      },
      hour: {
        common: true,
        size: 3600000,
        steps: [1, 2, 3, 6, 12]
      },
      day: {
        common: true,
        size: 86400000,
        steps: [1, 2, 5]
      },
      week: {
        common: false,
        size: 604800000,
        steps: [1, 2, 3, 4]
      },
      month: {
        common: true,
        size: 2.628e9,
        steps: [1, 2, 3]
      },
      quarter: {
        common: false,
        size: 7.884e9,
        steps: [1, 2, 3, 4]
      },
      year: {
        common: true,
        size: 3.154e10
      }
    };
  
    var UNITS = Object.keys(INTERVALS);
  
    function sorter(a, b) {
      return a - b;
    }
  
    function arrayUnique(items) {
      var hash = {};
      var out = [];
      var i, ilen, item;
  
      for (i = 0, ilen = items.length; i < ilen; ++i) {
        item = items[i];
        if (!hash[item]) {
          hash[item] = true;
          out.push(item);
        }
      }
  
      return out;
    }
  
    /**
     * Returns an array of {time, pos} objects used to interpolate a specific `time` or position
     * (`pos`) on the scale, by searching entries before and after the requested value. `pos` is
     * a decimal between 0 and 1: 0 being the start of the scale (left or top) and 1 the other
     * extremity (left + width or top + height). Note that it would be more optimized to directly
     * store pre-computed pixels, but the scale dimensions are not guaranteed at the time we need
     * to create the lookup table. The table ALWAYS contains at least two items: min and max.
     *
     * @param {number[]} timestamps - timestamps sorted from lowest to highest.
     * @param {string} distribution - If 'linear', timestamps will be spread linearly along the min
     * and max range, so basically, the table will contains only two items: {min, 0} and {max, 1}.
     * If 'series', timestamps will be positioned at the same distance from each other. In this
     * case, only timestamps that break the time linearity are registered, meaning that in the
     * best case, all timestamps are linear, the table contains only min and max.
     */
    function buildLookupTable(timestamps, min, max, distribution) {
      if (distribution === 'linear' || !timestamps.length) {
        return [
          {time: min, pos: 0},
          {time: max, pos: 1}
        ];
      }
  
      var table = [];
      var items = [min];
      var i, ilen, prev, curr, next;
  
      for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
        curr = timestamps[i];
        if (curr > min && curr < max) {
          items.push(curr);
        }
      }
  
      items.push(max);
  
      for (i = 0, ilen = items.length; i < ilen; ++i) {
        next = items[i + 1];
        prev = items[i - 1];
        curr = items[i];
  
        // only add points that breaks the scale linearity
        if (prev === undefined || next === undefined || Math.round((next + prev) / 2) !== curr) {
          table.push({time: curr, pos: i / (ilen - 1)});
        }
      }
  
      return table;
    }
  
  // @see adapted from https://www.anujgakhar.com/2014/03/01/binary-search-in-javascript/
    function lookup(table, key, value) {
      var lo = 0;
      var hi = table.length - 1;
      var mid, i0, i1;
  
      while (lo >= 0 && lo <= hi) {
        mid = (lo + hi) >> 1;
        i0 = table[mid - 1] || null;
        i1 = table[mid];
  
        if (!i0) {
          // given value is outside table (before first item)
          return {lo: null, hi: i1};
        } else if (i1[key] < value) {
          lo = mid + 1;
        } else if (i0[key] > value) {
          hi = mid - 1;
        } else {
          return {lo: i0, hi: i1};
        }
      }
  
      // given value is outside table (after last item)
      return {lo: i1, hi: null};
    }
  
    /**
     * Linearly interpolates the given source `value` using the table items `skey` values and
     * returns the associated `tkey` value. For example, interpolate(table, 'time', 42, 'pos')
     * returns the position for a timestamp equal to 42. If value is out of bounds, values at
     * index [0, 1] or [n - 1, n] are used for the interpolation.
     */
    function interpolate$1(table, skey, sval, tkey) {
      var range = lookup(table, skey, sval);
  
      // Note: the lookup table ALWAYS contains at least 2 items (min and max)
      var prev = !range.lo ? table[0] : !range.hi ? table[table.length - 2] : range.lo;
      var next = !range.lo ? table[1] : !range.hi ? table[table.length - 1] : range.hi;
  
      var span = next[skey] - prev[skey];
      var ratio = span ? (sval - prev[skey]) / span : 0;
      var offset = (next[tkey] - prev[tkey]) * ratio;
  
      return prev[tkey] + offset;
    }
  
    function toTimestamp(scale, input) {
      var adapter = scale._adapter;
      var options = scale.options.time;
      var parser = options.parser;
      var format = parser || options.format;
      var value = input;
  
      if (typeof parser === 'function') {
        value = parser(value);
      }
  
      // Only parse if its not a timestamp already
      if (!helpers$1.isFinite(value)) {
        value = typeof format === 'string'
            ? adapter.parse(value, format)
            : adapter.parse(value);
      }
  
      if (value !== null) {
        return +value;
      }
  
      // Labels are in an incompatible format and no `parser` has been provided.
      // The user might still use the deprecated `format` option for parsing.
      if (!parser && typeof format === 'function') {
        value = format(input);
  
        // `format` could return something else than a timestamp, if so, parse it
        if (!helpers$1.isFinite(value)) {
          value = adapter.parse(value);
        }
      }
  
      return value;
    }
  
    function parse(scale, input) {
      if (helpers$1.isNullOrUndef(input)) {
        return null;
      }
  
      var options = scale.options.time;
      var value = toTimestamp(scale, scale.getRightValue(input));
      if (value === null) {
        return value;
      }
  
      if (options.round) {
        value = +scale._adapter.startOf(value, options.round);
      }
  
      return value;
    }
  
    /**
     * Returns the number of unit to skip to be able to display up to `capacity` number of ticks
     * in `unit` for the given `min` / `max` range and respecting the interval steps constraints.
     */
    function determineStepSize(min, max, unit, capacity) {
      var range = max - min;
      var interval = INTERVALS[unit];
      var milliseconds = interval.size;
      var steps = interval.steps;
      var i, ilen, factor;
  
      if (!steps) {
        return Math.ceil(range / (capacity * milliseconds));
      }
  
      for (i = 0, ilen = steps.length; i < ilen; ++i) {
        factor = steps[i];
        if (Math.ceil(range / (milliseconds * factor)) <= capacity) {
          break;
        }
      }
  
      return factor;
    }
  
    /**
     * Figures out what unit results in an appropriate number of auto-generated ticks
     */
    function determineUnitForAutoTicks(minUnit, min, max, capacity) {
      var ilen = UNITS.length;
      var i, interval, factor;
  
      for (i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
        interval = INTERVALS[UNITS[i]];
        factor = interval.steps ? interval.steps[interval.steps.length - 1] : MAX_INTEGER;
  
        if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
          return UNITS[i];
        }
      }
  
      return UNITS[ilen - 1];
    }
  
    /**
     * Figures out what unit to format a set of ticks with
     */
    function determineUnitForFormatting(scale, ticks, minUnit, min, max) {
      var ilen = UNITS.length;
      var i, unit;
  
      for (i = ilen - 1; i >= UNITS.indexOf(minUnit); i--) {
        unit = UNITS[i];
        if (INTERVALS[unit].common && scale._adapter.diff(max, min, unit) >= ticks.length) {
          return unit;
        }
      }
  
      return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
    }
  
    function determineMajorUnit(unit) {
      for (var i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
        if (INTERVALS[UNITS[i]].common) {
          return UNITS[i];
        }
      }
    }
  
