text: 
  /**
   * @license
   *
   * chroma.js - JavaScript library for color conversions
   * 
   * Copyright (c) 2011-2017, Gregor Aisch
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 
   * 3. The name Gregor Aisch may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL GREGOR AISCH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  (function() {
    var Color, DEG2RAD, LAB_CONSTANTS, PI, PITHIRD, RAD2DEG, TWOPI, _average_lrgb, _guess_formats, _guess_formats_sorted, _input, _interpolators, abs, atan2, bezier, blend, blend_f, brewer, burn, chroma, clip_rgb, cmyk2rgb, colors, cos, css2rgb, darken, dodge, each, floor, hcg2rgb, hex2rgb, hsi2rgb, hsl2css, hsl2rgb, hsv2rgb, interpolate, interpolate_hsx, interpolate_lab, interpolate_lrgb, interpolate_num, interpolate_rgb, lab2lch, lab2rgb, lab_xyz, lch2lab, lch2rgb, lighten, limit, log, luminance_x, m, max, multiply, normal, num2rgb, overlay, pow, rgb2cmyk, rgb2css, rgb2hcg, rgb2hex, rgb2hsi, rgb2hsl, rgb2hsv, rgb2lab, rgb2lch, rgb2luminance, rgb2num, rgb2temperature, rgb2xyz, rgb_xyz, rnd, root, round, screen, sin, sqrt, temperature2rgb, type, unpack, w3cx11, xyz_lab, xyz_rgb,
      slice = [].slice;
  
    type = (function() {
  
      /*
      for browser-safe type checking+
      ported from jQuery's $.type
       */
      var classToType, len, name, o, ref;
      classToType = {};
      ref = "Boolean Number String Function Array Date RegExp Undefined Null".split(" ");
      for (o = 0, len = ref.length; o < len; o++) {
        name = ref[o];
        classToType["[object " + name + "]"] = name.toLowerCase();
      }
      return function(obj) {
        var strType;
        strType = Object.prototype.toString.call(obj);
        return classToType[strType] || "object";
      };
    })();
  
    limit = function(x, min, max) {
      if (min == null) {
        min = 0;
      }
      if (max == null) {
        max = 1;
      }
      if (x < min) {
        x = min;
      }
      if (x > max) {
        x = max;
      }
      return x;
    };
  
    unpack = function(args) {
      if (args.length >= 3) {
        return Array.prototype.slice.call(args);
      } else {
        return args[0];
      }
    };
  
    clip_rgb = function(rgb) {
      var i, o;
      rgb._clipped = false;
      rgb._unclipped = rgb.slice(0);
      for (i = o = 0; o < 3; i = ++o) {
        if (i < 3) {
          if (rgb[i] < 0 || rgb[i] > 255) {
            rgb._clipped = true;
          }
          if (rgb[i] < 0) {
            rgb[i] = 0;
          }
          if (rgb[i] > 255) {
            rgb[i] = 255;
          }
        } else if (i === 3) {
          if (rgb[i] < 0) {
            rgb[i] = 0;
          }
          if (rgb[i] > 1) {
            rgb[i] = 1;
          }
        }
      }
      if (!rgb._clipped) {
        delete rgb._unclipped;
      }
      return rgb;
    };
  
    PI = Math.PI, round = Math.round, cos = Math.cos, floor = Math.floor, pow = Math.pow, log = Math.log, sin = Math.sin, sqrt = Math.sqrt, atan2 = Math.atan2, max = Math.max, abs = Math.abs;
  
    TWOPI = PI * 2;
  
    PITHIRD = PI / 3;
  
    DEG2RAD = PI / 180;
  
    RAD2DEG = 180 / PI;
  
    chroma = function() {
      if (arguments[0] instanceof Color) {
        return arguments[0];
      }
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, arguments, function(){});
    };
  
    chroma["default"] = chroma;
  
    _interpolators = [];
  
    if ((typeof module !== "undefined" && module !== null) && (module.exports != null)) {
      module.exports = chroma;
    }
  
    if (typeof define === 'function' && define.amd) {
      define([], function() {
        return chroma;
      });
    } else {
      root = typeof exports !== "undefined" && exports !== null ? exports : this;
      root.chroma = chroma;
    }
  
    chroma.version = '1.4.1';
  
    _input = {};
  
    _guess_formats = [];
  
    _guess_formats_sorted = false;
  
    Color = (function() {
      function Color() {
        var arg, args, chk, len, len1, me, mode, o, w;
        me = this;
        args = [];
        for (o = 0, len = arguments.length; o < len; o++) {
          arg = arguments[o];
          if (arg != null) {
            args.push(arg);
          }
        }
        if (args.length > 1) {
          mode = args[args.length - 1];
        }
        if (_input[mode] != null) {
          me._rgb = clip_rgb(_input[mode](unpack(args.slice(0, -1))));
        } else {
          if (!_guess_formats_sorted) {
            _guess_formats = _guess_formats.sort(function(a, b) {
              return b.p - a.p;
            });
            _guess_formats_sorted = true;
          }
          for (w = 0, len1 = _guess_formats.length; w < len1; w++) {
            chk = _guess_formats[w];
            mode = chk.test.apply(chk, args);
            if (mode) {
              break;
            }
          }
          if (mode) {
            me._rgb = clip_rgb(_input[mode].apply(_input, args));
          }
        }
        if (me._rgb == null) {
          console.warn('unknown format: ' + args);
        }
        if (me._rgb == null) {
          me._rgb = [0, 0, 0];
        }
        if (me._rgb.length === 3) {
          me._rgb.push(1);
        }
      }
  
      Color.prototype.toString = function() {
        return this.hex();
      };
  
      return Color;
  
    })();
  
    chroma._input = _input;
  
  
    /**
    	ColorBrewer colors for chroma.js
    
    	Copyright (c) 2002 Cynthia Brewer, Mark Harrower, and The 
    	Pennsylvania State University.
    
    	Licensed under the Apache License, Version 2.0 (the "License"); 
    	you may not use this file except in compliance with the License.
    	You may obtain a copy of the License at	
    	http://www.apache.org/licenses/LICENSE-2.0
    
    	Unless required by applicable law or agreed to in writing, software distributed
    	under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
    	CONDITIONS OF ANY KIND, either express or implied. See the License for the
    	specific language governing permissions and limitations under the License.
    
        @preserve
     */
  
    chroma.brewer = brewer = {
      OrRd: ['#fff7ec', '#fee8c8', '#fdd49e', '#fdbb84', '#fc8d59', '#ef6548', '#d7301f', '#b30000', '#7f0000'],
      PuBu: ['#fff7fb', '#ece7f2', '#d0d1e6', '#a6bddb', '#74a9cf', '#3690c0', '#0570b0', '#045a8d', '#023858'],
      BuPu: ['#f7fcfd', '#e0ecf4', '#bfd3e6', '#9ebcda', '#8c96c6', '#8c6bb1', '#88419d', '#810f7c', '#4d004b'],
      Oranges: ['#fff5eb', '#fee6ce', '#fdd0a2', '#fdae6b', '#fd8d3c', '#f16913', '#d94801', '#a63603', '#7f2704'],
      BuGn: ['#f7fcfd', '#e5f5f9', '#ccece6', '#99d8c9', '#66c2a4', '#41ae76', '#238b45', '#006d2c', '#00441b'],
      YlOrBr: ['#ffffe5', '#fff7bc', '#fee391', '#fec44f', '#fe9929', '#ec7014', '#cc4c02', '#993404', '#662506'],
      YlGn: ['#ffffe5', '#f7fcb9', '#d9f0a3', '#addd8e', '#78c679', '#41ab5d', '#238443', '#006837', '#004529'],
      Reds: ['#fff5f0', '#fee0d2', '#fcbba1', '#fc9272', '#fb6a4a', '#ef3b2c', '#cb181d', '#a50f15', '#67000d'],
      RdPu: ['#fff7f3', '#fde0dd', '#fcc5c0', '#fa9fb5', '#f768a1', '#dd3497', '#ae017e', '#7a0177', '#49006a'],
      Greens: ['#f7fcf5', '#e5f5e0', '#c7e9c0', '#a1d99b', '#74c476', '#41ab5d', '#238b45', '#006d2c', '#00441b'],
      YlGnBu: ['#ffffd9', '#edf8b1', '#c7e9b4', '#7fcdbb', '#41b6c4', '#1d91c0', '#225ea8', '#253494', '#081d58'],
      Purples: ['#fcfbfd', '#efedf5', '#dadaeb', '#bcbddc', '#9e9ac8', '#807dba', '#6a51a3', '#54278f', '#3f007d'],
      GnBu: ['#f7fcf0', '#e0f3db', '#ccebc5', '#a8ddb5', '#7bccc4', '#4eb3d3', '#2b8cbe', '#0868ac', '#084081'],
      Greys: ['#ffffff', '#f0f0f0', '#d9d9d9', '#bdbdbd', '#969696', '#737373', '#525252', '#252525', '#000000'],
      YlOrRd: ['#ffffcc', '#ffeda0', '#fed976', '#feb24c', '#fd8d3c', '#fc4e2a', '#e31a1c', '#bd0026', '#800026'],
      PuRd: ['#f7f4f9', '#e7e1ef', '#d4b9da', '#c994c7', '#df65b0', '#e7298a', '#ce1256', '#980043', '#67001f'],
      Blues: ['#f7fbff', '#deebf7', '#c6dbef', '#9ecae1', '#6baed6', '#4292c6', '#2171b5', '#08519c', '#08306b'],
      PuBuGn: ['#fff7fb', '#ece2f0', '#d0d1e6', '#a6bddb', '#67a9cf', '#3690c0', '#02818a', '#016c59', '#014636'],
      Viridis: ['#440154', '#482777', '#3f4a8a', '#31678e', '#26838f', '#1f9d8a', '#6cce5a', '#b6de2b', '#fee825'],
      Spectral: ['#9e0142', '#d53e4f', '#f46d43', '#fdae61', '#fee08b', '#ffffbf', '#e6f598', '#abdda4', '#66c2a5', '#3288bd', '#5e4fa2'],
      RdYlGn: ['#a50026', '#d73027', '#f46d43', '#fdae61', '#fee08b', '#ffffbf', '#d9ef8b', '#a6d96a', '#66bd63', '#1a9850', '#006837'],
      RdBu: ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#f7f7f7', '#d1e5f0', '#92c5de', '#4393c3', '#2166ac', '#053061'],
      PiYG: ['#8e0152', '#c51b7d', '#de77ae', '#f1b6da', '#fde0ef', '#f7f7f7', '#e6f5d0', '#b8e186', '#7fbc41', '#4d9221', '#276419'],
      PRGn: ['#40004b', '#762a83', '#9970ab', '#c2a5cf', '#e7d4e8', '#f7f7f7', '#d9f0d3', '#a6dba0', '#5aae61', '#1b7837', '#00441b'],
      RdYlBu: ['#a50026', '#d73027', '#f46d43', '#fdae61', '#fee090', '#ffffbf', '#e0f3f8', '#abd9e9', '#74add1', '#4575b4', '#313695'],
      BrBG: ['#543005', '#8c510a', '#bf812d', '#dfc27d', '#f6e8c3', '#f5f5f5', '#c7eae5', '#80cdc1', '#35978f', '#01665e', '#003c30'],
      RdGy: ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#ffffff', '#e0e0e0', '#bababa', '#878787', '#4d4d4d', '#1a1a1a'],
      PuOr: ['#7f3b08', '#b35806', '#e08214', '#fdb863', '#fee0b6', '#f7f7f7', '#d8daeb', '#b2abd2', '#8073ac', '#542788', '#2d004b'],
      Set2: ['#66c2a5', '#fc8d62', '#8da0cb', '#e78ac3', '#a6d854', '#ffd92f', '#e5c494', '#b3b3b3'],
      Accent: ['#7fc97f', '#beaed4', '#fdc086', '#ffff99', '#386cb0', '#f0027f', '#bf5b17', '#666666'],
      Set1: ['#e41a1c', '#377eb8', '#4daf4a', '#984ea3', '#ff7f00', '#ffff33', '#a65628', '#f781bf', '#999999'],
      Set3: ['#8dd3c7', '#ffffb3', '#bebada', '#fb8072', '#80b1d3', '#fdb462', '#b3de69', '#fccde5', '#d9d9d9', '#bc80bd', '#ccebc5', '#ffed6f'],
      Dark2: ['#1b9e77', '#d95f02', '#7570b3', '#e7298a', '#66a61e', '#e6ab02', '#a6761d', '#666666'],
      Paired: ['#a6cee3', '#1f78b4', '#b2df8a', '#33a02c', '#fb9a99', '#e31a1c', '#fdbf6f', '#ff7f00', '#cab2d6', '#6a3d9a', '#ffff99', '#b15928'],
      Pastel2: ['#b3e2cd', '#fdcdac', '#cbd5e8', '#f4cae4', '#e6f5c9', '#fff2ae', '#f1e2cc', '#cccccc'],
      Pastel1: ['#fbb4ae', '#b3cde3', '#ccebc5', '#decbe4', '#fed9a6', '#ffffcc', '#e5d8bd', '#fddaec', '#f2f2f2']
    };
  
