text: /* @license C3.js v0.4.23 | (c) C3 Team and other contributors | http://c3js.org/ */
  (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
      typeof define === 'function' && define.amd ? define(factory) :
      (global.c3 = factory());
  }(this, (function () { 'use strict';
  
      var CLASS = {
          target: 'c3-target',
          chart: 'c3-chart',
          chartLine: 'c3-chart-line',
          chartLines: 'c3-chart-lines',
          chartBar: 'c3-chart-bar',
          chartBars: 'c3-chart-bars',
          chartText: 'c3-chart-text',
          chartTexts: 'c3-chart-texts',
          chartArc: 'c3-chart-arc',
          chartArcs: 'c3-chart-arcs',
          chartArcsTitle: 'c3-chart-arcs-title',
          chartArcsBackground: 'c3-chart-arcs-background',
          chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
          chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
          chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
          selectedCircle: 'c3-selected-circle',
          selectedCircles: 'c3-selected-circles',
          eventRect: 'c3-event-rect',
          eventRects: 'c3-event-rects',
          eventRectsSingle: 'c3-event-rects-single',
          eventRectsMultiple: 'c3-event-rects-multiple',
          zoomRect: 'c3-zoom-rect',
          brush: 'c3-brush',
          focused: 'c3-focused',
          defocused: 'c3-defocused',
          region: 'c3-region',
          regions: 'c3-regions',
          title: 'c3-title',
          tooltipContainer: 'c3-tooltip-container',
          tooltip: 'c3-tooltip',
          tooltipName: 'c3-tooltip-name',
          shape: 'c3-shape',
          shapes: 'c3-shapes',
          line: 'c3-line',
          lines: 'c3-lines',
          bar: 'c3-bar',
          bars: 'c3-bars',
          circle: 'c3-circle',
          circles: 'c3-circles',
          arc: 'c3-arc',
          arcLabelLine: 'c3-arc-label-line',
          arcs: 'c3-arcs',
          area: 'c3-area',
          areas: 'c3-areas',
          empty: 'c3-empty',
          text: 'c3-text',
          texts: 'c3-texts',
          gaugeValue: 'c3-gauge-value',
          grid: 'c3-grid',
          gridLines: 'c3-grid-lines',
          xgrid: 'c3-xgrid',
          xgrids: 'c3-xgrids',
          xgridLine: 'c3-xgrid-line',
          xgridLines: 'c3-xgrid-lines',
          xgridFocus: 'c3-xgrid-focus',
          ygrid: 'c3-ygrid',
          ygrids: 'c3-ygrids',
          ygridLine: 'c3-ygrid-line',
          ygridLines: 'c3-ygrid-lines',
          axis: 'c3-axis',
          axisX: 'c3-axis-x',
          axisXLabel: 'c3-axis-x-label',
          axisY: 'c3-axis-y',
          axisYLabel: 'c3-axis-y-label',
          axisY2: 'c3-axis-y2',
          axisY2Label: 'c3-axis-y2-label',
          legendBackground: 'c3-legend-background',
          legendItem: 'c3-legend-item',
          legendItemEvent: 'c3-legend-item-event',
          legendItemTile: 'c3-legend-item-tile',
          legendItemHidden: 'c3-legend-item-hidden',
          legendItemFocused: 'c3-legend-item-focused',
          dragarea: 'c3-dragarea',
          EXPANDED: '_expanded_',
          SELECTED: '_selected_',
          INCLUDED: '_included_'
      };
  
      var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
        return typeof obj;
      } : function (obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
      };
  
      var classCallCheck = function (instance, Constructor) {
        if (!(instance instanceof Constructor)) {
          throw new TypeError("Cannot call a class as a function");
        }
      };
  
      var inherits = function (subClass, superClass) {
        if (typeof superClass !== "function" && superClass !== null) {
          throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
        }
  
        subClass.prototype = Object.create(superClass && superClass.prototype, {
          constructor: {
            value: subClass,
            enumerable: false,
            writable: true,
            configurable: true
          }
        });
        if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
      };
  
      var possibleConstructorReturn = function (self, call) {
        if (!self) {
          throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
        }
  
        return call && (typeof call === "object" || typeof call === "function") ? call : self;
      };
  
      var isValue = function isValue(v) {
          return v || v === 0;
      };
      var isFunction = function isFunction(o) {
          return typeof o === 'function';
      };
      var isArray = function isArray(o) {
          return Array.isArray(o);
      };
      var isString = function isString(o) {
          return typeof o === 'string';
      };
      var isUndefined = function isUndefined(v) {
          return typeof v === 'undefined';
      };
      var isDefined = function isDefined(v) {
          return typeof v !== 'undefined';
      };
      var ceil10 = function ceil10(v) {
          return Math.ceil(v / 10) * 10;
      };
      var asHalfPixel = function asHalfPixel(n) {
          return Math.ceil(n) + 0.5;
      };
      var diffDomain = function diffDomain(d) {
          return d[1] - d[0];
      };
      var isEmpty = function isEmpty(o) {
          return typeof o === 'undefined' || o === null || isString(o) && o.length === 0 || (typeof o === 'undefined' ? 'undefined' : _typeof(o)) === 'object' && Object.keys(o).length === 0;
      };
      var notEmpty = function notEmpty(o) {
          return !c3_chart_internal_fn.isEmpty(o);
      };
      var getOption = function getOption(options, key, defaultValue) {
          return isDefined(options[key]) ? options[key] : defaultValue;
      };
      var hasValue = function hasValue(dict, value) {
          var found = false;
          Object.keys(dict).forEach(function (key) {
              if (dict[key] === value) {
                  found = true;
              }
          });
          return found;
      };
      var sanitise = function sanitise(str) {
          return typeof str === 'string' ? str.replace(/</g, '&lt;').replace(/>/g, '&gt;') : str;
      };
      var getPathBox = function getPathBox(path) {
          var box = path.getBoundingClientRect(),
              items = [path.pathSegList.getItem(0), path.pathSegList.getItem(1)],
              minX = items[0].x,
              minY = Math.min(items[0].y, items[1].y);
          return { x: minX, y: minY, width: box.width, height: box.height };
      };
  
      var c3_axis_fn;
      var c3_axis_internal_fn;
  
      function AxisInternal(component, params) {
          var internal = this;
          internal.component = component;
          internal.params = params || {};
  
          internal.d3 = component.d3;
          internal.scale = internal.d3.scale.linear();
          internal.range;
          internal.orient = "bottom";
          internal.innerTickSize = 6;
          internal.outerTickSize = this.params.withOuterTick ? 6 : 0;
          internal.tickPadding = 3;
          internal.tickValues = null;
          internal.tickFormat;
          internal.tickArguments;
  
          internal.tickOffset = 0;
          internal.tickCulling = true;
          internal.tickCentered;
          internal.tickTextCharSize;
          internal.tickTextRotate = internal.params.tickTextRotate;
          internal.tickLength;
  
          internal.axis = internal.generateAxis();
      }
      c3_axis_internal_fn = AxisInternal.prototype;
  
      c3_axis_internal_fn.axisX = function (selection, x, tickOffset) {
          selection.attr("transform", function (d) {
              return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
          });
      };
      c3_axis_internal_fn.axisY = function (selection, y) {
          selection.attr("transform", function (d) {
              return "translate(0," + Math.ceil(y(d)) + ")";
          });
      };
      c3_axis_internal_fn.scaleExtent = function (domain) {
          var start = domain[0],
              stop = domain[domain.length - 1];
          return start < stop ? [start, stop] : [stop, start];
      };
      c3_axis_internal_fn.generateTicks = function (scale) {
          var internal = this;
          var i,
              domain,
              ticks = [];
          if (scale.ticks) {
              return scale.ticks.apply(scale, internal.tickArguments);
          }
          domain = scale.domain();
          for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
              ticks.push(i);
          }
          if (ticks.length > 0 && ticks[0] > 0) {
              ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
          }
          return ticks;
      };
      c3_axis_internal_fn.copyScale = function () {
          var internal = this;
          var newScale = internal.scale.copy(),
              domain;
          if (internal.params.isCategory) {
              domain = internal.scale.domain();
              newScale.domain([domain[0], domain[1] - 1]);
          }
          return newScale;
      };
      c3_axis_internal_fn.textFormatted = function (v) {
          var internal = this,
              formatted = internal.tickFormat ? internal.tickFormat(v) : v;
          return typeof formatted !== 'undefined' ? formatted : '';
      };
      c3_axis_internal_fn.updateRange = function () {
          var internal = this;
          internal.range = internal.scale.rangeExtent ? internal.scale.rangeExtent() : internal.scaleExtent(internal.scale.range());
          return internal.range;
      };
      c3_axis_internal_fn.updateTickTextCharSize = function (tick) {
          var internal = this;
          if (internal.tickTextCharSize) {
              return internal.tickTextCharSize;
          }
          var size = {
              h: 11.5,
              w: 5.5
          };
          tick.select('text').text(function (d) {
              return internal.textFormatted(d);
          }).each(function (d) {
              var box = this.getBoundingClientRect(),
                  text = internal.textFormatted(d),
                  h = box.height,
                  w = text ? box.width / text.length : undefined;
              if (h && w) {
                  size.h = h;
                  size.w = w;
              }
          }).text('');
          internal.tickTextCharSize = size;
          return size;
      };
      c3_axis_internal_fn.transitionise = function (selection) {
          return this.params.withoutTransition ? selection : this.d3.transition(selection);
      };
      c3_axis_internal_fn.isVertical = function () {
          return this.orient === 'left' || this.orient === 'right';
      };
      c3_axis_internal_fn.tspanData = function (d, i, ticks, scale) {
          var internal = this;
          var splitted = internal.params.tickMultiline ? internal.splitTickText(d, ticks, scale) : [].concat(internal.textFormatted(d));
  
          if (internal.params.tickMultiline && internal.params.tickMultilineMax > 0) {
              splitted = internal.ellipsify(splitted, internal.params.tickMultilineMax);
          }
  
          return splitted.map(function (s) {
              return { index: i, splitted: s, length: splitted.length };
          });
      };
      c3_axis_internal_fn.splitTickText = function (d, ticks, scale) {
          var internal = this,
              tickText = internal.textFormatted(d),
              maxWidth = internal.params.tickWidth,
              subtext,
              spaceIndex,
              textWidth,
              splitted = [];
  
          if (Object.prototype.toString.call(tickText) === "[object Array]") {
              return tickText;
          }
  
          if (!maxWidth || maxWidth <= 0) {
              maxWidth = internal.isVertical() ? 95 : internal.params.isCategory ? Math.ceil(scale(ticks[1]) - scale(ticks[0])) - 12 : 110;
          }
  
          function split(splitted, text) {
              spaceIndex = undefined;
              for (var i = 1; i < text.length; i++) {
                  if (text.charAt(i) === ' ') {
                      spaceIndex = i;
                  }
                  subtext = text.substr(0, i + 1);
                  textWidth = internal.tickTextCharSize.w * subtext.length;
                  // if text width gets over tick width, split by space index or crrent index
                  if (maxWidth < textWidth) {
                      return split(splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)), text.slice(spaceIndex ? spaceIndex + 1 : i));
                  }
              }
              return splitted.concat(text);
          }
  
          return split(splitted, tickText + "");
      };
      c3_axis_internal_fn.ellipsify = function (splitted, max) {
          if (splitted.length <= max) {
              return splitted;
          }
  
          var ellipsified = splitted.slice(0, max);
          var remaining = 3;
          for (var i = max - 1; i >= 0; i--) {
              var available = ellipsified[i].length;
  
              ellipsified[i] = ellipsified[i].substr(0, available - remaining).padEnd(available, '.');
  
              remaining -= available;
  
              if (remaining <= 0) {
                  break;
              }
          }
  
          return ellipsified;
      };
      c3_axis_internal_fn.updateTickLength = function () {
          var internal = this;
          internal.tickLength = Math.max(internal.innerTickSize, 0) + internal.tickPadding;
      };
      c3_axis_internal_fn.lineY2 = function (d) {
          var internal = this,
              tickPosition = internal.scale(d) + (internal.tickCentered ? 0 : internal.tickOffset);
          return internal.range[0] < tickPosition && tickPosition < internal.range[1] ? internal.innerTickSize : 0;
      };
      c3_axis_internal_fn.textY = function () {
          var internal = this,
              rotate = internal.tickTextRotate;
          return rotate ? 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1) : internal.tickLength;
      };
      c3_axis_internal_fn.textTransform = function () {
          var internal = this,
              rotate = internal.tickTextRotate;
          return rotate ? "rotate(" + rotate + ")" : "";
      };
      c3_axis_internal_fn.textTextAnchor = function () {
          var internal = this,
              rotate = internal.tickTextRotate;
          return rotate ? rotate > 0 ? "start" : "end" : "middle";
      };
      c3_axis_internal_fn.tspanDx = function () {
          var internal = this,
              rotate = internal.tickTextRotate;
          return rotate ? 8 * Math.sin(Math.PI * (rotate / 180)) : 0;
      };
      c3_axis_internal_fn.tspanDy = function (d, i) {
          var internal = this,
              dy = internal.tickTextCharSize.h;
          if (i === 0) {
              if (internal.isVertical()) {
                  dy = -((d.length - 1) * (internal.tickTextCharSize.h / 2) - 3);
              } else {
                  dy = ".71em";
              }
          }
          return dy;
      };
  
      c3_axis_internal_fn.generateAxis = function () {
          var internal = this,
              d3 = internal.d3,
              params = internal.params;
          function axis(g) {
              g.each(function () {
                  var g = axis.g = d3.select(this);
  
                  var scale0 = this.__chart__ || internal.scale,
                      scale1 = this.__chart__ = internal.copyScale();
  
                  var ticks = internal.tickValues ? internal.tickValues : internal.generateTicks(scale1),
                      tick = g.selectAll(".tick").data(ticks, scale1),
                      tickEnter = tick.enter().insert("g", ".domain").attr("class", "tick").style("opacity", 1e-6),
  
                  // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
                  tickExit = tick.exit().remove(),
                      tickUpdate = internal.transitionise(tick).style("opacity", 1),
                      tickTransform,
                      tickX,
                      tickY;
  
                  if (params.isCategory) {
                      internal.tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
                      tickX = internal.tickCentered ? 0 : internal.tickOffset;
                      tickY = internal.tickCentered ? internal.tickOffset : 0;
                  } else {
                      internal.tickOffset = tickX = 0;
                  }
  
                  tickEnter.append("line");
                  tickEnter.append("text");
  
                  internal.updateRange();
                  internal.updateTickLength();
                  internal.updateTickTextCharSize(g.select('.tick'));
  
                  var lineUpdate = tickUpdate.select("line"),
                      textUpdate = tickUpdate.select("text"),
                      tspanUpdate = tick.select("text").selectAll('tspan').data(function (d, i) {
                      return internal.tspanData(d, i, ticks, scale1);
                  });
  
                  tspanUpdate.enter().append('tspan');
                  tspanUpdate.exit().remove();
                  tspanUpdate.text(function (d) {
                      return d.splitted;
                  });
  
                  var path = g.selectAll(".domain").data([0]),
                      pathUpdate = (path.enter().append("path").attr("class", "domain"), internal.transitionise(path));
  
                  // TODO: each attr should be one function and change its behavior by internal.orient, probably
                  switch (internal.orient) {
                      case "bottom":
                          {
                              tickTransform = internal.axisX;
                              lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                                  return internal.lineY2(d, i);
                              });
                              textUpdate.attr("x", 0).attr("y", function (d, i) {
                                  return internal.textY(d, i);
                              }).attr("transform", function (d, i) {
                                  return internal.textTransform(d, i);
                              }).style("text-anchor", function (d, i) {
                                  return internal.textTextAnchor(d, i);
                              });
                              tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                                  return internal.tspanDy(d, i);
                              }).attr('dx', function (d, i) {
                                  return internal.tspanDx(d, i);
                              });
                              pathUpdate.attr("d", "M" + internal.range[0] + "," + internal.outerTickSize + "V0H" + internal.range[1] + "V" + internal.outerTickSize);
                              break;
                          }
                      case "top":
                          {
                              // TODO: rotated tick text
                              tickTransform = internal.axisX;
                              lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                                  return -1 * internal.lineY2(d, i);
                              });
                              textUpdate.attr("x", 0).attr("y", function (d, i) {
                                  return -1 * internal.textY(d, i) - (params.isCategory ? 2 : internal.tickLength - 2);
                              }).attr("transform", function (d, i) {
                                  return internal.textTransform(d, i);
                              }).style("text-anchor", function (d, i) {
                                  return internal.textTextAnchor(d, i);
                              });
                              tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                                  return internal.tspanDy(d, i);
                              }).attr('dx', function (d, i) {
                                  return internal.tspanDx(d, i);
                              });
                              pathUpdate.attr("d", "M" + internal.range[0] + "," + -internal.outerTickSize + "V0H" + internal.range[1] + "V" + -internal.outerTickSize);
                              break;
                          }
                      case "left":
                          {
                              tickTransform = internal.axisY;
                              lineUpdate.attr("x2", -internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
                              textUpdate.attr("x", -internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "end");
                              tspanUpdate.attr('x', -internal.tickLength).attr("dy", function (d, i) {
                                  return internal.tspanDy(d, i);
                              });
                              pathUpdate.attr("d", "M" + -internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + -internal.outerTickSize);
                              break;
                          }
                      case "right":
                          {
                              tickTransform = internal.axisY;
                              lineUpdate.attr("x2", internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
                              textUpdate.attr("x", internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "start");
                              tspanUpdate.attr('x', internal.tickLength).attr("dy", function (d, i) {
                                  return internal.tspanDy(d, i);
                              });
                              pathUpdate.attr("d", "M" + internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + internal.outerTickSize);
                              break;
                          }
                  }
                  if (scale1.rangeBand) {
                      var x = scale1,
                          dx = x.rangeBand() / 2;
                      scale0 = scale1 = function scale1(d) {
                          return x(d) + dx;
                      };
                  } else if (scale0.rangeBand) {
                      scale0 = scale1;
                  } else {
                      tickExit.call(tickTransform, scale1, internal.tickOffset);
                  }
                  tickEnter.call(tickTransform, scale0, internal.tickOffset);
                  tickUpdate.call(tickTransform, scale1, internal.tickOffset);
              });
          }
          axis.scale = function (x) {
              if (!arguments.length) {
                  return internal.scale;
              }
              internal.scale = x;
              return axis;
          };
          axis.orient = function (x) {
              if (!arguments.length) {
                  return internal.orient;
              }
              internal.orient = x in { top: 1, right: 1, bottom: 1, left: 1 } ? x + "" : "bottom";
              return axis;
          };
          axis.tickFormat = function (format) {
              if (!arguments.length) {
                  return internal.tickFormat;
              }
              internal.tickFormat = format;
              return axis;
          };
          axis.tickCentered = function (isCentered) {
              if (!arguments.length) {
                  return internal.tickCentered;
              }
              internal.tickCentered = isCentered;
              return axis;
          };
          axis.tickOffset = function () {
              return internal.tickOffset;
          };
          axis.tickInterval = function () {
              var interval, length;
              if (params.isCategory) {
                  interval = internal.tickOffset * 2;
              } else {
                  length = axis.g.select('path.domain').node().getTotalLength() - internal.outerTickSize * 2;
                  interval = length / axis.g.selectAll('line').size();
              }
              return interval === Infinity ? 0 : interval;
          };
          axis.ticks = function () {
              if (!arguments.length) {
                  return internal.tickArguments;
              }
              internal.tickArguments = arguments;
              return axis;
          };
          axis.tickCulling = function (culling) {
              if (!arguments.length) {
                  return internal.tickCulling;
              }
              internal.tickCulling = culling;
              return axis;
          };
          axis.tickValues = function (x) {
              if (typeof x === 'function') {
                  internal.tickValues = function () {
                      return x(internal.scale.domain());
                  };
              } else {
                  if (!arguments.length) {
                      return internal.tickValues;
                  }
                  internal.tickValues = x;
              }
              return axis;
          };
          return axis;
      };
  
      var Axis = function (_Component) {
          inherits(Axis, _Component);
  
          function Axis(owner) {
              classCallCheck(this, Axis);
  
              var fn = {
                  fn: c3_axis_fn,
                  internal: {
                      fn: c3_axis_internal_fn
                  }
              };
  
              var _this = possibleConstructorReturn(this, (Axis.__proto__ || Object.getPrototypeOf(Axis)).call(this, owner, 'axis', fn));
  
              _this.d3 = owner.d3;
              _this.internal = AxisInternal;
              return _this;
          }
  
          return Axis;
      }(Component);
  
      c3_axis_fn = Axis.prototype;
  
      c3_axis_fn.init = function init() {
          var $$ = this.owner,
              config = $$.config,
              main = $$.main;
          $$.axes.x = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisX).attr("clip-path", config.axis_x_inner ? "" : $$.clipPathForXAxis).attr("transform", $$.getTranslate('x')).style("visibility", config.axis_x_show ? 'visible' : 'hidden');
          $$.axes.x.append("text").attr("class", CLASS.axisXLabel).attr("transform", config.axis_rotated ? "rotate(-90)" : "").style("text-anchor", this.textAnchorForXAxisLabel.bind(this));
          $$.axes.y = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY).attr("clip-path", config.axis_y_inner ? "" : $$.clipPathForYAxis).attr("transform", $$.getTranslate('y')).style("visibility", config.axis_y_show ? 'visible' : 'hidden');
          $$.axes.y.append("text").attr("class", CLASS.axisYLabel).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForYAxisLabel.bind(this));
  
          $$.axes.y2 = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY2)
          // clip-path?
          .attr("transform", $$.getTranslate('y2')).style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
          $$.axes.y2.append("text").attr("class", CLASS.axisY2Label).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForY2AxisLabel.bind(this));
      };
      c3_axis_fn.getXAxis = function getXAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
          var $$ = this.owner,
              config = $$.config,
              axisParams = {
              isCategory: $$.isCategorized(),
              withOuterTick: withOuterTick,
              tickMultiline: config.axis_x_tick_multiline,
              tickMultilineMax: config.axis_x_tick_multiline ? Number(config.axis_x_tick_multilineMax) : 0,
              tickWidth: config.axis_x_tick_width,
              tickTextRotate: withoutRotateTickText ? 0 : config.axis_x_tick_rotate,
              withoutTransition: withoutTransition
          },
              axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient);
  
          if ($$.isTimeSeries() && tickValues && typeof tickValues !== "function") {
              tickValues = tickValues.map(function (v) {
                  return $$.parseDate(v);
              });
          }
  