    /**
     * Generates a maximum of `capacity` timestamps between min and max, rounded to the
     * `minor` unit, aligned on the `major` unit and using the given scale time `options`.
     * Important: this method can return ticks outside the min and max range, it's the
     * responsibility of the calling code to clamp values if needed.
     */
    function generate(scale, min, max, capacity) {
      var adapter = scale._adapter;
      var options = scale.options;
      var timeOpts = options.time;
      var minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, capacity);
      var major = determineMajorUnit(minor);
      var stepSize = valueOrDefault$c(timeOpts.stepSize, timeOpts.unitStepSize);
      var weekday = minor === 'week' ? timeOpts.isoWeekday : false;
      var majorTicksEnabled = options.ticks.major.enabled;
      var interval = INTERVALS[minor];
      var first = min;
      var last = max;
      var ticks = [];
      var time;
  
      if (!stepSize) {
        stepSize = determineStepSize(min, max, minor, capacity);
      }
  
      // For 'week' unit, handle the first day of week option
      if (weekday) {
        first = +adapter.startOf(first, 'isoWeek', weekday);
        last = +adapter.startOf(last, 'isoWeek', weekday);
      }
  
      // Align first/last ticks on unit
      first = +adapter.startOf(first, weekday ? 'day' : minor);
      last = +adapter.startOf(last, weekday ? 'day' : minor);
  
      // Make sure that the last tick include max
      if (last < max) {
        last = +adapter.add(last, 1, minor);
      }
  
      time = first;
  
      if (majorTicksEnabled && major && !weekday && !timeOpts.round) {
        // Align the first tick on the previous `minor` unit aligned on the `major` unit:
        // we first aligned time on the previous `major` unit then add the number of full
        // stepSize there is between first and the previous major time.
        time = +adapter.startOf(time, major);
        time = +adapter.add(time, ~~((first - time) / (interval.size * stepSize)) * stepSize, minor);
      }
  
      for (; time < last; time = +adapter.add(time, stepSize, minor)) {
        ticks.push(+time);
      }
  
      ticks.push(+time);
  
      return ticks;
    }
  
    /**
     * Returns the start and end offsets from edges in the form of {start, end}
     * where each value is a relative width to the scale and ranges between 0 and 1.
     * They add extra margins on the both sides by scaling down the original scale.
     * Offsets are added when the `offset` option is true.
     */
    function computeOffsets(table, ticks, min, max, options) {
      var start = 0;
      var end = 0;
      var first, last;
  
      if (options.offset && ticks.length) {
        if (!options.time.min) {
          first = interpolate$1(table, 'time', ticks[0], 'pos');
          if (ticks.length === 1) {
            start = 1 - first;
          } else {
            start = (interpolate$1(table, 'time', ticks[1], 'pos') - first) / 2;
          }
        }
        if (!options.time.max) {
          last = interpolate$1(table, 'time', ticks[ticks.length - 1], 'pos');
          if (ticks.length === 1) {
            end = last;
          } else {
            end = (last - interpolate$1(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
          }
        }
      }
  
      return {start: start, end: end};
    }
  
    function ticksFromTimestamps(scale, values, majorUnit) {
      var ticks = [];
      var i, ilen, value, major;
  
      for (i = 0, ilen = values.length; i < ilen; ++i) {
        value = values[i];
        major = majorUnit ? value === +scale._adapter.startOf(value, majorUnit) : false;
  
        ticks.push({
          value: value,
          major: major
        });
      }
  
      return ticks;
    }
  
    var defaultConfig$4 = {
      position: 'bottom',
  
      /**
       * Data distribution along the scale:
       * - 'linear': data are spread according to their time (distances can vary),
       * - 'series': data are spread at the same distance from each other.
       * @see https://github.com/chartjs/Chart.js/pull/4507
       * @since 2.7.0
       */
      distribution: 'linear',
  
      /**
       * Scale boundary strategy (bypassed by min/max time options)
       * - `data`: make sure data are fully visible, ticks outside are removed
       * - `ticks`: make sure ticks are fully visible, data outside are truncated
       * @see https://github.com/chartjs/Chart.js/pull/4556
       * @since 2.7.0
       */
      bounds: 'data',
  
      adapters: {},
      time: {
        parser: false, // false == a pattern string from https://momentjs.com/docs/#/parsing/string-format/ or a custom callback that converts its argument to a moment
        format: false, // DEPRECATED false == date objects, moment object, callback or a pattern string from https://momentjs.com/docs/#/parsing/string-format/
        unit: false, // false == automatic or override with week, month, year, etc.
        round: false, // none, or override with week, month, year, etc.
        displayFormat: false, // DEPRECATED
        isoWeekday: false, // override week start day - see https://momentjs.com/docs/#/get-set/iso-weekday/
        minUnit: 'millisecond',
        displayFormats: {}
      },
      ticks: {
        autoSkip: false,
  
        /**
         * Ticks generation input values:
         * - 'auto': generates "optimal" ticks based on scale size and time options.
         * - 'data': generates ticks from data (including labels from data {t|x|y} objects).
         * - 'labels': generates ticks from user given `data.labels` values ONLY.
         * @see https://github.com/chartjs/Chart.js/pull/4507
         * @since 2.7.0
         */
        source: 'auto',
  
        major: {
          enabled: false
        }
      }
    };
  
    var scale_time = core_scale.extend({
      initialize: function () {
        this.mergeTicksOptions();
        core_scale.prototype.initialize.call(this);
      },
  
      update: function () {
        var me = this;
        var options = me.options;
        var time = options.time || (options.time = {});
        var adapter = me._adapter = new core_adapters._date(options.adapters.date);
  
        // DEPRECATIONS: output a message only one time per update
        if (time.format) {
          console.warn('options.time.format is deprecated and replaced by options.time.parser.');
        }
  
        // Backward compatibility: before introducing adapter, `displayFormats` was
        // supposed to contain *all* unit/string pairs but this can't be resolved
        // when loading the scale (adapters are loaded afterward), so let's populate
        // missing formats on update
        helpers$1.mergeIf(time.displayFormats, adapter.formats());
  
        return core_scale.prototype.update.apply(me, arguments);
      },
  
      /**
       * Allows data to be referenced via 't' attribute
       */
      getRightValue: function (rawValue) {
        if (rawValue && rawValue.t !== undefined) {
          rawValue = rawValue.t;
        }
        return core_scale.prototype.getRightValue.call(this, rawValue);
      },
  
      determineDataLimits: function () {
        var me = this;
        var chart = me.chart;
        var adapter = me._adapter;
        var timeOpts = me.options.time;
        var unit = timeOpts.unit || 'day';
        var min = MAX_INTEGER;
        var max = MIN_INTEGER;
        var timestamps = [];
        var datasets = [];
        var labels = [];
        var i, j, ilen, jlen, data, timestamp;
        var dataLabels = chart.data.labels || [];
  
        // Convert labels to timestamps
        for (i = 0, ilen = dataLabels.length; i < ilen; ++i) {
          labels.push(parse(me, dataLabels[i]));
        }
  
        // Convert data to timestamps
        for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
          if (chart.isDatasetVisible(i)) {
            data = chart.data.datasets[i].data;
  