    (function() {
      var key, results;
      results = [];
      for (key in brewer) {
        results.push(brewer[key.toLowerCase()] = brewer[key]);
      }
      return results;
    })();
  
  
    /**
    	X11 color names
    
    	http://www.w3.org/TR/css3-color/#svg-color
     */
  
    w3cx11 = {
      aliceblue: '#f0f8ff',
      antiquewhite: '#faebd7',
      aqua: '#00ffff',
      aquamarine: '#7fffd4',
      azure: '#f0ffff',
      beige: '#f5f5dc',
      bisque: '#ffe4c4',
      black: '#000000',
      blanchedalmond: '#ffebcd',
      blue: '#0000ff',
      blueviolet: '#8a2be2',
      brown: '#a52a2a',
      burlywood: '#deb887',
      cadetblue: '#5f9ea0',
      chartreuse: '#7fff00',
      chocolate: '#d2691e',
      coral: '#ff7f50',
      cornflower: '#6495ed',
      cornflowerblue: '#6495ed',
      cornsilk: '#fff8dc',
      crimson: '#dc143c',
      cyan: '#00ffff',
      darkblue: '#00008b',
      darkcyan: '#008b8b',
      darkgoldenrod: '#b8860b',
      darkgray: '#a9a9a9',
      darkgreen: '#006400',
      darkgrey: '#a9a9a9',
      darkkhaki: '#bdb76b',
      darkmagenta: '#8b008b',
      darkolivegreen: '#556b2f',
      darkorange: '#ff8c00',
      darkorchid: '#9932cc',
      darkred: '#8b0000',
      darksalmon: '#e9967a',
      darkseagreen: '#8fbc8f',
      darkslateblue: '#483d8b',
      darkslategray: '#2f4f4f',
      darkslategrey: '#2f4f4f',
      darkturquoise: '#00ced1',
      darkviolet: '#9400d3',
      deeppink: '#ff1493',
      deepskyblue: '#00bfff',
      dimgray: '#696969',
      dimgrey: '#696969',
      dodgerblue: '#1e90ff',
      firebrick: '#b22222',
      floralwhite: '#fffaf0',
      forestgreen: '#228b22',
      fuchsia: '#ff00ff',
      gainsboro: '#dcdcdc',
      ghostwhite: '#f8f8ff',
      gold: '#ffd700',
      goldenrod: '#daa520',
      gray: '#808080',
      green: '#008000',
      greenyellow: '#adff2f',
      grey: '#808080',
      honeydew: '#f0fff0',
      hotpink: '#ff69b4',
      indianred: '#cd5c5c',
      indigo: '#4b0082',
      ivory: '#fffff0',
      khaki: '#f0e68c',
      laserlemon: '#ffff54',
      lavender: '#e6e6fa',
      lavenderblush: '#fff0f5',
      lawngreen: '#7cfc00',
      lemonchiffon: '#fffacd',
      lightblue: '#add8e6',
      lightcoral: '#f08080',
      lightcyan: '#e0ffff',
      lightgoldenrod: '#fafad2',
      lightgoldenrodyellow: '#fafad2',
      lightgray: '#d3d3d3',
      lightgreen: '#90ee90',
      lightgrey: '#d3d3d3',
      lightpink: '#ffb6c1',
      lightsalmon: '#ffa07a',
      lightseagreen: '#20b2aa',
      lightskyblue: '#87cefa',
      lightslategray: '#778899',
      lightslategrey: '#778899',
      lightsteelblue: '#b0c4de',
      lightyellow: '#ffffe0',
      lime: '#00ff00',
      limegreen: '#32cd32',
      linen: '#faf0e6',
      magenta: '#ff00ff',
      maroon: '#800000',
      maroon2: '#7f0000',
      maroon3: '#b03060',
      mediumaquamarine: '#66cdaa',
      mediumblue: '#0000cd',
      mediumorchid: '#ba55d3',
      mediumpurple: '#9370db',
      mediumseagreen: '#3cb371',
      mediumslateblue: '#7b68ee',
      mediumspringgreen: '#00fa9a',
      mediumturquoise: '#48d1cc',
      mediumvioletred: '#c71585',
      midnightblue: '#191970',
      mintcream: '#f5fffa',
      mistyrose: '#ffe4e1',
      moccasin: '#ffe4b5',
      navajowhite: '#ffdead',
      navy: '#000080',
      oldlace: '#fdf5e6',
      olive: '#808000',
      olivedrab: '#6b8e23',
      orange: '#ffa500',
      orangered: '#ff4500',
      orchid: '#da70d6',
      palegoldenrod: '#eee8aa',
      palegreen: '#98fb98',
      paleturquoise: '#afeeee',
      palevioletred: '#db7093',
      papayawhip: '#ffefd5',
      peachpuff: '#ffdab9',
      peru: '#cd853f',
      pink: '#ffc0cb',
      plum: '#dda0dd',
      powderblue: '#b0e0e6',
      purple: '#800080',
      purple2: '#7f007f',
      purple3: '#a020f0',
      rebeccapurple: '#663399',
      red: '#ff0000',
      rosybrown: '#bc8f8f',
      royalblue: '#4169e1',
      saddlebrown: '#8b4513',
      salmon: '#fa8072',
      sandybrown: '#f4a460',
      seagreen: '#2e8b57',
      seashell: '#fff5ee',
      sienna: '#a0522d',
      silver: '#c0c0c0',
      skyblue: '#87ceeb',
      slateblue: '#6a5acd',
      slategray: '#708090',
      slategrey: '#708090',
      snow: '#fffafa',
      springgreen: '#00ff7f',
      steelblue: '#4682b4',
      tan: '#d2b48c',
      teal: '#008080',
      thistle: '#d8bfd8',
      tomato: '#ff6347',
      turquoise: '#40e0d0',
      violet: '#ee82ee',
      wheat: '#f5deb3',
      white: '#ffffff',
      whitesmoke: '#f5f5f5',
      yellow: '#ffff00',
      yellowgreen: '#9acd32'
    };
  
    chroma.colors = colors = w3cx11;
  
    lab2rgb = function() {
      var a, args, b, g, l, r, x, y, z;
      args = unpack(arguments);
      l = args[0], a = args[1], b = args[2];
      y = (l + 16) / 116;
      x = isNaN(a) ? y : y + a / 500;
      z = isNaN(b) ? y : y - b / 200;
      y = LAB_CONSTANTS.Yn * lab_xyz(y);
      x = LAB_CONSTANTS.Xn * lab_xyz(x);
      z = LAB_CONSTANTS.Zn * lab_xyz(z);
      r = xyz_rgb(3.2404542 * x - 1.5371385 * y - 0.4985314 * z);
      g = xyz_rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z);
      b = xyz_rgb(0.0556434 * x - 0.2040259 * y + 1.0572252 * z);
      return [r, g, b, args.length > 3 ? args[3] : 1];
    };
  
    xyz_rgb = function(r) {
      return 255 * (r <= 0.00304 ? 12.92 * r : 1.055 * pow(r, 1 / 2.4) - 0.055);
    };
  
    lab_xyz = function(t) {
      if (t > LAB_CONSTANTS.t1) {
        return t * t * t;
      } else {
        return LAB_CONSTANTS.t2 * (t - LAB_CONSTANTS.t0);
      }
    };
  
    LAB_CONSTANTS = {
      Kn: 18,
      Xn: 0.950470,
      Yn: 1,
      Zn: 1.088830,
      t0: 0.137931034,
      t1: 0.206896552,
      t2: 0.12841855,
      t3: 0.008856452
    };
  
    rgb2lab = function() {
      var b, g, r, ref, ref1, x, y, z;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      ref1 = rgb2xyz(r, g, b), x = ref1[0], y = ref1[1], z = ref1[2];
      return [116 * y - 16, 500 * (x - y), 200 * (y - z)];
    };
  
    rgb_xyz = function(r) {
      if ((r /= 255) <= 0.04045) {
        return r / 12.92;
      } else {
        return pow((r + 0.055) / 1.055, 2.4);
      }
    };
  
    xyz_lab = function(t) {
      if (t > LAB_CONSTANTS.t3) {
        return pow(t, 1 / 3);
      } else {
        return t / LAB_CONSTANTS.t2 + LAB_CONSTANTS.t0;
      }
    };
  
    rgb2xyz = function() {
      var b, g, r, ref, x, y, z;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      r = rgb_xyz(r);
      g = rgb_xyz(g);
      b = rgb_xyz(b);
      x = xyz_lab((0.4124564 * r + 0.3575761 * g + 0.1804375 * b) / LAB_CONSTANTS.Xn);
      y = xyz_lab((0.2126729 * r + 0.7151522 * g + 0.0721750 * b) / LAB_CONSTANTS.Yn);
      z = xyz_lab((0.0193339 * r + 0.1191920 * g + 0.9503041 * b) / LAB_CONSTANTS.Zn);
      return [x, y, z];
    };
  
    chroma.lab = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['lab']), function(){});
    };
  