          // Set tick
          axis.tickFormat(tickFormat).tickValues(tickValues);
          if ($$.isCategorized()) {
              axis.tickCentered(config.axis_x_tick_centered);
              if (isEmpty(config.axis_x_tick_culling)) {
                  config.axis_x_tick_culling = false;
              }
          }
  
          return axis;
      };
      c3_axis_fn.updateXAxisTickValues = function updateXAxisTickValues(targets, axis) {
          var $$ = this.owner,
              config = $$.config,
              tickValues;
          if (config.axis_x_tick_fit || config.axis_x_tick_count) {
              tickValues = this.generateTickValues($$.mapTargetsToUniqueXs(targets), config.axis_x_tick_count, $$.isTimeSeries());
          }
          if (axis) {
              axis.tickValues(tickValues);
          } else {
              $$.xAxis.tickValues(tickValues);
              $$.subXAxis.tickValues(tickValues);
          }
          return tickValues;
      };
      c3_axis_fn.getYAxis = function getYAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
          var $$ = this.owner,
              config = $$.config,
              axisParams = {
              withOuterTick: withOuterTick,
              withoutTransition: withoutTransition,
              tickTextRotate: withoutRotateTickText ? 0 : config.axis_y_tick_rotate
          },
              axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient).tickFormat(tickFormat);
          if ($$.isTimeSeriesY()) {
              axis.ticks($$.d3.time[config.axis_y_tick_time_value], config.axis_y_tick_time_interval);
          } else {
              axis.tickValues(tickValues);
          }
          return axis;
      };
      c3_axis_fn.getId = function getId(id) {
          var config = this.owner.config;
          return id in config.data_axes ? config.data_axes[id] : 'y';
      };
      c3_axis_fn.getXAxisTickFormat = function getXAxisTickFormat() {
          var $$ = this.owner,
              config = $$.config,
              format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) {
              return v < 0 ? v.toFixed(0) : v;
          };
          if (config.axis_x_tick_format) {
              if (isFunction(config.axis_x_tick_format)) {
                  format = config.axis_x_tick_format;
              } else if ($$.isTimeSeries()) {
                  format = function format(date) {
                      return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
                  };
              }
          }
          return isFunction(format) ? function (v) {
              return format.call($$, v);
          } : format;
      };
      c3_axis_fn.getTickValues = function getTickValues(tickValues, axis) {
          return tickValues ? tickValues : axis ? axis.tickValues() : undefined;
      };
      c3_axis_fn.getXAxisTickValues = function getXAxisTickValues() {
          return this.getTickValues(this.owner.config.axis_x_tick_values, this.owner.xAxis);
      };
      c3_axis_fn.getYAxisTickValues = function getYAxisTickValues() {
          return this.getTickValues(this.owner.config.axis_y_tick_values, this.owner.yAxis);
      };
      c3_axis_fn.getY2AxisTickValues = function getY2AxisTickValues() {
          return this.getTickValues(this.owner.config.axis_y2_tick_values, this.owner.y2Axis);
      };
      c3_axis_fn.getLabelOptionByAxisId = function getLabelOptionByAxisId(axisId) {
          var $$ = this.owner,
              config = $$.config,
              option;
          if (axisId === 'y') {
              option = config.axis_y_label;
          } else if (axisId === 'y2') {
              option = config.axis_y2_label;
          } else if (axisId === 'x') {
              option = config.axis_x_label;
          }
          return option;
      };
      c3_axis_fn.getLabelText = function getLabelText(axisId) {
          var option = this.getLabelOptionByAxisId(axisId);
          return isString(option) ? option : option ? option.text : null;
      };
      c3_axis_fn.setLabelText = function setLabelText(axisId, text) {
          var $$ = this.owner,
              config = $$.config,
              option = this.getLabelOptionByAxisId(axisId);
          if (isString(option)) {
              if (axisId === 'y') {
                  config.axis_y_label = text;
              } else if (axisId === 'y2') {
                  config.axis_y2_label = text;
              } else if (axisId === 'x') {
                  config.axis_x_label = text;
              }
          } else if (option) {
              option.text = text;
          }
      };
      c3_axis_fn.getLabelPosition = function getLabelPosition(axisId, defaultPosition) {
          var option = this.getLabelOptionByAxisId(axisId),
              position = option && (typeof option === 'undefined' ? 'undefined' : _typeof(option)) === 'object' && option.position ? option.position : defaultPosition;
          return {
              isInner: position.indexOf('inner') >= 0,
              isOuter: position.indexOf('outer') >= 0,
              isLeft: position.indexOf('left') >= 0,
              isCenter: position.indexOf('center') >= 0,
              isRight: position.indexOf('right') >= 0,
              isTop: position.indexOf('top') >= 0,
              isMiddle: position.indexOf('middle') >= 0,
              isBottom: position.indexOf('bottom') >= 0
          };
      };
      c3_axis_fn.getXAxisLabelPosition = function getXAxisLabelPosition() {
          return this.getLabelPosition('x', this.owner.config.axis_rotated ? 'inner-top' : 'inner-right');
      };
      c3_axis_fn.getYAxisLabelPosition = function getYAxisLabelPosition() {
          return this.getLabelPosition('y', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
      };
      c3_axis_fn.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
          return this.getLabelPosition('y2', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
      };
      c3_axis_fn.getLabelPositionById = function getLabelPositionById(id) {
          return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
      };
      c3_axis_fn.textForXAxisLabel = function textForXAxisLabel() {
          return this.getLabelText('x');
      };
      c3_axis_fn.textForYAxisLabel = function textForYAxisLabel() {
          return this.getLabelText('y');
      };
      c3_axis_fn.textForY2AxisLabel = function textForY2AxisLabel() {
          return this.getLabelText('y2');
      };
      c3_axis_fn.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
          var $$ = this.owner;
          if (forHorizontal) {
              return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
          } else {
              return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
          }
      };
      c3_axis_fn.dxForAxisLabel = function dxForAxisLabel(forHorizontal, position) {
          if (forHorizontal) {
              return position.isLeft ? "0.5em" : position.isRight ? "-0.5em" : "0";
          } else {
              return position.isTop ? "-0.5em" : position.isBottom ? "0.5em" : "0";
          }
      };
      c3_axis_fn.textAnchorForAxisLabel = function textAnchorForAxisLabel(forHorizontal, position) {
          if (forHorizontal) {
              return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
          } else {
              return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
          }
      };
      c3_axis_fn.xForXAxisLabel = function xForXAxisLabel() {
          return this.xForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
      };
      c3_axis_fn.xForYAxisLabel = function xForYAxisLabel() {
          return this.xForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
      };
      c3_axis_fn.xForY2AxisLabel = function xForY2AxisLabel() {
          return this.xForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      c3_axis_fn.dxForXAxisLabel = function dxForXAxisLabel() {
          return this.dxForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
      };
      c3_axis_fn.dxForYAxisLabel = function dxForYAxisLabel() {
          return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
      };
      c3_axis_fn.dxForY2AxisLabel = function dxForY2AxisLabel() {
          return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      c3_axis_fn.dyForXAxisLabel = function dyForXAxisLabel() {
          var $$ = this.owner,
              config = $$.config,
              position = this.getXAxisLabelPosition();
          if (config.axis_rotated) {
              return position.isInner ? "1.2em" : -25 - ($$.config.axis_x_inner ? 0 : this.getMaxTickWidth('x'));
          } else {
              return position.isInner ? "-0.5em" : config.axis_x_height ? config.axis_x_height - 10 : "3em";
          }
      };
      c3_axis_fn.dyForYAxisLabel = function dyForYAxisLabel() {
          var $$ = this.owner,
              position = this.getYAxisLabelPosition();
          if ($$.config.axis_rotated) {
              return position.isInner ? "-0.5em" : "3em";
          } else {
              return position.isInner ? "1.2em" : -10 - ($$.config.axis_y_inner ? 0 : this.getMaxTickWidth('y') + 10);
          }
      };
      c3_axis_fn.dyForY2AxisLabel = function dyForY2AxisLabel() {
          var $$ = this.owner,
              position = this.getY2AxisLabelPosition();
          if ($$.config.axis_rotated) {
              return position.isInner ? "1.2em" : "-2.2em";
          } else {
              return position.isInner ? "-0.5em" : 15 + ($$.config.axis_y2_inner ? 0 : this.getMaxTickWidth('y2') + 15);
          }
      };
      c3_axis_fn.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel(!$$.config.axis_rotated, this.getXAxisLabelPosition());
      };
      c3_axis_fn.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getYAxisLabelPosition());
      };
      c3_axis_fn.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
          var $$ = this.owner;
          return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getY2AxisLabelPosition());
      };
      c3_axis_fn.getMaxTickWidth = function getMaxTickWidth(id, withoutRecompute) {
          var $$ = this.owner,
              config = $$.config,
              maxWidth = 0,
              targetsToShow,
              scale,
              axis,
              dummy,
              svg;
          if (withoutRecompute && $$.currentMaxTickWidths[id]) {
              return $$.currentMaxTickWidths[id];
          }
          if ($$.svg) {
              targetsToShow = $$.filterTargetsToShow($$.data.targets);
              if (id === 'y') {
                  scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
                  axis = this.getYAxis(scale, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, false, true, true);
              } else if (id === 'y2') {
                  scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
                  axis = this.getYAxis(scale, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, false, true, true);
              } else {
                  scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
                  axis = this.getXAxis(scale, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, false, true, true);
                  this.updateXAxisTickValues(targetsToShow, axis);
              }
              dummy = $$.d3.select('body').append('div').classed('c3', true);
              svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0), svg.append('g').call(axis).each(function () {
                  $$.d3.select(this).selectAll('text').each(function () {
                      var box = this.getBoundingClientRect();
                      if (maxWidth < box.width) {
                          maxWidth = box.width;
                      }
                  });
                  dummy.remove();
              });
          }
          $$.currentMaxTickWidths[id] = maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
          return $$.currentMaxTickWidths[id];
      };
  
      c3_axis_fn.updateLabels = function updateLabels(withTransition) {
          var $$ = this.owner;
          var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
              axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
              axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label);
          (withTransition ? axisXLabel.transition() : axisXLabel).attr("x", this.xForXAxisLabel.bind(this)).attr("dx", this.dxForXAxisLabel.bind(this)).attr("dy", this.dyForXAxisLabel.bind(this)).text(this.textForXAxisLabel.bind(this));
          (withTransition ? axisYLabel.transition() : axisYLabel).attr("x", this.xForYAxisLabel.bind(this)).attr("dx", this.dxForYAxisLabel.bind(this)).attr("dy", this.dyForYAxisLabel.bind(this)).text(this.textForYAxisLabel.bind(this));
          (withTransition ? axisY2Label.transition() : axisY2Label).attr("x", this.xForY2AxisLabel.bind(this)).attr("dx", this.dxForY2AxisLabel.bind(this)).attr("dy", this.dyForY2AxisLabel.bind(this)).text(this.textForY2AxisLabel.bind(this));
      };
      c3_axis_fn.getPadding = function getPadding(padding, key, defaultValue, domainLength) {
          var p = typeof padding === 'number' ? padding : padding[key];
          if (!isValue(p)) {
              return defaultValue;
          }
          if (padding.unit === 'ratio') {
              return padding[key] * domainLength;
          }
          // assume padding is pixels if unit is not specified
          return this.convertPixelsToAxisPadding(p, domainLength);
      };
      c3_axis_fn.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(pixels, domainLength) {
          var $$ = this.owner,
              length = $$.config.axis_rotated ? $$.width : $$.height;
          return domainLength * (pixels / length);
      };
      c3_axis_fn.generateTickValues = function generateTickValues(values, tickCount, forTimeSeries) {
          var tickValues = values,
              targetCount,
              start,
              end,
              count,
              interval,
              i,
              tickValue;
          if (tickCount) {
              targetCount = isFunction(tickCount) ? tickCount() : tickCount;
              // compute ticks according to tickCount
              if (targetCount === 1) {
                  tickValues = [values[0]];
              } else if (targetCount === 2) {
                  tickValues = [values[0], values[values.length - 1]];
              } else if (targetCount > 2) {
                  count = targetCount - 2;
                  start = values[0];
                  end = values[values.length - 1];
                  interval = (end - start) / (count + 1);
                  // re-construct unique values
                  tickValues = [start];
                  for (i = 0; i < count; i++) {
                      tickValue = +start + interval * (i + 1);
                      tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
                  }
                  tickValues.push(end);
              }
          }
          if (!forTimeSeries) {
              tickValues = tickValues.sort(function (a, b) {
                  return a - b;
              });
          }
          return tickValues;
      };
      c3_axis_fn.generateTransitions = function generateTransitions(duration) {
          var $$ = this.owner,
              axes = $$.axes;
          return {
              axisX: duration ? axes.x.transition().duration(duration) : axes.x,
              axisY: duration ? axes.y.transition().duration(duration) : axes.y,
              axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
              axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
          };
      };
      c3_axis_fn.redraw = function redraw(transitions, isHidden) {
          var $$ = this.owner;
          $$.axes.x.style("opacity", isHidden ? 0 : 1);
          $$.axes.y.style("opacity", isHidden ? 0 : 1);
          $$.axes.y2.style("opacity", isHidden ? 0 : 1);
          $$.axes.subx.style("opacity", isHidden ? 0 : 1);
          transitions.axisX.call($$.xAxis);
          transitions.axisY.call($$.yAxis);
          transitions.axisY2.call($$.y2Axis);
          transitions.axisSubX.call($$.subXAxis);
      };
  
      var c3 = { version: "0.4.23" };
  
      var c3_chart_fn;
      var c3_chart_internal_fn;
  
      function Component(owner, componentKey, fn) {
          this.owner = owner;
          c3.chart.internal[componentKey] = fn;
      }
  
      function Chart(config) {
          var $$ = this.internal = new ChartInternal(this);
          $$.loadConfig(config);
  
          $$.beforeInit(config);
          $$.init();
          $$.afterInit(config);
  
          // bind "this" to nested API
          (function bindThis(fn, target, argThis) {
              Object.keys(fn).forEach(function (key) {
                  target[key] = fn[key].bind(argThis);
                  if (Object.keys(fn[key]).length > 0) {
                      bindThis(fn[key], target[key], argThis);
                  }
              });
          })(c3_chart_fn, this, this);
      }
  
      function ChartInternal(api) {
          var $$ = this;
          $$.d3 = window.d3 ? window.d3 : typeof require !== 'undefined' ? require("d3") : undefined;
          $$.api = api;
          $$.config = $$.getDefaultConfig();
          $$.data = {};
          $$.cache = {};
          $$.axes = {};
      }
  
      c3.generate = function (config) {
          return new Chart(config);
      };
  
      c3.chart = {
          fn: Chart.prototype,
          internal: {
              fn: ChartInternal.prototype
          }
      };
      c3_chart_fn = c3.chart.fn;
      c3_chart_internal_fn = c3.chart.internal.fn;
  
      c3_chart_internal_fn.beforeInit = function () {
          // can do something
      };
      c3_chart_internal_fn.afterInit = function () {
          // can do something
      };
      c3_chart_internal_fn.init = function () {
          var $$ = this,
              config = $$.config;
  
          $$.initParams();
  
          if (config.data_url) {
              $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_headers, config.data_keys, $$.initWithData);
          } else if (config.data_json) {
              $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
          } else if (config.data_rows) {
              $$.initWithData($$.convertRowsToData(config.data_rows));
          } else if (config.data_columns) {
              $$.initWithData($$.convertColumnsToData(config.data_columns));
          } else {
              throw Error('url or json or rows or columns is required.');
          }
      };
  
      c3_chart_internal_fn.initParams = function () {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config;
  
          // MEMO: clipId needs to be unique because it conflicts when multiple charts exist
          $$.clipId = "c3-" + +new Date() + '-clip', $$.clipIdForXAxis = $$.clipId + '-xaxis', $$.clipIdForYAxis = $$.clipId + '-yaxis', $$.clipIdForGrid = $$.clipId + '-grid', $$.clipIdForSubchart = $$.clipId + '-subchart', $$.clipPath = $$.getClipPath($$.clipId), $$.clipPathForXAxis = $$.getClipPath($$.clipIdForXAxis), $$.clipPathForYAxis = $$.getClipPath($$.clipIdForYAxis);
          $$.clipPathForGrid = $$.getClipPath($$.clipIdForGrid), $$.clipPathForSubchart = $$.getClipPath($$.clipIdForSubchart), $$.dragStart = null;
          $$.dragging = false;
          $$.flowing = false;
          $$.cancelClick = false;
          $$.mouseover = false;
          $$.transiting = false;
  
          $$.color = $$.generateColor();
          $$.levelColor = $$.generateLevelColor();
  
          $$.dataTimeFormat = config.data_xLocaltime ? d3.time.format : d3.time.format.utc;
          $$.axisTimeFormat = config.axis_x_localtime ? d3.time.format : d3.time.format.utc;
          $$.defaultAxisTimeFormat = $$.axisTimeFormat.multi([[".%L", function (d) {
              return d.getMilliseconds();
          }], [":%S", function (d) {
              return d.getSeconds();
          }], ["%I:%M", function (d) {
              return d.getMinutes();
          }], ["%I %p", function (d) {
              return d.getHours();
          }], ["%-m/%-d", function (d) {
              return d.getDay() && d.getDate() !== 1;
          }], ["%-m/%-d", function (d) {
              return d.getDate() !== 1;
          }], ["%-m/%-d", function (d) {
              return d.getMonth();
          }], ["%Y/%-m/%-d", function () {
              return true;
          }]]);
  
          $$.hiddenTargetIds = [];
          $$.hiddenLegendIds = [];
          $$.focusedTargetIds = [];
          $$.defocusedTargetIds = [];
  
          $$.xOrient = config.axis_rotated ? config.axis_x_inner ? "right" : "left" : config.axis_x_inner ? "top" : "bottom";
          $$.yOrient = config.axis_rotated ? config.axis_y_inner ? "top" : "bottom" : config.axis_y_inner ? "right" : "left";
          $$.y2Orient = config.axis_rotated ? config.axis_y2_inner ? "bottom" : "top" : config.axis_y2_inner ? "left" : "right";
          $$.subXOrient = config.axis_rotated ? "left" : "bottom";
  
          $$.isLegendRight = config.legend_position === 'right';
          $$.isLegendInset = config.legend_position === 'inset';
          $$.isLegendTop = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'top-right';
          $$.isLegendLeft = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'bottom-left';
          $$.legendStep = 0;
          $$.legendItemWidth = 0;
          $$.legendItemHeight = 0;
  
          $$.currentMaxTickWidths = {
              x: 0,
              y: 0,
              y2: 0
          };
  
          $$.rotated_padding_left = 30;
          $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
          $$.rotated_padding_top = 5;
  
          $$.withoutFadeIn = {};
  
          $$.intervalForObserveInserted = undefined;
  
          $$.axes.subx = d3.selectAll([]); // needs when excluding subchart.js
      };
  
      c3_chart_internal_fn.initChartElements = function () {
          if (this.initBar) {
              this.initBar();
          }
          if (this.initLine) {
              this.initLine();
          }
          if (this.initArc) {
              this.initArc();
          }
          if (this.initGauge) {
              this.initGauge();
          }
          if (this.initText) {
              this.initText();
          }
      };
  
      c3_chart_internal_fn.initWithData = function (data) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config;
          var defs,
              main,
              binding = true;
  
          $$.axis = new Axis($$);
  
          if ($$.initPie) {
              $$.initPie();
          }
          if ($$.initBrush) {
              $$.initBrush();
          }
          if ($$.initZoom) {
              $$.initZoom();
          }
  
          if (!config.bindto) {
              $$.selectChart = d3.selectAll([]);
          } else if (typeof config.bindto.node === 'function') {
              $$.selectChart = config.bindto;
          } else {
              $$.selectChart = d3.select(config.bindto);
          }
          if ($$.selectChart.empty()) {
              $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
              $$.observeInserted($$.selectChart);
              binding = false;
          }
          $$.selectChart.html("").classed("c3", true);
  
          // Init data as targets
          $$.data.xs = {};
          $$.data.targets = $$.convertDataToTargets(data);
  
          if (config.data_filter) {
              $$.data.targets = $$.data.targets.filter(config.data_filter);
          }
  
          // Set targets to hide if needed
          if (config.data_hide) {
              $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
          }
          if (config.legend_hide) {
              $$.addHiddenLegendIds(config.legend_hide === true ? $$.mapToIds($$.data.targets) : config.legend_hide);
          }
  
          // Init sizes and scales
          $$.updateSizes();
          $$.updateScales();
  
          // Set domains for each scale
          $$.x.domain(d3.extent($$.getXDomain($$.data.targets)));
          $$.y.domain($$.getYDomain($$.data.targets, 'y'));
          $$.y2.domain($$.getYDomain($$.data.targets, 'y2'));
          $$.subX.domain($$.x.domain());
          $$.subY.domain($$.y.domain());
          $$.subY2.domain($$.y2.domain());
  
          // Save original x domain for zoom update
          $$.orgXDomain = $$.x.domain();
  
          // Set initialized scales to brush and zoom
          if ($$.brush) {
              $$.brush.scale($$.subX);
          }
          if (config.zoom_enabled) {
              $$.zoom.scale($$.x);
          }
  
          /*-- Basic Elements --*/
  
          // Define svgs
          $$.svg = $$.selectChart.append("svg").style("overflow", "hidden").on('mouseenter', function () {
              return config.onmouseover.call($$);
          }).on('mouseleave', function () {
              return config.onmouseout.call($$);
          });
  
          if ($$.config.svg_classname) {
              $$.svg.attr('class', $$.config.svg_classname);
          }
  
          // Define defs
          defs = $$.svg.append("defs");
          $$.clipChart = $$.appendClip(defs, $$.clipId);
          $$.clipXAxis = $$.appendClip(defs, $$.clipIdForXAxis);
          $$.clipYAxis = $$.appendClip(defs, $$.clipIdForYAxis);
          $$.clipGrid = $$.appendClip(defs, $$.clipIdForGrid);
          $$.clipSubchart = $$.appendClip(defs, $$.clipIdForSubchart);
          $$.updateSvgSize();
  
          // Define regions
          main = $$.main = $$.svg.append("g").attr("transform", $$.getTranslate('main'));
  
          if ($$.initSubchart) {
              $$.initSubchart();
          }
          if ($$.initTooltip) {
              $$.initTooltip();
          }
          if ($$.initLegend) {
              $$.initLegend();
          }
          if ($$.initTitle) {
              $$.initTitle();
          }
  
          /*-- Main Region --*/
  
          // text when empty
          main.append("text").attr("class", CLASS.text + ' ' + CLASS.empty).attr("text-anchor", "middle") // horizontal centering of text at x position in all browsers.
          .attr("dominant-baseline", "middle"); // vertical centering of text at y position in all browsers, except IE.
  
          // Regions
          $$.initRegion();
  
          // Grids
          $$.initGrid();
  
          // Define g for chart area
          main.append('g').attr("clip-path", $$.clipPath).attr('class', CLASS.chart);
  
          // Grid lines
          if (config.grid_lines_front) {
              $$.initGridLines();
          }
  
          // Cover whole with rects for events
          $$.initEventRect();
  
          // Define g for chart
          $$.initChartElements();
  
          // if zoom privileged, insert rect to forefront
          // TODO: is this needed?
          main.insert('rect', config.zoom_privileged ? null : 'g.' + CLASS.regions).attr('class', CLASS.zoomRect).attr('width', $$.width).attr('height', $$.height).style('opacity', 0).on("dblclick.zoom", null);
  
          // Set default extent if defined
          if (config.axis_x_extent) {
              $$.brush.extent($$.getDefaultExtent());
          }
  
          // Add Axis
          $$.axis.init();
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Draw with targets
          if (binding) {
              $$.updateDimension();
              $$.config.oninit.call($$);
              $$.redraw({
                  withTransition: false,
                  withTransform: true,
                  withUpdateXDomain: true,
                  withUpdateOrgXDomain: true,
                  withTransitionForAxis: false
              });
          }
  
          // Bind resize event
          $$.bindResize();
  
          // export element of the chart
          $$.api.element = $$.selectChart.node();
      };
  
      c3_chart_internal_fn.smoothLines = function (el, type) {
          var $$ = this;
          if (type === 'grid') {
              el.each(function () {
                  var g = $$.d3.select(this),
                      x1 = g.attr('x1'),
                      x2 = g.attr('x2'),
                      y1 = g.attr('y1'),
                      y2 = g.attr('y2');
                  g.attr({
                      'x1': Math.ceil(x1),
                      'x2': Math.ceil(x2),
                      'y1': Math.ceil(y1),
                      'y2': Math.ceil(y2)
                  });
              });
          }
      };
  
      c3_chart_internal_fn.updateSizes = function () {
          var $$ = this,
              config = $$.config;
          var legendHeight = $$.legend ? $$.getLegendHeight() : 0,
              legendWidth = $$.legend ? $$.getLegendWidth() : 0,
              legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
              hasArc = $$.hasArcType(),
              xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
              subchartHeight = config.subchart_show && !hasArc ? config.subchart_size_height + xAxisHeight : 0;
  
          $$.currentWidth = $$.getCurrentWidth();
          $$.currentHeight = $$.getCurrentHeight();
  
          // for main
          $$.margin = config.axis_rotated ? {
              top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
              right: hasArc ? 0 : $$.getCurrentPaddingRight(),
              bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
              left: subchartHeight + (hasArc ? 0 : $$.getCurrentPaddingLeft())
          } : {
              top: 4 + $$.getCurrentPaddingTop(), // for top tick text
              right: hasArc ? 0 : $$.getCurrentPaddingRight(),
              bottom: xAxisHeight + subchartHeight + legendHeightForBottom + $$.getCurrentPaddingBottom(),
              left: hasArc ? 0 : $$.getCurrentPaddingLeft()
          };
  
          // for subchart
          $$.margin2 = config.axis_rotated ? {
              top: $$.margin.top,
              right: NaN,
              bottom: 20 + legendHeightForBottom,
              left: $$.rotated_padding_left
          } : {
              top: $$.currentHeight - subchartHeight - legendHeightForBottom,
              right: NaN,
              bottom: xAxisHeight + legendHeightForBottom,
              left: $$.margin.left
          };
  
          // for legend
          $$.margin3 = {
              top: 0,
              right: NaN,
              bottom: 0,
              left: 0
          };
          if ($$.updateSizeForLegend) {
              $$.updateSizeForLegend(legendHeight, legendWidth);
          }
  
          $$.width = $$.currentWidth - $$.margin.left - $$.margin.right;
          $$.height = $$.currentHeight - $$.margin.top - $$.margin.bottom;
          if ($$.width < 0) {
              $$.width = 0;
          }
          if ($$.height < 0) {
              $$.height = 0;
          }
  
          $$.width2 = config.axis_rotated ? $$.margin.left - $$.rotated_padding_left - $$.rotated_padding_right : $$.width;
          $$.height2 = config.axis_rotated ? $$.height : $$.currentHeight - $$.margin2.top - $$.margin2.bottom;
          if ($$.width2 < 0) {
              $$.width2 = 0;
          }
          if ($$.height2 < 0) {
              $$.height2 = 0;
          }
  
          // for arc
          $$.arcWidth = $$.width - ($$.isLegendRight ? legendWidth + 10 : 0);
          $$.arcHeight = $$.height - ($$.isLegendRight ? 0 : 10);
          if ($$.hasType('gauge') && !config.gauge_fullCircle) {
              $$.arcHeight += $$.height - $$.getGaugeLabelHeight();
          }
          if ($$.updateRadius) {
              $$.updateRadius();
          }
  
          if ($$.isLegendRight && hasArc) {
              $$.margin3.left = $$.arcWidth / 2 + $$.radiusExpanded * 1.1;
          }
      };
  
      c3_chart_internal_fn.updateTargets = function (targets) {
          var $$ = this;
  
          /*-- Main --*/
  
          //-- Text --//
          $$.updateTargetsForText(targets);
  