            // Let's consider that all data have the same format.
            if (helpers$1.isObject(data[0])) {
              datasets[i] = [];
  
              for (j = 0, jlen = data.length; j < jlen; ++j) {
                timestamp = parse(me, data[j]);
                timestamps.push(timestamp);
                datasets[i][j] = timestamp;
              }
            } else {
              for (j = 0, jlen = labels.length; j < jlen; ++j) {
                timestamps.push(labels[j]);
              }
              datasets[i] = labels.slice(0);
            }
          } else {
            datasets[i] = [];
          }
        }
  
        if (labels.length) {
          // Sort labels **after** data have been converted
          labels = arrayUnique(labels).sort(sorter);
          min = Math.min(min, labels[0]);
          max = Math.max(max, labels[labels.length - 1]);
        }
  
        if (timestamps.length) {
          timestamps = arrayUnique(timestamps).sort(sorter);
          min = Math.min(min, timestamps[0]);
          max = Math.max(max, timestamps[timestamps.length - 1]);
        }
  
        min = parse(me, timeOpts.min) || min;
        max = parse(me, timeOpts.max) || max;
  
        // In case there is no valid min/max, set limits based on unit time option
        min = min === MAX_INTEGER ? +adapter.startOf(Date.now(), unit) : min;
        max = max === MIN_INTEGER ? +adapter.endOf(Date.now(), unit) + 1 : max;
  
        // Make sure that max is strictly higher than min (required by the lookup table)
        me.min = Math.min(min, max);
        me.max = Math.max(min + 1, max);
  
        // PRIVATE
        me._horizontal = me.isHorizontal();
        me._table = [];
        me._timestamps = {
          data: timestamps,
          datasets: datasets,
          labels: labels
        };
      },
  
      buildTicks: function () {
        var me = this;
        var min = me.min;
        var max = me.max;
        var options = me.options;
        var timeOpts = options.time;
        var timestamps = [];
        var ticks = [];
        var i, ilen, timestamp;
  
        switch (options.ticks.source) {
          case 'data':
            timestamps = me._timestamps.data;
            break;
          case 'labels':
            timestamps = me._timestamps.labels;
            break;
          case 'auto':
          default:
            timestamps = generate(me, min, max, me.getLabelCapacity(min), options);
        }
  
        if (options.bounds === 'ticks' && timestamps.length) {
          min = timestamps[0];
          max = timestamps[timestamps.length - 1];
        }
  
        // Enforce limits with user min/max options
        min = parse(me, timeOpts.min) || min;
        max = parse(me, timeOpts.max) || max;
  
        // Remove ticks outside the min/max range
        for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
          timestamp = timestamps[i];
          if (timestamp >= min && timestamp <= max) {
            ticks.push(timestamp);
          }
        }
  
        me.min = min;
        me.max = max;
  
        // PRIVATE
        me._unit = timeOpts.unit || determineUnitForFormatting(me, ticks, timeOpts.minUnit, me.min, me.max);
        me._majorUnit = determineMajorUnit(me._unit);
        me._table = buildLookupTable(me._timestamps.data, min, max, options.distribution);
        me._offsets = computeOffsets(me._table, ticks, min, max, options);
  
        if (options.ticks.reverse) {
          ticks.reverse();
        }
  
        return ticksFromTimestamps(me, ticks, me._majorUnit);
      },
  
      getLabelForIndex: function (index, datasetIndex) {
        var me = this;
        var adapter = me._adapter;
        var data = me.chart.data;
        var timeOpts = me.options.time;
        var label = data.labels && index < data.labels.length ? data.labels[index] : '';
        var value = data.datasets[datasetIndex].data[index];
  
        if (helpers$1.isObject(value)) {
          label = me.getRightValue(value);
        }
        if (timeOpts.tooltipFormat) {
          return adapter.format(toTimestamp(me, label), timeOpts.tooltipFormat);
        }
        if (typeof label === 'string') {
          return label;
        }
        return adapter.format(toTimestamp(me, label), timeOpts.displayFormats.datetime);
      },
  
      /**
       * Function to format an individual tick mark
       * @private
       */
      tickFormatFunction: function (time, index, ticks, format) {
        var me = this;
        var adapter = me._adapter;
        var options = me.options;
        var formats = options.time.displayFormats;
        var minorFormat = formats[me._unit];
        var majorUnit = me._majorUnit;
        var majorFormat = formats[majorUnit];
        var majorTime = +adapter.startOf(time, majorUnit);
        var majorTickOpts = options.ticks.major;
        var major = majorTickOpts.enabled && majorUnit && majorFormat && time === majorTime;
        var label = adapter.format(time, format ? format : major ? majorFormat : minorFormat);
        var tickOpts = major ? majorTickOpts : options.ticks.minor;
        var formatter = valueOrDefault$c(tickOpts.callback, tickOpts.userCallback);
  
        return formatter ? formatter(label, index, ticks) : label;
      },
  
      convertTicksToLabels: function (ticks) {
        var labels = [];
        var i, ilen;
  
        for (i = 0, ilen = ticks.length; i < ilen; ++i) {
          labels.push(this.tickFormatFunction(ticks[i].value, i, ticks));
        }
  
        return labels;
      },
  
      /**
       * @private
       */
      getPixelForOffset: function (time) {
        var me = this;
        var isReverse = me.options.ticks.reverse;
        var size = me._horizontal ? me.width : me.height;
        var start = me._horizontal ? isReverse ? me.right : me.left : isReverse ? me.bottom : me.top;
        var pos = interpolate$1(me._table, 'time', time, 'pos');
        var offset = size * (me._offsets.start + pos) / (me._offsets.start + 1 + me._offsets.end);
  
        return isReverse ? start - offset : start + offset;
      },
  
      getPixelForValue: function (value, index, datasetIndex) {
        var me = this;
        var time = null;
  
        if (index !== undefined && datasetIndex !== undefined) {
          time = me._timestamps.datasets[datasetIndex][index];
        }
  
        if (time === null) {
          time = parse(me, value);
        }
  
        if (time !== null) {
          return me.getPixelForOffset(time);
        }
      },
  
      getPixelForTick: function (index) {
        var ticks = this.getTicks();
        return index >= 0 && index < ticks.length ?
            this.getPixelForOffset(ticks[index].value) :
            null;
      },
  
      getValueForPixel: function (pixel) {
        var me = this;
        var size = me._horizontal ? me.width : me.height;
        var start = me._horizontal ? me.left : me.top;
        var pos = (size ? (pixel - start) / size : 0) * (me._offsets.start + 1 + me._offsets.start) - me._offsets.end;
        var time = interpolate$1(me._table, 'pos', pos, 'time');
  
        // DEPRECATION, we should return time directly
        return me._adapter._create(time);
      },
  
      /**
       * Crude approximation of what the label width might be
       * @private
       */
      getLabelWidth: function (label) {
        var me = this;
        var ticksOpts = me.options.ticks;
        var tickLabelWidth = me.ctx.measureText(label).width;
        var angle = helpers$1.toRadians(ticksOpts.maxRotation);
        var cosRotation = Math.cos(angle);
        var sinRotation = Math.sin(angle);
        var tickFontSize = valueOrDefault$c(ticksOpts.fontSize, core_defaults.global.defaultFontSize);
  
        return (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation);
      },
  
      /**
       * @private
       */
      getLabelCapacity: function (exampleTime) {
        var me = this;
  