    _input.lab = lab2rgb;
  
    Color.prototype.lab = function() {
      return rgb2lab(this._rgb);
    };
  
    bezier = function(colors) {
      var I, I0, I1, c, lab0, lab1, lab2, lab3, ref, ref1, ref2;
      colors = (function() {
        var len, o, results;
        results = [];
        for (o = 0, len = colors.length; o < len; o++) {
          c = colors[o];
          results.push(chroma(c));
        }
        return results;
      })();
      if (colors.length === 2) {
        ref = (function() {
          var len, o, results;
          results = [];
          for (o = 0, len = colors.length; o < len; o++) {
            c = colors[o];
            results.push(c.lab());
          }
          return results;
        })(), lab0 = ref[0], lab1 = ref[1];
        I = function(t) {
          var i, lab;
          lab = (function() {
            var o, results;
            results = [];
            for (i = o = 0; o <= 2; i = ++o) {
              results.push(lab0[i] + t * (lab1[i] - lab0[i]));
            }
            return results;
          })();
          return chroma.lab.apply(chroma, lab);
        };
      } else if (colors.length === 3) {
        ref1 = (function() {
          var len, o, results;
          results = [];
          for (o = 0, len = colors.length; o < len; o++) {
            c = colors[o];
            results.push(c.lab());
          }
          return results;
        })(), lab0 = ref1[0], lab1 = ref1[1], lab2 = ref1[2];
        I = function(t) {
          var i, lab;
          lab = (function() {
            var o, results;
            results = [];
            for (i = o = 0; o <= 2; i = ++o) {
              results.push((1 - t) * (1 - t) * lab0[i] + 2 * (1 - t) * t * lab1[i] + t * t * lab2[i]);
            }
            return results;
          })();
          return chroma.lab.apply(chroma, lab);
        };
      } else if (colors.length === 4) {
        ref2 = (function() {
          var len, o, results;
          results = [];
          for (o = 0, len = colors.length; o < len; o++) {
            c = colors[o];
            results.push(c.lab());
          }
          return results;
        })(), lab0 = ref2[0], lab1 = ref2[1], lab2 = ref2[2], lab3 = ref2[3];
        I = function(t) {
          var i, lab;
          lab = (function() {
            var o, results;
            results = [];
            for (i = o = 0; o <= 2; i = ++o) {
              results.push((1 - t) * (1 - t) * (1 - t) * lab0[i] + 3 * (1 - t) * (1 - t) * t * lab1[i] + 3 * (1 - t) * t * t * lab2[i] + t * t * t * lab3[i]);
            }
            return results;
          })();
          return chroma.lab.apply(chroma, lab);
        };
      } else if (colors.length === 5) {
        I0 = bezier(colors.slice(0, 3));
        I1 = bezier(colors.slice(2, 5));
        I = function(t) {
          if (t < 0.5) {
            return I0(t * 2);
          } else {
            return I1((t - 0.5) * 2);
          }
        };
      }
      return I;
    };
  
    chroma.bezier = function(colors) {
      var f;
      f = bezier(colors);
      f.scale = function() {
        return chroma.scale(f);
      };
      return f;
    };
  
    chroma.cubehelix = function(start, rotations, hue, gamma, lightness) {
      var dh, dl, f;
      if (start == null) {
        start = 300;
      }
      if (rotations == null) {
        rotations = -1.5;
      }
      if (hue == null) {
        hue = 1;
      }
      if (gamma == null) {
        gamma = 1;
      }
      if (lightness == null) {
        lightness = [0, 1];
      }
      dh = 0;
      if (type(lightness) === 'array') {
        dl = lightness[1] - lightness[0];
      } else {
        dl = 0;
        lightness = [lightness, lightness];
      }
      f = function(fract) {
        var a, amp, b, cos_a, g, h, l, r, sin_a;
        a = TWOPI * ((start + 120) / 360 + rotations * fract);
        l = pow(lightness[0] + dl * fract, gamma);
        h = dh !== 0 ? hue[0] + fract * dh : hue;
        amp = h * l * (1 - l) / 2;
        cos_a = cos(a);
        sin_a = sin(a);
        r = l + amp * (-0.14861 * cos_a + 1.78277 * sin_a);
        g = l + amp * (-0.29227 * cos_a - 0.90649 * sin_a);
        b = l + amp * (+1.97294 * cos_a);
        return chroma(clip_rgb([r * 255, g * 255, b * 255, 1]));
      };
      f.start = function(s) {
        if (s == null) {
          return start;
        }
        start = s;
        return f;
      };
      f.rotations = function(r) {
        if (r == null) {
          return rotations;
        }
        rotations = r;
        return f;
      };
      f.gamma = function(g) {
        if (g == null) {
          return gamma;
        }
        gamma = g;
        return f;
      };
      f.hue = function(h) {
        if (h == null) {
          return hue;
        }
        hue = h;
        if (type(hue) === 'array') {
          dh = hue[1] - hue[0];
          if (dh === 0) {
            hue = hue[1];
          }
        } else {
          dh = 0;
        }
        return f;
      };
      f.lightness = function(h) {
        if (h == null) {
          return lightness;
        }
        if (type(h) === 'array') {
          lightness = h;
          dl = h[1] - h[0];
        } else {
          lightness = [h, h];
          dl = 0;
        }
        return f;
      };
      f.scale = function() {
        return chroma.scale(f);
      };
      f.hue(hue);
      return f;
    };
  
    chroma.random = function() {
      var code, digits, i, o;
      digits = '0123456789abcdef';
      code = '#';
      for (i = o = 0; o < 6; i = ++o) {
        code += digits.charAt(floor(Math.random() * 16));
      }
      return new Color(code);
    };
  
    _interpolators = [];
  
    interpolate = function(col1, col2, f, m) {
      var interpol, len, o, res;
      if (f == null) {
        f = 0.5;
      }
      if (m == null) {
        m = 'rgb';
      }
  
      /*
      interpolates between colors
      f = 0 --> me
      f = 1 --> col
       */
      if (type(col1) !== 'object') {
        col1 = chroma(col1);
      }
      if (type(col2) !== 'object') {
        col2 = chroma(col2);
      }
      for (o = 0, len = _interpolators.length; o < len; o++) {
        interpol = _interpolators[o];
        if (m === interpol[0]) {
          res = interpol[1](col1, col2, f, m);
          break;
        }
      }
      if (res == null) {
        throw "color mode " + m + " is not supported";
      }
      return res.alpha(col1.alpha() + f * (col2.alpha() - col1.alpha()));
    };
  
    chroma.interpolate = interpolate;
  
    Color.prototype.interpolate = function(col2, f, m) {
      return interpolate(this, col2, f, m);
    };
  
    chroma.mix = interpolate;
  
    Color.prototype.mix = Color.prototype.interpolate;
  
    _input.rgb = function() {
      var k, ref, results, v;
      ref = unpack(arguments);
      results = [];
      for (k in ref) {
        v = ref[k];
        results.push(v);
      }
      return results;
    };
  
    chroma.rgb = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['rgb']), function(){});
    };
  
    Color.prototype.rgb = function(round) {
      if (round == null) {
        round = true;
      }
      if (round) {
        return this._rgb.map(Math.round).slice(0, 3);
      } else {
        return this._rgb.slice(0, 3);
      }
    };
  
    Color.prototype.rgba = function(round) {
      if (round == null) {
        round = true;
      }
      if (!round) {
        return this._rgb.slice(0);
      }
      return [Math.round(this._rgb[0]), Math.round(this._rgb[1]), Math.round(this._rgb[2]), this._rgb[3]];
    };
  
    _guess_formats.push({
      p: 3,
      test: function(n) {
        var a;
        a = unpack(arguments);
        if (type(a) === 'array' && a.length === 3) {
          return 'rgb';
        }
        if (a.length === 4 && type(a[3]) === "number" && a[3] >= 0 && a[3] <= 1) {
          return 'rgb';
        }
      }
    });
  
    _input.lrgb = _input.rgb;
  
    interpolate_lrgb = function(col1, col2, f, m) {
      var xyz0, xyz1;
      xyz0 = col1._rgb;
      xyz1 = col2._rgb;
      return new Color(sqrt(pow(xyz0[0], 2) * (1 - f) + pow(xyz1[0], 2) * f), sqrt(pow(xyz0[1], 2) * (1 - f) + pow(xyz1[1], 2) * f), sqrt(pow(xyz0[2], 2) * (1 - f) + pow(xyz1[2], 2) * f), m);
    };
  
    _average_lrgb = function(colors) {
      var col, f, len, o, rgb, xyz;
      f = 1 / colors.length;
      xyz = [0, 0, 0, 0];
      for (o = 0, len = colors.length; o < len; o++) {
        col = colors[o];
        rgb = col._rgb;
        xyz[0] += pow(rgb[0], 2) * f;
        xyz[1] += pow(rgb[1], 2) * f;
        xyz[2] += pow(rgb[2], 2) * f;
        xyz[3] += rgb[3] * f;
      }
      xyz[0] = sqrt(xyz[0]);
      xyz[1] = sqrt(xyz[1]);
      xyz[2] = sqrt(xyz[2]);
      if (xyz[3] > 1) {
        xyz[3] = 1;
      }
      return new Color(clip_rgb(xyz));
    };
  