          //-- Bar --//
          $$.updateTargetsForBar(targets);
  
          //-- Line --//
          $$.updateTargetsForLine(targets);
  
          //-- Arc --//
          if ($$.hasArcType() && $$.updateTargetsForArc) {
              $$.updateTargetsForArc(targets);
          }
  
          /*-- Sub --*/
  
          if ($$.updateTargetsForSubchart) {
              $$.updateTargetsForSubchart(targets);
          }
  
          // Fade-in each chart
          $$.showTargets();
      };
      c3_chart_internal_fn.showTargets = function () {
          var $$ = this;
          $$.svg.selectAll('.' + CLASS.target).filter(function (d) {
              return $$.isTargetToShow(d.id);
          }).transition().duration($$.config.transition_duration).style("opacity", 1);
      };
  
      c3_chart_internal_fn.redraw = function (options, transitions) {
          var $$ = this,
              main = $$.main,
              d3 = $$.d3,
              config = $$.config;
          var areaIndices = $$.getShapeIndices($$.isAreaType),
              barIndices = $$.getShapeIndices($$.isBarType),
              lineIndices = $$.getShapeIndices($$.isLineType);
          var withY, withSubchart, withTransition, withTransitionForExit, withTransitionForAxis, withTransform, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain, withLegend, withEventRect, withDimension, withUpdateXAxis;
          var hideAxis = $$.hasArcType();
          var drawArea, drawBar, drawLine, xForText, yForText;
          var duration, durationForExit, durationForAxis;
          var waitForDraw, flow;
          var targetsToShow = $$.filterTargetsToShow($$.data.targets),
              tickValues,
              i,
              intervalForCulling,
              xDomainForZoom;
          var xv = $$.xv.bind($$),
              cx,
              cy;
  
          options = options || {};
          withY = getOption(options, "withY", true);
          withSubchart = getOption(options, "withSubchart", true);
          withTransition = getOption(options, "withTransition", true);
          withTransform = getOption(options, "withTransform", false);
          withUpdateXDomain = getOption(options, "withUpdateXDomain", false);
          withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", false);
          withTrimXDomain = getOption(options, "withTrimXDomain", true);
          withUpdateXAxis = getOption(options, "withUpdateXAxis", withUpdateXDomain);
          withLegend = getOption(options, "withLegend", false);
          withEventRect = getOption(options, "withEventRect", true);
          withDimension = getOption(options, "withDimension", true);
          withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
          withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);
  
          duration = withTransition ? config.transition_duration : 0;
          durationForExit = withTransitionForExit ? duration : 0;
          durationForAxis = withTransitionForAxis ? duration : 0;
  
          transitions = transitions || $$.axis.generateTransitions(durationForAxis);
  
          // update legend and transform each g
          if (withLegend && config.legend_show) {
              $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
          } else if (withDimension) {
              // need to update dimension (e.g. axis.y.tick.values) because y tick values should change
              // no need to update axis in it because they will be updated in redraw()
              $$.updateDimension(true);
          }
  
          // MEMO: needed for grids calculation
          if ($$.isCategorized() && targetsToShow.length === 0) {
              $$.x.domain([0, $$.axes.x.selectAll('.tick').size()]);
          }
  
          if (targetsToShow.length) {
              $$.updateXDomain(targetsToShow, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain);
              if (!config.axis_x_tick_values) {
                  tickValues = $$.axis.updateXAxisTickValues(targetsToShow);
              }
          } else {
              $$.xAxis.tickValues([]);
              $$.subXAxis.tickValues([]);
          }
  
          if (config.zoom_rescale && !options.flow) {
              xDomainForZoom = $$.x.orgDomain();
          }
  
          $$.y.domain($$.getYDomain(targetsToShow, 'y', xDomainForZoom));
          $$.y2.domain($$.getYDomain(targetsToShow, 'y2', xDomainForZoom));
  
          if (!config.axis_y_tick_values && config.axis_y_tick_count) {
              $$.yAxis.tickValues($$.axis.generateTickValues($$.y.domain(), config.axis_y_tick_count));
          }
          if (!config.axis_y2_tick_values && config.axis_y2_tick_count) {
              $$.y2Axis.tickValues($$.axis.generateTickValues($$.y2.domain(), config.axis_y2_tick_count));
          }
  
          // axes
          $$.axis.redraw(transitions, hideAxis);
  
          // Update axis label
          $$.axis.updateLabels(withTransition);
  
          // show/hide if manual culling needed
          if ((withUpdateXDomain || withUpdateXAxis) && targetsToShow.length) {
              if (config.axis_x_tick_culling && tickValues) {
                  for (i = 1; i < tickValues.length; i++) {
                      if (tickValues.length / i < config.axis_x_tick_culling_max) {
                          intervalForCulling = i;
                          break;
                      }
                  }
                  $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').each(function (e) {
                      var index = tickValues.indexOf(e);
                      if (index >= 0) {
                          d3.select(this).style('display', index % intervalForCulling ? 'none' : 'block');
                      }
                  });
              } else {
                  $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').style('display', 'block');
              }
          }
  
          // setup drawer - MEMO: these must be called after axis updated
          drawArea = $$.generateDrawArea ? $$.generateDrawArea(areaIndices, false) : undefined;
          drawBar = $$.generateDrawBar ? $$.generateDrawBar(barIndices) : undefined;
          drawLine = $$.generateDrawLine ? $$.generateDrawLine(lineIndices, false) : undefined;
          xForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, true);
          yForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, false);
  
          // Update sub domain
          if (withY) {
              $$.subY.domain($$.getYDomain(targetsToShow, 'y'));
              $$.subY2.domain($$.getYDomain(targetsToShow, 'y2'));
          }
  
          // xgrid focus
          $$.updateXgridFocus();
  
          // Data empty label positioning and text.
          main.select("text." + CLASS.text + '.' + CLASS.empty).attr("x", $$.width / 2).attr("y", $$.height / 2).text(config.data_empty_label_text).transition().style('opacity', targetsToShow.length ? 0 : 1);
  
          // grid
          $$.updateGrid(duration);
  
          // rect for regions
          $$.updateRegion(duration);
  
          // bars
          $$.updateBar(durationForExit);
  
          // lines, areas and cricles
          $$.updateLine(durationForExit);
          $$.updateArea(durationForExit);
          $$.updateCircle();
  
          // text
          if ($$.hasDataLabel()) {
              $$.updateText(durationForExit);
          }
  
          // title
          if ($$.redrawTitle) {
              $$.redrawTitle();
          }
  
          // arc
          if ($$.redrawArc) {
              $$.redrawArc(duration, durationForExit, withTransform);
          }
  
          // subchart
          if ($$.redrawSubchart) {
              $$.redrawSubchart(withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices);
          }
  
          // circles for select
          main.selectAll('.' + CLASS.selectedCircles).filter($$.isBarType.bind($$)).selectAll('circle').remove();
  
          // event rects will redrawn when flow called
          if (config.interaction_enabled && !options.flow && withEventRect) {
              $$.redrawEventRect();
              if ($$.updateZoom) {
                  $$.updateZoom();
              }
          }
  
          // update circleY based on updated parameters
          $$.updateCircleY();
  
          // generate circle x/y functions depending on updated params
          cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$);
          cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$);
  
          if (options.flow) {
              flow = $$.generateFlow({
                  targets: targetsToShow,
                  flow: options.flow,
                  duration: options.flow.duration,
                  drawBar: drawBar,
                  drawLine: drawLine,
                  drawArea: drawArea,
                  cx: cx,
                  cy: cy,
                  xv: xv,
                  xForText: xForText,
                  yForText: yForText
              });
          }
  
          if ((duration || flow) && $$.isTabVisible()) {
              // Only use transition if tab visible. See #938.
              // transition should be derived from one transition
              d3.transition().duration(duration).each(function () {
                  var transitionsToWait = [];
  
                  // redraw and gather transitions
                  [$$.redrawBar(drawBar, true), $$.redrawLine(drawLine, true), $$.redrawArea(drawArea, true), $$.redrawCircle(cx, cy, true), $$.redrawText(xForText, yForText, options.flow, true), $$.redrawRegion(true), $$.redrawGrid(true)].forEach(function (transitions) {
                      transitions.forEach(function (transition) {
                          transitionsToWait.push(transition);
                      });
                  });
  
                  // Wait for end of transitions to call flow and onrendered callback
                  waitForDraw = $$.generateWait();
                  transitionsToWait.forEach(function (t) {
                      waitForDraw.add(t);
                  });
              }).call(waitForDraw, function () {
                  if (flow) {
                      flow();
                  }
                  if (config.onrendered) {
                      config.onrendered.call($$);
                  }
              });
          } else {
              $$.redrawBar(drawBar);
              $$.redrawLine(drawLine);
              $$.redrawArea(drawArea);
              $$.redrawCircle(cx, cy);
              $$.redrawText(xForText, yForText, options.flow);
              $$.redrawRegion();
              $$.redrawGrid();
              if (config.onrendered) {
                  config.onrendered.call($$);
              }
          }
  
          // update fadein condition
          $$.mapToIds($$.data.targets).forEach(function (id) {
              $$.withoutFadeIn[id] = true;
          });
      };
  
      c3_chart_internal_fn.updateAndRedraw = function (options) {
          var $$ = this,
              config = $$.config,
              transitions;
          options = options || {};
          // same with redraw
          options.withTransition = getOption(options, "withTransition", true);
          options.withTransform = getOption(options, "withTransform", false);
          options.withLegend = getOption(options, "withLegend", false);
          // NOT same with redraw
          options.withUpdateXDomain = true;
          options.withUpdateOrgXDomain = true;
          options.withTransitionForExit = false;
          options.withTransitionForTransform = getOption(options, "withTransitionForTransform", options.withTransition);
          // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)
          $$.updateSizes();
          // MEMO: called in updateLegend in redraw if withLegend
          if (!(options.withLegend && config.legend_show)) {
              transitions = $$.axis.generateTransitions(options.withTransitionForAxis ? config.transition_duration : 0);
              // Update scales
              $$.updateScales();
              $$.updateSvgSize();
              // Update g positions
              $$.transformAll(options.withTransitionForTransform, transitions);
          }
          // Draw with new sizes & scales
          $$.redraw(options, transitions);
      };
      c3_chart_internal_fn.redrawWithoutRescale = function () {
          this.redraw({
              withY: false,
              withSubchart: false,
              withEventRect: false,
              withTransitionForAxis: false
          });
      };
  
      c3_chart_internal_fn.isTimeSeries = function () {
          return this.config.axis_x_type === 'timeseries';
      };
      c3_chart_internal_fn.isCategorized = function () {
          return this.config.axis_x_type.indexOf('categor') >= 0;
      };
      c3_chart_internal_fn.isCustomX = function () {
          var $$ = this,
              config = $$.config;
          return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
      };
  
      c3_chart_internal_fn.isTimeSeriesY = function () {
          return this.config.axis_y_type === 'timeseries';
      };
  
      c3_chart_internal_fn.getTranslate = function (target) {
          var $$ = this,
              config = $$.config,
              x,
              y;
          if (target === 'main') {
              x = asHalfPixel($$.margin.left);
              y = asHalfPixel($$.margin.top);
          } else if (target === 'context') {
              x = asHalfPixel($$.margin2.left);
              y = asHalfPixel($$.margin2.top);
          } else if (target === 'legend') {
              x = $$.margin3.left;
              y = $$.margin3.top;
          } else if (target === 'x') {
              x = 0;
              y = config.axis_rotated ? 0 : $$.height;
          } else if (target === 'y') {
              x = 0;
              y = config.axis_rotated ? $$.height : 0;
          } else if (target === 'y2') {
              x = config.axis_rotated ? 0 : $$.width;
              y = config.axis_rotated ? 1 : 0;
          } else if (target === 'subx') {
              x = 0;
              y = config.axis_rotated ? 0 : $$.height2;
          } else if (target === 'arc') {
              x = $$.arcWidth / 2;
              y = $$.arcHeight / 2 - ($$.hasType('gauge') ? 6 : 0); // to prevent wrong display of min and max label
          }
          return "translate(" + x + "," + y + ")";
      };
      c3_chart_internal_fn.initialOpacity = function (d) {
          return d.value !== null && this.withoutFadeIn[d.id] ? 1 : 0;
      };
      c3_chart_internal_fn.initialOpacityForCircle = function (d) {
          return d.value !== null && this.withoutFadeIn[d.id] ? this.opacityForCircle(d) : 0;
      };
      c3_chart_internal_fn.opacityForCircle = function (d) {
          var isPointShouldBeShown = isFunction(this.config.point_show) ? this.config.point_show(d) : this.config.point_show;
          var opacity = isPointShouldBeShown ? 1 : 0;
          return isValue(d.value) ? this.isScatterType(d) ? 0.5 : opacity : 0;
      };
      c3_chart_internal_fn.opacityForText = function () {
          return this.hasDataLabel() ? 1 : 0;
      };
      c3_chart_internal_fn.xx = function (d) {
          return d ? this.x(d.x) : null;
      };
      c3_chart_internal_fn.xv = function (d) {
          var $$ = this,
              value = d.value;
          if ($$.isTimeSeries()) {
              value = $$.parseDate(d.value);
          } else if ($$.isCategorized() && typeof d.value === 'string') {
              value = $$.config.axis_x_categories.indexOf(d.value);
          }
          return Math.ceil($$.x(value));
      };
      c3_chart_internal_fn.yv = function (d) {
          var $$ = this,
              yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
          return Math.ceil(yScale(d.value));
      };
      c3_chart_internal_fn.subxx = function (d) {
          return d ? this.subX(d.x) : null;
      };
  
      c3_chart_internal_fn.transformMain = function (withTransition, transitions) {
          var $$ = this,
              xAxis,
              yAxis,
              y2Axis;
          if (transitions && transitions.axisX) {
              xAxis = transitions.axisX;
          } else {
              xAxis = $$.main.select('.' + CLASS.axisX);
              if (withTransition) {
                  xAxis = xAxis.transition();
              }
          }
          if (transitions && transitions.axisY) {
              yAxis = transitions.axisY;
          } else {
              yAxis = $$.main.select('.' + CLASS.axisY);
              if (withTransition) {
                  yAxis = yAxis.transition();
              }
          }
          if (transitions && transitions.axisY2) {
              y2Axis = transitions.axisY2;
          } else {
              y2Axis = $$.main.select('.' + CLASS.axisY2);
              if (withTransition) {
                  y2Axis = y2Axis.transition();
              }
          }
          (withTransition ? $$.main.transition() : $$.main).attr("transform", $$.getTranslate('main'));
          xAxis.attr("transform", $$.getTranslate('x'));
          yAxis.attr("transform", $$.getTranslate('y'));
          y2Axis.attr("transform", $$.getTranslate('y2'));
          $$.main.select('.' + CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
      };
      c3_chart_internal_fn.transformAll = function (withTransition, transitions) {
          var $$ = this;
          $$.transformMain(withTransition, transitions);
          if ($$.config.subchart_show) {
              $$.transformContext(withTransition, transitions);
          }
          if ($$.legend) {
              $$.transformLegend(withTransition);
          }
      };
  
      c3_chart_internal_fn.updateSvgSize = function () {
          var $$ = this,
              brush = $$.svg.select(".c3-brush .background");
          $$.svg.attr('width', $$.currentWidth).attr('height', $$.currentHeight);
          $$.svg.selectAll(['#' + $$.clipId, '#' + $$.clipIdForGrid]).select('rect').attr('width', $$.width).attr('height', $$.height);
          $$.svg.select('#' + $$.clipIdForXAxis).select('rect').attr('x', $$.getXAxisClipX.bind($$)).attr('y', $$.getXAxisClipY.bind($$)).attr('width', $$.getXAxisClipWidth.bind($$)).attr('height', $$.getXAxisClipHeight.bind($$));
          $$.svg.select('#' + $$.clipIdForYAxis).select('rect').attr('x', $$.getYAxisClipX.bind($$)).attr('y', $$.getYAxisClipY.bind($$)).attr('width', $$.getYAxisClipWidth.bind($$)).attr('height', $$.getYAxisClipHeight.bind($$));
          $$.svg.select('#' + $$.clipIdForSubchart).select('rect').attr('width', $$.width).attr('height', brush.size() ? brush.attr('height') : 0);
          $$.svg.select('.' + CLASS.zoomRect).attr('width', $$.width).attr('height', $$.height);
          // MEMO: parent div's height will be bigger than svg when <!DOCTYPE html>
          $$.selectChart.style('max-height', $$.currentHeight + "px");
      };
  
      c3_chart_internal_fn.updateDimension = function (withoutAxis) {
          var $$ = this;
          if (!withoutAxis) {
              if ($$.config.axis_rotated) {
                  $$.axes.x.call($$.xAxis);
                  $$.axes.subx.call($$.subXAxis);
              } else {
                  $$.axes.y.call($$.yAxis);
                  $$.axes.y2.call($$.y2Axis);
              }
          }
          $$.updateSizes();
          $$.updateScales();
          $$.updateSvgSize();
          $$.transformAll(false);
      };
  
      c3_chart_internal_fn.observeInserted = function (selection) {
          var $$ = this,
              observer;
          if (typeof MutationObserver === 'undefined') {
              window.console.error("MutationObserver not defined.");
              return;
          }
          observer = new MutationObserver(function (mutations) {
              mutations.forEach(function (mutation) {
                  if (mutation.type === 'childList' && mutation.previousSibling) {
                      observer.disconnect();
                      // need to wait for completion of load because size calculation requires the actual sizes determined after that completion
                      $$.intervalForObserveInserted = window.setInterval(function () {
                          // parentNode will NOT be null when completed
                          if (selection.node().parentNode) {
                              window.clearInterval($$.intervalForObserveInserted);
                              $$.updateDimension();
                              if ($$.brush) {
                                  $$.brush.update();
                              }
                              $$.config.oninit.call($$);
                              $$.redraw({
                                  withTransform: true,
                                  withUpdateXDomain: true,
                                  withUpdateOrgXDomain: true,
                                  withTransition: false,
                                  withTransitionForTransform: false,
                                  withLegend: true
                              });
                              selection.transition().style('opacity', 1);
                          }
                      }, 10);
                  }
              });
          });
          observer.observe(selection.node(), { attributes: true, childList: true, characterData: true });
      };
  
      c3_chart_internal_fn.bindResize = function () {
          var $$ = this,
              config = $$.config;
  
          $$.resizeFunction = $$.generateResize(); // need to call .remove
  
          $$.resizeFunction.add(function () {
              config.onresize.call($$);
          });
          if (config.resize_auto) {
              $$.resizeFunction.add(function () {
                  if ($$.resizeTimeout !== undefined) {
                      window.clearTimeout($$.resizeTimeout);
                  }
                  $$.resizeTimeout = window.setTimeout(function () {
                      delete $$.resizeTimeout;
                      $$.api.flush();
                  }, 100);
              });
          }
          $$.resizeFunction.add(function () {
              config.onresized.call($$);
          });
  
          $$.resizeIfElementDisplayed = function () {
              // if element not displayed skip it
              if ($$.api == null || !$$.api.element.offsetParent) {
                  return;
              }
  
              $$.resizeFunction();
          };
  
          if (window.attachEvent) {
              window.attachEvent('onresize', $$.resizeIfElementDisplayed);
          } else if (window.addEventListener) {
              window.addEventListener('resize', $$.resizeIfElementDisplayed, false);
          } else {
              // fallback to this, if this is a very old browser
              var wrapper = window.onresize;
              if (!wrapper) {
                  // create a wrapper that will call all charts
                  wrapper = $$.generateResize();
              } else if (!wrapper.add || !wrapper.remove) {
                  // there is already a handler registered, make sure we call it too
                  wrapper = $$.generateResize();
                  wrapper.add(window.onresize);
              }
              // add this graph to the wrapper, we will be removed if the user calls destroy
              wrapper.add($$.resizeFunction);
              window.onresize = function () {
                  // if element not displayed skip it
                  if (!$$.api.element.offsetParent) {
                      return;
                  }
  
                  wrapper();
              };
          }
      };
  
      c3_chart_internal_fn.generateResize = function () {
          var resizeFunctions = [];
          function callResizeFunctions() {
              resizeFunctions.forEach(function (f) {
                  f();
              });
          }
          callResizeFunctions.add = function (f) {
              resizeFunctions.push(f);
          };
          callResizeFunctions.remove = function (f) {
              for (var i = 0; i < resizeFunctions.length; i++) {
                  if (resizeFunctions[i] === f) {
                      resizeFunctions.splice(i, 1);
                      break;
                  }
              }
          };
          return callResizeFunctions;
      };
  
      c3_chart_internal_fn.endall = function (transition, callback) {
          var n = 0;
          transition.each(function () {
              ++n;
          }).each("end", function () {
              if (! --n) {
                  callback.apply(this, arguments);
              }
          });
      };
      c3_chart_internal_fn.generateWait = function () {
          var transitionsToWait = [],
              f = function f(transition, callback) {
              var timer = setInterval(function () {
                  var done = 0;
                  transitionsToWait.forEach(function (t) {
                      if (t.empty()) {
                          done += 1;
                          return;
                      }
                      try {
                          t.transition();
                      } catch (e) {
                          done += 1;
                      }
                  });
                  if (done === transitionsToWait.length) {
                      clearInterval(timer);
                      if (callback) {
                          callback();
                      }
                  }
              }, 10);
          };
          f.add = function (transition) {
              transitionsToWait.push(transition);
          };
          return f;
      };
  
      c3_chart_internal_fn.parseDate = function (date) {
          var $$ = this,
              parsedDate;
          if (date instanceof Date) {
              parsedDate = date;
          } else if (typeof date === 'string') {
              parsedDate = $$.dataTimeFormat($$.config.data_xFormat).parse(date);
          } else if ((typeof date === 'undefined' ? 'undefined' : _typeof(date)) === 'object') {
              parsedDate = new Date(+date);
          } else if (typeof date === 'number' && !isNaN(date)) {
              parsedDate = new Date(+date);
          }
          if (!parsedDate || isNaN(+parsedDate)) {
              window.console.error("Failed to parse x '" + date + "' to Date object");
          }
          return parsedDate;
      };
  
      c3_chart_internal_fn.isTabVisible = function () {
          var hidden;
          if (typeof document.hidden !== "undefined") {
              // Opera 12.10 and Firefox 18 and later support
              hidden = "hidden";
          } else if (typeof document.mozHidden !== "undefined") {
              hidden = "mozHidden";
          } else if (typeof document.msHidden !== "undefined") {
              hidden = "msHidden";
          } else if (typeof document.webkitHidden !== "undefined") {
              hidden = "webkitHidden";
          }
  
          return document[hidden] ? false : true;
      };
  
      c3_chart_internal_fn.isValue = isValue;
      c3_chart_internal_fn.isFunction = isFunction;
      c3_chart_internal_fn.isString = isString;
      c3_chart_internal_fn.isUndefined = isUndefined;
      c3_chart_internal_fn.isDefined = isDefined;
      c3_chart_internal_fn.ceil10 = ceil10;
      c3_chart_internal_fn.asHalfPixel = asHalfPixel;
      c3_chart_internal_fn.diffDomain = diffDomain;
      c3_chart_internal_fn.isEmpty = isEmpty;
      c3_chart_internal_fn.notEmpty = notEmpty;
      c3_chart_internal_fn.notEmpty = notEmpty;
      c3_chart_internal_fn.getOption = getOption;
      c3_chart_internal_fn.hasValue = hasValue;
      c3_chart_internal_fn.sanitise = sanitise;
      c3_chart_internal_fn.getPathBox = getPathBox;
      c3_chart_internal_fn.CLASS = CLASS;
  
      /* jshint ignore:start */
  
      // PhantomJS doesn't have support for Function.prototype.bind, which has caused confusion. Use
      // this polyfill to avoid the confusion.
      // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind#Polyfill
  
      if (!Function.prototype.bind) {
          Function.prototype.bind = function (oThis) {
              if (typeof this !== 'function') {
                  // closest thing possible to the ECMAScript 5
                  // internal IsCallable function
                  throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
              }
  
              var aArgs = Array.prototype.slice.call(arguments, 1),
                  fToBind = this,
                  fNOP = function fNOP() {},
                  fBound = function fBound() {
                  return fToBind.apply(this instanceof fNOP ? this : oThis, aArgs.concat(Array.prototype.slice.call(arguments)));
              };
  
              fNOP.prototype = this.prototype;
              fBound.prototype = new fNOP();
  
              return fBound;
          };
      }
  
      // SVGPathSeg API polyfill
      // https://github.com/progers/pathseg
      //
      // This is a drop-in replacement for the SVGPathSeg and SVGPathSegList APIs that were removed from
      // SVG2 (https://lists.w3.org/Archives/Public/www-svg/2015Jun/0044.html), including the latest spec
      // changes which were implemented in Firefox 43 and Chrome 46.
  