        // pick the longest format (milliseconds) for guestimation
        var format = me.options.time.displayFormats.millisecond;
        var exampleLabel = me.tickFormatFunction(exampleTime, 0, [], format);
        var tickLabelWidth = me.getLabelWidth(exampleLabel);
        var innerWidth = me.isHorizontal() ? me.width : me.height;
        var capacity = Math.floor(innerWidth / tickLabelWidth);
  
        return capacity > 0 ? capacity : 1;
      }
    });
  
  // INTERNAL: static default options, registered in src/index.js
    var _defaults$4 = defaultConfig$4;
    scale_time._defaults = _defaults$4;
  
    var scales = {
      category: scale_category,
      linear: scale_linear,
      logarithmic: scale_logarithmic,
      radialLinear: scale_radialLinear,
      time: scale_time
    };
  
    var FORMATS = {
      datetime: 'MMM D, YYYY, h:mm:ss a',
      millisecond: 'h:mm:ss.SSS a',
      second: 'h:mm:ss a',
      minute: 'h:mm a',
      hour: 'hA',
      day: 'MMM D',
      week: 'll',
      month: 'MMM YYYY',
      quarter: '[Q]Q - YYYY',
      year: 'YYYY'
    };
  
    core_adapters._date.override(typeof moment === 'function' ? {
      _id: 'moment', // DEBUG ONLY
  
      formats: function () {
        return FORMATS;
      },
  
      parse: function (value, format) {
        if (typeof value === 'string' && typeof format === 'string') {
          value = moment(value, format);
        } else if (!(value instanceof moment)) {
          value = moment(value);
        }
        return value.isValid() ? value.valueOf() : null;
      },
  
      format: function (time, format) {
        return moment(time).format(format);
      },
  
      add: function (time, amount, unit) {
        return moment(time).add(amount, unit).valueOf();
      },
  
      diff: function (max, min, unit) {
        return moment.duration(moment(max).diff(moment(min))).as(unit);
      },
  
      startOf: function (time, unit, weekday) {
        time = moment(time);
        if (unit === 'isoWeek') {
          return time.isoWeekday(weekday).valueOf();
        }
        return time.startOf(unit).valueOf();
      },
  
      endOf: function (time, unit) {
        return moment(time).endOf(unit).valueOf();
      },
  
      // DEPRECATIONS
  
      /**
       * Provided for backward compatibility with scale.getValueForPixel().
       * @deprecated since version 2.8.0
       * @todo remove at version 3
       * @private
       */
      _create: function (time) {
        return moment(time);
      },
    } : {});
  
    core_defaults._set('global', {
      plugins: {
        filler: {
          propagate: true
        }
      }
    });
  
    var mappers = {
      dataset: function (source) {
        var index = source.fill;
        var chart = source.chart;
        var meta = chart.getDatasetMeta(index);
        var visible = meta && chart.isDatasetVisible(index);
        var points = (visible && meta.dataset._children) || [];
        var length = points.length || 0;
  
        return !length ? null : function (point, i) {
          return (i < length && points[i]._view) || null;
        };
      },
  
      boundary: function (source) {
        var boundary = source.boundary;
        var x = boundary ? boundary.x : null;
        var y = boundary ? boundary.y : null;
  
        return function (point) {
          return {
            x: x === null ? point.x : x,
            y: y === null ? point.y : y,
          };
        };
      }
    };
  
  // @todo if (fill[0] === '#')
    function decodeFill(el, index, count) {
      var model = el._model || {};
      var fill = model.fill;
      var target;
  
      if (fill === undefined) {
        fill = !!model.backgroundColor;
      }
  
      if (fill === false || fill === null) {
        return false;
      }
  
      if (fill === true) {
        return 'origin';
      }
  
      target = parseFloat(fill, 10);
      if (isFinite(target) && Math.floor(target) === target) {
        if (fill[0] === '-' || fill[0] === '+') {
          target = index + target;
        }
  
        if (target === index || target < 0 || target >= count) {
          return false;
        }
  
        return target;
      }
  
      switch (fill) {
          // compatibility
        case 'bottom':
          return 'start';
        case 'top':
          return 'end';
        case 'zero':
          return 'origin';
          // supported boundaries
        case 'origin':
        case 'start':
        case 'end':
          return fill;
          // invalid fill values
        default:
          return false;
      }
    }
  
    function computeBoundary(source) {
      var model = source.el._model || {};
      var scale = source.el._scale || {};
      var fill = source.fill;
      var target = null;
      var horizontal;
  
      if (isFinite(fill)) {
        return null;
      }
  
      // Backward compatibility: until v3, we still need to support boundary values set on
      // the model (scaleTop, scaleBottom and scaleZero) because some external plugins and
      // controllers might still use it (e.g. the Smith chart).
  
      if (fill === 'start') {
        target = model.scaleBottom === undefined ? scale.bottom : model.scaleBottom;
      } else if (fill === 'end') {
        target = model.scaleTop === undefined ? scale.top : model.scaleTop;
      } else if (model.scaleZero !== undefined) {
        target = model.scaleZero;
      } else if (scale.getBasePosition) {
        target = scale.getBasePosition();
      } else if (scale.getBasePixel) {
        target = scale.getBasePixel();
      }
  
      if (target !== undefined && target !== null) {
        if (target.x !== undefined && target.y !== undefined) {
          return target;
        }
  
        if (helpers$1.isFinite(target)) {
          horizontal = scale.isHorizontal();
          return {
            x: horizontal ? target : null,
            y: horizontal ? null : target
          };
        }
      }
  
      return null;
    }
  
    function resolveTarget(sources, index, propagate) {
      var source = sources[index];
      var fill = source.fill;
      var visited = [index];
      var target;
  
      if (!propagate) {
        return fill;
      }
  
      while (fill !== false && visited.indexOf(fill) === -1) {
        if (!isFinite(fill)) {
          return fill;
        }
  
        target = sources[fill];
        if (!target) {
          return false;
        }
  
        if (target.visible) {
          return fill;
        }
  
        visited.push(fill);
        fill = target.fill;
      }
  
      return false;
    }
  
    function createMapper(source) {
      var fill = source.fill;
      var type = 'dataset';
  
      if (fill === false) {
        return null;
      }
  
      if (!isFinite(fill)) {
        type = 'boundary';
      }
  
      return mappers[type](source);
    }
  
    function isDrawable(point) {
      return point && !point.skip;
    }
  
    function drawArea(ctx, curve0, curve1, len0, len1) {
      var i;
  
      if (!len0 || !len1) {
        return;
      }
  
      // building first area curve (normal)
      ctx.moveTo(curve0[0].x, curve0[0].y);
      for (i = 1; i < len0; ++i) {
        helpers$1.canvas.lineTo(ctx, curve0[i - 1], curve0[i]);
      }
  
      // joining the two area curves
      ctx.lineTo(curve1[len1 - 1].x, curve1[len1 - 1].y);
  