    _interpolators.push(['lrgb', interpolate_lrgb]);
  
    chroma.average = function(colors, mode) {
      var A, alpha, c, cnt, dx, dy, first, i, l, len, o, xyz, xyz2;
      if (mode == null) {
        mode = 'rgb';
      }
      l = colors.length;
      colors = colors.map(function(c) {
        return chroma(c);
      });
      first = colors.splice(0, 1)[0];
      if (mode === 'lrgb') {
        return _average_lrgb(colors);
      }
      xyz = first.get(mode);
      cnt = [];
      dx = 0;
      dy = 0;
      for (i in xyz) {
        xyz[i] = xyz[i] || 0;
        cnt.push(isNaN(xyz[i]) ? 0 : 1);
        if (mode.charAt(i) === 'h' && !isNaN(xyz[i])) {
          A = xyz[i] / 180 * PI;
          dx += cos(A);
          dy += sin(A);
        }
      }
      alpha = first.alpha();
      for (o = 0, len = colors.length; o < len; o++) {
        c = colors[o];
        xyz2 = c.get(mode);
        alpha += c.alpha();
        for (i in xyz) {
          if (!isNaN(xyz2[i])) {
            cnt[i] += 1;
            if (mode.charAt(i) === 'h') {
              A = xyz2[i] / 180 * PI;
              dx += cos(A);
              dy += sin(A);
            } else {
              xyz[i] += xyz2[i];
            }
          }
        }
      }
      for (i in xyz) {
        if (mode.charAt(i) === 'h') {
          A = atan2(dy / cnt[i], dx / cnt[i]) / PI * 180;
          while (A < 0) {
            A += 360;
          }
          while (A >= 360) {
            A -= 360;
          }
          xyz[i] = A;
        } else {
          xyz[i] = xyz[i] / cnt[i];
        }
      }
      return chroma(xyz, mode).alpha(alpha / l);
    };
  
    hex2rgb = function(hex) {
      var a, b, g, r, rgb, u;
      if (hex.match(/^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/)) {
        if (hex.length === 4 || hex.length === 7) {
          hex = hex.substr(1);
        }
        if (hex.length === 3) {
          hex = hex.split("");
          hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
        }
        u = parseInt(hex, 16);
        r = u >> 16;
        g = u >> 8 & 0xFF;
        b = u & 0xFF;
        return [r, g, b, 1];
      }
      if (hex.match(/^#?([A-Fa-f0-9]{8})$/)) {
        if (hex.length === 9) {
          hex = hex.substr(1);
        }
        u = parseInt(hex, 16);
        r = u >> 24 & 0xFF;
        g = u >> 16 & 0xFF;
        b = u >> 8 & 0xFF;
        a = round((u & 0xFF) / 0xFF * 100) / 100;
        return [r, g, b, a];
      }
      if ((_input.css != null) && (rgb = _input.css(hex))) {
        return rgb;
      }
      throw "unknown color: " + hex;
    };
  
    rgb2hex = function(channels, mode) {
      var a, b, g, hxa, r, str, u;
      if (mode == null) {
        mode = 'auto';
      }
      r = channels[0], g = channels[1], b = channels[2], a = channels[3];
      if (mode === 'auto') {
        mode = a < 1 ? 'rgba' : 'rgb';
      }
      r = Math.round(r);
      g = Math.round(g);
      b = Math.round(b);
      u = r << 16 | g << 8 | b;
      str = "000000" + u.toString(16);
      str = str.substr(str.length - 6);
      hxa = '0' + round(a * 255).toString(16);
      hxa = hxa.substr(hxa.length - 2);
      return "#" + (function() {
        switch (mode.toLowerCase()) {
          case 'rgba':
            return str + hxa;
          case 'argb':
            return hxa + str;
          default:
            return str;
        }
      })();
    };
  
    _input.hex = function(h) {
      return hex2rgb(h);
    };
  
    chroma.hex = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['hex']), function(){});
    };
  
    Color.prototype.hex = function(mode) {
      if (mode == null) {
        mode = 'auto';
      }
      return rgb2hex(this._rgb, mode);
    };
  
    _guess_formats.push({
      p: 4,
      test: function(n) {
        if (arguments.length === 1 && type(n) === "string") {
          return 'hex';
        }
      }
    });
  
    hsl2rgb = function() {
      var args, b, c, g, h, i, l, o, r, ref, s, t1, t2, t3;
      args = unpack(arguments);
      h = args[0], s = args[1], l = args[2];
      if (s === 0) {
        r = g = b = l * 255;
      } else {
        t3 = [0, 0, 0];
        c = [0, 0, 0];
        t2 = l < 0.5 ? l * (1 + s) : l + s - l * s;
        t1 = 2 * l - t2;
        h /= 360;
        t3[0] = h + 1 / 3;
        t3[1] = h;
        t3[2] = h - 1 / 3;
        for (i = o = 0; o <= 2; i = ++o) {
          if (t3[i] < 0) {
            t3[i] += 1;
          }
          if (t3[i] > 1) {
            t3[i] -= 1;
          }
          if (6 * t3[i] < 1) {
            c[i] = t1 + (t2 - t1) * 6 * t3[i];
          } else if (2 * t3[i] < 1) {
            c[i] = t2;
          } else if (3 * t3[i] < 2) {
            c[i] = t1 + (t2 - t1) * ((2 / 3) - t3[i]) * 6;
          } else {
            c[i] = t1;
          }
        }
        ref = [round(c[0] * 255), round(c[1] * 255), round(c[2] * 255)], r = ref[0], g = ref[1], b = ref[2];
      }
      if (args.length > 3) {
        return [r, g, b, args[3]];
      } else {
        return [r, g, b];
      }
    };
  
    rgb2hsl = function(r, g, b) {
      var h, l, min, ref, s;
      if (r !== void 0 && r.length >= 3) {
        ref = r, r = ref[0], g = ref[1], b = ref[2];
      }
      r /= 255;
      g /= 255;
      b /= 255;
      min = Math.min(r, g, b);
      max = Math.max(r, g, b);
      l = (max + min) / 2;
      if (max === min) {
        s = 0;
        h = Number.NaN;
      } else {
        s = l < 0.5 ? (max - min) / (max + min) : (max - min) / (2 - max - min);
      }
      if (r === max) {
        h = (g - b) / (max - min);
      } else if (g === max) {
        h = 2 + (b - r) / (max - min);
      } else if (b === max) {
        h = 4 + (r - g) / (max - min);
      }
      h *= 60;
      if (h < 0) {
        h += 360;
      }
      return [h, s, l];
    };
  
    chroma.hsl = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['hsl']), function(){});
    };
  
    _input.hsl = hsl2rgb;
  
    Color.prototype.hsl = function() {
      return rgb2hsl(this._rgb);
    };
  
    hsv2rgb = function() {
      var args, b, f, g, h, i, p, q, r, ref, ref1, ref2, ref3, ref4, ref5, s, t, v;
      args = unpack(arguments);
      h = args[0], s = args[1], v = args[2];
      v *= 255;
      if (s === 0) {
        r = g = b = v;
      } else {
        if (h === 360) {
          h = 0;
        }
        if (h > 360) {
          h -= 360;
        }
        if (h < 0) {
          h += 360;
        }
        h /= 60;
        i = floor(h);
        f = h - i;
        p = v * (1 - s);
        q = v * (1 - s * f);
        t = v * (1 - s * (1 - f));
        switch (i) {
          case 0:
            ref = [v, t, p], r = ref[0], g = ref[1], b = ref[2];
            break;
          case 1:
            ref1 = [q, v, p], r = ref1[0], g = ref1[1], b = ref1[2];
            break;
          case 2:
            ref2 = [p, v, t], r = ref2[0], g = ref2[1], b = ref2[2];
            break;
          case 3:
            ref3 = [p, q, v], r = ref3[0], g = ref3[1], b = ref3[2];
            break;
          case 4:
            ref4 = [t, p, v], r = ref4[0], g = ref4[1], b = ref4[2];
            break;
          case 5:
            ref5 = [v, p, q], r = ref5[0], g = ref5[1], b = ref5[2];
        }
      }
      return [r, g, b, args.length > 3 ? args[3] : 1];
    };
  
    rgb2hsv = function() {
      var b, delta, g, h, min, r, ref, s, v;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      min = Math.min(r, g, b);
      max = Math.max(r, g, b);
      delta = max - min;
      v = max / 255.0;
      if (max === 0) {
        h = Number.NaN;
        s = 0;
      } else {
        s = delta / max;
        if (r === max) {
          h = (g - b) / delta;
        }
        if (g === max) {
          h = 2 + (b - r) / delta;
        }
        if (b === max) {
          h = 4 + (r - g) / delta;
        }
        h *= 60;
        if (h < 0) {
          h += 360;
        }
      }
      return [h, s, v];
    };
  
    chroma.hsv = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['hsv']), function(){});
    };
  
    _input.hsv = hsv2rgb;
  
    Color.prototype.hsv = function() {
      return rgb2hsv(this._rgb);
    };
  
    num2rgb = function(num) {
      var b, g, r;
      if (type(num) === "number" && num >= 0 && num <= 0xFFFFFF) {
        r = num >> 16;
        g = (num >> 8) & 0xFF;
        b = num & 0xFF;
        return [r, g, b, 1];
      }
      console.warn("unknown num color: " + num);
      return [0, 0, 0, 1];
    };
  
    rgb2num = function() {
      var b, g, r, ref;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      return (r << 16) + (g << 8) + b;
    };
  
    chroma.num = function(num) {
      return new Color(num, 'num');
    };
  
    Color.prototype.num = function(mode) {
      if (mode == null) {
        mode = 'rgb';
      }
      return rgb2num(this._rgb, mode);
    };
  
    _input.num = num2rgb;
  
    _guess_formats.push({
      p: 1,
      test: function(n) {
        if (arguments.length === 1 && type(n) === "number" && n >= 0 && n <= 0xFFFFFF) {
          return 'num';
        }
      }
    });
  
    hcg2rgb = function() {
      var _c, _g, args, b, c, f, g, h, i, p, q, r, ref, ref1, ref2, ref3, ref4, ref5, t, v;
      args = unpack(arguments);
      h = args[0], c = args[1], _g = args[2];
      c = c / 100;
      g = g / 100 * 255;
      _c = c * 255;
      if (c === 0) {
        r = g = b = _g;
      } else {
        if (h === 360) {
          h = 0;
        }
        if (h > 360) {
          h -= 360;
        }
        if (h < 0) {
          h += 360;
        }
        h /= 60;
        i = floor(h);
        f = h - i;
        p = _g * (1 - c);
        q = p + _c * (1 - f);
        t = p + _c * f;
        v = p + _c;
        switch (i) {
          case 0:
            ref = [v, t, p], r = ref[0], g = ref[1], b = ref[2];
            break;
          case 1:
            ref1 = [q, v, p], r = ref1[0], g = ref1[1], b = ref1[2];
            break;
          case 2:
            ref2 = [p, v, t], r = ref2[0], g = ref2[1], b = ref2[2];
            break;
          case 3:
            ref3 = [p, q, v], r = ref3[0], g = ref3[1], b = ref3[2];
            break;
          case 4:
            ref4 = [t, p, v], r = ref4[0], g = ref4[1], b = ref4[2];
            break;
          case 5:
            ref5 = [v, p, q], r = ref5[0], g = ref5[1], b = ref5[2];
        }
      }
      return [r, g, b, args.length > 3 ? args[3] : 1];
    };
  
    rgb2hcg = function() {
      var _g, b, c, delta, g, h, min, r, ref;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      min = Math.min(r, g, b);
      max = Math.max(r, g, b);
      delta = max - min;
      c = delta * 100 / 255;
      _g = min / (255 - delta) * 100;
      if (delta === 0) {
        h = Number.NaN;
      } else {
        if (r === max) {
          h = (g - b) / delta;
        }
        if (g === max) {
          h = 2 + (b - r) / delta;
        }
        if (b === max) {
          h = 4 + (r - g) / delta;
        }
        h *= 60;
        if (h < 0) {
          h += 360;
        }
      }
      return [h, c, _g];
    };
  
    chroma.hcg = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['hcg']), function(){});
    };
  