      (function () {
  
          if (!("SVGPathSeg" in window)) {
              // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg
              window.SVGPathSeg = function (type, typeAsLetter, owningPathSegList) {
                  this.pathSegType = type;
                  this.pathSegTypeAsLetter = typeAsLetter;
                  this._owningPathSegList = owningPathSegList;
              };
  
              window.SVGPathSeg.prototype.classname = "SVGPathSeg";
  
              window.SVGPathSeg.PATHSEG_UNKNOWN = 0;
              window.SVGPathSeg.PATHSEG_CLOSEPATH = 1;
              window.SVGPathSeg.PATHSEG_MOVETO_ABS = 2;
              window.SVGPathSeg.PATHSEG_MOVETO_REL = 3;
              window.SVGPathSeg.PATHSEG_LINETO_ABS = 4;
              window.SVGPathSeg.PATHSEG_LINETO_REL = 5;
              window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6;
              window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7;
              window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8;
              window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9;
              window.SVGPathSeg.PATHSEG_ARC_ABS = 10;
              window.SVGPathSeg.PATHSEG_ARC_REL = 11;
              window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12;
              window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13;
              window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14;
              window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15;
              window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
              window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
              window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
              window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;
  
              // Notify owning PathSegList on any changes so they can be synchronized back to the path element.
              window.SVGPathSeg.prototype._segmentChanged = function () {
                  if (this._owningPathSegList) this._owningPathSegList.segmentChanged(this);
              };
  
              window.SVGPathSegClosePath = function (owningPathSegList) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CLOSEPATH, "z", owningPathSegList);
              };
              window.SVGPathSegClosePath.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegClosePath.prototype.toString = function () {
                  return "[object SVGPathSegClosePath]";
              };
              window.SVGPathSegClosePath.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter;
              };
              window.SVGPathSegClosePath.prototype.clone = function () {
                  return new window.SVGPathSegClosePath(undefined);
              };
  
              window.SVGPathSegMovetoAbs = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_ABS, "M", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegMovetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegMovetoAbs.prototype.toString = function () {
                  return "[object SVGPathSegMovetoAbs]";
              };
              window.SVGPathSegMovetoAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegMovetoAbs.prototype.clone = function () {
                  return new window.SVGPathSegMovetoAbs(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegMovetoRel = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_REL, "m", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegMovetoRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegMovetoRel.prototype.toString = function () {
                  return "[object SVGPathSegMovetoRel]";
              };
              window.SVGPathSegMovetoRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegMovetoRel.prototype.clone = function () {
                  return new window.SVGPathSegMovetoRel(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoAbs = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_ABS, "L", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegLinetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoAbs.prototype.toString = function () {
                  return "[object SVGPathSegLinetoAbs]";
              };
              window.SVGPathSegLinetoAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegLinetoAbs.prototype.clone = function () {
                  return new window.SVGPathSegLinetoAbs(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoRel = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_REL, "l", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegLinetoRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoRel.prototype.toString = function () {
                  return "[object SVGPathSegLinetoRel]";
              };
              window.SVGPathSegLinetoRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegLinetoRel.prototype.clone = function () {
                  return new window.SVGPathSegLinetoRel(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoCubicAbs = function (owningPathSegList, x, y, x1, y1, x2, y2) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS, "C", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x1 = x1;
                  this._y1 = y1;
                  this._x2 = x2;
                  this._y2 = y2;
              };
              window.SVGPathSegCurvetoCubicAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoCubicAbs.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoCubicAbs]";
              };
              window.SVGPathSegCurvetoCubicAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoCubicAbs.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoCubicAbs(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
              };
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x1", { get: function get() {
                      return this._x1;
                  }, set: function set(x1) {
                      this._x1 = x1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y1", { get: function get() {
                      return this._y1;
                  }, set: function set(y1) {
                      this._y1 = y1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x2", { get: function get() {
                      return this._x2;
                  }, set: function set(x2) {
                      this._x2 = x2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y2", { get: function get() {
                      return this._y2;
                  }, set: function set(y2) {
                      this._y2 = y2;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoCubicRel = function (owningPathSegList, x, y, x1, y1, x2, y2) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL, "c", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x1 = x1;
                  this._y1 = y1;
                  this._x2 = x2;
                  this._y2 = y2;
              };
              window.SVGPathSegCurvetoCubicRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoCubicRel.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoCubicRel]";
              };
              window.SVGPathSegCurvetoCubicRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoCubicRel.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoCubicRel(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
              };
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x1", { get: function get() {
                      return this._x1;
                  }, set: function set(x1) {
                      this._x1 = x1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y1", { get: function get() {
                      return this._y1;
                  }, set: function set(y1) {
                      this._y1 = y1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x2", { get: function get() {
                      return this._x2;
                  }, set: function set(x2) {
                      this._x2 = x2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y2", { get: function get() {
                      return this._y2;
                  }, set: function set(y2) {
                      this._y2 = y2;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoQuadraticAbs = function (owningPathSegList, x, y, x1, y1) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS, "Q", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x1 = x1;
                  this._y1 = y1;
              };
              window.SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoQuadraticAbs.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoQuadraticAbs]";
              };
              window.SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoQuadraticAbs.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoQuadraticAbs(undefined, this._x, this._y, this._x1, this._y1);
              };
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x1", { get: function get() {
                      return this._x1;
                  }, set: function set(x1) {
                      this._x1 = x1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y1", { get: function get() {
                      return this._y1;
                  }, set: function set(y1) {
                      this._y1 = y1;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoQuadraticRel = function (owningPathSegList, x, y, x1, y1) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL, "q", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x1 = x1;
                  this._y1 = y1;
              };
              window.SVGPathSegCurvetoQuadraticRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoQuadraticRel.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoQuadraticRel]";
              };
              window.SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoQuadraticRel.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoQuadraticRel(undefined, this._x, this._y, this._x1, this._y1);
              };
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x1", { get: function get() {
                      return this._x1;
                  }, set: function set(x1) {
                      this._x1 = x1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y1", { get: function get() {
                      return this._y1;
                  }, set: function set(y1) {
                      this._y1 = y1;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegArcAbs = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_ABS, "A", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._r1 = r1;
                  this._r2 = r2;
                  this._angle = angle;
                  this._largeArcFlag = largeArcFlag;
                  this._sweepFlag = sweepFlag;
              };
              window.SVGPathSegArcAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegArcAbs.prototype.toString = function () {
                  return "[object SVGPathSegArcAbs]";
              };
              window.SVGPathSegArcAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
              };
              window.SVGPathSegArcAbs.prototype.clone = function () {
                  return new window.SVGPathSegArcAbs(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
              };
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r1", { get: function get() {
                      return this._r1;
                  }, set: function set(r1) {
                      this._r1 = r1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r2", { get: function get() {
                      return this._r2;
                  }, set: function set(r2) {
                      this._r2 = r2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "angle", { get: function get() {
                      return this._angle;
                  }, set: function set(angle) {
                      this._angle = angle;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "largeArcFlag", { get: function get() {
                      return this._largeArcFlag;
                  }, set: function set(largeArcFlag) {
                      this._largeArcFlag = largeArcFlag;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcAbs.prototype, "sweepFlag", { get: function get() {
                      return this._sweepFlag;
                  }, set: function set(sweepFlag) {
                      this._sweepFlag = sweepFlag;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegArcRel = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_REL, "a", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._r1 = r1;
                  this._r2 = r2;
                  this._angle = angle;
                  this._largeArcFlag = largeArcFlag;
                  this._sweepFlag = sweepFlag;
              };
              window.SVGPathSegArcRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegArcRel.prototype.toString = function () {
                  return "[object SVGPathSegArcRel]";
              };
              window.SVGPathSegArcRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
              };
              window.SVGPathSegArcRel.prototype.clone = function () {
                  return new window.SVGPathSegArcRel(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
              };
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "r1", { get: function get() {
                      return this._r1;
                  }, set: function set(r1) {
                      this._r1 = r1;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "r2", { get: function get() {
                      return this._r2;
                  }, set: function set(r2) {
                      this._r2 = r2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "angle", { get: function get() {
                      return this._angle;
                  }, set: function set(angle) {
                      this._angle = angle;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "largeArcFlag", { get: function get() {
                      return this._largeArcFlag;
                  }, set: function set(largeArcFlag) {
                      this._largeArcFlag = largeArcFlag;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegArcRel.prototype, "sweepFlag", { get: function get() {
                      return this._sweepFlag;
                  }, set: function set(sweepFlag) {
                      this._sweepFlag = sweepFlag;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoHorizontalAbs = function (owningPathSegList, x) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS, "H", owningPathSegList);
                  this._x = x;
              };
              window.SVGPathSegLinetoHorizontalAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoHorizontalAbs.prototype.toString = function () {
                  return "[object SVGPathSegLinetoHorizontalAbs]";
              };
              window.SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x;
              };
              window.SVGPathSegLinetoHorizontalAbs.prototype.clone = function () {
                  return new window.SVGPathSegLinetoHorizontalAbs(undefined, this._x);
              };
              Object.defineProperty(window.SVGPathSegLinetoHorizontalAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoHorizontalRel = function (owningPathSegList, x) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL, "h", owningPathSegList);
                  this._x = x;
              };
              window.SVGPathSegLinetoHorizontalRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoHorizontalRel.prototype.toString = function () {
                  return "[object SVGPathSegLinetoHorizontalRel]";
              };
              window.SVGPathSegLinetoHorizontalRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x;
              };
              window.SVGPathSegLinetoHorizontalRel.prototype.clone = function () {
                  return new window.SVGPathSegLinetoHorizontalRel(undefined, this._x);
              };
              Object.defineProperty(window.SVGPathSegLinetoHorizontalRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoVerticalAbs = function (owningPathSegList, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS, "V", owningPathSegList);
                  this._y = y;
              };
              window.SVGPathSegLinetoVerticalAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoVerticalAbs.prototype.toString = function () {
                  return "[object SVGPathSegLinetoVerticalAbs]";
              };
              window.SVGPathSegLinetoVerticalAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._y;
              };
              window.SVGPathSegLinetoVerticalAbs.prototype.clone = function () {
                  return new window.SVGPathSegLinetoVerticalAbs(undefined, this._y);
              };
              Object.defineProperty(window.SVGPathSegLinetoVerticalAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegLinetoVerticalRel = function (owningPathSegList, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL, "v", owningPathSegList);
                  this._y = y;
              };
              window.SVGPathSegLinetoVerticalRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegLinetoVerticalRel.prototype.toString = function () {
                  return "[object SVGPathSegLinetoVerticalRel]";
              };
              window.SVGPathSegLinetoVerticalRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._y;
              };
              window.SVGPathSegLinetoVerticalRel.prototype.clone = function () {
                  return new window.SVGPathSegLinetoVerticalRel(undefined, this._y);
              };
              Object.defineProperty(window.SVGPathSegLinetoVerticalRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoCubicSmoothAbs = function (owningPathSegList, x, y, x2, y2) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS, "S", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x2 = x2;
                  this._y2 = y2;
              };
              window.SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoCubicSmoothAbs]";
              };
              window.SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, this._x, this._y, this._x2, this._y2);
              };
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x2", { get: function get() {
                      return this._x2;
                  }, set: function set(x2) {
                      this._x2 = x2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y2", { get: function get() {
                      return this._y2;
                  }, set: function set(y2) {
                      this._y2 = y2;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoCubicSmoothRel = function (owningPathSegList, x, y, x2, y2) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL, "s", owningPathSegList);
                  this._x = x;
                  this._y = y;
                  this._x2 = x2;
                  this._y2 = y2;
              };
              window.SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoCubicSmoothRel]";
              };
              window.SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, this._x, this._y, this._x2, this._y2);
              };
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x2", { get: function get() {
                      return this._x2;
                  }, set: function set(x2) {
                      this._x2 = x2;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y2", { get: function get() {
                      return this._y2;
                  }, set: function set(y2) {
                      this._y2 = y2;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoQuadraticSmoothAbs = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS, "T", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoQuadraticSmoothAbs]";
              };
              window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              window.SVGPathSegCurvetoQuadraticSmoothRel = function (owningPathSegList, x, y) {
                  window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL, "t", owningPathSegList);
                  this._x = x;
                  this._y = y;
              };
              window.SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);
              window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function () {
                  return "[object SVGPathSegCurvetoQuadraticSmoothRel]";
              };
              window.SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function () {
                  return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
              };
              window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function () {
                  return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, this._x, this._y);
              };
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "x", { get: function get() {
                      return this._x;
                  }, set: function set(x) {
                      this._x = x;this._segmentChanged();
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "y", { get: function get() {
                      return this._y;
                  }, set: function set(y) {
                      this._y = y;this._segmentChanged();
                  }, enumerable: true });
  
              // Add createSVGPathSeg* functions to window.SVGPathElement.
              // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-Interfacewindow.SVGPathElement.
              window.SVGPathElement.prototype.createSVGPathSegClosePath = function () {
                  return new window.SVGPathSegClosePath(undefined);
              };
              window.SVGPathElement.prototype.createSVGPathSegMovetoAbs = function (x, y) {
                  return new window.SVGPathSegMovetoAbs(undefined, x, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegMovetoRel = function (x, y) {
                  return new window.SVGPathSegMovetoRel(undefined, x, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoAbs = function (x, y) {
                  return new window.SVGPathSegLinetoAbs(undefined, x, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoRel = function (x, y) {
                  return new window.SVGPathSegLinetoRel(undefined, x, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function (x, y, x1, y1, x2, y2) {
                  return new window.SVGPathSegCurvetoCubicAbs(undefined, x, y, x1, y1, x2, y2);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function (x, y, x1, y1, x2, y2) {
                  return new window.SVGPathSegCurvetoCubicRel(undefined, x, y, x1, y1, x2, y2);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function (x, y, x1, y1) {
                  return new window.SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function (x, y, x1, y1) {
                  return new window.SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1);
              };
              window.SVGPathElement.prototype.createSVGPathSegArcAbs = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                  return new window.SVGPathSegArcAbs(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
              };
              window.SVGPathElement.prototype.createSVGPathSegArcRel = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
                  return new window.SVGPathSegArcRel(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function (x) {
                  return new window.SVGPathSegLinetoHorizontalAbs(undefined, x);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function (x) {
                  return new window.SVGPathSegLinetoHorizontalRel(undefined, x);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function (y) {
                  return new window.SVGPathSegLinetoVerticalAbs(undefined, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function (y) {
                  return new window.SVGPathSegLinetoVerticalRel(undefined, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function (x, y, x2, y2) {
                  return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function (x, y, x2, y2) {
                  return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function (x, y) {
                  return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y);
              };
              window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function (x, y) {
                  return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y);
              };
  
              if (!("getPathSegAtLength" in window.SVGPathElement.prototype)) {
                  // Add getPathSegAtLength to SVGPathElement.
                  // Spec: https://www.w3.org/TR/SVG11/single-page.html#paths-__svg__SVGPathElement__getPathSegAtLength
                  // This polyfill requires SVGPathElement.getTotalLength to implement the distance-along-a-path algorithm.
                  window.SVGPathElement.prototype.getPathSegAtLength = function (distance) {
                      if (distance === undefined || !isFinite(distance)) throw "Invalid arguments.";
  
                      var measurementElement = document.createElementNS("http://www.w3.org/2000/svg", "path");
                      measurementElement.setAttribute("d", this.getAttribute("d"));
                      var lastPathSegment = measurementElement.pathSegList.numberOfItems - 1;
  
                      // If the path is empty, return 0.
                      if (lastPathSegment <= 0) return 0;
  
                      do {
                          measurementElement.pathSegList.removeItem(lastPathSegment);
                          if (distance > measurementElement.getTotalLength()) break;
                          lastPathSegment--;
                      } while (lastPathSegment > 0);
                      return lastPathSegment;
                  };
              }
          }
  
          if (!("SVGPathSegList" in window)) {
              // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList
              window.SVGPathSegList = function (pathElement) {
                  this._pathElement = pathElement;
                  this._list = this._parsePath(this._pathElement.getAttribute("d"));
  
                  // Use a MutationObserver to catch changes to the path's "d" attribute.
                  this._mutationObserverConfig = { "attributes": true, "attributeFilter": ["d"] };
                  this._pathElementMutationObserver = new MutationObserver(this._updateListFromPathMutations.bind(this));
                  this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
              };
  
              window.SVGPathSegList.prototype.classname = "SVGPathSegList";
  
              Object.defineProperty(window.SVGPathSegList.prototype, "numberOfItems", {
                  get: function get() {
                      this._checkPathSynchronizedToList();
                      return this._list.length;
                  },
                  enumerable: true
              });
  
              // Add the pathSegList accessors to window.SVGPathElement.
              // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData
              Object.defineProperty(window.SVGPathElement.prototype, "pathSegList", {
                  get: function get() {
                      if (!this._pathSegList) this._pathSegList = new window.SVGPathSegList(this);
                      return this._pathSegList;
                  },
                  enumerable: true
              });
              // FIXME: The following are not implemented and simply return window.SVGPathElement.pathSegList.
              Object.defineProperty(window.SVGPathElement.prototype, "normalizedPathSegList", { get: function get() {
                      return this.pathSegList;
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathElement.prototype, "animatedPathSegList", { get: function get() {
                      return this.pathSegList;
                  }, enumerable: true });
              Object.defineProperty(window.SVGPathElement.prototype, "animatedNormalizedPathSegList", { get: function get() {
                      return this.pathSegList;
                  }, enumerable: true });
  
              // Process any pending mutations to the path element and update the list as needed.
              // This should be the first call of all public functions and is needed because
              // MutationObservers are not synchronous so we can have pending asynchronous mutations.
              window.SVGPathSegList.prototype._checkPathSynchronizedToList = function () {
                  this._updateListFromPathMutations(this._pathElementMutationObserver.takeRecords());
              };
  
              window.SVGPathSegList.prototype._updateListFromPathMutations = function (mutationRecords) {
                  if (!this._pathElement) return;
                  var hasPathMutations = false;
                  mutationRecords.forEach(function (record) {
                      if (record.attributeName == "d") hasPathMutations = true;
                  });
                  if (hasPathMutations) this._list = this._parsePath(this._pathElement.getAttribute("d"));
              };
  
              // Serialize the list and update the path's 'd' attribute.
              window.SVGPathSegList.prototype._writeListToPath = function () {
                  this._pathElementMutationObserver.disconnect();
                  this._pathElement.setAttribute("d", window.SVGPathSegList._pathSegArrayAsString(this._list));
                  this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
              };
  
              // When a path segment changes the list needs to be synchronized back to the path element.
              window.SVGPathSegList.prototype.segmentChanged = function (pathSeg) {
                  this._writeListToPath();
              };
  
              window.SVGPathSegList.prototype.clear = function () {
                  this._checkPathSynchronizedToList();
  
                  this._list.forEach(function (pathSeg) {
                      pathSeg._owningPathSegList = null;
                  });
                  this._list = [];
                  this._writeListToPath();
              };
  
              window.SVGPathSegList.prototype.initialize = function (newItem) {
                  this._checkPathSynchronizedToList();
  
                  this._list = [newItem];
                  newItem._owningPathSegList = this;
                  this._writeListToPath();
                  return newItem;
              };
  
              window.SVGPathSegList.prototype._checkValidIndex = function (index) {
                  if (isNaN(index) || index < 0 || index >= this.numberOfItems) throw "INDEX_SIZE_ERR";
              };
  
              window.SVGPathSegList.prototype.getItem = function (index) {
                  this._checkPathSynchronizedToList();
  
                  this._checkValidIndex(index);
                  return this._list[index];
              };
  
              window.SVGPathSegList.prototype.insertItemBefore = function (newItem, index) {
                  this._checkPathSynchronizedToList();
  
                  // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.
                  if (index > this.numberOfItems) index = this.numberOfItems;
                  if (newItem._owningPathSegList) {
                      // SVG2 spec says to make a copy.
                      newItem = newItem.clone();
                  }
                  this._list.splice(index, 0, newItem);
                  newItem._owningPathSegList = this;
                  this._writeListToPath();
                  return newItem;
              };
  
              window.SVGPathSegList.prototype.replaceItem = function (newItem, index) {
                  this._checkPathSynchronizedToList();
  
                  if (newItem._owningPathSegList) {
                      // SVG2 spec says to make a copy.
                      newItem = newItem.clone();
                  }
                  this._checkValidIndex(index);
                  this._list[index] = newItem;
                  newItem._owningPathSegList = this;
                  this._writeListToPath();
                  return newItem;
              };
  
              window.SVGPathSegList.prototype.removeItem = function (index) {
                  this._checkPathSynchronizedToList();
  
                  this._checkValidIndex(index);
                  var item = this._list[index];
                  this._list.splice(index, 1);
                  this._writeListToPath();
                  return item;
              };
  
              window.SVGPathSegList.prototype.appendItem = function (newItem) {
                  this._checkPathSynchronizedToList();
  
                  if (newItem._owningPathSegList) {
                      // SVG2 spec says to make a copy.
                      newItem = newItem.clone();
                  }
                  this._list.push(newItem);
                  newItem._owningPathSegList = this;
                  // TODO: Optimize this to just append to the existing attribute.
                  this._writeListToPath();
                  return newItem;
              };
  
              window.SVGPathSegList._pathSegArrayAsString = function (pathSegArray) {
                  var string = "";
                  var first = true;
                  pathSegArray.forEach(function (pathSeg) {
                      if (first) {
                          first = false;
                          string += pathSeg._asPathString();
                      } else {
                          string += " " + pathSeg._asPathString();
                      }
                  });
                  return string;
              };
  
              // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.
              window.SVGPathSegList.prototype._parsePath = function (string) {
                  if (!string || string.length == 0) return [];
  
                  var owningPathSegList = this;
  
                  var Builder = function Builder() {
                      this.pathSegList = [];
                  };
  
                  Builder.prototype.appendSegment = function (pathSeg) {
                      this.pathSegList.push(pathSeg);
                  };
  
                  var Source = function Source(string) {
                      this._string = string;
                      this._currentIndex = 0;
                      this._endIndex = this._string.length;
                      this._previousCommand = window.SVGPathSeg.PATHSEG_UNKNOWN;
  
                      this._skipOptionalSpaces();
                  };
  
                  Source.prototype._isCurrentSpace = function () {
                      var character = this._string[this._currentIndex];
                      return character <= " " && (character == " " || character == "\n" || character == "\t" || character == "\r" || character == "\f");
                  };
  
                  Source.prototype._skipOptionalSpaces = function () {
                      while (this._currentIndex < this._endIndex && this._isCurrentSpace()) {
                          this._currentIndex++;
                      }return this._currentIndex < this._endIndex;
                  };
  
                  Source.prototype._skipOptionalSpacesOrDelimiter = function () {
                      if (this._currentIndex < this._endIndex && !this._isCurrentSpace() && this._string.charAt(this._currentIndex) != ",") return false;
                      if (this._skipOptionalSpaces()) {
                          if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ",") {
                              this._currentIndex++;
                              this._skipOptionalSpaces();
                          }
                      }
                      return this._currentIndex < this._endIndex;
                  };
  
                  Source.prototype.hasMoreData = function () {
                      return this._currentIndex < this._endIndex;
                  };
  
                  Source.prototype.peekSegmentType = function () {
                      var lookahead = this._string[this._currentIndex];
                      return this._pathSegTypeFromChar(lookahead);
                  };
  
                  Source.prototype._pathSegTypeFromChar = function (lookahead) {
                      switch (lookahead) {
                          case "Z":
                          case "z":
                              return window.SVGPathSeg.PATHSEG_CLOSEPATH;
                          case "M":
                              return window.SVGPathSeg.PATHSEG_MOVETO_ABS;
                          case "m":
                              return window.SVGPathSeg.PATHSEG_MOVETO_REL;
                          case "L":
                              return window.SVGPathSeg.PATHSEG_LINETO_ABS;
                          case "l":
                              return window.SVGPathSeg.PATHSEG_LINETO_REL;
                          case "C":
                              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS;
                          case "c":
                              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL;
                          case "Q":
                              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS;
                          case "q":
                              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL;
                          case "A":
                              return window.SVGPathSeg.PATHSEG_ARC_ABS;
                          case "a":
                              return window.SVGPathSeg.PATHSEG_ARC_REL;
                          case "H":
                              return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS;
                          case "h":
                              return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL;
                          case "V":
                              return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS;
                          case "v":
                              return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL;
                          case "S":
                              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS;
                          case "s":
                              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL;
                          case "T":
                              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS;
                          case "t":
                              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL;
                          default:
                              return window.SVGPathSeg.PATHSEG_UNKNOWN;
                      }
                  };
  
                  Source.prototype._nextCommandHelper = function (lookahead, previousCommand) {
                      // Check for remaining coordinates in the current command.
                      if ((lookahead == "+" || lookahead == "-" || lookahead == "." || lookahead >= "0" && lookahead <= "9") && previousCommand != window.SVGPathSeg.PATHSEG_CLOSEPATH) {
                          if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_ABS) return window.SVGPathSeg.PATHSEG_LINETO_ABS;
                          if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_REL) return window.SVGPathSeg.PATHSEG_LINETO_REL;
                          return previousCommand;
                      }
                      return window.SVGPathSeg.PATHSEG_UNKNOWN;
                  };
  
                  Source.prototype.initialCommandIsMoveTo = function () {
                      // If the path is empty it is still valid, so return true.
                      if (!this.hasMoreData()) return true;
                      var command = this.peekSegmentType();
                      // Path must start with moveTo.
                      return command == window.SVGPathSeg.PATHSEG_MOVETO_ABS || command == window.SVGPathSeg.PATHSEG_MOVETO_REL;
                  };
  