      // building opposite area curve (reverse)
      for (i = len1 - 1; i > 0; --i) {
        helpers$1.canvas.lineTo(ctx, curve1[i], curve1[i - 1], true);
      }
    }
  
    function doFill(ctx, points, mapper, view, color, loop) {
      var count = points.length;
      var span = view.spanGaps;
      var curve0 = [];
      var curve1 = [];
      var len0 = 0;
      var len1 = 0;
      var i, ilen, index, p0, p1, d0, d1;
  
      ctx.beginPath();
  
      for (i = 0, ilen = (count + !!loop); i < ilen; ++i) {
        index = i % count;
        p0 = points[index]._view;
        p1 = mapper(p0, index, view);
        d0 = isDrawable(p0);
        d1 = isDrawable(p1);
  
        if (d0 && d1) {
          len0 = curve0.push(p0);
          len1 = curve1.push(p1);
        } else if (len0 && len1) {
          if (!span) {
            drawArea(ctx, curve0, curve1, len0, len1);
            len0 = len1 = 0;
            curve0 = [];
            curve1 = [];
          } else {
            if (d0) {
              curve0.push(p0);
            }
            if (d1) {
              curve1.push(p1);
            }
          }
        }
      }
  
      drawArea(ctx, curve0, curve1, len0, len1);
  
      ctx.closePath();
      ctx.fillStyle = color;
      ctx.fill();
    }
  
    var plugin_filler = {
      id: 'filler',
  
      afterDatasetsUpdate: function (chart, options) {
        var count = (chart.data.datasets || []).length;
        var propagate = options.propagate;
        var sources = [];
        var meta, i, el, source;
  
        for (i = 0; i < count; ++i) {
          meta = chart.getDatasetMeta(i);
          el = meta.dataset;
          source = null;
  
          if (el && el._model && el instanceof elements.Line) {
            source = {
              visible: chart.isDatasetVisible(i),
              fill: decodeFill(el, i, count),
              chart: chart,
              el: el
            };
          }
  
          meta.$filler = source;
          sources.push(source);
        }
  
        for (i = 0; i < count; ++i) {
          source = sources[i];
          if (!source) {
            continue;
          }
  
          source.fill = resolveTarget(sources, i, propagate);
          source.boundary = computeBoundary(source);
          source.mapper = createMapper(source);
        }
      },
  
      beforeDatasetDraw: function (chart, args) {
        var meta = args.meta.$filler;
        if (!meta) {
          return;
        }
  
        var ctx = chart.ctx;
        var el = meta.el;
        var view = el._view;
        var points = el._children || [];
        var mapper = meta.mapper;
        var color = view.backgroundColor || core_defaults.global.defaultColor;
  
        if (mapper && color && points.length) {
          helpers$1.canvas.clipArea(ctx, chart.chartArea);
          doFill(ctx, points, mapper, view, color, el._loop);
          helpers$1.canvas.unclipArea(ctx);
        }
      }
    };
  
    var noop$1 = helpers$1.noop;
    var valueOrDefault$d = helpers$1.valueOrDefault;
  
    core_defaults._set('global', {
      legend: {
        display: true,
        position: 'top',
        fullWidth: true,
        reverse: false,
        weight: 1000,
  
        // a callback that will handle
        onClick: function (e, legendItem) {
          var index = legendItem.datasetIndex;
          var ci = this.chart;
          var meta = ci.getDatasetMeta(index);
  
          // See controller.isDatasetVisible comment
          meta.hidden = meta.hidden === null ? !ci.data.datasets[index].hidden : null;
  
          // We hid a dataset ... rerender the chart
          ci.update();
        },
  
        onHover: null,
        onLeave: null,
  
        labels: {
          boxWidth: 40,
          padding: 10,
          // Generates labels shown in the legend
          // Valid properties to return:
          // text : text to display
          // fillStyle : fill of coloured box
          // strokeStyle: stroke of coloured box
          // hidden : if this legend item refers to a hidden item
          // lineCap : cap style for line
          // lineDash
          // lineDashOffset :
          // lineJoin :
          // lineWidth :
          generateLabels: function (chart) {
            var data = chart.data;
            return helpers$1.isArray(data.datasets) ? data.datasets.map(function (dataset, i) {
              return {
                text: dataset.label,
                fillStyle: (!helpers$1.isArray(dataset.backgroundColor) ? dataset.backgroundColor : dataset.backgroundColor[0]),
                hidden: !chart.isDatasetVisible(i),
                lineCap: dataset.borderCapStyle,
                lineDash: dataset.borderDash,
                lineDashOffset: dataset.borderDashOffset,
                lineJoin: dataset.borderJoinStyle,
                lineWidth: dataset.borderWidth,
                strokeStyle: dataset.borderColor,
                pointStyle: dataset.pointStyle,
  
                // Below is extra data used for toggling the datasets
                datasetIndex: i
              };
            }, this) : [];
          }
        }
      },
  
      legendCallback: function (chart) {
        var text = [];
        text.push('<ul class="' + chart.id + '-legend">');
        for (var i = 0; i < chart.data.datasets.length; i++) {
          text.push('<li><span style="background-color:' + chart.data.datasets[i].backgroundColor + '"></span>');
          if (chart.data.datasets[i].label) {
            text.push(chart.data.datasets[i].label);
          }
          text.push('</li>');
        }
        text.push('</ul>');
        return text.join('');
      }
    });
  
    /**
     * Helper function to get the box width based on the usePointStyle option
     * @param {object} labelopts - the label options on the legend
     * @param {number} fontSize - the label font size
     * @return {number} width of the color box area
     */
    function getBoxWidth(labelOpts, fontSize) {
      return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize ?
          fontSize :
          labelOpts.boxWidth;
    }
  
    /**
     * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
     */
    var Legend = core_element.extend({
  
      initialize: function (config) {
        helpers$1.extend(this, config);
  
        // Contains hit boxes for each dataset (in dataset order)
        this.legendHitBoxes = [];
  
        /**
         * @private
         */
        this._hoveredItem = null;
  
        // Are we in doughnut mode which has a different data type
        this.doughnutMode = false;
      },
  
      // These methods are ordered by lifecycle. Utilities then follow.
      // Any function defined here is inherited by all legend types.
      // Any function can be extended by the legend type
  
      beforeUpdate: noop$1,
      update: function (maxWidth, maxHeight, margins) {
        var me = this;
  
        // Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
        me.beforeUpdate();
  
        // Absorb the master measurements
        me.maxWidth = maxWidth;
        me.maxHeight = maxHeight;
        me.margins = margins;
  
        // Dimensions
        me.beforeSetDimensions();
        me.setDimensions();
        me.afterSetDimensions();
        // Labels
        me.beforeBuildLabels();
        me.buildLabels();
        me.afterBuildLabels();
  
        // Fit
        me.beforeFit();
        me.fit();
        me.afterFit();
        //
        me.afterUpdate();
  
        return me.minSize;
      },
      afterUpdate: noop$1,
  
      //
  
      beforeSetDimensions: noop$1,
      setDimensions: function () {
        var me = this;
        // Set the unconstrained dimension before label rotation
        if (me.isHorizontal()) {
          // Reset position before calculating rotation
          me.width = me.maxWidth;
          me.left = 0;
          me.right = me.width;
        } else {
          me.height = me.maxHeight;
  
          // Reset position before calculating rotation
          me.top = 0;
          me.bottom = me.height;
        }
  
        // Reset padding
        me.paddingLeft = 0;
        me.paddingTop = 0;
        me.paddingRight = 0;
        me.paddingBottom = 0;
  
        // Reset minSize
        me.minSize = {
          width: 0,
          height: 0
        };
      },
      afterSetDimensions: noop$1,
  
      //
  
      beforeBuildLabels: noop$1,
      buildLabels: function () {
        var me = this;
        var labelOpts = me.options.labels || {};
        var legendItems = helpers$1.callback(labelOpts.generateLabels, [me.chart], me) || [];
  
        if (labelOpts.filter) {
          legendItems = legendItems.filter(function (item) {
            return labelOpts.filter(item, me.chart.data);
          });
        }
  
        if (me.options.reverse) {
          legendItems.reverse();
        }
  
        me.legendItems = legendItems;
      },
      afterBuildLabels: noop$1,
  
      //
  
      beforeFit: noop$1,
      fit: function () {
        var me = this;
        var opts = me.options;
        var labelOpts = opts.labels;
        var display = opts.display;
  
        var ctx = me.ctx;
  
        var labelFont = helpers$1.options._parseFont(labelOpts);
        var fontSize = labelFont.size;
  