    _input.hcg = hcg2rgb;
  
    Color.prototype.hcg = function() {
      return rgb2hcg(this._rgb);
    };
  
    css2rgb = function(css) {
      var aa, ab, hsl, i, m, o, rgb, w;
      css = css.toLowerCase();
      if ((chroma.colors != null) && chroma.colors[css]) {
        return hex2rgb(chroma.colors[css]);
      }
      if (m = css.match(/rgb\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*\)/)) {
        rgb = m.slice(1, 4);
        for (i = o = 0; o <= 2; i = ++o) {
          rgb[i] = +rgb[i];
        }
        rgb[3] = 1;
      } else if (m = css.match(/rgba\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*,\s*([01]|[01]?\.\d+)\)/)) {
        rgb = m.slice(1, 5);
        for (i = w = 0; w <= 3; i = ++w) {
          rgb[i] = +rgb[i];
        }
      } else if (m = css.match(/rgb\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)) {
        rgb = m.slice(1, 4);
        for (i = aa = 0; aa <= 2; i = ++aa) {
          rgb[i] = round(rgb[i] * 2.55);
        }
        rgb[3] = 1;
      } else if (m = css.match(/rgba\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)) {
        rgb = m.slice(1, 5);
        for (i = ab = 0; ab <= 2; i = ++ab) {
          rgb[i] = round(rgb[i] * 2.55);
        }
        rgb[3] = +rgb[3];
      } else if (m = css.match(/hsl\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)) {
        hsl = m.slice(1, 4);
        hsl[1] *= 0.01;
        hsl[2] *= 0.01;
        rgb = hsl2rgb(hsl);
        rgb[3] = 1;
      } else if (m = css.match(/hsla\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)) {
        hsl = m.slice(1, 4);
        hsl[1] *= 0.01;
        hsl[2] *= 0.01;
        rgb = hsl2rgb(hsl);
        rgb[3] = +m[4];
      }
      return rgb;
    };
  
    rgb2css = function(rgba) {
      var mode;
      mode = rgba[3] < 1 ? 'rgba' : 'rgb';
      if (mode === 'rgb') {
        return mode + '(' + rgba.slice(0, 3).map(round).join(',') + ')';
      } else if (mode === 'rgba') {
        return mode + '(' + rgba.slice(0, 3).map(round).join(',') + ',' + rgba[3] + ')';
      } else {
  
      }
    };
  
    rnd = function(a) {
      return round(a * 100) / 100;
    };
  
    hsl2css = function(hsl, alpha) {
      var mode;
      mode = alpha < 1 ? 'hsla' : 'hsl';
      hsl[0] = rnd(hsl[0] || 0);
      hsl[1] = rnd(hsl[1] * 100) + '%';
      hsl[2] = rnd(hsl[2] * 100) + '%';
      if (mode === 'hsla') {
        hsl[3] = alpha;
      }
      return mode + '(' + hsl.join(',') + ')';
    };
  
    _input.css = function(h) {
      return css2rgb(h);
    };
  
    chroma.css = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['css']), function(){});
    };
  
    Color.prototype.css = function(mode) {
      if (mode == null) {
        mode = 'rgb';
      }
      if (mode.slice(0, 3) === 'rgb') {
        return rgb2css(this._rgb);
      } else if (mode.slice(0, 3) === 'hsl') {
        return hsl2css(this.hsl(), this.alpha());
      }
    };
  
    _input.named = function(name) {
      return hex2rgb(w3cx11[name]);
    };
  
    _guess_formats.push({
      p: 5,
      test: function(n) {
        if (arguments.length === 1 && (w3cx11[n] != null)) {
          return 'named';
        }
      }
    });
  
    Color.prototype.name = function(n) {
      var h, k;
      if (arguments.length) {
        if (w3cx11[n]) {
          this._rgb = hex2rgb(w3cx11[n]);
        }
        this._rgb[3] = 1;
        this;
      }
      h = this.hex('rgb');
      for (k in w3cx11) {
        if (h === w3cx11[k]) {
          return k;
        }
      }
      return h;
    };
  
    lch2lab = function() {
  
      /*
      Convert from a qualitative parameter h and a quantitative parameter l to a 24-bit pixel.
      These formulas were invented by David Dalrymple to obtain maximum contrast without going
      out of gamut if the parameters are in the range 0-1.
      
      A saturation multiplier was added by Gregor Aisch
       */
      var c, h, l, ref;
      ref = unpack(arguments), l = ref[0], c = ref[1], h = ref[2];
      h = h * DEG2RAD;
      return [l, cos(h) * c, sin(h) * c];
    };
  
    lch2rgb = function() {
      var L, a, args, b, c, g, h, l, r, ref, ref1;
      args = unpack(arguments);
      l = args[0], c = args[1], h = args[2];
      ref = lch2lab(l, c, h), L = ref[0], a = ref[1], b = ref[2];
      ref1 = lab2rgb(L, a, b), r = ref1[0], g = ref1[1], b = ref1[2];
      return [r, g, b, args.length > 3 ? args[3] : 1];
    };
  
    lab2lch = function() {
      var a, b, c, h, l, ref;
      ref = unpack(arguments), l = ref[0], a = ref[1], b = ref[2];
      c = sqrt(a * a + b * b);
      h = (atan2(b, a) * RAD2DEG + 360) % 360;
      if (round(c * 10000) === 0) {
        h = Number.NaN;
      }
      return [l, c, h];
    };
  
    rgb2lch = function() {
      var a, b, g, l, r, ref, ref1;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      ref1 = rgb2lab(r, g, b), l = ref1[0], a = ref1[1], b = ref1[2];
      return lab2lch(l, a, b);
    };
  
    chroma.lch = function() {
      var args;
      args = unpack(arguments);
      return new Color(args, 'lch');
    };
  
    chroma.hcl = function() {
      var args;
      args = unpack(arguments);
      return new Color(args, 'hcl');
    };
  
    _input.lch = lch2rgb;
  
    _input.hcl = function() {
      var c, h, l, ref;
      ref = unpack(arguments), h = ref[0], c = ref[1], l = ref[2];
      return lch2rgb([l, c, h]);
    };
  
    Color.prototype.lch = function() {
      return rgb2lch(this._rgb);
    };
  
    Color.prototype.hcl = function() {
      return rgb2lch(this._rgb).reverse();
    };
  
    rgb2cmyk = function(mode) {
      var b, c, f, g, k, m, r, ref, y;
      if (mode == null) {
        mode = 'rgb';
      }
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      r = r / 255;
      g = g / 255;
      b = b / 255;
      k = 1 - Math.max(r, Math.max(g, b));
      f = k < 1 ? 1 / (1 - k) : 0;
      c = (1 - r - k) * f;
      m = (1 - g - k) * f;
      y = (1 - b - k) * f;
      return [c, m, y, k];
    };
  
    cmyk2rgb = function() {
      var alpha, args, b, c, g, k, m, r, y;
      args = unpack(arguments);
      c = args[0], m = args[1], y = args[2], k = args[3];
      alpha = args.length > 4 ? args[4] : 1;
      if (k === 1) {
        return [0, 0, 0, alpha];
      }
      r = c >= 1 ? 0 : 255 * (1 - c) * (1 - k);
      g = m >= 1 ? 0 : 255 * (1 - m) * (1 - k);
      b = y >= 1 ? 0 : 255 * (1 - y) * (1 - k);
      return [r, g, b, alpha];
    };
  
    _input.cmyk = function() {
      return cmyk2rgb(unpack(arguments));
    };
  
    chroma.cmyk = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['cmyk']), function(){});
    };
  
    Color.prototype.cmyk = function() {
      return rgb2cmyk(this._rgb);
    };
  
    _input.gl = function() {
      var i, k, o, rgb, v;
      rgb = (function() {
        var ref, results;
        ref = unpack(arguments);
        results = [];
        for (k in ref) {
          v = ref[k];
          results.push(v);
        }
        return results;
      }).apply(this, arguments);
      for (i = o = 0; o <= 2; i = ++o) {
        rgb[i] *= 255;
      }
      return rgb;
    };
  
    chroma.gl = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['gl']), function(){});
    };
  
    Color.prototype.gl = function() {
      var rgb;
      rgb = this._rgb;
      return [rgb[0] / 255, rgb[1] / 255, rgb[2] / 255, rgb[3]];
    };
  
    rgb2luminance = function(r, g, b) {
      var ref;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      r = luminance_x(r);
      g = luminance_x(g);
      b = luminance_x(b);
      return 0.2126 * r + 0.7152 * g + 0.0722 * b;
    };
  
    luminance_x = function(x) {
      x /= 255;
      if (x <= 0.03928) {
        return x / 12.92;
      } else {
        return pow((x + 0.055) / 1.055, 2.4);
      }
    };
  
    interpolate_rgb = function(col1, col2, f, m) {
      var xyz0, xyz1;
      xyz0 = col1._rgb;
      xyz1 = col2._rgb;
      return new Color(xyz0[0] + f * (xyz1[0] - xyz0[0]), xyz0[1] + f * (xyz1[1] - xyz0[1]), xyz0[2] + f * (xyz1[2] - xyz0[2]), m);
    };
  
    _interpolators.push(['rgb', interpolate_rgb]);
  
    Color.prototype.luminance = function(lum, mode) {
      var cur_lum, eps, max_iter, rgba, test;
      if (mode == null) {
        mode = 'rgb';
      }
      if (!arguments.length) {
        return rgb2luminance(this._rgb);
      }
      rgba = this._rgb;
      if (lum === 0) {
        rgba = [0, 0, 0, this._rgb[3]];
      } else if (lum === 1) {
        rgba = [255, 255, 255, this[3]];
      } else {
        cur_lum = rgb2luminance(this._rgb);
        eps = 1e-7;
        max_iter = 20;
        test = function(l, h) {
          var lm, m;
          m = l.interpolate(h, 0.5, mode);
          lm = m.luminance();
          if (Math.abs(lum - lm) < eps || !max_iter--) {
            return m;
          }
          if (lm > lum) {
            return test(l, m);
          }
          return test(m, h);
        };
        if (cur_lum > lum) {
          rgba = test(chroma('black'), this).rgba();
        } else {
          rgba = test(this, chroma('white')).rgba();
        }
      }
      return chroma(rgba).alpha(this.alpha());
    };
  
    temperature2rgb = function(kelvin) {
      var b, g, r, temp;
      temp = kelvin / 100;
      if (temp < 66) {
        r = 255;
        g = -155.25485562709179 - 0.44596950469579133 * (g = temp - 2) + 104.49216199393888 * log(g);
        b = temp < 20 ? 0 : -254.76935184120902 + 0.8274096064007395 * (b = temp - 10) + 115.67994401066147 * log(b);
      } else {
        r = 351.97690566805693 + 0.114206453784165 * (r = temp - 55) - 40.25366309332127 * log(r);
        g = 325.4494125711974 + 0.07943456536662342 * (g = temp - 50) - 28.0852963507957 * log(g);
        b = 255;
      }
      return [r, g, b];
    };
  
    rgb2temperature = function() {
      var b, eps, g, maxTemp, minTemp, r, ref, rgb, temp;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      minTemp = 1000;
      maxTemp = 40000;
      eps = 0.4;
      while (maxTemp - minTemp > eps) {
        temp = (maxTemp + minTemp) * 0.5;
        rgb = temperature2rgb(temp);
        if ((rgb[2] / rgb[0]) >= (b / r)) {
          maxTemp = temp;
        } else {
          minTemp = temp;
        }
      }
      return round(temp);
    };
  
    chroma.temperature = chroma.kelvin = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['temperature']), function(){});
    };
  