                  // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.
                  // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF
                  Source.prototype._parseNumber = function () {
                      var exponent = 0;
                      var integer = 0;
                      var frac = 1;
                      var decimal = 0;
                      var sign = 1;
                      var expsign = 1;
  
                      var startIndex = this._currentIndex;
  
                      this._skipOptionalSpaces();
  
                      // Read the sign.
                      if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "+") this._currentIndex++;else if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "-") {
                          this._currentIndex++;
                          sign = -1;
                      }
  
                      if (this._currentIndex == this._endIndex || (this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") && this._string.charAt(this._currentIndex) != ".")
                          // The first character of a number must be one of [0-9+-.].
                          return undefined;
  
                      // Read the integer part, build right-to-left.
                      var startIntPartIndex = this._currentIndex;
                      while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                          this._currentIndex++;
                      } // Advance to first non-digit.
  
                      if (this._currentIndex != startIntPartIndex) {
                          var scanIntPartIndex = this._currentIndex - 1;
                          var multiplier = 1;
                          while (scanIntPartIndex >= startIntPartIndex) {
                              integer += multiplier * (this._string.charAt(scanIntPartIndex--) - "0");
                              multiplier *= 10;
                          }
                      }
  
                      // Read the decimals.
                      if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ".") {
                          this._currentIndex++;
  
                          // There must be a least one digit following the .
                          if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;
                          while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                              frac *= 10;
                              decimal += (this._string.charAt(this._currentIndex) - "0") / frac;
                              this._currentIndex += 1;
                          }
                      }
  
                      // Read the exponent part.
                      if (this._currentIndex != startIndex && this._currentIndex + 1 < this._endIndex && (this._string.charAt(this._currentIndex) == "e" || this._string.charAt(this._currentIndex) == "E") && this._string.charAt(this._currentIndex + 1) != "x" && this._string.charAt(this._currentIndex + 1) != "m") {
                          this._currentIndex++;
  
                          // Read the sign of the exponent.
                          if (this._string.charAt(this._currentIndex) == "+") {
                              this._currentIndex++;
                          } else if (this._string.charAt(this._currentIndex) == "-") {
                              this._currentIndex++;
                              expsign = -1;
                          }
  
                          // There must be an exponent.
                          if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;
  
                          while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
                              exponent *= 10;
                              exponent += this._string.charAt(this._currentIndex) - "0";
                              this._currentIndex++;
                          }
                      }
  
                      var number = integer + decimal;
                      number *= sign;
  
                      if (exponent) number *= Math.pow(10, expsign * exponent);
  
                      if (startIndex == this._currentIndex) return undefined;
  
                      this._skipOptionalSpacesOrDelimiter();
  
                      return number;
                  };
  
                  Source.prototype._parseArcFlag = function () {
                      if (this._currentIndex >= this._endIndex) return undefined;
                      var flag = false;
                      var flagChar = this._string.charAt(this._currentIndex++);
                      if (flagChar == "0") flag = false;else if (flagChar == "1") flag = true;else return undefined;
  
                      this._skipOptionalSpacesOrDelimiter();
                      return flag;
                  };
  
                  Source.prototype.parseSegment = function () {
                      var lookahead = this._string[this._currentIndex];
                      var command = this._pathSegTypeFromChar(lookahead);
                      if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) {
                          // Possibly an implicit command. Not allowed if this is the first command.
                          if (this._previousCommand == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
                          command = this._nextCommandHelper(lookahead, this._previousCommand);
                          if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
                      } else {
                          this._currentIndex++;
                      }
  
                      this._previousCommand = command;
  
                      switch (command) {
                          case window.SVGPathSeg.PATHSEG_MOVETO_REL:
                              return new window.SVGPathSegMovetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_MOVETO_ABS:
                              return new window.SVGPathSegMovetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_REL:
                              return new window.SVGPathSegLinetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_ABS:
                              return new window.SVGPathSegLinetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:
                              return new window.SVGPathSegLinetoHorizontalRel(owningPathSegList, this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:
                              return new window.SVGPathSegLinetoHorizontalAbs(owningPathSegList, this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:
                              return new window.SVGPathSegLinetoVerticalRel(owningPathSegList, this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:
                              return new window.SVGPathSegLinetoVerticalAbs(owningPathSegList, this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_CLOSEPATH:
                              this._skipOptionalSpaces();
                              return new window.SVGPathSegClosePath(owningPathSegList);
                          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoCubicRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
                          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoCubicAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
                          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
                              var points = { x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoCubicSmoothRel(owningPathSegList, points.x, points.y, points.x2, points.y2);
                          case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
                              var points = { x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoCubicSmoothAbs(owningPathSegList, points.x, points.y, points.x2, points.y2);
                          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoQuadraticRel(owningPathSegList, points.x, points.y, points.x1, points.y1);
                          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegCurvetoQuadraticAbs(owningPathSegList, points.x, points.y, points.x1, points.y1);
                          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
                              return new window.SVGPathSegCurvetoQuadraticSmoothRel(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
                              return new window.SVGPathSegCurvetoQuadraticSmoothAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
                          case window.SVGPathSeg.PATHSEG_ARC_REL:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegArcRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
                          case window.SVGPathSeg.PATHSEG_ARC_ABS:
                              var points = { x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber() };
                              return new window.SVGPathSegArcAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
                          default:
                              throw "Unknown path seg type.";
                      }
                  };
  
                  var builder = new Builder();
                  var source = new Source(string);
  
                  if (!source.initialCommandIsMoveTo()) return [];
                  while (source.hasMoreData()) {
                      var pathSeg = source.parseSegment();
                      if (!pathSeg) return [];
                      builder.appendSegment(pathSeg);
                  }
  
                  return builder.pathSegList;
              };
          }
      })();
  
      // String.padEnd polyfill for IE11
      //
      // https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
      // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd
      if (!String.prototype.padEnd) {
          String.prototype.padEnd = function padEnd(targetLength, padString) {
              targetLength = targetLength >> 0; //floor if number or convert non-number to 0;
              padString = String(typeof padString !== 'undefined' ? padString : ' ');
              if (this.length > targetLength) {
                  return String(this);
              } else {
                  targetLength = targetLength - this.length;
                  if (targetLength > padString.length) {
                      padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
                  }
                  return String(this) + padString.slice(0, targetLength);
              }
          };
      }
  
      /* jshint ignore:end */
  
      c3_chart_fn.axis = function () {};
      c3_chart_fn.axis.labels = function (labels) {
          var $$ = this.internal;
          if (arguments.length) {
              Object.keys(labels).forEach(function (axisId) {
                  $$.axis.setLabelText(axisId, labels[axisId]);
              });
              $$.axis.updateLabels();
          }
          // TODO: return some values?
      };
      c3_chart_fn.axis.max = function (max) {
          var $$ = this.internal,
              config = $$.config;
          if (arguments.length) {
              if ((typeof max === 'undefined' ? 'undefined' : _typeof(max)) === 'object') {
                  if (isValue(max.x)) {
                      config.axis_x_max = max.x;
                  }
                  if (isValue(max.y)) {
                      config.axis_y_max = max.y;
                  }
                  if (isValue(max.y2)) {
                      config.axis_y2_max = max.y2;
                  }
              } else {
                  config.axis_y_max = config.axis_y2_max = max;
              }
              $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
          } else {
              return {
                  x: config.axis_x_max,
                  y: config.axis_y_max,
                  y2: config.axis_y2_max
              };
          }
      };
      c3_chart_fn.axis.min = function (min) {
          var $$ = this.internal,
              config = $$.config;
          if (arguments.length) {
              if ((typeof min === 'undefined' ? 'undefined' : _typeof(min)) === 'object') {
                  if (isValue(min.x)) {
                      config.axis_x_min = min.x;
                  }
                  if (isValue(min.y)) {
                      config.axis_y_min = min.y;
                  }
                  if (isValue(min.y2)) {
                      config.axis_y2_min = min.y2;
                  }
              } else {
                  config.axis_y_min = config.axis_y2_min = min;
              }
              $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
          } else {
              return {
                  x: config.axis_x_min,
                  y: config.axis_y_min,
                  y2: config.axis_y2_min
              };
          }
      };
      c3_chart_fn.axis.range = function (range) {
          if (arguments.length) {
              if (isDefined(range.max)) {
                  this.axis.max(range.max);
              }
              if (isDefined(range.min)) {
                  this.axis.min(range.min);
              }
          } else {
              return {
                  max: this.axis.max(),
                  min: this.axis.min()
              };
          }
      };
  
      c3_chart_fn.category = function (i, category) {
          var $$ = this.internal,
              config = $$.config;
          if (arguments.length > 1) {
              config.axis_x_categories[i] = category;
              $$.redraw();
          }
          return config.axis_x_categories[i];
      };
      c3_chart_fn.categories = function (categories) {
          var $$ = this.internal,
              config = $$.config;
          if (!arguments.length) {
              return config.axis_x_categories;
          }
          config.axis_x_categories = categories;
          $$.redraw();
          return config.axis_x_categories;
      };
  
      c3_chart_fn.resize = function (size) {
          var $$ = this.internal,
              config = $$.config;
          config.size_width = size ? size.width : null;
          config.size_height = size ? size.height : null;
          this.flush();
      };
  
      c3_chart_fn.flush = function () {
          var $$ = this.internal;
          $$.updateAndRedraw({ withLegend: true, withTransition: false, withTransitionForTransform: false });
      };
  
      c3_chart_fn.destroy = function () {
          var $$ = this.internal;
  
          window.clearInterval($$.intervalForObserveInserted);
  
          if ($$.resizeTimeout !== undefined) {
              window.clearTimeout($$.resizeTimeout);
          }
  
          if (window.detachEvent) {
              window.detachEvent('onresize', $$.resizeIfElementDisplayed);
          } else if (window.removeEventListener) {
              window.removeEventListener('resize', $$.resizeIfElementDisplayed);
          } else {
              var wrapper = window.onresize;
              // check if no one else removed our wrapper and remove our resizeFunction from it
              if (wrapper && wrapper.add && wrapper.remove) {
                  wrapper.remove($$.resizeFunction);
              }
          }
  
          // remove the inner resize functions
          $$.resizeFunction.remove();
  
          $$.selectChart.classed('c3', false).html("");
  
          // MEMO: this is needed because the reference of some elements will not be released, then memory leak will happen.
          Object.keys($$).forEach(function (key) {
              $$[key] = null;
          });
  
          return null;
      };
  
      // TODO: fix
      c3_chart_fn.color = function (id) {
          var $$ = this.internal;
          return $$.color(id); // more patterns
      };
  
      c3_chart_fn.data = function (targetIds) {
          var targets = this.internal.data.targets;
          return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
              return [].concat(targetIds).indexOf(t.id) >= 0;
          });
      };
      c3_chart_fn.data.shown = function (targetIds) {
          return this.internal.filterTargetsToShow(this.data(targetIds));
      };
      c3_chart_fn.data.values = function (targetId) {
          var targets,
              values = null;
          if (targetId) {
              targets = this.data(targetId);
              values = targets[0] ? targets[0].values.map(function (d) {
                  return d.value;
              }) : null;
          }
          return values;
      };
      c3_chart_fn.data.names = function (names) {
          this.internal.clearLegendItemTextBoxCache();
          return this.internal.updateDataAttributes('names', names);
      };
      c3_chart_fn.data.colors = function (colors) {
          return this.internal.updateDataAttributes('colors', colors);
      };
      c3_chart_fn.data.axes = function (axes) {
          return this.internal.updateDataAttributes('axes', axes);
      };
  
      c3_chart_fn.flow = function (args) {
          var $$ = this.internal,
              targets,
              data,
              notfoundIds = [],
              orgDataCount = $$.getMaxDataCount(),
              dataCount,
              domain,
              baseTarget,
              baseValue,
              length = 0,
              tail = 0,
              diff,
              to;
  
          if (args.json) {
              data = $$.convertJsonToData(args.json, args.keys);
          } else if (args.rows) {
              data = $$.convertRowsToData(args.rows);
          } else if (args.columns) {
              data = $$.convertColumnsToData(args.columns);
          } else {
              return;
          }
          targets = $$.convertDataToTargets(data, true);
  
          // Update/Add data
          $$.data.targets.forEach(function (t) {
              var found = false,
                  i,
                  j;
              for (i = 0; i < targets.length; i++) {
                  if (t.id === targets[i].id) {
                      found = true;
  
                      if (t.values[t.values.length - 1]) {
                          tail = t.values[t.values.length - 1].index + 1;
                      }
                      length = targets[i].values.length;
  
                      for (j = 0; j < length; j++) {
                          targets[i].values[j].index = tail + j;
                          if (!$$.isTimeSeries()) {
                              targets[i].values[j].x = tail + j;
                          }
                      }
                      t.values = t.values.concat(targets[i].values);
  
                      targets.splice(i, 1);
                      break;
                  }
              }
              if (!found) {
                  notfoundIds.push(t.id);
              }
          });
  
          // Append null for not found targets
          $$.data.targets.forEach(function (t) {
              var i, j;
              for (i = 0; i < notfoundIds.length; i++) {
                  if (t.id === notfoundIds[i]) {
                      tail = t.values[t.values.length - 1].index + 1;
                      for (j = 0; j < length; j++) {
                          t.values.push({
                              id: t.id,
                              index: tail + j,
                              x: $$.isTimeSeries() ? $$.getOtherTargetX(tail + j) : tail + j,
                              value: null
                          });
                      }
                  }
              }
          });
  
          // Generate null values for new target
          if ($$.data.targets.length) {
              targets.forEach(function (t) {
                  var i,
                      missing = [];
                  for (i = $$.data.targets[0].values[0].index; i < tail; i++) {
                      missing.push({
                          id: t.id,
                          index: i,
                          x: $$.isTimeSeries() ? $$.getOtherTargetX(i) : i,
                          value: null
                      });
                  }
                  t.values.forEach(function (v) {
                      v.index += tail;
                      if (!$$.isTimeSeries()) {
                          v.x += tail;
                      }
                  });
                  t.values = missing.concat(t.values);
              });
          }
          $$.data.targets = $$.data.targets.concat(targets); // add remained
  
          // check data count because behavior needs to change when it's only one
          dataCount = $$.getMaxDataCount();
          baseTarget = $$.data.targets[0];
          baseValue = baseTarget.values[0];
  
          // Update length to flow if needed
          if (isDefined(args.to)) {
              length = 0;
              to = $$.isTimeSeries() ? $$.parseDate(args.to) : args.to;
              baseTarget.values.forEach(function (v) {
                  if (v.x < to) {
                      length++;
                  }
              });
          } else if (isDefined(args.length)) {
              length = args.length;
          }
  
          // If only one data, update the domain to flow from left edge of the chart
          if (!orgDataCount) {
              if ($$.isTimeSeries()) {
                  if (baseTarget.values.length > 1) {
                      diff = baseTarget.values[baseTarget.values.length - 1].x - baseValue.x;
                  } else {
                      diff = baseValue.x - $$.getXDomain($$.data.targets)[0];
                  }
              } else {
                  diff = 1;
              }
              domain = [baseValue.x - diff, baseValue.x];
              $$.updateXDomain(null, true, true, false, domain);
          } else if (orgDataCount === 1) {
              if ($$.isTimeSeries()) {
                  diff = (baseTarget.values[baseTarget.values.length - 1].x - baseValue.x) / 2;
                  domain = [new Date(+baseValue.x - diff), new Date(+baseValue.x + diff)];
                  $$.updateXDomain(null, true, true, false, domain);
              }
          }
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Redraw with new targets
          $$.redraw({
              flow: {
                  index: baseValue.index,
                  length: length,
                  duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
                  done: args.done,
                  orgDataCount: orgDataCount
              },
              withLegend: true,
              withTransition: orgDataCount > 1,
              withTrimXDomain: false,
              withUpdateXAxis: true
          });
      };
  
      c3_chart_internal_fn.generateFlow = function (args) {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3;
  
          return function () {
              var targets = args.targets,
                  flow = args.flow,
                  drawBar = args.drawBar,
                  drawLine = args.drawLine,
                  drawArea = args.drawArea,
                  cx = args.cx,
                  cy = args.cy,
                  xv = args.xv,
                  xForText = args.xForText,
                  yForText = args.yForText,
                  duration = args.duration;
  
              var translateX,
                  scaleX = 1,
                  transform,
                  flowIndex = flow.index,
                  flowLength = flow.length,
                  flowStart = $$.getValueOnIndex($$.data.targets[0].values, flowIndex),
                  flowEnd = $$.getValueOnIndex($$.data.targets[0].values, flowIndex + flowLength),
                  orgDomain = $$.x.domain(),
                  domain,
                  durationForFlow = flow.duration || duration,
                  done = flow.done || function () {},
                  wait = $$.generateWait();
  
              var xgrid = $$.xgrid || d3.selectAll([]),
                  xgridLines = $$.xgridLines || d3.selectAll([]),
                  mainRegion = $$.mainRegion || d3.selectAll([]),
                  mainText = $$.mainText || d3.selectAll([]),
                  mainBar = $$.mainBar || d3.selectAll([]),
                  mainLine = $$.mainLine || d3.selectAll([]),
                  mainArea = $$.mainArea || d3.selectAll([]),
                  mainCircle = $$.mainCircle || d3.selectAll([]);
  
              // set flag
              $$.flowing = true;
  
              // remove head data after rendered
              $$.data.targets.forEach(function (d) {
                  d.values.splice(0, flowLength);
              });
  
              // update x domain to generate axis elements for flow
              domain = $$.updateXDomain(targets, true, true);
              // update elements related to x scale
              if ($$.updateXGrid) {
                  $$.updateXGrid(true);
              }
  
              // generate transform to flow
              if (!flow.orgDataCount) {
                  // if empty
                  if ($$.data.targets[0].values.length !== 1) {
                      translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
                  } else {
                      if ($$.isTimeSeries()) {
                          flowStart = $$.getValueOnIndex($$.data.targets[0].values, 0);
                          flowEnd = $$.getValueOnIndex($$.data.targets[0].values, $$.data.targets[0].values.length - 1);
                          translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
                      } else {
                          translateX = diffDomain(domain) / 2;
                      }
                  }
              } else if (flow.orgDataCount === 1 || (flowStart && flowStart.x) === (flowEnd && flowEnd.x)) {
                  translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
              } else {
                  if ($$.isTimeSeries()) {
                      translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
                  } else {
                      translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
                  }
              }
              scaleX = diffDomain(orgDomain) / diffDomain(domain);
              transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';
  
              $$.hideXGridFocus();
  
              d3.transition().ease('linear').duration(durationForFlow).each(function () {
                  wait.add($$.axes.x.transition().call($$.xAxis));
                  wait.add(mainBar.transition().attr('transform', transform));
                  wait.add(mainLine.transition().attr('transform', transform));
                  wait.add(mainArea.transition().attr('transform', transform));
                  wait.add(mainCircle.transition().attr('transform', transform));
                  wait.add(mainText.transition().attr('transform', transform));
                  wait.add(mainRegion.filter($$.isRegionOnX).transition().attr('transform', transform));
                  wait.add(xgrid.transition().attr('transform', transform));
                  wait.add(xgridLines.transition().attr('transform', transform));
              }).call(wait, function () {
                  var i,
                      shapes = [],
                      texts = [],
                      eventRects = [];
  
                  // remove flowed elements
                  if (flowLength) {
                      for (i = 0; i < flowLength; i++) {
                          shapes.push('.' + CLASS.shape + '-' + (flowIndex + i));
                          texts.push('.' + CLASS.text + '-' + (flowIndex + i));
                          eventRects.push('.' + CLASS.eventRect + '-' + (flowIndex + i));
                      }
                      $$.svg.selectAll('.' + CLASS.shapes).selectAll(shapes).remove();
                      $$.svg.selectAll('.' + CLASS.texts).selectAll(texts).remove();
                      $$.svg.selectAll('.' + CLASS.eventRects).selectAll(eventRects).remove();
                      $$.svg.select('.' + CLASS.xgrid).remove();
                  }
  
                  // draw again for removing flowed elements and reverting attr
                  xgrid.attr('transform', null).attr($$.xgridAttr);
                  xgridLines.attr('transform', null);
                  xgridLines.select('line').attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv);
                  xgridLines.select('text').attr("x", config.axis_rotated ? $$.width : 0).attr("y", xv);
                  mainBar.attr('transform', null).attr("d", drawBar);
                  mainLine.attr('transform', null).attr("d", drawLine);
                  mainArea.attr('transform', null).attr("d", drawArea);
                  mainCircle.attr('transform', null).attr("cx", cx).attr("cy", cy);
                  mainText.attr('transform', null).attr('x', xForText).attr('y', yForText).style('fill-opacity', $$.opacityForText.bind($$));
                  mainRegion.attr('transform', null);
                  mainRegion.select('rect').filter($$.isRegionOnX).attr("x", $$.regionX.bind($$)).attr("width", $$.regionWidth.bind($$));
  
                  if (config.interaction_enabled) {
                      $$.redrawEventRect();
                  }
  
                  // callback for end of flow
                  done();
  
                  $$.flowing = false;
              });
          };
      };
  
      c3_chart_fn.focus = function (targetIds) {
          var $$ = this.internal,
              candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), this.revert();
          this.defocus();
          candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);
          if ($$.hasArcType()) {
              $$.expandArc(targetIds);
          }
          $$.toggleFocusLegend(targetIds, true);
  
          $$.focusedTargetIds = targetIds;
          $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
      };
  
      c3_chart_fn.defocus = function (targetIds) {
          var $$ = this.internal,
              candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);
          if ($$.hasArcType()) {
              $$.unexpandArc(targetIds);
          }
          $$.toggleFocusLegend(targetIds, false);
  
          $$.focusedTargetIds = $$.focusedTargetIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
          $$.defocusedTargetIds = targetIds;
      };
  
      c3_chart_fn.revert = function (targetIds) {
          var $$ = this.internal,
              candidates;
  
          targetIds = $$.mapToTargetIds(targetIds);
          candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets
  
          candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);
          if ($$.hasArcType()) {
              $$.unexpandArc(targetIds);
          }
          if ($$.config.legend_show) {
              $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
              $$.legend.selectAll($$.selectorLegends(targetIds)).filter(function () {
                  return $$.d3.select(this).classed(CLASS.legendItemFocused);
              }).classed(CLASS.legendItemFocused, false);
          }
  
          $$.focusedTargetIds = [];
          $$.defocusedTargetIds = [];
      };
  
      c3_chart_fn.xgrids = function (grids) {
          var $$ = this.internal,
              config = $$.config;
          if (!grids) {
              return config.grid_x_lines;
          }
          config.grid_x_lines = grids;
          $$.redrawWithoutRescale();
          return config.grid_x_lines;
      };
      c3_chart_fn.xgrids.add = function (grids) {
          var $$ = this.internal;
          return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
      };
      c3_chart_fn.xgrids.remove = function (params) {
          // TODO: multiple
          var $$ = this.internal;
          $$.removeGridLines(params, true);
      };
  
      c3_chart_fn.ygrids = function (grids) {
          var $$ = this.internal,
              config = $$.config;
          if (!grids) {
              return config.grid_y_lines;
          }
          config.grid_y_lines = grids;
          $$.redrawWithoutRescale();
          return config.grid_y_lines;
      };
      c3_chart_fn.ygrids.add = function (grids) {
          var $$ = this.internal;
          return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
      };
      c3_chart_fn.ygrids.remove = function (params) {
          // TODO: multiple
          var $$ = this.internal;
          $$.removeGridLines(params, false);
      };
  
      c3_chart_fn.groups = function (groups) {
          var $$ = this.internal,
              config = $$.config;
          if (isUndefined(groups)) {
              return config.data_groups;
          }
          config.data_groups = groups;
          $$.redraw();
          return config.data_groups;
      };
  
      c3_chart_fn.legend = function () {};
      c3_chart_fn.legend.show = function (targetIds) {
          var $$ = this.internal;
          $$.showLegend($$.mapToTargetIds(targetIds));
          $$.updateAndRedraw({ withLegend: true });
      };
      c3_chart_fn.legend.hide = function (targetIds) {
          var $$ = this.internal;
          $$.hideLegend($$.mapToTargetIds(targetIds));
          $$.updateAndRedraw({ withLegend: true });
      };
  
      c3_chart_fn.load = function (args) {
          var $$ = this.internal,
              config = $$.config;
          // update xs if specified
          if (args.xs) {
              $$.addXs(args.xs);
          }
          // update names if exists
          if ('names' in args) {
              c3_chart_fn.data.names.bind(this)(args.names);
          }
          // update classes if exists
          if ('classes' in args) {
              Object.keys(args.classes).forEach(function (id) {
                  config.data_classes[id] = args.classes[id];
              });
          }
          // update categories if exists
          if ('categories' in args && $$.isCategorized()) {
              config.axis_x_categories = args.categories;
          }
          // update axes if exists
          if ('axes' in args) {
              Object.keys(args.axes).forEach(function (id) {
                  config.data_axes[id] = args.axes[id];
              });
          }
          // update colors if exists
          if ('colors' in args) {
              Object.keys(args.colors).forEach(function (id) {
                  config.data_colors[id] = args.colors[id];
              });
          }
          // use cache if exists
          if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
              $$.load($$.getCaches(args.cacheIds), args.done);
              return;
          }
          // unload if needed
          if ('unload' in args) {
              // TODO: do not unload if target will load (included in url/rows/columns)
              $$.unload($$.mapToTargetIds(typeof args.unload === 'boolean' && args.unload ? null : args.unload), function () {
                  $$.loadFromArgs(args);
              });
          } else {
              $$.loadFromArgs(args);
          }
      };
  