        // Reset hit boxes
        var hitboxes = me.legendHitBoxes = [];
  
        var minSize = me.minSize;
        var isHorizontal = me.isHorizontal();
  
        if (isHorizontal) {
          minSize.width = me.maxWidth; // fill all the width
          minSize.height = display ? 10 : 0;
        } else {
          minSize.width = display ? 10 : 0;
          minSize.height = me.maxHeight; // fill all the height
        }
  
        // Increase sizes here
        if (display) {
          ctx.font = labelFont.string;
  
          if (isHorizontal) {
            // Labels
  
            // Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
            var lineWidths = me.lineWidths = [0];
            var totalHeight = 0;
  
            ctx.textAlign = 'left';
            ctx.textBaseline = 'top';
  
            helpers$1.each(me.legendItems, function (legendItem, i) {
              var boxWidth = getBoxWidth(labelOpts, fontSize);
              var width = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
  
              if (i === 0 || lineWidths[lineWidths.length - 1] + width + labelOpts.padding > minSize.width) {
                totalHeight += fontSize + labelOpts.padding;
                lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = labelOpts.padding;
              }
  
              // Store the hitbox width and height here. Final position will be updated in `draw`
              hitboxes[i] = {
                left: 0,
                top: 0,
                width: width,
                height: fontSize
              };
  
              lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
            });
  
            minSize.height += totalHeight;
  
          } else {
            var vPadding = labelOpts.padding;
            var columnWidths = me.columnWidths = [];
            var totalWidth = labelOpts.padding;
            var currentColWidth = 0;
            var currentColHeight = 0;
            var itemHeight = fontSize + vPadding;
  
            helpers$1.each(me.legendItems, function (legendItem, i) {
              var boxWidth = getBoxWidth(labelOpts, fontSize);
              var itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
  
              // If too tall, go to new column
              if (i > 0 && currentColHeight + itemHeight > minSize.height - vPadding) {
                totalWidth += currentColWidth + labelOpts.padding;
                columnWidths.push(currentColWidth); // previous column width
  
                currentColWidth = 0;
                currentColHeight = 0;
              }
  
              // Get max width
              currentColWidth = Math.max(currentColWidth, itemWidth);
              currentColHeight += itemHeight;
  
              // Store the hitbox width and height here. Final position will be updated in `draw`
              hitboxes[i] = {
                left: 0,
                top: 0,
                width: itemWidth,
                height: fontSize
              };
            });
  
            totalWidth += currentColWidth;
            columnWidths.push(currentColWidth);
            minSize.width += totalWidth;
          }
        }
  
        me.width = minSize.width;
        me.height = minSize.height;
      },
      afterFit: noop$1,
  
      // Shared Methods
      isHorizontal: function () {
        return this.options.position === 'top' || this.options.position === 'bottom';
      },
  
      // Actually draw the legend on the canvas
      draw: function () {
        var me = this;
        var opts = me.options;
        var labelOpts = opts.labels;
        var globalDefaults = core_defaults.global;
        var defaultColor = globalDefaults.defaultColor;
        var lineDefault = globalDefaults.elements.line;
        var legendWidth = me.width;
        var lineWidths = me.lineWidths;
  
        if (opts.display) {
          var ctx = me.ctx;
          var fontColor = valueOrDefault$d(labelOpts.fontColor, globalDefaults.defaultFontColor);
          var labelFont = helpers$1.options._parseFont(labelOpts);
          var fontSize = labelFont.size;
          var cursor;
  
          // Canvas setup
          ctx.textAlign = 'left';
          ctx.textBaseline = 'middle';
          ctx.lineWidth = 0.5;
          ctx.strokeStyle = fontColor; // for strikethrough effect
          ctx.fillStyle = fontColor; // render in correct colour
          ctx.font = labelFont.string;
  
          var boxWidth = getBoxWidth(labelOpts, fontSize);
          var hitboxes = me.legendHitBoxes;
  
          // current position
          var drawLegendBox = function (x, y, legendItem) {
            if (isNaN(boxWidth) || boxWidth <= 0) {
              return;
            }
  
            // Set the ctx for the box
            ctx.save();
  
            var lineWidth = valueOrDefault$d(legendItem.lineWidth, lineDefault.borderWidth);
            ctx.fillStyle = valueOrDefault$d(legendItem.fillStyle, defaultColor);
            ctx.lineCap = valueOrDefault$d(legendItem.lineCap, lineDefault.borderCapStyle);
            ctx.lineDashOffset = valueOrDefault$d(legendItem.lineDashOffset, lineDefault.borderDashOffset);
            ctx.lineJoin = valueOrDefault$d(legendItem.lineJoin, lineDefault.borderJoinStyle);
            ctx.lineWidth = lineWidth;
            ctx.strokeStyle = valueOrDefault$d(legendItem.strokeStyle, defaultColor);
  
            if (ctx.setLineDash) {
              // IE 9 and 10 do not support line dash
              ctx.setLineDash(valueOrDefault$d(legendItem.lineDash, lineDefault.borderDash));
            }
  
            if (opts.labels && opts.labels.usePointStyle) {
              // Recalculate x and y for drawPoint() because its expecting
              // x and y to be center of figure (instead of top left)
              var radius = boxWidth * Math.SQRT2 / 2;
              var centerX = x + boxWidth / 2;
              var centerY = y + fontSize / 2;
  
              // Draw pointStyle as legend symbol
              helpers$1.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY);
            } else {
              // Draw box as legend symbol
              if (lineWidth !== 0) {
                ctx.strokeRect(x, y, boxWidth, fontSize);
              }
              ctx.fillRect(x, y, boxWidth, fontSize);
            }
  
            ctx.restore();
          };
          var fillText = function (x, y, legendItem, textWidth) {
            var halfFontSize = fontSize / 2;
            var xLeft = boxWidth + halfFontSize + x;
            var yMiddle = y + halfFontSize;
  
            ctx.fillText(legendItem.text, xLeft, yMiddle);
  
            if (legendItem.hidden) {
              // Strikethrough the text if hidden
              ctx.beginPath();
              ctx.lineWidth = 2;
              ctx.moveTo(xLeft, yMiddle);
              ctx.lineTo(xLeft + textWidth, yMiddle);
              ctx.stroke();
            }
          };
  
          // Horizontal
          var isHorizontal = me.isHorizontal();
          if (isHorizontal) {
            cursor = {
              x: me.left + ((legendWidth - lineWidths[0]) / 2) + labelOpts.padding,
              y: me.top + labelOpts.padding,
              line: 0
            };
          } else {
            cursor = {
              x: me.left + labelOpts.padding,
              y: me.top + labelOpts.padding,
              line: 0
            };
          }
  
          var itemHeight = fontSize + labelOpts.padding;
          helpers$1.each(me.legendItems, function (legendItem, i) {
            var textWidth = ctx.measureText(legendItem.text).width;
            var width = boxWidth + (fontSize / 2) + textWidth;
            var x = cursor.x;
            var y = cursor.y;
  