    _input.temperature = _input.kelvin = _input.K = temperature2rgb;
  
    Color.prototype.temperature = function() {
      return rgb2temperature(this._rgb);
    };
  
    Color.prototype.kelvin = Color.prototype.temperature;
  
    chroma.contrast = function(a, b) {
      var l1, l2, ref, ref1;
      if ((ref = type(a)) === 'string' || ref === 'number') {
        a = new Color(a);
      }
      if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
        b = new Color(b);
      }
      l1 = a.luminance();
      l2 = b.luminance();
      if (l1 > l2) {
        return (l1 + 0.05) / (l2 + 0.05);
      } else {
        return (l2 + 0.05) / (l1 + 0.05);
      }
    };
  
    chroma.distance = function(a, b, mode) {
      var d, i, l1, l2, ref, ref1, sum_sq;
      if (mode == null) {
        mode = 'lab';
      }
      if ((ref = type(a)) === 'string' || ref === 'number') {
        a = new Color(a);
      }
      if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
        b = new Color(b);
      }
      l1 = a.get(mode);
      l2 = b.get(mode);
      sum_sq = 0;
      for (i in l1) {
        d = (l1[i] || 0) - (l2[i] || 0);
        sum_sq += d * d;
      }
      return Math.sqrt(sum_sq);
    };
  
    chroma.deltaE = function(a, b, L, C) {
      var L1, L2, a1, a2, b1, b2, c1, c2, c4, dH2, delA, delB, delC, delL, f, h1, ref, ref1, ref2, ref3, sc, sh, sl, t, v1, v2, v3;
      if (L == null) {
        L = 1;
      }
      if (C == null) {
        C = 1;
      }
      if ((ref = type(a)) === 'string' || ref === 'number') {
        a = new Color(a);
      }
      if ((ref1 = type(b)) === 'string' || ref1 === 'number') {
        b = new Color(b);
      }
      ref2 = a.lab(), L1 = ref2[0], a1 = ref2[1], b1 = ref2[2];
      ref3 = b.lab(), L2 = ref3[0], a2 = ref3[1], b2 = ref3[2];
      c1 = sqrt(a1 * a1 + b1 * b1);
      c2 = sqrt(a2 * a2 + b2 * b2);
      sl = L1 < 16.0 ? 0.511 : (0.040975 * L1) / (1.0 + 0.01765 * L1);
      sc = (0.0638 * c1) / (1.0 + 0.0131 * c1) + 0.638;
      h1 = c1 < 0.000001 ? 0.0 : (atan2(b1, a1) * 180.0) / PI;
      while (h1 < 0) {
        h1 += 360;
      }
      while (h1 >= 360) {
        h1 -= 360;
      }
      t = (h1 >= 164.0) && (h1 <= 345.0) ? 0.56 + abs(0.2 * cos((PI * (h1 + 168.0)) / 180.0)) : 0.36 + abs(0.4 * cos((PI * (h1 + 35.0)) / 180.0));
      c4 = c1 * c1 * c1 * c1;
      f = sqrt(c4 / (c4 + 1900.0));
      sh = sc * (f * t + 1.0 - f);
      delL = L1 - L2;
      delC = c1 - c2;
      delA = a1 - a2;
      delB = b1 - b2;
      dH2 = delA * delA + delB * delB - delC * delC;
      v1 = delL / (L * sl);
      v2 = delC / (C * sc);
      v3 = sh;
      return sqrt(v1 * v1 + v2 * v2 + (dH2 / (v3 * v3)));
    };
  
    Color.prototype.get = function(modechan) {
      var channel, i, me, mode, ref, src;
      me = this;
      ref = modechan.split('.'), mode = ref[0], channel = ref[1];
      src = me[mode]();
      if (channel) {
        i = mode.indexOf(channel);
        if (i > -1) {
          return src[i];
        } else {
          return console.warn('unknown channel ' + channel + ' in mode ' + mode);
        }
      } else {
        return src;
      }
    };
  
    Color.prototype.set = function(modechan, value) {
      var channel, i, me, mode, ref, src;
      me = this;
      ref = modechan.split('.'), mode = ref[0], channel = ref[1];
      if (channel) {
        src = me[mode]();
        i = mode.indexOf(channel);
        if (i > -1) {
          if (type(value) === 'string') {
            switch (value.charAt(0)) {
              case '+':
                src[i] += +value;
                break;
              case '-':
                src[i] += +value;
                break;
              case '*':
                src[i] *= +(value.substr(1));
                break;
              case '/':
                src[i] /= +(value.substr(1));
                break;
              default:
                src[i] = +value;
            }
          } else {
            src[i] = value;
          }
        } else {
          console.warn('unknown channel ' + channel + ' in mode ' + mode);
        }
      } else {
        src = value;
      }
      return chroma(src, mode).alpha(me.alpha());
    };
  
    Color.prototype.clipped = function() {
      return this._rgb._clipped || false;
    };
  
    Color.prototype.alpha = function(a) {
      if (arguments.length) {
        return chroma.rgb([this._rgb[0], this._rgb[1], this._rgb[2], a]);
      }
      return this._rgb[3];
    };
  
    Color.prototype.darken = function(amount) {
      var lab, me;
      if (amount == null) {
        amount = 1;
      }
      me = this;
      lab = me.lab();
      lab[0] -= LAB_CONSTANTS.Kn * amount;
      return chroma.lab(lab).alpha(me.alpha());
    };
  
    Color.prototype.brighten = function(amount) {
      if (amount == null) {
        amount = 1;
      }
      return this.darken(-amount);
    };
  
    Color.prototype.darker = Color.prototype.darken;
  
    Color.prototype.brighter = Color.prototype.brighten;
  
    Color.prototype.saturate = function(amount) {
      var lch, me;
      if (amount == null) {
        amount = 1;
      }
      me = this;
      lch = me.lch();
      lch[1] += amount * LAB_CONSTANTS.Kn;
      if (lch[1] < 0) {
        lch[1] = 0;
      }
      return chroma.lch(lch).alpha(me.alpha());
    };
  
    Color.prototype.desaturate = function(amount) {
      if (amount == null) {
        amount = 1;
      }
      return this.saturate(-amount);
    };
  
    Color.prototype.premultiply = function() {
      var a, rgb;
      rgb = this.rgb();
      a = this.alpha();
      return chroma(rgb[0] * a, rgb[1] * a, rgb[2] * a, a);
    };
  
    blend = function(bottom, top, mode) {
      if (!blend[mode]) {
        throw 'unknown blend mode ' + mode;
      }
      return blend[mode](bottom, top);
    };
  
    blend_f = function(f) {
      return function(bottom, top) {
        var c0, c1;
        c0 = chroma(top).rgb();
        c1 = chroma(bottom).rgb();
        return chroma(f(c0, c1), 'rgb');
      };
    };
  
    each = function(f) {
      return function(c0, c1) {
        var i, o, out;
        out = [];
        for (i = o = 0; o <= 3; i = ++o) {
          out[i] = f(c0[i], c1[i]);
        }
        return out;
      };
    };
  
    normal = function(a, b) {
      return a;
    };
  
    multiply = function(a, b) {
      return a * b / 255;
    };
  
    darken = function(a, b) {
      if (a > b) {
        return b;
      } else {
        return a;
      }
    };
  
    lighten = function(a, b) {
      if (a > b) {
        return a;
      } else {
        return b;
      }
    };
  
    screen = function(a, b) {
      return 255 * (1 - (1 - a / 255) * (1 - b / 255));
    };
  
    overlay = function(a, b) {
      if (b < 128) {
        return 2 * a * b / 255;
      } else {
        return 255 * (1 - 2 * (1 - a / 255) * (1 - b / 255));
      }
    };
  
    burn = function(a, b) {
      return 255 * (1 - (1 - b / 255) / (a / 255));
    };
  
    dodge = function(a, b) {
      if (a === 255) {
        return 255;
      }
      a = 255 * (b / 255) / (1 - a / 255);
      if (a > 255) {
        return 255;
      } else {
        return a;
      }
    };
  
    blend.normal = blend_f(each(normal));
  
    blend.multiply = blend_f(each(multiply));
  
    blend.screen = blend_f(each(screen));
  
    blend.overlay = blend_f(each(overlay));
  
    blend.darken = blend_f(each(darken));
  
    blend.lighten = blend_f(each(lighten));
  
    blend.dodge = blend_f(each(dodge));
  
    blend.burn = blend_f(each(burn));
  
    chroma.blend = blend;
  
    chroma.analyze = function(data) {
      var len, o, r, val;
      r = {
        min: Number.MAX_VALUE,
        max: Number.MAX_VALUE * -1,
        sum: 0,
        values: [],
        count: 0
      };
      for (o = 0, len = data.length; o < len; o++) {
        val = data[o];
        if ((val != null) && !isNaN(val)) {
          r.values.push(val);
          r.sum += val;
          if (val < r.min) {
            r.min = val;
          }
          if (val > r.max) {
            r.max = val;
          }
          r.count += 1;
        }
      }
      r.domain = [r.min, r.max];
      r.limits = function(mode, num) {
        return chroma.limits(r, mode, num);
      };
      return r;
    };
  