      c3_chart_fn.unload = function (args) {
          var $$ = this.internal;
          args = args || {};
          if (args instanceof Array) {
              args = { ids: args };
          } else if (typeof args === 'string') {
              args = { ids: [args] };
          }
          $$.unload($$.mapToTargetIds(args.ids), function () {
              $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
              if (args.done) {
                  args.done();
              }
          });
      };
  
      c3_chart_fn.regions = function (regions) {
          var $$ = this.internal,
              config = $$.config;
          if (!regions) {
              return config.regions;
          }
          config.regions = regions;
          $$.redrawWithoutRescale();
          return config.regions;
      };
      c3_chart_fn.regions.add = function (regions) {
          var $$ = this.internal,
              config = $$.config;
          if (!regions) {
              return config.regions;
          }
          config.regions = config.regions.concat(regions);
          $$.redrawWithoutRescale();
          return config.regions;
      };
      c3_chart_fn.regions.remove = function (options) {
          var $$ = this.internal,
              config = $$.config,
              duration,
              classes,
              regions;
  
          options = options || {};
          duration = $$.getOption(options, "duration", config.transition_duration);
          classes = $$.getOption(options, "classes", [CLASS.region]);
  
          regions = $$.main.select('.' + CLASS.regions).selectAll(classes.map(function (c) {
              return '.' + c;
          }));
          (duration ? regions.transition().duration(duration) : regions).style('opacity', 0).remove();
  
          config.regions = config.regions.filter(function (region) {
              var found = false;
              if (!region['class']) {
                  return true;
              }
              region['class'].split(' ').forEach(function (c) {
                  if (classes.indexOf(c) >= 0) {
                      found = true;
                  }
              });
              return !found;
          });
  
          return config.regions;
      };
  
      c3_chart_fn.selected = function (targetId) {
          var $$ = this.internal,
              d3 = $$.d3;
          return d3.merge($$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(targetId)).selectAll('.' + CLASS.shape).filter(function () {
              return d3.select(this).classed(CLASS.SELECTED);
          }).map(function (d) {
              return d.map(function (d) {
                  var data = d.__data__;return data.data ? data.data : data;
              });
          }));
      };
      c3_chart_fn.select = function (ids, indices, resetOther) {
          var $$ = this.internal,
              d3 = $$.d3,
              config = $$.config;
          if (!config.data_selection_enabled) {
              return;
          }
          $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
              var shape = d3.select(this),
                  id = d.data ? d.data.id : d.id,
                  toggle = $$.getToggle(this, d).bind($$),
                  isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                  isTargetIndex = !indices || indices.indexOf(i) >= 0,
                  isSelected = shape.classed(CLASS.SELECTED);
              // line/area selection not supported yet
              if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                  return;
              }
              if (isTargetId && isTargetIndex) {
                  if (config.data_selection_isselectable(d) && !isSelected) {
                      toggle(true, shape.classed(CLASS.SELECTED, true), d, i);
                  }
              } else if (isDefined(resetOther) && resetOther) {
                  if (isSelected) {
                      toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                  }
              }
          });
      };
      c3_chart_fn.unselect = function (ids, indices) {
          var $$ = this.internal,
              d3 = $$.d3,
              config = $$.config;
          if (!config.data_selection_enabled) {
              return;
          }
          $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
              var shape = d3.select(this),
                  id = d.data ? d.data.id : d.id,
                  toggle = $$.getToggle(this, d).bind($$),
                  isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
                  isTargetIndex = !indices || indices.indexOf(i) >= 0,
                  isSelected = shape.classed(CLASS.SELECTED);
              // line/area selection not supported yet
              if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
                  return;
              }
              if (isTargetId && isTargetIndex) {
                  if (config.data_selection_isselectable(d)) {
                      if (isSelected) {
                          toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                      }
                  }
              }
          });
      };
  
      c3_chart_fn.show = function (targetIds, options) {
          var $$ = this.internal,
              targets;
  
          targetIds = $$.mapToTargetIds(targetIds);
          options = options || {};
  
          $$.removeHiddenTargetIds(targetIds);
          targets = $$.svg.selectAll($$.selectorTargets(targetIds));
  
          targets.transition().style('opacity', 1, 'important').call($$.endall, function () {
              targets.style('opacity', null).style('opacity', 1);
          });
  
          if (options.withLegend) {
              $$.showLegend(targetIds);
          }
  
          $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
      };
  
      c3_chart_fn.hide = function (targetIds, options) {
          var $$ = this.internal,
              targets;
  
          targetIds = $$.mapToTargetIds(targetIds);
          options = options || {};
  
          $$.addHiddenTargetIds(targetIds);
          targets = $$.svg.selectAll($$.selectorTargets(targetIds));
  
          targets.transition().style('opacity', 0, 'important').call($$.endall, function () {
              targets.style('opacity', null).style('opacity', 0);
          });
  
          if (options.withLegend) {
              $$.hideLegend(targetIds);
          }
  
          $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
      };
  
      c3_chart_fn.toggle = function (targetIds, options) {
          var that = this,
              $$ = this.internal;
          $$.mapToTargetIds(targetIds).forEach(function (targetId) {
              $$.isTargetToShow(targetId) ? that.hide(targetId, options) : that.show(targetId, options);
          });
      };
  
      c3_chart_fn.tooltip = function () {};
      c3_chart_fn.tooltip.show = function (args) {
          var $$ = this.internal,
              index,
              mouse;
  
          // determine mouse position on the chart
          if (args.mouse) {
              mouse = args.mouse;
          }
  
          // determine focus data
          if (args.data) {
              if ($$.isMultipleX()) {
                  // if multiple xs, target point will be determined by mouse
                  mouse = [$$.x(args.data.x), $$.getYScale(args.data.id)(args.data.value)];
                  index = null;
              } else {
                  // TODO: when tooltip_grouped = false
                  index = isValue(args.data.index) ? args.data.index : $$.getIndexByX(args.data.x);
              }
          } else if (typeof args.x !== 'undefined') {
              index = $$.getIndexByX(args.x);
          } else if (typeof args.index !== 'undefined') {
              index = args.index;
          }
  
          // emulate mouse events to show
          $$.dispatchEvent('mouseover', index, mouse);
          $$.dispatchEvent('mousemove', index, mouse);
  
          $$.config.tooltip_onshow.call($$, args.data);
      };
      c3_chart_fn.tooltip.hide = function () {
          // TODO: get target data by checking the state of focus
          this.internal.dispatchEvent('mouseout', 0);
  
          this.internal.config.tooltip_onhide.call(this);
      };
  
      c3_chart_fn.transform = function (type, targetIds) {
          var $$ = this.internal,
              options = ['pie', 'donut'].indexOf(type) >= 0 ? { withTransform: true } : null;
          $$.transformTo(targetIds, type, options);
      };
  
      c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
          var $$ = this,
              withTransitionForAxis = !$$.hasArcType(),
              options = optionsForRedraw || { withTransitionForAxis: withTransitionForAxis };
          options.withTransitionForTransform = false;
          $$.transiting = false;
          $$.setTargetType(targetIds, type);
          $$.updateTargets($$.data.targets); // this is needed when transforming to arc
          $$.updateAndRedraw(options);
      };
  
      c3_chart_fn.x = function (x) {
          var $$ = this.internal;
          if (arguments.length) {
              $$.updateTargetX($$.data.targets, x);
              $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
          }
          return $$.data.xs;
      };
      c3_chart_fn.xs = function (xs) {
          var $$ = this.internal;
          if (arguments.length) {
              $$.updateTargetXs($$.data.targets, xs);
              $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true });
          }
          return $$.data.xs;
      };
  
      c3_chart_fn.zoom = function (domain) {
          var $$ = this.internal;
          if (domain) {
              if ($$.isTimeSeries()) {
                  domain = domain.map(function (x) {
                      return $$.parseDate(x);
                  });
              }
              $$.brush.extent(domain);
              $$.redraw({ withUpdateXDomain: true, withY: $$.config.zoom_rescale });
              $$.config.zoom_onzoom.call(this, $$.x.orgDomain());
          }
          return $$.brush.extent();
      };
      c3_chart_fn.zoom.enable = function (enabled) {
          var $$ = this.internal;
          $$.config.zoom_enabled = enabled;
          $$.updateAndRedraw();
      };
      c3_chart_fn.unzoom = function () {
          var $$ = this.internal;
          $$.brush.clear().update();
          $$.redraw({ withUpdateXDomain: true });
      };
  
      c3_chart_fn.zoom.max = function (max) {
          var $$ = this.internal,
              config = $$.config,
              d3 = $$.d3;
          if (max === 0 || max) {
              config.zoom_x_max = d3.max([$$.orgXDomain[1], max]);
          } else {
              return config.zoom_x_max;
          }
      };
  
      c3_chart_fn.zoom.min = function (min) {
          var $$ = this.internal,
              config = $$.config,
              d3 = $$.d3;
          if (min === 0 || min) {
              config.zoom_x_min = d3.min([$$.orgXDomain[0], min]);
          } else {
              return config.zoom_x_min;
          }
      };
  
      c3_chart_fn.zoom.range = function (range) {
          if (arguments.length) {
              if (isDefined(range.max)) {
                  this.domain.max(range.max);
              }
              if (isDefined(range.min)) {
                  this.domain.min(range.min);
              }
          } else {
              return {
                  max: this.domain.max(),
                  min: this.domain.min()
              };
          }
      };
  
      c3_chart_internal_fn.initPie = function () {
          var $$ = this,
              d3 = $$.d3;
          $$.pie = d3.layout.pie().value(function (d) {
              return d.values.reduce(function (a, b) {
                  return a + b.value;
              }, 0);
          });
          $$.pie.sort($$.getOrderFunction() || null);
      };
  
      c3_chart_internal_fn.updateRadius = function () {
          var $$ = this,
              config = $$.config,
              w = config.gauge_width || config.donut_width,
              gaugeArcWidth = $$.filterTargetsToShow($$.data.targets).length * $$.config.gauge_arcs_minWidth;
          $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2 * ($$.hasType('gauge') ? 0.85 : 1);
          $$.radius = $$.radiusExpanded * 0.95;
          $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
          $$.innerRadius = $$.hasType('donut') || $$.hasType('gauge') ? $$.radius * $$.innerRadiusRatio : 0;
          $$.gaugeArcWidth = w ? w : gaugeArcWidth <= $$.radius - $$.innerRadius ? $$.radius - $$.innerRadius : gaugeArcWidth <= $$.radius ? gaugeArcWidth : $$.radius;
      };
  
      c3_chart_internal_fn.updateArc = function () {
          var $$ = this;
          $$.svgArc = $$.getSvgArc();
          $$.svgArcExpanded = $$.getSvgArcExpanded();
          $$.svgArcExpandedSub = $$.getSvgArcExpanded(0.98);
      };
  
      c3_chart_internal_fn.updateAngle = function (d) {
          var $$ = this,
              config = $$.config,
              found = false,
              index = 0,
              gMin,
              gMax,
              gTic,
              gValue;
  
          if (!config) {
              return null;
          }
  
          $$.pie($$.filterTargetsToShow($$.data.targets)).forEach(function (t) {
              if (!found && t.data.id === d.data.id) {
                  found = true;
                  d = t;
                  d.index = index;
              }
              index++;
          });
          if (isNaN(d.startAngle)) {
              d.startAngle = 0;
          }
          if (isNaN(d.endAngle)) {
              d.endAngle = d.startAngle;
          }
          if ($$.isGaugeType(d.data)) {
              gMin = config.gauge_min;
              gMax = config.gauge_max;
              gTic = Math.PI * (config.gauge_fullCircle ? 2 : 1) / (gMax - gMin);
              gValue = d.value < gMin ? 0 : d.value < gMax ? d.value - gMin : gMax - gMin;
              d.startAngle = config.gauge_startingAngle;
              d.endAngle = d.startAngle + gTic * gValue;
          }
          return found ? d : null;
      };
  
      c3_chart_internal_fn.getSvgArc = function () {
          var $$ = this,
              hasGaugeType = $$.hasType('gauge'),
              singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
              arc = $$.d3.svg.arc().outerRadius(function (d) {
              return hasGaugeType ? $$.radius - singleArcWidth * d.index : $$.radius;
          }).innerRadius(function (d) {
              return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
          }),
              newArc = function newArc(d, withoutUpdate) {
              var updated;
              if (withoutUpdate) {
                  return arc(d);
              } // for interpolate
              updated = $$.updateAngle(d);
              return updated ? arc(updated) : "M 0 0";
          };
          // TODO: extends all function
          newArc.centroid = arc.centroid;
          return newArc;
      };
  
      c3_chart_internal_fn.getSvgArcExpanded = function (rate) {
          rate = rate || 1;
          var $$ = this,
              hasGaugeType = $$.hasType('gauge'),
              singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
              expandWidth = Math.min($$.radiusExpanded * rate - $$.radius, singleArcWidth * 0.8 - (1 - rate) * 100),
              arc = $$.d3.svg.arc().outerRadius(function (d) {
              return hasGaugeType ? $$.radius - singleArcWidth * d.index + expandWidth : $$.radiusExpanded * rate;
          }).innerRadius(function (d) {
              return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
          });
          return function (d) {
              var updated = $$.updateAngle(d);
              return updated ? arc(updated) : "M 0 0";
          };
      };
  
      c3_chart_internal_fn.getArc = function (d, withoutUpdate, force) {
          return force || this.isArcType(d.data) ? this.svgArc(d, withoutUpdate) : "M 0 0";
      };
  
      c3_chart_internal_fn.transformForArcLabel = function (d) {
          var $$ = this,
              config = $$.config,
              updated = $$.updateAngle(d),
              c,
              x,
              y,
              h,
              ratio,
              translate = "",
              hasGauge = $$.hasType('gauge');
          if (updated && !hasGauge) {
              c = this.svgArc.centroid(updated);
              x = isNaN(c[0]) ? 0 : c[0];
              y = isNaN(c[1]) ? 0 : c[1];
              h = Math.sqrt(x * x + y * y);
              if ($$.hasType('donut') && config.donut_label_ratio) {
                  ratio = isFunction(config.donut_label_ratio) ? config.donut_label_ratio(d, $$.radius, h) : config.donut_label_ratio;
              } else if ($$.hasType('pie') && config.pie_label_ratio) {
                  ratio = isFunction(config.pie_label_ratio) ? config.pie_label_ratio(d, $$.radius, h) : config.pie_label_ratio;
              } else {
                  ratio = $$.radius && h ? (36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) * $$.radius / h : 0;
              }
              translate = "translate(" + x * ratio + ',' + y * ratio + ")";
          } else if (updated && hasGauge && $$.filterTargetsToShow($$.data.targets).length > 1) {
              var y1 = Math.sin(updated.endAngle - Math.PI / 2);
              x = Math.cos(updated.endAngle - Math.PI / 2) * ($$.radiusExpanded + 25);
              y = y1 * ($$.radiusExpanded + 15 - Math.abs(y1 * 10)) + 3;
              translate = "translate(" + x + ',' + y + ")";
          }
          return translate;
      };
  
      c3_chart_internal_fn.getArcRatio = function (d) {
          var $$ = this,
              config = $$.config,
              whole = Math.PI * ($$.hasType('gauge') && !config.gauge_fullCircle ? 1 : 2);
          return d ? (d.endAngle - d.startAngle) / whole : null;
      };
  
      c3_chart_internal_fn.convertToArcData = function (d) {
          return this.addName({
              id: d.data.id,
              value: d.value,
              ratio: this.getArcRatio(d),
              index: d.index
          });
      };
  
      c3_chart_internal_fn.textForArcLabel = function (d) {
          var $$ = this,
              updated,
              value,
              ratio,
              id,
              format;
          if (!$$.shouldShowArcLabel()) {
              return "";
          }
          updated = $$.updateAngle(d);
          value = updated ? updated.value : null;
          ratio = $$.getArcRatio(updated);
          id = d.data.id;
          if (!$$.hasType('gauge') && !$$.meetsArcLabelThreshold(ratio)) {
              return "";
          }
          format = $$.getArcLabelFormat();
          return format ? format(value, ratio, id) : $$.defaultArcValueFormat(value, ratio);
      };
  
      c3_chart_internal_fn.textForGaugeMinMax = function (value, isMax) {
          var $$ = this,
              format = $$.getGaugeLabelExtents();
  
          return format ? format(value, isMax) : value;
      };
  
      c3_chart_internal_fn.expandArc = function (targetIds) {
          var $$ = this,
              interval;
  
          // MEMO: avoid to cancel transition
          if ($$.transiting) {
              interval = window.setInterval(function () {
                  if (!$$.transiting) {
                      window.clearInterval(interval);
                      if ($$.legend.selectAll('.c3-legend-item-focused').size() > 0) {
                          $$.expandArc(targetIds);
                      }
                  }
              }, 10);
              return;
          }
  
          targetIds = $$.mapToTargetIds(targetIds);
  
          $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).each(function (d) {
              if (!$$.shouldExpand(d.data.id)) {
                  return;
              }
              $$.d3.select(this).selectAll('path').transition().duration($$.expandDuration(d.data.id)).attr("d", $$.svgArcExpanded).transition().duration($$.expandDuration(d.data.id) * 2).attr("d", $$.svgArcExpandedSub).each(function (d) {
                  if ($$.isDonutType(d.data)) {
                      // callback here
                  }
              });
          });
      };
  
      c3_chart_internal_fn.unexpandArc = function (targetIds) {
          var $$ = this;
  
          if ($$.transiting) {
              return;
          }
  
          targetIds = $$.mapToTargetIds(targetIds);
  
          $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).selectAll('path').transition().duration(function (d) {
              return $$.expandDuration(d.data.id);
          }).attr("d", $$.svgArc);
          $$.svg.selectAll('.' + CLASS.arc);
      };
  
      c3_chart_internal_fn.expandDuration = function (id) {
          var $$ = this,
              config = $$.config;
  
          if ($$.isDonutType(id)) {
              return config.donut_expand_duration;
          } else if ($$.isGaugeType(id)) {
              return config.gauge_expand_duration;
          } else if ($$.isPieType(id)) {
              return config.pie_expand_duration;
          } else {
              return 50;
          }
      };
  
      c3_chart_internal_fn.shouldExpand = function (id) {
          var $$ = this,
              config = $$.config;
          return $$.isDonutType(id) && config.donut_expand || $$.isGaugeType(id) && config.gauge_expand || $$.isPieType(id) && config.pie_expand;
      };
  
      c3_chart_internal_fn.shouldShowArcLabel = function () {
          var $$ = this,
              config = $$.config,
              shouldShow = true;
          if ($$.hasType('donut')) {
              shouldShow = config.donut_label_show;
          } else if ($$.hasType('pie')) {
              shouldShow = config.pie_label_show;
          }
          // when gauge, always true
          return shouldShow;
      };
  
      c3_chart_internal_fn.meetsArcLabelThreshold = function (ratio) {
          var $$ = this,
              config = $$.config,
              threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
          return ratio >= threshold;
      };
  
      c3_chart_internal_fn.getArcLabelFormat = function () {
          var $$ = this,
              config = $$.config,
              format = config.pie_label_format;
          if ($$.hasType('gauge')) {
              format = config.gauge_label_format;
          } else if ($$.hasType('donut')) {
              format = config.donut_label_format;
          }
          return format;
      };
  
      c3_chart_internal_fn.getGaugeLabelExtents = function () {
          var $$ = this,
              config = $$.config;
          return config.gauge_label_extents;
      };
  
      c3_chart_internal_fn.getArcTitle = function () {
          var $$ = this;
          return $$.hasType('donut') ? $$.config.donut_title : "";
      };
  
      c3_chart_internal_fn.updateTargetsForArc = function (targets) {
          var $$ = this,
              main = $$.main,
              mainPieUpdate,
              mainPieEnter,
              classChartArc = $$.classChartArc.bind($$),
              classArcs = $$.classArcs.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainPieUpdate = main.select('.' + CLASS.chartArcs).selectAll('.' + CLASS.chartArc).data($$.pie(targets)).attr("class", function (d) {
              return classChartArc(d) + classFocus(d.data);
          });
          mainPieEnter = mainPieUpdate.enter().append("g").attr("class", classChartArc);
          mainPieEnter.append('g').attr('class', classArcs);
          mainPieEnter.append("text").attr("dy", $$.hasType('gauge') ? "-.1em" : ".35em").style("opacity", 0).style("text-anchor", "middle").style("pointer-events", "none");
          // MEMO: can not keep same color..., but not bad to update color in redraw
          //mainPieUpdate.exit().remove();
      };
  
      c3_chart_internal_fn.initArc = function () {
          var $$ = this;
          $$.arcs = $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
          $$.arcs.append('text').attr('class', CLASS.chartArcsTitle).style("text-anchor", "middle").text($$.getArcTitle());
      };
  
      c3_chart_internal_fn.redrawArc = function (duration, durationForExit, withTransform) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config,
              main = $$.main,
              mainArc,
              backgroundArc,
              mainArcLabelLine,
              hasGaugeType = $$.hasType('gauge');
          mainArc = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arc).data($$.arcData.bind($$));
          mainArc.enter().append('path').attr("class", $$.classArc.bind($$)).style("fill", function (d) {
              return $$.color(d.data);
          }).style("cursor", function (d) {
              return config.interaction_enabled && config.data_selection_isselectable(d) ? "pointer" : null;
          }).each(function (d) {
              if ($$.isGaugeType(d.data)) {
                  d.startAngle = d.endAngle = config.gauge_startingAngle;
              }
              this._current = d;
          });
          if (hasGaugeType) {
              mainArcLabelLine = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arcLabelLine).data($$.arcData.bind($$));
              mainArcLabelLine.enter().append('rect').attr("class", function (d) {
                  return CLASS.arcLabelLine + ' ' + CLASS.target + ' ' + CLASS.target + '-' + d.data.id;
              });
              if ($$.filterTargetsToShow($$.data.targets).length === 1) {
                  mainArcLabelLine.style("display", "none");
              } else {
                  mainArcLabelLine.style("fill", function (d) {
                      return config.color_pattern.length > 0 ? $$.levelColor(d.data.values[0].value) : $$.color(d.data);
                  }).style("display", config.gauge_labelLine_show ? "" : "none").each(function (d) {
                      var lineLength = 0,
                          lineThickness = 2,
                          x = 0,
                          y = 0,
                          transform = "";
                      if ($$.hiddenTargetIds.indexOf(d.data.id) < 0) {
                          var updated = $$.updateAngle(d),
                              innerLineLength = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length * (updated.index + 1),
                              lineAngle = updated.endAngle - Math.PI / 2,
                              arcInnerRadius = $$.radius - innerLineLength,
                              linePositioningAngle = lineAngle - (arcInnerRadius === 0 ? 0 : 1 / arcInnerRadius);
                          lineLength = $$.radiusExpanded - $$.radius + innerLineLength;
                          x = Math.cos(linePositioningAngle) * arcInnerRadius;
                          y = Math.sin(linePositioningAngle) * arcInnerRadius;
                          transform = "rotate(" + lineAngle * 180 / Math.PI + ", " + x + ", " + y + ")";
                      }
                      d3.select(this).attr({ x: x, y: y, width: lineLength, height: lineThickness, transform: transform }).style("stroke-dasharray", "0, " + (lineLength + lineThickness) + ", 0");
                  });
              }
          }
          mainArc.attr("transform", function (d) {
              return !$$.isGaugeType(d.data) && withTransform ? "scale(0)" : "";
          }).on('mouseover', config.interaction_enabled ? function (d) {
              var updated, arcData;
              if ($$.transiting) {
                  // skip while transiting
                  return;
              }
              updated = $$.updateAngle(d);
              if (updated) {
                  arcData = $$.convertToArcData(updated);
                  // transitions
                  $$.expandArc(updated.data.id);
                  $$.api.focus(updated.data.id);
                  $$.toggleFocusLegend(updated.data.id, true);
                  $$.config.data_onmouseover(arcData, this);
              }
          } : null).on('mousemove', config.interaction_enabled ? function (d) {
              var updated = $$.updateAngle(d),
                  arcData,
                  selectedData;
              if (updated) {
                  arcData = $$.convertToArcData(updated), selectedData = [arcData];
                  $$.showTooltip(selectedData, this);
              }
          } : null).on('mouseout', config.interaction_enabled ? function (d) {
              var updated, arcData;
              if ($$.transiting) {
                  // skip while transiting
                  return;
              }
              updated = $$.updateAngle(d);
              if (updated) {
                  arcData = $$.convertToArcData(updated);
                  // transitions
                  $$.unexpandArc(updated.data.id);
                  $$.api.revert();
                  $$.revertLegend();
                  $$.hideTooltip();
                  $$.config.data_onmouseout(arcData, this);
              }
          } : null).on('click', config.interaction_enabled ? function (d, i) {
              var updated = $$.updateAngle(d),
                  arcData;
              if (updated) {
                  arcData = $$.convertToArcData(updated);
                  if ($$.toggleShape) {
                      $$.toggleShape(this, arcData, i);
                  }
                  $$.config.data_onclick.call($$.api, arcData, this);
              }
          } : null).each(function () {
              $$.transiting = true;
          }).transition().duration(duration).attrTween("d", function (d) {
              var updated = $$.updateAngle(d),
                  interpolate;
              if (!updated) {
                  return function () {
                      return "M 0 0";
                  };
              }
              //                if (this._current === d) {
              //                    this._current = {
              //                        startAngle: Math.PI*2,
              //                        endAngle: Math.PI*2,
              //                    };
              //                }
              if (isNaN(this._current.startAngle)) {
                  this._current.startAngle = 0;
              }
              if (isNaN(this._current.endAngle)) {
                  this._current.endAngle = this._current.startAngle;
              }
              interpolate = d3.interpolate(this._current, updated);
              this._current = interpolate(0);
              return function (t) {
                  var interpolated = interpolate(t);
                  interpolated.data = d.data; // data.id will be updated by interporator
                  return $$.getArc(interpolated, true);
              };
          }).attr("transform", withTransform ? "scale(1)" : "").style("fill", function (d) {
              return $$.levelColor ? $$.levelColor(d.data.values[0].value) : $$.color(d.data.id);
          }) // Where gauge reading color would receive customization.
          .call($$.endall, function () {
              $$.transiting = false;
          });
          mainArc.exit().transition().duration(durationForExit).style('opacity', 0).remove();
          main.selectAll('.' + CLASS.chartArc).select('text').style("opacity", 0).attr('class', function (d) {
              return $$.isGaugeType(d.data) ? CLASS.gaugeValue : '';
          }).text($$.textForArcLabel.bind($$)).attr("transform", $$.transformForArcLabel.bind($$)).style('font-size', function (d) {
              return $$.isGaugeType(d.data) && $$.filterTargetsToShow($$.data.targets).length === 1 ? Math.round($$.radius / 5) + 'px' : '';
          }).transition().duration(duration).style("opacity", function (d) {
              return $$.isTargetToShow(d.data.id) && $$.isArcType(d.data) ? 1 : 0;
          });
          main.select('.' + CLASS.chartArcsTitle).style("opacity", $$.hasType('donut') || hasGaugeType ? 1 : 0);
  