            // Use (me.left + me.minSize.width) and (me.top + me.minSize.height)
            // instead of me.right and me.bottom because me.width and me.height
            // may have been changed since me.minSize was calculated
            if (isHorizontal) {
              if (i > 0 && x + width + labelOpts.padding > me.left + me.minSize.width) {
                y = cursor.y += itemHeight;
                cursor.line++;
                x = cursor.x = me.left + ((legendWidth - lineWidths[cursor.line]) / 2) + labelOpts.padding;
              }
            } else if (i > 0 && y + itemHeight > me.top + me.minSize.height) {
              x = cursor.x = x + me.columnWidths[cursor.line] + labelOpts.padding;
              y = cursor.y = me.top + labelOpts.padding;
              cursor.line++;
            }
  
            drawLegendBox(x, y, legendItem);
  
            hitboxes[i].left = x;
            hitboxes[i].top = y;
  
            // Fill the actual label
            fillText(x, y, legendItem, textWidth);
  
            if (isHorizontal) {
              cursor.x += width + labelOpts.padding;
            } else {
              cursor.y += itemHeight;
            }
  
          });
        }
      },
  
      /**
       * @private
       */
      _getLegendItemAt: function (x, y) {
        var me = this;
        var i, hitBox, lh;
  
        if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
          // See if we are touching one of the dataset boxes
          lh = me.legendHitBoxes;
          for (i = 0; i < lh.length; ++i) {
            hitBox = lh[i];
  
            if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
              // Touching an element
              return me.legendItems[i];
            }
          }
        }
  
        return null;
      },
  
      /**
       * Handle an event
       * @private
       * @param {IEvent} event - The event to handle
       */
      handleEvent: function (e) {
        var me = this;
        var opts = me.options;
        var type = e.type === 'mouseup' ? 'click' : e.type;
        var hoveredItem;
  
        if (type === 'mousemove') {
          if (!opts.onHover && !opts.onLeave) {
            return;
          }
        } else if (type === 'click') {
          if (!opts.onClick) {
            return;
          }
        } else {
          return;
        }
  
        // Chart event already has relative position in it
        hoveredItem = me._getLegendItemAt(e.x, e.y);
  
        if (type === 'click') {
          if (hoveredItem && opts.onClick) {
            // use e.native for backwards compatibility
            opts.onClick.call(me, e.native, hoveredItem);
          }
        } else {
          if (opts.onLeave && hoveredItem !== me._hoveredItem) {
            if (me._hoveredItem) {
              opts.onLeave.call(me, e.native, me._hoveredItem);
            }
            me._hoveredItem = hoveredItem;
          }
  
          if (opts.onHover && hoveredItem) {
            // use e.native for backwards compatibility
            opts.onHover.call(me, e.native, hoveredItem);
          }
        }
      }
    });
  
    function createNewLegendAndAttach(chart, legendOpts) {
      var legend = new Legend({
        ctx: chart.ctx,
        options: legendOpts,
        chart: chart
      });
  
      core_layouts.configure(chart, legend, legendOpts);
      core_layouts.addBox(chart, legend);
      chart.legend = legend;
    }
  
    var plugin_legend = {
      id: 'legend',
  
      /**
       * Backward compatibility: since 2.1.5, the legend is registered as a plugin, making
       * Chart.Legend obsolete. To avoid a breaking change, we export the Legend as part of
       * the plugin, which one will be re-exposed in the chart.js file.
       * https://github.com/chartjs/Chart.js/pull/2640
       * @private
       */
      _element: Legend,
  
      beforeInit: function (chart) {
        var legendOpts = chart.options.legend;
  
        if (legendOpts) {
          createNewLegendAndAttach(chart, legendOpts);
        }
      },
  
      beforeUpdate: function (chart) {
        var legendOpts = chart.options.legend;
        var legend = chart.legend;
  
        if (legendOpts) {
          helpers$1.mergeIf(legendOpts, core_defaults.global.legend);
  
          if (legend) {
            core_layouts.configure(chart, legend, legendOpts);
            legend.options = legendOpts;
          } else {
            createNewLegendAndAttach(chart, legendOpts);
          }
        } else if (legend) {
          core_layouts.removeBox(chart, legend);
          delete chart.legend;
        }
      },
  
      afterEvent: function (chart, e) {
        var legend = chart.legend;
        if (legend) {
          legend.handleEvent(e);
        }
      }
    };
  
    var noop$2 = helpers$1.noop;
  
    core_defaults._set('global', {
      title: {
        display: false,
        fontStyle: 'bold',
        fullWidth: true,
        padding: 10,
        position: 'top',
        text: '',
        weight: 2000         // by default greater than legend (1000) to be above
      }
    });
  
    /**
     * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
     */
    var Title = core_element.extend({
      initialize: function (config) {
        var me = this;
        helpers$1.extend(me, config);
  
        // Contains hit boxes for each dataset (in dataset order)
        me.legendHitBoxes = [];
      },
  
      // These methods are ordered by lifecycle. Utilities then follow.
  
      beforeUpdate: noop$2,
      update: function (maxWidth, maxHeight, margins) {
        var me = this;
  
        // Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
        me.beforeUpdate();
  
        // Absorb the master measurements
        me.maxWidth = maxWidth;
        me.maxHeight = maxHeight;
        me.margins = margins;
  
        // Dimensions
        me.beforeSetDimensions();
        me.setDimensions();
        me.afterSetDimensions();
        // Labels
        me.beforeBuildLabels();
        me.buildLabels();
        me.afterBuildLabels();
  
        // Fit
        me.beforeFit();
        me.fit();
        me.afterFit();
        //
        me.afterUpdate();
  
        return me.minSize;
  
      },
      afterUpdate: noop$2,
  
      //
  
      beforeSetDimensions: noop$2,
      setDimensions: function () {
        var me = this;
        // Set the unconstrained dimension before label rotation
        if (me.isHorizontal()) {
          // Reset position before calculating rotation
          me.width = me.maxWidth;
          me.left = 0;
          me.right = me.width;
        } else {
          me.height = me.maxHeight;
  
          // Reset position before calculating rotation
          me.top = 0;
          me.bottom = me.height;
        }
  
        // Reset padding
        me.paddingLeft = 0;
        me.paddingTop = 0;
        me.paddingRight = 0;
        me.paddingBottom = 0;
  
        // Reset minSize
        me.minSize = {
          width: 0,
          height: 0
        };
      },
      afterSetDimensions: noop$2,
  
      //
  
      beforeBuildLabels: noop$2,
      buildLabels: noop$2,
      afterBuildLabels: noop$2,
  
      //
  
      beforeFit: noop$2,
      fit: function () {
        var me = this;
        var opts = me.options;
        var display = opts.display;
        var minSize = me.minSize;
        var lineCount = helpers$1.isArray(opts.text) ? opts.text.length : 1;
        var fontOpts = helpers$1.options._parseFont(opts);
        var textSize = display ? (lineCount * fontOpts.lineHeight) + (opts.padding * 2) : 0;
  
        if (me.isHorizontal()) {
          minSize.width = me.maxWidth; // fill all the width
          minSize.height = textSize;
        } else {
          minSize.width = textSize;
          minSize.height = me.maxHeight; // fill all the height
        }
  
        me.width = minSize.width;
        me.height = minSize.height;
  
      },
      afterFit: noop$2,
  
      // Shared Methods
      isHorizontal: function () {
        var pos = this.options.position;
        return pos === 'top' || pos === 'bottom';
      },
  