    chroma.scale = function(colors, positions) {
      var _classes, _colorCache, _colors, _correctLightness, _domain, _fixed, _gamma, _max, _min, _mode, _nacol, _out, _padding, _pos, _spread, _useCache, classifyValue, f, getClass, getColor, resetCache, setColors, tmap;
      _mode = 'rgb';
      _nacol = chroma('#ccc');
      _spread = 0;
      _fixed = false;
      _domain = [0, 1];
      _pos = [];
      _padding = [0, 0];
      _classes = false;
      _colors = [];
      _out = false;
      _min = 0;
      _max = 1;
      _correctLightness = false;
      _colorCache = {};
      _useCache = true;
      _gamma = 1;
      setColors = function(colors) {
        var c, col, o, ref, ref1, w;
        if (colors == null) {
          colors = ['#fff', '#000'];
        }
        if ((colors != null) && type(colors) === 'string' && (chroma.brewer != null)) {
          colors = chroma.brewer[colors] || chroma.brewer[colors.toLowerCase()] || colors;
        }
        if (type(colors) === 'array') {
          if (colors.length === 1) {
            colors = [colors[0], colors[0]];
          }
          colors = colors.slice(0);
          for (c = o = 0, ref = colors.length - 1; 0 <= ref ? o <= ref : o >= ref; c = 0 <= ref ? ++o : --o) {
            col = colors[c];
            if (type(col) === "string") {
              colors[c] = chroma(col);
            }
          }
          _pos.length = 0;
          for (c = w = 0, ref1 = colors.length - 1; 0 <= ref1 ? w <= ref1 : w >= ref1; c = 0 <= ref1 ? ++w : --w) {
            _pos.push(c / (colors.length - 1));
          }
        }
        resetCache();
        return _colors = colors;
      };
      getClass = function(value) {
        var i, n;
        if (_classes != null) {
          n = _classes.length - 1;
          i = 0;
          while (i < n && value >= _classes[i]) {
            i++;
          }
          return i - 1;
        }
        return 0;
      };
      tmap = function(t) {
        return t;
      };
      classifyValue = function(value) {
        var i, maxc, minc, n, val;
        val = value;
        if (_classes.length > 2) {
          n = _classes.length - 1;
          i = getClass(value);
          minc = _classes[0] + (_classes[1] - _classes[0]) * (0 + _spread * 0.5);
          maxc = _classes[n - 1] + (_classes[n] - _classes[n - 1]) * (1 - _spread * 0.5);
          val = _min + ((_classes[i] + (_classes[i + 1] - _classes[i]) * 0.5 - minc) / (maxc - minc)) * (_max - _min);
        }
        return val;
      };
      getColor = function(val, bypassMap) {
        var c, col, i, k, o, p, ref, t;
        if (bypassMap == null) {
          bypassMap = false;
        }
        if (isNaN(val) || val === null) {
          return _nacol;
        }
        if (!bypassMap) {
          if (_classes && _classes.length > 2) {
            c = getClass(val);
            t = c / (_classes.length - 2);
          } else if (_max !== _min) {
            t = (val - _min) / (_max - _min);
          } else {
            t = 1;
          }
        } else {
          t = val;
        }
        if (!bypassMap) {
          t = tmap(t);
        }
        if (_gamma !== 1) {
          t = pow(t, _gamma);
        }
        t = _padding[0] + (t * (1 - _padding[0] - _padding[1]));
        t = Math.min(1, Math.max(0, t));
        k = Math.floor(t * 10000);
        if (_useCache && _colorCache[k]) {
          col = _colorCache[k];
        } else {
          if (type(_colors) === 'array') {
            for (i = o = 0, ref = _pos.length - 1; 0 <= ref ? o <= ref : o >= ref; i = 0 <= ref ? ++o : --o) {
              p = _pos[i];
              if (t <= p) {
                col = _colors[i];
                break;
              }
              if (t >= p && i === _pos.length - 1) {
                col = _colors[i];
                break;
              }
              if (t > p && t < _pos[i + 1]) {
                t = (t - p) / (_pos[i + 1] - p);
                col = chroma.interpolate(_colors[i], _colors[i + 1], t, _mode);
                break;
              }
            }
          } else if (type(_colors) === 'function') {
            col = _colors(t);
          }
          if (_useCache) {
            _colorCache[k] = col;
          }
        }
        return col;
      };
      resetCache = function() {
        return _colorCache = {};
      };
      setColors(colors);
      f = function(v) {
        var c;
        c = chroma(getColor(v));
        if (_out && c[_out]) {
          return c[_out]();
        } else {
          return c;
        }
      };
      f.classes = function(classes) {
        var d;
        if (classes != null) {
          if (type(classes) === 'array') {
            _classes = classes;
            _domain = [classes[0], classes[classes.length - 1]];
          } else {
            d = chroma.analyze(_domain);
            if (classes === 0) {
              _classes = [d.min, d.max];
            } else {
              _classes = chroma.limits(d, 'e', classes);
            }
          }
          return f;
        }
        return _classes;
      };
      f.domain = function(domain) {
        var c, d, k, len, o, ref, w;
        if (!arguments.length) {
          return _domain;
        }
        _min = domain[0];
        _max = domain[domain.length - 1];
        _pos = [];
        k = _colors.length;
        if (domain.length === k && _min !== _max) {
          for (o = 0, len = domain.length; o < len; o++) {
            d = domain[o];
            _pos.push((d - _min) / (_max - _min));
          }
        } else {
          for (c = w = 0, ref = k - 1; 0 <= ref ? w <= ref : w >= ref; c = 0 <= ref ? ++w : --w) {
            _pos.push(c / (k - 1));
          }
        }
        _domain = [_min, _max];
        return f;
      };
      f.mode = function(_m) {
        if (!arguments.length) {
          return _mode;
        }
        _mode = _m;
        resetCache();
        return f;
      };
      f.range = function(colors, _pos) {
        setColors(colors, _pos);
        return f;
      };
      f.out = function(_o) {
        _out = _o;
        return f;
      };
      f.spread = function(val) {
        if (!arguments.length) {
          return _spread;
        }
        _spread = val;
        return f;
      };
      f.correctLightness = function(v) {
        if (v == null) {
          v = true;
        }
        _correctLightness = v;
        resetCache();
        if (_correctLightness) {
          tmap = function(t) {
            var L0, L1, L_actual, L_diff, L_ideal, max_iter, pol, t0, t1;
            L0 = getColor(0, true).lab()[0];
            L1 = getColor(1, true).lab()[0];
            pol = L0 > L1;
            L_actual = getColor(t, true).lab()[0];
            L_ideal = L0 + (L1 - L0) * t;
            L_diff = L_actual - L_ideal;
            t0 = 0;
            t1 = 1;
            max_iter = 20;
            while (Math.abs(L_diff) > 1e-2 && max_iter-- > 0) {
              (function() {
                if (pol) {
                  L_diff *= -1;
                }
                if (L_diff < 0) {
                  t0 = t;
                  t += (t1 - t) * 0.5;
                } else {
                  t1 = t;
                  t += (t0 - t) * 0.5;
                }
                L_actual = getColor(t, true).lab()[0];
                return L_diff = L_actual - L_ideal;
              })();
            }
            return t;
          };
        } else {
          tmap = function(t) {
            return t;
          };
        }
        return f;
      };
      f.padding = function(p) {
        if (p != null) {
          if (type(p) === 'number') {
            p = [p, p];
          }
          _padding = p;
          return f;
        } else {
          return _padding;
        }
      };
      f.colors = function(numColors, out) {
        var dd, dm, i, o, ref, result, results, samples, w;
        if (arguments.length < 2) {
          out = 'hex';
        }
        result = [];
        if (arguments.length === 0) {
          result = _colors.slice(0);
        } else if (numColors === 1) {
          result = [f(0.5)];
        } else if (numColors > 1) {
          dm = _domain[0];
          dd = _domain[1] - dm;
          result = (function() {
            results = [];
            for (var o = 0; 0 <= numColors ? o < numColors : o > numColors; 0 <= numColors ? o++ : o--){ results.push(o); }
            return results;
          }).apply(this).map(function(i) {
            return f(dm + i / (numColors - 1) * dd);
          });
        } else {
          colors = [];
          samples = [];
          if (_classes && _classes.length > 2) {
            for (i = w = 1, ref = _classes.length; 1 <= ref ? w < ref : w > ref; i = 1 <= ref ? ++w : --w) {
              samples.push((_classes[i - 1] + _classes[i]) * 0.5);
            }
          } else {
            samples = _domain;
          }
          result = samples.map(function(v) {
            return f(v);
          });
        }
        if (chroma[out]) {
          result = result.map(function(c) {
            return c[out]();
          });
        }
        return result;
      };
      f.cache = function(c) {
        if (c != null) {
          _useCache = c;
          return f;
        } else {
          return _useCache;
        }
      };
      f.gamma = function(g) {
        if (g != null) {
          _gamma = g;
          return f;
        } else {
          return _gamma;
        }
      };
      f.nodata = function(d) {
        if (d != null) {
          _nacol = chroma(d);
          return f;
        } else {
          return _nacol;
        }
      };
      return f;
    };
  
    if (chroma.scales == null) {
      chroma.scales = {};
    }
  
    chroma.scales.cool = function() {
      return chroma.scale([chroma.hsl(180, 1, .9), chroma.hsl(250, .7, .4)]);
    };
  
    chroma.scales.hot = function() {
      return chroma.scale(['#000', '#f00', '#ff0', '#fff'], [0, .25, .75, 1]).mode('rgb');
    };
  
    chroma.analyze = function(data, key, filter) {
      var add, k, len, o, r, val, visit;
      r = {
        min: Number.MAX_VALUE,
        max: Number.MAX_VALUE * -1,
        sum: 0,
        values: [],
        count: 0
      };
      if (filter == null) {
        filter = function() {
          return true;
        };
      }
      add = function(val) {
        if ((val != null) && !isNaN(val)) {
          r.values.push(val);
          r.sum += val;
          if (val < r.min) {
            r.min = val;
          }
          if (val > r.max) {
            r.max = val;
          }
          r.count += 1;
        }
      };
      visit = function(val, k) {
        if (filter(val, k)) {
          if ((key != null) && type(key) === 'function') {
            return add(key(val));
          } else if ((key != null) && type(key) === 'string' || type(key) === 'number') {
            return add(val[key]);
          } else {
            return add(val);
          }
        }
      };
      if (type(data) === 'array') {
        for (o = 0, len = data.length; o < len; o++) {
          val = data[o];
          visit(val);
        }
      } else {
        for (k in data) {
          val = data[k];
          visit(val, k);
        }
      }
      r.domain = [r.min, r.max];
      r.limits = function(mode, num) {
        return chroma.limits(r, mode, num);
      };
      return r;
    };
  
    chroma.limits = function(data, mode, num) {
      var aa, ab, ac, ad, ae, af, ag, ah, ai, aj, ak, al, am, assignments, best, centroids, cluster, clusterSizes, dist, i, j, kClusters, limits, max_log, min, min_log, mindist, n, nb_iters, newCentroids, o, p, pb, pr, ref, ref1, ref10, ref11, ref12, ref13, ref14, ref2, ref3, ref4, ref5, ref6, ref7, ref8, ref9, repeat, sum, tmpKMeansBreaks, v, value, values, w;
      if (mode == null) {
        mode = 'equal';
      }
      if (num == null) {
        num = 7;
      }
      if (type(data) === 'array') {
        data = chroma.analyze(data);
      }
      min = data.min;
      max = data.max;
      sum = data.sum;
      values = data.values.sort(function(a, b) {
        return a - b;
      });
      if (num === 1) {
        return [min, max];
      }
      limits = [];
      if (mode.substr(0, 1) === 'c') {
        limits.push(min);
        limits.push(max);
      }
      if (mode.substr(0, 1) === 'e') {
        limits.push(min);
        for (i = o = 1, ref = num - 1; 1 <= ref ? o <= ref : o >= ref; i = 1 <= ref ? ++o : --o) {
          limits.push(min + (i / num) * (max - min));
        }
        limits.push(max);
      } else if (mode.substr(0, 1) === 'l') {
        if (min <= 0) {
          throw 'Logarithmic scales are only possible for values > 0';
        }
        min_log = Math.LOG10E * log(min);
        max_log = Math.LOG10E * log(max);
        limits.push(min);
        for (i = w = 1, ref1 = num - 1; 1 <= ref1 ? w <= ref1 : w >= ref1; i = 1 <= ref1 ? ++w : --w) {
          limits.push(pow(10, min_log + (i / num) * (max_log - min_log)));
        }
        limits.push(max);
      } else if (mode.substr(0, 1) === 'q') {
        limits.push(min);
        for (i = aa = 1, ref2 = num - 1; 1 <= ref2 ? aa <= ref2 : aa >= ref2; i = 1 <= ref2 ? ++aa : --aa) {
          p = (values.length - 1) * i / num;
          pb = floor(p);
          if (pb === p) {
            limits.push(values[pb]);
          } else {
            pr = p - pb;
            limits.push(values[pb] * (1 - pr) + values[pb + 1] * pr);
          }
        }
        limits.push(max);
      } else if (mode.substr(0, 1) === 'k') {
  