          if (hasGaugeType) {
              var index = 0;
              backgroundArc = $$.arcs.select('g.' + CLASS.chartArcsBackground).selectAll('path.' + CLASS.chartArcsBackground).data($$.data.targets);
              backgroundArc.enter().append("path");
              backgroundArc.attr("class", function (d, i) {
                  return CLASS.chartArcsBackground + ' ' + CLASS.chartArcsBackground + '-' + i;
              }).attr("d", function (d1) {
                  if ($$.hiddenTargetIds.indexOf(d1.id) >= 0) {
                      return "M 0 0";
                  }
  
                  var d = {
                      data: [{ value: config.gauge_max }],
                      startAngle: config.gauge_startingAngle,
                      endAngle: -1 * config.gauge_startingAngle * (config.gauge_fullCircle ? Math.PI : 1),
                      index: index++
                  };
                  return $$.getArc(d, true, true);
              });
              backgroundArc.exit().remove();
  
              $$.arcs.select('.' + CLASS.chartArcsGaugeUnit).attr("dy", ".75em").text(config.gauge_label_show ? config.gauge_units : '');
              $$.arcs.select('.' + CLASS.chartArcsGaugeMin).attr("dx", -1 * ($$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2)) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_min, false) : '');
              $$.arcs.select('.' + CLASS.chartArcsGaugeMax).attr("dx", $$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_max, true) : '');
          }
      };
      c3_chart_internal_fn.initGauge = function () {
          var arcs = this.arcs;
          if (this.hasType('gauge')) {
              arcs.append('g').attr("class", CLASS.chartArcsBackground);
              arcs.append("text").attr("class", CLASS.chartArcsGaugeUnit).style("text-anchor", "middle").style("pointer-events", "none");
              arcs.append("text").attr("class", CLASS.chartArcsGaugeMin).style("text-anchor", "middle").style("pointer-events", "none");
              arcs.append("text").attr("class", CLASS.chartArcsGaugeMax).style("text-anchor", "middle").style("pointer-events", "none");
          }
      };
      c3_chart_internal_fn.getGaugeLabelHeight = function () {
          return this.config.gauge_label_show ? 20 : 0;
      };
  
      c3_chart_internal_fn.hasCaches = function (ids) {
          for (var i = 0; i < ids.length; i++) {
              if (!(ids[i] in this.cache)) {
                  return false;
              }
          }
          return true;
      };
      c3_chart_internal_fn.addCache = function (id, target) {
          this.cache[id] = this.cloneTarget(target);
      };
      c3_chart_internal_fn.getCaches = function (ids) {
          var targets = [],
              i;
          for (i = 0; i < ids.length; i++) {
              if (ids[i] in this.cache) {
                  targets.push(this.cloneTarget(this.cache[ids[i]]));
              }
          }
          return targets;
      };
  
      c3_chart_internal_fn.categoryName = function (i) {
          var config = this.config;
          return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
      };
  
      c3_chart_internal_fn.generateClass = function (prefix, targetId) {
          return " " + prefix + " " + prefix + this.getTargetSelectorSuffix(targetId);
      };
      c3_chart_internal_fn.classText = function (d) {
          return this.generateClass(CLASS.text, d.index);
      };
      c3_chart_internal_fn.classTexts = function (d) {
          return this.generateClass(CLASS.texts, d.id);
      };
      c3_chart_internal_fn.classShape = function (d) {
          return this.generateClass(CLASS.shape, d.index);
      };
      c3_chart_internal_fn.classShapes = function (d) {
          return this.generateClass(CLASS.shapes, d.id);
      };
      c3_chart_internal_fn.classLine = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.line, d.id);
      };
      c3_chart_internal_fn.classLines = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.lines, d.id);
      };
      c3_chart_internal_fn.classCircle = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.circle, d.index);
      };
      c3_chart_internal_fn.classCircles = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.circles, d.id);
      };
      c3_chart_internal_fn.classBar = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.bar, d.index);
      };
      c3_chart_internal_fn.classBars = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.bars, d.id);
      };
      c3_chart_internal_fn.classArc = function (d) {
          return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id);
      };
      c3_chart_internal_fn.classArcs = function (d) {
          return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id);
      };
      c3_chart_internal_fn.classArea = function (d) {
          return this.classShape(d) + this.generateClass(CLASS.area, d.id);
      };
      c3_chart_internal_fn.classAreas = function (d) {
          return this.classShapes(d) + this.generateClass(CLASS.areas, d.id);
      };
      c3_chart_internal_fn.classRegion = function (d, i) {
          return this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '');
      };
      c3_chart_internal_fn.classEvent = function (d) {
          return this.generateClass(CLASS.eventRect, d.index);
      };
      c3_chart_internal_fn.classTarget = function (id) {
          var $$ = this;
          var additionalClassSuffix = $$.config.data_classes[id],
              additionalClass = '';
          if (additionalClassSuffix) {
              additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
          }
          return $$.generateClass(CLASS.target, id) + additionalClass;
      };
      c3_chart_internal_fn.classFocus = function (d) {
          return this.classFocused(d) + this.classDefocused(d);
      };
      c3_chart_internal_fn.classFocused = function (d) {
          return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '');
      };
      c3_chart_internal_fn.classDefocused = function (d) {
          return ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '');
      };
      c3_chart_internal_fn.classChartText = function (d) {
          return CLASS.chartText + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartLine = function (d) {
          return CLASS.chartLine + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartBar = function (d) {
          return CLASS.chartBar + this.classTarget(d.id);
      };
      c3_chart_internal_fn.classChartArc = function (d) {
          return CLASS.chartArc + this.classTarget(d.data.id);
      };
      c3_chart_internal_fn.getTargetSelectorSuffix = function (targetId) {
          return targetId || targetId === 0 ? ('-' + targetId).replace(/[\s?!@#$%^&*()_=+,.<>'":;\[\]\/|~`{}\\]/g, '-') : '';
      };
      c3_chart_internal_fn.selectorTarget = function (id, prefix) {
          return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id);
      };
      c3_chart_internal_fn.selectorTargets = function (ids, prefix) {
          var $$ = this;
          ids = ids || [];
          return ids.length ? ids.map(function (id) {
              return $$.selectorTarget(id, prefix);
          }) : null;
      };
      c3_chart_internal_fn.selectorLegend = function (id) {
          return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id);
      };
      c3_chart_internal_fn.selectorLegends = function (ids) {
          var $$ = this;
          return ids && ids.length ? ids.map(function (id) {
              return $$.selectorLegend(id);
          }) : null;
      };
  
      c3_chart_internal_fn.getClipPath = function (id) {
          var isIE9 = window.navigator.appVersion.toLowerCase().indexOf("msie 9.") >= 0;
          return "url(" + (isIE9 ? "" : document.URL.split('#')[0]) + "#" + id + ")";
      };
      c3_chart_internal_fn.appendClip = function (parent, id) {
          return parent.append("clipPath").attr("id", id).append("rect");
      };
      c3_chart_internal_fn.getAxisClipX = function (forHorizontal) {
          // axis line width + padding for left
          var left = Math.max(30, this.margin.left);
          return forHorizontal ? -(1 + left) : -(left - 1);
      };
      c3_chart_internal_fn.getAxisClipY = function (forHorizontal) {
          return forHorizontal ? -20 : -this.margin.top;
      };
      c3_chart_internal_fn.getXAxisClipX = function () {
          var $$ = this;
          return $$.getAxisClipX(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getXAxisClipY = function () {
          var $$ = this;
          return $$.getAxisClipY(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipX = function () {
          var $$ = this;
          return $$.config.axis_y_inner ? -1 : $$.getAxisClipX($$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipY = function () {
          var $$ = this;
          return $$.getAxisClipY($$.config.axis_rotated);
      };
      c3_chart_internal_fn.getAxisClipWidth = function (forHorizontal) {
          var $$ = this,
              left = Math.max(30, $$.margin.left),
              right = Math.max(30, $$.margin.right);
          // width + axis line width + padding for left/right
          return forHorizontal ? $$.width + 2 + left + right : $$.margin.left + 20;
      };
      c3_chart_internal_fn.getAxisClipHeight = function (forHorizontal) {
          // less than 20 is not enough to show the axis label 'outer' without legend
          return (forHorizontal ? this.margin.bottom : this.margin.top + this.height) + 20;
      };
      c3_chart_internal_fn.getXAxisClipWidth = function () {
          var $$ = this;
          return $$.getAxisClipWidth(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getXAxisClipHeight = function () {
          var $$ = this;
          return $$.getAxisClipHeight(!$$.config.axis_rotated);
      };
      c3_chart_internal_fn.getYAxisClipWidth = function () {
          var $$ = this;
          return $$.getAxisClipWidth($$.config.axis_rotated) + ($$.config.axis_y_inner ? 20 : 0);
      };
      c3_chart_internal_fn.getYAxisClipHeight = function () {
          var $$ = this;
          return $$.getAxisClipHeight($$.config.axis_rotated);
      };
  
      c3_chart_internal_fn.generateColor = function () {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3,
              colors = config.data_colors,
              pattern = notEmpty(config.color_pattern) ? config.color_pattern : d3.scale.category10().range(),
              callback = config.data_color,
              ids = [];
  
          return function (d) {
              var id = d.id || d.data && d.data.id || d,
                  color;
  
              // if callback function is provided
              if (colors[id] instanceof Function) {
                  color = colors[id](d);
              }
              // if specified, choose that color
              else if (colors[id]) {
                      color = colors[id];
                  }
                  // if not specified, choose from pattern
                  else {
                          if (ids.indexOf(id) < 0) {
                              ids.push(id);
                          }
                          color = pattern[ids.indexOf(id) % pattern.length];
                          colors[id] = color;
                      }
              return callback instanceof Function ? callback(color, d) : color;
          };
      };
      c3_chart_internal_fn.generateLevelColor = function () {
          var $$ = this,
              config = $$.config,
              colors = config.color_pattern,
              threshold = config.color_threshold,
              asValue = threshold.unit === 'value',
              values = threshold.values && threshold.values.length ? threshold.values : [],
              max = threshold.max || 100;
          return notEmpty(config.color_threshold) ? function (value) {
              var i,
                  v,
                  color = colors[colors.length - 1];
              for (i = 0; i < values.length; i++) {
                  v = asValue ? value : value * 100 / max;
                  if (v < values[i]) {
                      color = colors[i];
                      break;
                  }
              }
              return color;
          } : null;
      };
  
      c3_chart_internal_fn.getDefaultConfig = function () {
          var config = {
              bindto: '#chart',
              svg_classname: undefined,
              size_width: undefined,
              size_height: undefined,
              padding_left: undefined,
              padding_right: undefined,
              padding_top: undefined,
              padding_bottom: undefined,
              resize_auto: true,
              zoom_enabled: false,
              zoom_extent: undefined,
              zoom_privileged: false,
              zoom_rescale: false,
              zoom_onzoom: function zoom_onzoom() {},
              zoom_onzoomstart: function zoom_onzoomstart() {},
              zoom_onzoomend: function zoom_onzoomend() {},
              zoom_x_min: undefined,
              zoom_x_max: undefined,
              interaction_brighten: true,
              interaction_enabled: true,
              onmouseover: function onmouseover() {},
              onmouseout: function onmouseout() {},
              onresize: function onresize() {},
              onresized: function onresized() {},
              oninit: function oninit() {},
              onrendered: function onrendered() {},
              transition_duration: 350,
              data_x: undefined,
              data_xs: {},
              data_xFormat: '%Y-%m-%d',
              data_xLocaltime: true,
              data_xSort: true,
              data_idConverter: function data_idConverter(id) {
                  return id;
              },
              data_names: {},
              data_classes: {},
              data_groups: [],
              data_axes: {},
              data_type: undefined,
              data_types: {},
              data_labels: {},
              data_order: 'desc',
              data_regions: {},
              data_color: undefined,
              data_colors: {},
              data_hide: false,
              data_filter: undefined,
              data_selection_enabled: false,
              data_selection_grouped: false,
              data_selection_isselectable: function data_selection_isselectable() {
                  return true;
              },
              data_selection_multiple: true,
              data_selection_draggable: false,
              data_onclick: function data_onclick() {},
              data_onmouseover: function data_onmouseover() {},
              data_onmouseout: function data_onmouseout() {},
              data_onselected: function data_onselected() {},
              data_onunselected: function data_onunselected() {},
              data_url: undefined,
              data_headers: undefined,
              data_json: undefined,
              data_rows: undefined,
              data_columns: undefined,
              data_mimeType: undefined,
              data_keys: undefined,
              // configuration for no plot-able data supplied.
              data_empty_label_text: "",
              // subchart
              subchart_show: false,
              subchart_size_height: 60,
              subchart_axis_x_show: true,
              subchart_onbrush: function subchart_onbrush() {},
              // color
              color_pattern: [],
              color_threshold: {},
              // legend
              legend_show: true,
              legend_hide: false,
              legend_position: 'bottom',
              legend_inset_anchor: 'top-left',
              legend_inset_x: 10,
              legend_inset_y: 0,
              legend_inset_step: undefined,
              legend_item_onclick: undefined,
              legend_item_onmouseover: undefined,
              legend_item_onmouseout: undefined,
              legend_equally: false,
              legend_padding: 0,
              legend_item_tile_width: 10,
              legend_item_tile_height: 10,
              // axis
              axis_rotated: false,
              axis_x_show: true,
              axis_x_type: 'indexed',
              axis_x_localtime: true,
              axis_x_categories: [],
              axis_x_tick_centered: false,
              axis_x_tick_format: undefined,
              axis_x_tick_culling: {},
              axis_x_tick_culling_max: 10,
              axis_x_tick_count: undefined,
              axis_x_tick_fit: true,
              axis_x_tick_values: null,
              axis_x_tick_rotate: 0,
              axis_x_tick_outer: true,
              axis_x_tick_multiline: true,
              axis_x_tick_multilineMax: 0,
              axis_x_tick_width: null,
              axis_x_max: undefined,
              axis_x_min: undefined,
              axis_x_padding: {},
              axis_x_height: undefined,
              axis_x_extent: undefined,
              axis_x_label: {},
              axis_x_inner: undefined,
              axis_y_show: true,
              axis_y_type: undefined,
              axis_y_max: undefined,
              axis_y_min: undefined,
              axis_y_inverted: false,
              axis_y_center: undefined,
              axis_y_inner: undefined,
              axis_y_label: {},
              axis_y_tick_format: undefined,
              axis_y_tick_outer: true,
              axis_y_tick_values: null,
              axis_y_tick_rotate: 0,
              axis_y_tick_count: undefined,
              axis_y_tick_time_value: undefined,
              axis_y_tick_time_interval: undefined,
              axis_y_padding: {},
              axis_y_default: undefined,
              axis_y2_show: false,
              axis_y2_max: undefined,
              axis_y2_min: undefined,
              axis_y2_inverted: false,
              axis_y2_center: undefined,
              axis_y2_inner: undefined,
              axis_y2_label: {},
              axis_y2_tick_format: undefined,
              axis_y2_tick_outer: true,
              axis_y2_tick_values: null,
              axis_y2_tick_count: undefined,
              axis_y2_padding: {},
              axis_y2_default: undefined,
              // grid
              grid_x_show: false,
              grid_x_type: 'tick',
              grid_x_lines: [],
              grid_y_show: false,
              // not used
              // grid_y_type: 'tick',
              grid_y_lines: [],
              grid_y_ticks: 10,
              grid_focus_show: true,
              grid_lines_front: true,
              // point - point of each data
              point_show: true,
              point_r: 2.5,
              point_sensitivity: 10,
              point_focus_expand_enabled: true,
              point_focus_expand_r: undefined,
              point_select_r: undefined,
              // line
              line_connectNull: false,
              line_step_type: 'step',
              // bar
              bar_width: undefined,
              bar_width_ratio: 0.6,
              bar_width_max: undefined,
              bar_zerobased: true,
              bar_space: 0,
              // area
              area_zerobased: true,
              area_above: false,
              // pie
              pie_label_show: true,
              pie_label_format: undefined,
              pie_label_threshold: 0.05,
              pie_label_ratio: undefined,
              pie_expand: {},
              pie_expand_duration: 50,
              // gauge
              gauge_fullCircle: false,
              gauge_label_show: true,
              gauge_labelLine_show: true,
              gauge_label_format: undefined,
              gauge_min: 0,
              gauge_max: 100,
              gauge_startingAngle: -1 * Math.PI / 2,
              gauge_label_extents: undefined,
              gauge_units: undefined,
              gauge_width: undefined,
              gauge_arcs_minWidth: 5,
              gauge_expand: {},
              gauge_expand_duration: 50,
              // donut
              donut_label_show: true,
              donut_label_format: undefined,
              donut_label_threshold: 0.05,
              donut_label_ratio: undefined,
              donut_width: undefined,
              donut_title: "",
              donut_expand: {},
              donut_expand_duration: 50,
              // spline
              spline_interpolation_type: 'cardinal',
              // region - region to change style
              regions: [],
              // tooltip - show when mouseover on each data
              tooltip_show: true,
              tooltip_grouped: true,
              tooltip_order: undefined,
              tooltip_format_title: undefined,
              tooltip_format_name: undefined,
              tooltip_format_value: undefined,
              tooltip_position: undefined,
              tooltip_contents: function tooltip_contents(d, defaultTitleFormat, defaultValueFormat, color) {
                  return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
              },
              tooltip_init_show: false,
              tooltip_init_x: 0,
              tooltip_init_position: { top: '0px', left: '50px' },
              tooltip_onshow: function tooltip_onshow() {},
              tooltip_onhide: function tooltip_onhide() {},
              // title
              title_text: undefined,
              title_padding: {
                  top: 0,
                  right: 0,
                  bottom: 0,
                  left: 0
              },
              title_position: 'top-center'
          };
  
          Object.keys(this.additionalConfig).forEach(function (key) {
              config[key] = this.additionalConfig[key];
          }, this);
  
          return config;
      };
      c3_chart_internal_fn.additionalConfig = {};
  
      c3_chart_internal_fn.loadConfig = function (config) {
          var this_config = this.config,
              target,
              keys,
              read;
          function find() {
              var key = keys.shift();
              //        console.log("key =>", key, ", target =>", target);
              if (key && target && (typeof target === 'undefined' ? 'undefined' : _typeof(target)) === 'object' && key in target) {
                  target = target[key];
                  return find();
              } else if (!key) {
                  return target;
              } else {
                  return undefined;
              }
          }
          Object.keys(this_config).forEach(function (key) {
              target = config;
              keys = key.split('_');
              read = find();
              //        console.log("CONFIG : ", key, read);
              if (isDefined(read)) {
                  this_config[key] = read;
              }
          });
      };
  
      c3_chart_internal_fn.convertUrlToData = function (url, mimeType, headers, keys, done) {
          var $$ = this,
              type = mimeType ? mimeType : 'csv';
          var req = $$.d3.xhr(url);
          if (headers) {
              Object.keys(headers).forEach(function (header) {
                  req.header(header, headers[header]);
              });
          }
          req.get(function (error, data) {
              var d;
              var dataResponse = data.response || data.responseText; // Fixes IE9 XHR issue; see #1345
              if (!data) {
                  throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
              }
              if (type === 'json') {
                  d = $$.convertJsonToData(JSON.parse(dataResponse), keys);
              } else if (type === 'tsv') {
                  d = $$.convertTsvToData(dataResponse);
              } else {
                  d = $$.convertCsvToData(dataResponse);
              }
              done.call($$, d);
          });
      };
      c3_chart_internal_fn.convertXsvToData = function (xsv, parser) {
          var rows = parser.parseRows(xsv),
              d;
          if (rows.length === 1) {
              d = [{}];
              rows[0].forEach(function (id) {
                  d[0][id] = null;
              });
          } else {
              d = parser.parse(xsv);
          }
          return d;
      };
      c3_chart_internal_fn.convertCsvToData = function (csv) {
          return this.convertXsvToData(csv, this.d3.csv);
      };
      c3_chart_internal_fn.convertTsvToData = function (tsv) {
          return this.convertXsvToData(tsv, this.d3.tsv);
      };
      c3_chart_internal_fn.convertJsonToData = function (json, keys) {
          var $$ = this,
              new_rows = [],
              targetKeys,
              data;
          if (keys) {
              // when keys specified, json would be an array that includes objects
              if (keys.x) {
                  targetKeys = keys.value.concat(keys.x);
                  $$.config.data_x = keys.x;
              } else {
                  targetKeys = keys.value;
              }
              new_rows.push(targetKeys);
              json.forEach(function (o) {
                  var new_row = [];
                  targetKeys.forEach(function (key) {
                      // convert undefined to null because undefined data will be removed in convertDataToTargets()
                      var v = $$.findValueInJson(o, key);
                      if (isUndefined(v)) {
                          v = null;
                      }
                      new_row.push(v);
                  });
                  new_rows.push(new_row);
              });
              data = $$.convertRowsToData(new_rows);
          } else {
              Object.keys(json).forEach(function (key) {
                  new_rows.push([key].concat(json[key]));
              });
              data = $$.convertColumnsToData(new_rows);
          }
          return data;
      };
      c3_chart_internal_fn.findValueInJson = function (object, path) {
          path = path.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties (replace [] with .)
          path = path.replace(/^\./, ''); // strip a leading dot
          var pathArray = path.split('.');
          for (var i = 0; i < pathArray.length; ++i) {
              var k = pathArray[i];
              if (k in object) {
                  object = object[k];
              } else {
                  return;
              }
          }
          return object;
      };
  
      /**
       * Converts the rows to normalized data.
       * @param {any[][]} rows The row data
       * @return {Object[]}
       */
      c3_chart_internal_fn.convertRowsToData = function (rows) {
          var newRows = [];
          var keys = rows[0];
  
          for (var i = 1; i < rows.length; i++) {
              var newRow = {};
              for (var j = 0; j < rows[i].length; j++) {
                  if (isUndefined(rows[i][j])) {
                      throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                  }
                  newRow[keys[j]] = rows[i][j];
              }
              newRows.push(newRow);
          }
          return newRows;
      };
  
      /**
       * Converts the columns to normalized data.
       * @param {any[][]} columns The column data
       * @return {Object[]}
       */
      c3_chart_internal_fn.convertColumnsToData = function (columns) {
          var newRows = [];
  
          for (var i = 0; i < columns.length; i++) {
              var key = columns[i][0];
              for (var j = 1; j < columns[i].length; j++) {
                  if (isUndefined(newRows[j - 1])) {
                      newRows[j - 1] = {};
                  }
                  if (isUndefined(columns[i][j])) {
                      throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
                  }
                  newRows[j - 1][key] = columns[i][j];
              }
          }
  
          return newRows;
      };
  
      c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {
          var $$ = this,
              config = $$.config,
              ids = $$.d3.keys(data[0]).filter($$.isNotX, $$),
              xs = $$.d3.keys(data[0]).filter($$.isX, $$),
              targets;
  