      // Actually draw the title block on the canvas
      draw: function () {
        var me = this;
        var ctx = me.ctx;
        var opts = me.options;
  
        if (opts.display) {
          var fontOpts = helpers$1.options._parseFont(opts);
          var lineHeight = fontOpts.lineHeight;
          var offset = lineHeight / 2 + opts.padding;
          var rotation = 0;
          var top = me.top;
          var left = me.left;
          var bottom = me.bottom;
          var right = me.right;
          var maxWidth, titleX, titleY;
  
          ctx.fillStyle = helpers$1.valueOrDefault(opts.fontColor, core_defaults.global.defaultFontColor); // render in correct colour
          ctx.font = fontOpts.string;
  
          // Horizontal
          if (me.isHorizontal()) {
            titleX = left + ((right - left) / 2); // midpoint of the width
            titleY = top + offset;
            maxWidth = right - left;
          } else {
            titleX = opts.position === 'left' ? left + offset : right - offset;
            titleY = top + ((bottom - top) / 2);
            maxWidth = bottom - top;
            rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
          }
  
          ctx.save();
          ctx.translate(titleX, titleY);
          ctx.rotate(rotation);
          ctx.textAlign = 'center';
          ctx.textBaseline = 'middle';
  
          var text = opts.text;
          if (helpers$1.isArray(text)) {
            var y = 0;
            for (var i = 0; i < text.length; ++i) {
              ctx.fillText(text[i], 0, y, maxWidth);
              y += lineHeight;
            }
          } else {
            ctx.fillText(text, 0, 0, maxWidth);
          }
  
          ctx.restore();
        }
      }
    });
  
    function createNewTitleBlockAndAttach(chart, titleOpts) {
      var title = new Title({
        ctx: chart.ctx,
        options: titleOpts,
        chart: chart
      });
  
      core_layouts.configure(chart, title, titleOpts);
      core_layouts.addBox(chart, title);
      chart.titleBlock = title;
    }
  
    var plugin_title = {
      id: 'title',
  
      /**
       * Backward compatibility: since 2.1.5, the title is registered as a plugin, making
       * Chart.Title obsolete. To avoid a breaking change, we export the Title as part of
       * the plugin, which one will be re-exposed in the chart.js file.
       * https://github.com/chartjs/Chart.js/pull/2640
       * @private
       */
      _element: Title,
  
      beforeInit: function (chart) {
        var titleOpts = chart.options.title;
  
        if (titleOpts) {
          createNewTitleBlockAndAttach(chart, titleOpts);
        }
      },
  
      beforeUpdate: function (chart) {
        var titleOpts = chart.options.title;
        var titleBlock = chart.titleBlock;
  
        if (titleOpts) {
          helpers$1.mergeIf(titleOpts, core_defaults.global.title);
  
          if (titleBlock) {
            core_layouts.configure(chart, titleBlock, titleOpts);
            titleBlock.options = titleOpts;
          } else {
            createNewTitleBlockAndAttach(chart, titleOpts);
          }
        } else if (titleBlock) {
          core_layouts.removeBox(chart, titleBlock);
          delete chart.titleBlock;
        }
      }
    };
  
    var plugins = {};
    var filler = plugin_filler;
    var legend = plugin_legend;
    var title = plugin_title;
    plugins.filler = filler;
    plugins.legend = legend;
    plugins.title = title;
  
    /**
     * @namespace Chart
     */
  
  
    core_controller.helpers = helpers$1;
  
  // @todo dispatch these helpers into appropriated helpers/helpers.* file and write unit tests!
    core_helpers(core_controller);
  
    core_controller._adapters = core_adapters;
    core_controller.Animation = core_animation;
    core_controller.animationService = core_animations;
    core_controller.controllers = controllers;
    core_controller.DatasetController = core_datasetController;
    core_controller.defaults = core_defaults;
    core_controller.Element = core_element;
    core_controller.elements = elements;
    core_controller.Interaction = core_interaction;
    core_controller.layouts = core_layouts;
    core_controller.platform = platform;
    core_controller.plugins = core_plugins;
    core_controller.Scale = core_scale;
    core_controller.scaleService = core_scaleService;
    core_controller.Ticks = core_ticks;
    core_controller.Tooltip = core_tooltip;
  
  // Register built-in scales
  
    core_controller.helpers.each(scales, function (scale, type) {
      core_controller.scaleService.registerScaleType(type, scale, scale._defaults);
    });
  
  // Load to register built-in adapters (as side effects)
  
  
  // Loading built-in plugins
  
    for (var k in plugins) {
      if (plugins.hasOwnProperty(k)) {
        core_controller.plugins.register(plugins[k]);
      }
    }
  
    core_controller.platform.initialize();
  
    var src = core_controller;
    if (typeof window !== 'undefined') {
      window.Chart = core_controller;
    }
  
  // DEPRECATIONS
  
    /**
     * Provided for backward compatibility, not available anymore
     * @namespace Chart.Chart
     * @deprecated since version 2.8.0
     * @todo remove at version 3
     * @private
     */
    core_controller.Chart = core_controller;
  
    /**
     * Provided for backward compatibility, not available anymore
     * @namespace Chart.Legend
     * @deprecated since version 2.1.5
     * @todo remove at version 3
     * @private
     */
    core_controller.Legend = plugins.legend._element;
  
    /**
     * Provided for backward compatibility, not available anymore
     * @namespace Chart.Title
     * @deprecated since version 2.1.5
     * @todo remove at version 3
     * @private
     */
    core_controller.Title = plugins.title._element;
  
    /**
     * Provided for backward compatibility, use Chart.plugins instead
     * @namespace Chart.pluginService
     * @deprecated since version 2.1.5
     * @todo remove at version 3
     * @private
     */
    core_controller.pluginService = core_controller.plugins;
  
    /**
     * Provided for backward compatibility, inheriting from Chart.PlugingBase has no
     * effect, instead simply create/register plugins via plain JavaScript objects.
     * @interface Chart.PluginBase
     * @deprecated since version 2.5.0
     * @todo remove at version 3
     * @private
     */
    core_controller.PluginBase = core_controller.Element.extend({});
  
    /**
     * Provided for backward compatibility, use Chart.helpers.canvas instead.
     * @namespace Chart.canvasHelpers
     * @deprecated since version 2.6.0
     * @todo remove at version 3
     * @private
     */
    core_controller.canvasHelpers = core_controller.helpers.canvas;
  
    /**
     * Provided for backward compatibility, use Chart.layouts instead.
     * @namespace Chart.layoutService
     * @deprecated since version 2.7.3
     * @todo remove at version 3
     * @private
     */
    core_controller.layoutService = core_controller.layouts;
  
    /**
     * Provided for backward compatibility, not available anymore.
     * @namespace Chart.LinearScaleBase
     * @deprecated since version 2.8
     * @todo remove at version 3
     * @private
     */
    core_controller.LinearScaleBase = scale_linearbase;
  
    /**
     * Provided for backward compatibility, instead we should create a new Chart
     * by setting the type in the config (`new Chart(id, {type: '{chart-type}'}`).
     * @deprecated since version 2.8.0
     * @todo remove at version 3
     */
    core_controller.helpers.each(
        [
          'Bar',
          'Bubble',
          'Doughnut',
          'Line',
          'PolarArea',
          'Radar',
          'Scatter'
        ],
        function (klass) {
          core_controller[klass] = function (ctx, cfg) {
            return new core_controller(ctx, core_controller.helpers.merge(cfg || {}, {
              type: klass.charAt(0).toLowerCase() + klass.slice(1)
            }));
          };
        }
    );
  
    return src;
  
  })));
  