        /*
        implementation based on
        http://code.google.com/p/figue/source/browse/trunk/figue.js#336
        simplified for 1-d input values
         */
        n = values.length;
        assignments = new Array(n);
        clusterSizes = new Array(num);
        repeat = true;
        nb_iters = 0;
        centroids = null;
        centroids = [];
        centroids.push(min);
        for (i = ab = 1, ref3 = num - 1; 1 <= ref3 ? ab <= ref3 : ab >= ref3; i = 1 <= ref3 ? ++ab : --ab) {
          centroids.push(min + (i / num) * (max - min));
        }
        centroids.push(max);
        while (repeat) {
          for (j = ac = 0, ref4 = num - 1; 0 <= ref4 ? ac <= ref4 : ac >= ref4; j = 0 <= ref4 ? ++ac : --ac) {
            clusterSizes[j] = 0;
          }
          for (i = ad = 0, ref5 = n - 1; 0 <= ref5 ? ad <= ref5 : ad >= ref5; i = 0 <= ref5 ? ++ad : --ad) {
            value = values[i];
            mindist = Number.MAX_VALUE;
            for (j = ae = 0, ref6 = num - 1; 0 <= ref6 ? ae <= ref6 : ae >= ref6; j = 0 <= ref6 ? ++ae : --ae) {
              dist = abs(centroids[j] - value);
              if (dist < mindist) {
                mindist = dist;
                best = j;
              }
            }
            clusterSizes[best]++;
            assignments[i] = best;
          }
          newCentroids = new Array(num);
          for (j = af = 0, ref7 = num - 1; 0 <= ref7 ? af <= ref7 : af >= ref7; j = 0 <= ref7 ? ++af : --af) {
            newCentroids[j] = null;
          }
          for (i = ag = 0, ref8 = n - 1; 0 <= ref8 ? ag <= ref8 : ag >= ref8; i = 0 <= ref8 ? ++ag : --ag) {
            cluster = assignments[i];
            if (newCentroids[cluster] === null) {
              newCentroids[cluster] = values[i];
            } else {
              newCentroids[cluster] += values[i];
            }
          }
          for (j = ah = 0, ref9 = num - 1; 0 <= ref9 ? ah <= ref9 : ah >= ref9; j = 0 <= ref9 ? ++ah : --ah) {
            newCentroids[j] *= 1 / clusterSizes[j];
          }
          repeat = false;
          for (j = ai = 0, ref10 = num - 1; 0 <= ref10 ? ai <= ref10 : ai >= ref10; j = 0 <= ref10 ? ++ai : --ai) {
            if (newCentroids[j] !== centroids[i]) {
              repeat = true;
              break;
            }
          }
          centroids = newCentroids;
          nb_iters++;
          if (nb_iters > 200) {
            repeat = false;
          }
        }
        kClusters = {};
        for (j = aj = 0, ref11 = num - 1; 0 <= ref11 ? aj <= ref11 : aj >= ref11; j = 0 <= ref11 ? ++aj : --aj) {
          kClusters[j] = [];
        }
        for (i = ak = 0, ref12 = n - 1; 0 <= ref12 ? ak <= ref12 : ak >= ref12; i = 0 <= ref12 ? ++ak : --ak) {
          cluster = assignments[i];
          kClusters[cluster].push(values[i]);
        }
        tmpKMeansBreaks = [];
        for (j = al = 0, ref13 = num - 1; 0 <= ref13 ? al <= ref13 : al >= ref13; j = 0 <= ref13 ? ++al : --al) {
          tmpKMeansBreaks.push(kClusters[j][0]);
          tmpKMeansBreaks.push(kClusters[j][kClusters[j].length - 1]);
        }
        tmpKMeansBreaks = tmpKMeansBreaks.sort(function(a, b) {
          return a - b;
        });
        limits.push(tmpKMeansBreaks[0]);
        for (i = am = 1, ref14 = tmpKMeansBreaks.length - 1; am <= ref14; i = am += 2) {
          v = tmpKMeansBreaks[i];
          if (!isNaN(v) && limits.indexOf(v) === -1) {
            limits.push(v);
          }
        }
      }
      return limits;
    };
  
    hsi2rgb = function(h, s, i) {
  
      /*
      borrowed from here:
      http://hummer.stanford.edu/museinfo/doc/examples/humdrum/keyscape2/hsi2rgb.cpp
       */
      var args, b, g, r;
      args = unpack(arguments);
      h = args[0], s = args[1], i = args[2];
      if (isNaN(h)) {
        h = 0;
      }
      h /= 360;
      if (h < 1 / 3) {
        b = (1 - s) / 3;
        r = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
        g = 1 - (b + r);
      } else if (h < 2 / 3) {
        h -= 1 / 3;
        r = (1 - s) / 3;
        g = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
        b = 1 - (r + g);
      } else {
        h -= 2 / 3;
        g = (1 - s) / 3;
        b = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
        r = 1 - (g + b);
      }
      r = limit(i * r * 3);
      g = limit(i * g * 3);
      b = limit(i * b * 3);
      return [r * 255, g * 255, b * 255, args.length > 3 ? args[3] : 1];
    };
  
    rgb2hsi = function() {
  
      /*
      borrowed from here:
      http://hummer.stanford.edu/museinfo/doc/examples/humdrum/keyscape2/rgb2hsi.cpp
       */
      var b, g, h, i, min, r, ref, s;
      ref = unpack(arguments), r = ref[0], g = ref[1], b = ref[2];
      TWOPI = Math.PI * 2;
      r /= 255;
      g /= 255;
      b /= 255;
      min = Math.min(r, g, b);
      i = (r + g + b) / 3;
      s = 1 - min / i;
      if (s === 0) {
        h = 0;
      } else {
        h = ((r - g) + (r - b)) / 2;
        h /= Math.sqrt((r - g) * (r - g) + (r - b) * (g - b));
        h = Math.acos(h);
        if (b > g) {
          h = TWOPI - h;
        }
        h /= TWOPI;
      }
      return [h * 360, s, i];
    };
  
    chroma.hsi = function() {
      return (function(func, args, ctor) {
        ctor.prototype = func.prototype;
        var child = new ctor, result = func.apply(child, args);
        return Object(result) === result ? result : child;
      })(Color, slice.call(arguments).concat(['hsi']), function(){});
    };
  
    _input.hsi = hsi2rgb;
  
    Color.prototype.hsi = function() {
      return rgb2hsi(this._rgb);
    };
  
    interpolate_hsx = function(col1, col2, f, m) {
      var dh, hue, hue0, hue1, lbv, lbv0, lbv1, res, sat, sat0, sat1, xyz0, xyz1;
      if (m === 'hsl') {
        xyz0 = col1.hsl();
        xyz1 = col2.hsl();
      } else if (m === 'hsv') {
        xyz0 = col1.hsv();
        xyz1 = col2.hsv();
      } else if (m === 'hcg') {
        xyz0 = col1.hcg();
        xyz1 = col2.hcg();
      } else if (m === 'hsi') {
        xyz0 = col1.hsi();
        xyz1 = col2.hsi();
      } else if (m === 'lch' || m === 'hcl') {
        m = 'hcl';
        xyz0 = col1.hcl();
        xyz1 = col2.hcl();
      }
      if (m.substr(0, 1) === 'h') {
        hue0 = xyz0[0], sat0 = xyz0[1], lbv0 = xyz0[2];
        hue1 = xyz1[0], sat1 = xyz1[1], lbv1 = xyz1[2];
      }
      if (!isNaN(hue0) && !isNaN(hue1)) {
        if (hue1 > hue0 && hue1 - hue0 > 180) {
          dh = hue1 - (hue0 + 360);
        } else if (hue1 < hue0 && hue0 - hue1 > 180) {
          dh = hue1 + 360 - hue0;
        } else {
          dh = hue1 - hue0;
        }
        hue = hue0 + f * dh;
      } else if (!isNaN(hue0)) {
        hue = hue0;
        if ((lbv1 === 1 || lbv1 === 0) && m !== 'hsv') {
          sat = sat0;
        }
      } else if (!isNaN(hue1)) {
        hue = hue1;
        if ((lbv0 === 1 || lbv0 === 0) && m !== 'hsv') {
          sat = sat1;
        }
      } else {
        hue = Number.NaN;
      }
      if (sat == null) {
        sat = sat0 + f * (sat1 - sat0);
      }
      lbv = lbv0 + f * (lbv1 - lbv0);
      return res = chroma[m](hue, sat, lbv);
    };
  
    _interpolators = _interpolators.concat((function() {
      var len, o, ref, results;
      ref = ['hsv', 'hsl', 'hsi', 'hcl', 'lch', 'hcg'];
      results = [];
      for (o = 0, len = ref.length; o < len; o++) {
        m = ref[o];
        results.push([m, interpolate_hsx]);
      }
      return results;
    })());
  
    interpolate_num = function(col1, col2, f, m) {
      var n1, n2;
      n1 = col1.num();
      n2 = col2.num();
      return chroma.num(n1 + (n2 - n1) * f, 'num');
    };
  
    _interpolators.push(['num', interpolate_num]);
  
    interpolate_lab = function(col1, col2, f, m) {
      var res, xyz0, xyz1;
      xyz0 = col1.lab();
      xyz1 = col2.lab();
      return res = new Color(xyz0[0] + f * (xyz1[0] - xyz0[0]), xyz0[1] + f * (xyz1[1] - xyz0[1]), xyz0[2] + f * (xyz1[2] - xyz0[2]), m);
    };
  
    _interpolators.push(['lab', interpolate_lab]);
  
  }).call(this);
  