          // save x for update data by load when custom x and c3.x API
          ids.forEach(function (id) {
              var xKey = $$.getXKey(id);
  
              if ($$.isCustomX() || $$.isTimeSeries()) {
                  // if included in input data
                  if (xs.indexOf(xKey) >= 0) {
                      $$.data.xs[id] = (appendXs && $$.data.xs[id] ? $$.data.xs[id] : []).concat(data.map(function (d) {
                          return d[xKey];
                      }).filter(isValue).map(function (rawX, i) {
                          return $$.generateTargetX(rawX, id, i);
                      }));
                  }
                  // if not included in input data, find from preloaded data of other id's x
                  else if (config.data_x) {
                          $$.data.xs[id] = $$.getOtherTargetXs();
                      }
                      // if not included in input data, find from preloaded data
                      else if (notEmpty(config.data_xs)) {
                              $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
                          }
                  // MEMO: if no x included, use same x of current will be used
              } else {
                  $$.data.xs[id] = data.map(function (d, i) {
                      return i;
                  });
              }
          });
  
          // check x is defined
          ids.forEach(function (id) {
              if (!$$.data.xs[id]) {
                  throw new Error('x is not defined for id = "' + id + '".');
              }
          });
  
          // convert to target
          targets = ids.map(function (id, index) {
              var convertedId = config.data_idConverter(id);
              return {
                  id: convertedId,
                  id_org: id,
                  values: data.map(function (d, i) {
                      var xKey = $$.getXKey(id),
                          rawX = d[xKey],
                          value = d[id] !== null && !isNaN(d[id]) ? +d[id] : null,
                          x;
                      // use x as categories if custom x and categorized
                      if ($$.isCustomX() && $$.isCategorized() && !isUndefined(rawX)) {
                          if (index === 0 && i === 0) {
                              config.axis_x_categories = [];
                          }
                          x = config.axis_x_categories.indexOf(rawX);
                          if (x === -1) {
                              x = config.axis_x_categories.length;
                              config.axis_x_categories.push(rawX);
                          }
                      } else {
                          x = $$.generateTargetX(rawX, id, i);
                      }
                      // mark as x = undefined if value is undefined and filter to remove after mapped
                      if (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
                          x = undefined;
                      }
                      return { x: x, value: value, id: convertedId };
                  }).filter(function (v) {
                      return isDefined(v.x);
                  })
              };
          });
  
          // finish targets
          targets.forEach(function (t) {
              var i;
              // sort values by its x
              if (config.data_xSort) {
                  t.values = t.values.sort(function (v1, v2) {
                      var x1 = v1.x || v1.x === 0 ? v1.x : Infinity,
                          x2 = v2.x || v2.x === 0 ? v2.x : Infinity;
                      return x1 - x2;
                  });
              }
              // indexing each value
              i = 0;
              t.values.forEach(function (v) {
                  v.index = i++;
              });
              // this needs to be sorted because its index and value.index is identical
              $$.data.xs[t.id].sort(function (v1, v2) {
                  return v1 - v2;
              });
          });
  
          // cache information about values
          $$.hasNegativeValue = $$.hasNegativeValueInTargets(targets);
          $$.hasPositiveValue = $$.hasPositiveValueInTargets(targets);
  
          // set target types
          if (config.data_type) {
              $$.setTargetType($$.mapToIds(targets).filter(function (id) {
                  return !(id in config.data_types);
              }), config.data_type);
          }
  
          // cache as original id keyed
          targets.forEach(function (d) {
              $$.addCache(d.id_org, d);
          });
  
          return targets;
      };
  
      c3_chart_internal_fn.isX = function (key) {
          var $$ = this,
              config = $$.config;
          return config.data_x && key === config.data_x || notEmpty(config.data_xs) && hasValue(config.data_xs, key);
      };
      c3_chart_internal_fn.isNotX = function (key) {
          return !this.isX(key);
      };
      c3_chart_internal_fn.getXKey = function (id) {
          var $$ = this,
              config = $$.config;
          return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
      };
      c3_chart_internal_fn.getXValuesOfXKey = function (key, targets) {
          var $$ = this,
              xValues,
              ids = targets && notEmpty(targets) ? $$.mapToIds(targets) : [];
          ids.forEach(function (id) {
              if ($$.getXKey(id) === key) {
                  xValues = $$.data.xs[id];
              }
          });
          return xValues;
      };
      c3_chart_internal_fn.getIndexByX = function (x) {
          var $$ = this,
              data = $$.filterByX($$.data.targets, x);
          return data.length ? data[0].index : null;
      };
      c3_chart_internal_fn.getXValue = function (id, i) {
          var $$ = this;
          return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i]) ? $$.data.xs[id][i] : i;
      };
      c3_chart_internal_fn.getOtherTargetXs = function () {
          var $$ = this,
              idsForX = Object.keys($$.data.xs);
          return idsForX.length ? $$.data.xs[idsForX[0]] : null;
      };
      c3_chart_internal_fn.getOtherTargetX = function (index) {
          var xs = this.getOtherTargetXs();
          return xs && index < xs.length ? xs[index] : null;
      };
      c3_chart_internal_fn.addXs = function (xs) {
          var $$ = this;
          Object.keys(xs).forEach(function (id) {
              $$.config.data_xs[id] = xs[id];
          });
      };
      c3_chart_internal_fn.hasMultipleX = function (xs) {
          return this.d3.set(Object.keys(xs).map(function (id) {
              return xs[id];
          })).size() > 1;
      };
      c3_chart_internal_fn.isMultipleX = function () {
          return notEmpty(this.config.data_xs) || !this.config.data_xSort || this.hasType('scatter');
      };
      c3_chart_internal_fn.addName = function (data) {
          var $$ = this,
              name;
          if (data) {
              name = $$.config.data_names[data.id];
              data.name = name !== undefined ? name : data.id;
          }
          return data;
      };
      c3_chart_internal_fn.getValueOnIndex = function (values, index) {
          var valueOnIndex = values.filter(function (v) {
              return v.index === index;
          });
          return valueOnIndex.length ? valueOnIndex[0] : null;
      };
      c3_chart_internal_fn.updateTargetX = function (targets, x) {
          var $$ = this;
          targets.forEach(function (t) {
              t.values.forEach(function (v, i) {
                  v.x = $$.generateTargetX(x[i], t.id, i);
              });
              $$.data.xs[t.id] = x;
          });
      };
      c3_chart_internal_fn.updateTargetXs = function (targets, xs) {
          var $$ = this;
          targets.forEach(function (t) {
              if (xs[t.id]) {
                  $$.updateTargetX([t], xs[t.id]);
              }
          });
      };
      c3_chart_internal_fn.generateTargetX = function (rawX, id, index) {
          var $$ = this,
              x;
          if ($$.isTimeSeries()) {
              x = rawX ? $$.parseDate(rawX) : $$.parseDate($$.getXValue(id, index));
          } else if ($$.isCustomX() && !$$.isCategorized()) {
              x = isValue(rawX) ? +rawX : $$.getXValue(id, index);
          } else {
              x = index;
          }
          return x;
      };
      c3_chart_internal_fn.cloneTarget = function (target) {
          return {
              id: target.id,
              id_org: target.id_org,
              values: target.values.map(function (d) {
                  return { x: d.x, value: d.value, id: d.id };
              })
          };
      };
      c3_chart_internal_fn.updateXs = function () {
          var $$ = this;
          if ($$.data.targets.length) {
              $$.xs = [];
              $$.data.targets[0].values.forEach(function (v) {
                  $$.xs[v.index] = v.x;
              });
          }
      };
      c3_chart_internal_fn.getPrevX = function (i) {
          var x = this.xs[i - 1];
          return typeof x !== 'undefined' ? x : null;
      };
      c3_chart_internal_fn.getNextX = function (i) {
          var x = this.xs[i + 1];
          return typeof x !== 'undefined' ? x : null;
      };
      c3_chart_internal_fn.getMaxDataCount = function () {
          var $$ = this;
          return $$.d3.max($$.data.targets, function (t) {
              return t.values.length;
          });
      };
      c3_chart_internal_fn.getMaxDataCountTarget = function (targets) {
          var length = targets.length,
              max = 0,
              maxTarget;
          if (length > 1) {
              targets.forEach(function (t) {
                  if (t.values.length > max) {
                      maxTarget = t;
                      max = t.values.length;
                  }
              });
          } else {
              maxTarget = length ? targets[0] : null;
          }
          return maxTarget;
      };
      c3_chart_internal_fn.getEdgeX = function (targets) {
          var $$ = this;
          return !targets.length ? [0, 0] : [$$.d3.min(targets, function (t) {
              return t.values[0].x;
          }), $$.d3.max(targets, function (t) {
              return t.values[t.values.length - 1].x;
          })];
      };
      c3_chart_internal_fn.mapToIds = function (targets) {
          return targets.map(function (d) {
              return d.id;
          });
      };
      c3_chart_internal_fn.mapToTargetIds = function (ids) {
          var $$ = this;
          return ids ? [].concat(ids) : $$.mapToIds($$.data.targets);
      };
      c3_chart_internal_fn.hasTarget = function (targets, id) {
          var ids = this.mapToIds(targets),
              i;
          for (i = 0; i < ids.length; i++) {
              if (ids[i] === id) {
                  return true;
              }
          }
          return false;
      };
      c3_chart_internal_fn.isTargetToShow = function (targetId) {
          return this.hiddenTargetIds.indexOf(targetId) < 0;
      };
      c3_chart_internal_fn.isLegendToShow = function (targetId) {
          return this.hiddenLegendIds.indexOf(targetId) < 0;
      };
      c3_chart_internal_fn.filterTargetsToShow = function (targets) {
          var $$ = this;
          return targets.filter(function (t) {
              return $$.isTargetToShow(t.id);
          });
      };
      c3_chart_internal_fn.mapTargetsToUniqueXs = function (targets) {
          var $$ = this;
          var xs = $$.d3.set($$.d3.merge(targets.map(function (t) {
              return t.values.map(function (v) {
                  return +v.x;
              });
          }))).values();
          xs = $$.isTimeSeries() ? xs.map(function (x) {
              return new Date(+x);
          }) : xs.map(function (x) {
              return +x;
          });
          return xs.sort(function (a, b) {
              return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
          });
      };
      c3_chart_internal_fn.addHiddenTargetIds = function (targetIds) {
          targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
          for (var i = 0; i < targetIds.length; i++) {
              if (this.hiddenTargetIds.indexOf(targetIds[i]) < 0) {
                  this.hiddenTargetIds = this.hiddenTargetIds.concat(targetIds[i]);
              }
          }
      };
      c3_chart_internal_fn.removeHiddenTargetIds = function (targetIds) {
          this.hiddenTargetIds = this.hiddenTargetIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
      };
      c3_chart_internal_fn.addHiddenLegendIds = function (targetIds) {
          targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);
          for (var i = 0; i < targetIds.length; i++) {
              if (this.hiddenLegendIds.indexOf(targetIds[i]) < 0) {
                  this.hiddenLegendIds = this.hiddenLegendIds.concat(targetIds[i]);
              }
          }
      };
      c3_chart_internal_fn.removeHiddenLegendIds = function (targetIds) {
          this.hiddenLegendIds = this.hiddenLegendIds.filter(function (id) {
              return targetIds.indexOf(id) < 0;
          });
      };
      c3_chart_internal_fn.getValuesAsIdKeyed = function (targets) {
          var ys = {};
          targets.forEach(function (t) {
              ys[t.id] = [];
              t.values.forEach(function (v) {
                  ys[t.id].push(v.value);
              });
          });
          return ys;
      };
      c3_chart_internal_fn.checkValueInTargets = function (targets, checker) {
          var ids = Object.keys(targets),
              i,
              j,
              values;
          for (i = 0; i < ids.length; i++) {
              values = targets[ids[i]].values;
              for (j = 0; j < values.length; j++) {
                  if (checker(values[j].value)) {
                      return true;
                  }
              }
          }
          return false;
      };
      c3_chart_internal_fn.hasNegativeValueInTargets = function (targets) {
          return this.checkValueInTargets(targets, function (v) {
              return v < 0;
          });
      };
      c3_chart_internal_fn.hasPositiveValueInTargets = function (targets) {
          return this.checkValueInTargets(targets, function (v) {
              return v > 0;
          });
      };
      c3_chart_internal_fn.isOrderDesc = function () {
          var config = this.config;
          return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'desc';
      };
      c3_chart_internal_fn.isOrderAsc = function () {
          var config = this.config;
          return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'asc';
      };
      c3_chart_internal_fn.getOrderFunction = function () {
          var $$ = this,
              config = $$.config,
              orderAsc = $$.isOrderAsc(),
              orderDesc = $$.isOrderDesc();
          if (orderAsc || orderDesc) {
              return function (t1, t2) {
                  var reducer = function reducer(p, c) {
                      return p + Math.abs(c.value);
                  };
                  var t1Sum = t1.values.reduce(reducer, 0),
                      t2Sum = t2.values.reduce(reducer, 0);
                  return orderDesc ? t2Sum - t1Sum : t1Sum - t2Sum;
              };
          } else if (isFunction(config.data_order)) {
              return config.data_order;
          } else if (isArray(config.data_order)) {
              var order = config.data_order;
              return function (t1, t2) {
                  return order.indexOf(t1.id) - order.indexOf(t2.id);
              };
          }
      };
      c3_chart_internal_fn.orderTargets = function (targets) {
          var fct = this.getOrderFunction();
          if (fct) {
              targets.sort(fct);
              if (this.isOrderAsc() || this.isOrderDesc()) {
                  targets.reverse();
              }
          }
          return targets;
      };
      c3_chart_internal_fn.filterByX = function (targets, x) {
          return this.d3.merge(targets.map(function (t) {
              return t.values;
          })).filter(function (v) {
              return v.x - x === 0;
          });
      };
      c3_chart_internal_fn.filterRemoveNull = function (data) {
          return data.filter(function (d) {
              return isValue(d.value);
          });
      };
      c3_chart_internal_fn.filterByXDomain = function (targets, xDomain) {
          return targets.map(function (t) {
              return {
                  id: t.id,
                  id_org: t.id_org,
                  values: t.values.filter(function (v) {
                      return xDomain[0] <= v.x && v.x <= xDomain[1];
                  })
              };
          });
      };
      c3_chart_internal_fn.hasDataLabel = function () {
          var config = this.config;
          if (typeof config.data_labels === 'boolean' && config.data_labels) {
              return true;
          } else if (_typeof(config.data_labels) === 'object' && notEmpty(config.data_labels)) {
              return true;
          }
          return false;
      };
      c3_chart_internal_fn.getDataLabelLength = function (min, max, key) {
          var $$ = this,
              lengths = [0, 0],
              paddingCoef = 1.3;
          $$.selectChart.select('svg').selectAll('.dummy').data([min, max]).enter().append('text').text(function (d) {
              return $$.dataLabelFormat(d.id)(d);
          }).each(function (d, i) {
              lengths[i] = this.getBoundingClientRect()[key] * paddingCoef;
          }).remove();
          return lengths;
      };
      c3_chart_internal_fn.isNoneArc = function (d) {
          return this.hasTarget(this.data.targets, d.id);
      }, c3_chart_internal_fn.isArc = function (d) {
          return 'data' in d && this.hasTarget(this.data.targets, d.data.id);
      };
      c3_chart_internal_fn.findSameXOfValues = function (values, index) {
          var i,
              targetX = values[index].x,
              sames = [];
          for (i = index - 1; i >= 0; i--) {
              if (targetX !== values[i].x) {
                  break;
              }
              sames.push(values[i]);
          }
          for (i = index; i < values.length; i++) {
              if (targetX !== values[i].x) {
                  break;
              }
              sames.push(values[i]);
          }
          return sames;
      };
  
      c3_chart_internal_fn.findClosestFromTargets = function (targets, pos) {
          var $$ = this,
              candidates;
  
          // map to array of closest points of each target
          candidates = targets.map(function (target) {
              return $$.findClosest(target.values, pos);
          });
  
          // decide closest point and return
          return $$.findClosest(candidates, pos);
      };
      c3_chart_internal_fn.findClosest = function (values, pos) {
          var $$ = this,
              minDist = $$.config.point_sensitivity,
              closest;
  
          // find mouseovering bar
          values.filter(function (v) {
              return v && $$.isBarType(v.id);
          }).forEach(function (v) {
              var shape = $$.main.select('.' + CLASS.bars + $$.getTargetSelectorSuffix(v.id) + ' .' + CLASS.bar + '-' + v.index).node();
              if (!closest && $$.isWithinBar(shape)) {
                  closest = v;
              }
          });
  
          // find closest point from non-bar
          values.filter(function (v) {
              return v && !$$.isBarType(v.id);
          }).forEach(function (v) {
              var d = $$.dist(v, pos);
              if (d < minDist) {
                  minDist = d;
                  closest = v;
              }
          });
  
          return closest;
      };
      c3_chart_internal_fn.dist = function (data, pos) {
          var $$ = this,
              config = $$.config,
              xIndex = config.axis_rotated ? 1 : 0,
              yIndex = config.axis_rotated ? 0 : 1,
              y = $$.circleY(data, data.index),
              x = $$.x(data.x);
          return Math.sqrt(Math.pow(x - pos[xIndex], 2) + Math.pow(y - pos[yIndex], 2));
      };
      c3_chart_internal_fn.convertValuesToStep = function (values) {
          var converted = [].concat(values),
              i;
  
          if (!this.isCategorized()) {
              return values;
          }
  
          for (i = values.length + 1; 0 < i; i--) {
              converted[i] = converted[i - 1];
          }
  
          converted[0] = {
              x: converted[0].x - 1,
              value: converted[0].value,
              id: converted[0].id
          };
          converted[values.length + 1] = {
              x: converted[values.length].x + 1,
              value: converted[values.length].value,
              id: converted[values.length].id
          };
  
          return converted;
      };
      c3_chart_internal_fn.updateDataAttributes = function (name, attrs) {
          var $$ = this,
              config = $$.config,
              current = config['data_' + name];
          if (typeof attrs === 'undefined') {
              return current;
          }
          Object.keys(attrs).forEach(function (id) {
              current[id] = attrs[id];
          });
          $$.redraw({ withLegend: true });
          return current;
      };
  
      c3_chart_internal_fn.load = function (targets, args) {
          var $$ = this;
          if (targets) {
              // filter loading targets if needed
              if (args.filter) {
                  targets = targets.filter(args.filter);
              }
              // set type if args.types || args.type specified
              if (args.type || args.types) {
                  targets.forEach(function (t) {
                      var type = args.types && args.types[t.id] ? args.types[t.id] : args.type;
                      $$.setTargetType(t.id, type);
                  });
              }
              // Update/Add data
              $$.data.targets.forEach(function (d) {
                  for (var i = 0; i < targets.length; i++) {
                      if (d.id === targets[i].id) {
                          d.values = targets[i].values;
                          targets.splice(i, 1);
                          break;
                      }
                  }
              });
              $$.data.targets = $$.data.targets.concat(targets); // add remained
          }
  
          // Set targets
          $$.updateTargets($$.data.targets);
  
          // Redraw with new targets
          $$.redraw({ withUpdateOrgXDomain: true, withUpdateXDomain: true, withLegend: true });
  
          if (args.done) {
              args.done();
          }
      };
      c3_chart_internal_fn.loadFromArgs = function (args) {
          var $$ = this;
          if (args.data) {
              $$.load($$.convertDataToTargets(args.data), args);
          } else if (args.url) {
              $$.convertUrlToData(args.url, args.mimeType, args.headers, args.keys, function (data) {
                  $$.load($$.convertDataToTargets(data), args);
              });
          } else if (args.json) {
              $$.load($$.convertDataToTargets($$.convertJsonToData(args.json, args.keys)), args);
          } else if (args.rows) {
              $$.load($$.convertDataToTargets($$.convertRowsToData(args.rows)), args);
          } else if (args.columns) {
              $$.load($$.convertDataToTargets($$.convertColumnsToData(args.columns)), args);
          } else {
              $$.load(null, args);
          }
      };
      c3_chart_internal_fn.unload = function (targetIds, done) {
          var $$ = this;
          if (!done) {
              done = function done() {};
          }
          // filter existing target
          targetIds = targetIds.filter(function (id) {
              return $$.hasTarget($$.data.targets, id);
          });
          // If no target, call done and return
          if (!targetIds || targetIds.length === 0) {
              done();
              return;
          }
          $$.svg.selectAll(targetIds.map(function (id) {
              return $$.selectorTarget(id);
          })).transition().style('opacity', 0).remove().call($$.endall, done);
          targetIds.forEach(function (id) {
              // Reset fadein for future load
              $$.withoutFadeIn[id] = false;
              // Remove target's elements
              if ($$.legend) {
                  $$.legend.selectAll('.' + CLASS.legendItem + $$.getTargetSelectorSuffix(id)).remove();
              }
              // Remove target
              $$.data.targets = $$.data.targets.filter(function (t) {
                  return t.id !== id;
              });
          });
      };
  
      c3_chart_internal_fn.getYDomainMin = function (targets) {
          var $$ = this,
              config = $$.config,
              ids = $$.mapToIds(targets),
              ys = $$.getValuesAsIdKeyed(targets),
              j,
              k,
              baseId,
              idsInGroup,
              id,
              hasNegativeValue;
          if (config.data_groups.length > 0) {
              hasNegativeValue = $$.hasNegativeValueInTargets(targets);
              for (j = 0; j < config.data_groups.length; j++) {
                  // Determine baseId
                  idsInGroup = config.data_groups[j].filter(function (id) {
                      return ids.indexOf(id) >= 0;
                  });
                  if (idsInGroup.length === 0) {
                      continue;
                  }
                  baseId = idsInGroup[0];
                  // Consider negative values
                  if (hasNegativeValue && ys[baseId]) {
                      ys[baseId].forEach(function (v, i) {
                          ys[baseId][i] = v < 0 ? v : 0;
                      });
                  }
                  // Compute min
                  for (k = 1; k < idsInGroup.length; k++) {
                      id = idsInGroup[k];
                      if (!ys[id]) {
                          continue;
                      }
                      ys[id].forEach(function (v, i) {
                          if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasNegativeValue && +v > 0)) {
                              ys[baseId][i] += +v;
                          }
                      });
                  }
              }
          }
          return $$.d3.min(Object.keys(ys).map(function (key) {
              return $$.d3.min(ys[key]);
          }));
      };
      c3_chart_internal_fn.getYDomainMax = function (targets) {
          var $$ = this,
              config = $$.config,
              ids = $$.mapToIds(targets),
              ys = $$.getValuesAsIdKeyed(targets),
              j,
              k,
              baseId,
              idsInGroup,
              id,
              hasPositiveValue;
          if (config.data_groups.length > 0) {
              hasPositiveValue = $$.hasPositiveValueInTargets(targets);
              for (j = 0; j < config.data_groups.length; j++) {
                  // Determine baseId
                  idsInGroup = config.data_groups[j].filter(function (id) {
                      return ids.indexOf(id) >= 0;
                  });
                  if (idsInGroup.length === 0) {
                      continue;
                  }
                  baseId = idsInGroup[0];
                  // Consider positive values
                  if (hasPositiveValue && ys[baseId]) {
                      ys[baseId].forEach(function (v, i) {
                          ys[baseId][i] = v > 0 ? v : 0;
                      });
                  }
                  // Compute max
                  for (k = 1; k < idsInGroup.length; k++) {
                      id = idsInGroup[k];
                      if (!ys[id]) {
                          continue;
                      }
                      ys[id].forEach(function (v, i) {
                          if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasPositiveValue && +v < 0)) {
                              ys[baseId][i] += +v;
                          }
                      });
                  }
              }
          }
          return $$.d3.max(Object.keys(ys).map(function (key) {
              return $$.d3.max(ys[key]);
          }));
      };
      c3_chart_internal_fn.getYDomain = function (targets, axisId, xDomain) {
          var $$ = this,
              config = $$.config,
              targetsByAxisId = targets.filter(function (t) {
              return $$.axis.getId(t.id) === axisId;
          }),
              yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId,
              yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
              yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
              yDomainMin = $$.getYDomainMin(yTargets),
              yDomainMax = $$.getYDomainMax(yTargets),
              domain,
              domainLength,
              padding,
              padding_top,
              padding_bottom,
              center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
              yDomainAbs,
              lengths,
              diff,
              ratio,
              isAllPositive,
              isAllNegative,
              isZeroBased = $$.hasType('bar', yTargets) && config.bar_zerobased || $$.hasType('area', yTargets) && config.area_zerobased,
              isInverted = axisId === 'y2' ? config.axis_y2_inverted : config.axis_y_inverted,
              showHorizontalDataLabel = $$.hasDataLabel() && config.axis_rotated,
              showVerticalDataLabel = $$.hasDataLabel() && !config.axis_rotated;
  
          // MEMO: avoid inverting domain unexpectedly
          yDomainMin = isValue(yMin) ? yMin : isValue(yMax) ? yDomainMin < yMax ? yDomainMin : yMax - 10 : yDomainMin;
          yDomainMax = isValue(yMax) ? yMax : isValue(yMin) ? yMin < yDomainMax ? yDomainMax : yMin + 10 : yDomainMax;
  
          if (yTargets.length === 0) {
              // use current domain if target of axisId is none
              return axisId === 'y2' ? $$.y2.domain() : $$.y.domain();
          }
          if (isNaN(yDomainMin)) {
              // set minimum to zero when not number
              yDomainMin = 0;
          }
          if (isNaN(yDomainMax)) {
              // set maximum to have same value as yDomainMin
              yDomainMax = yDomainMin;
          }
          if (yDomainMin === yDomainMax) {
              yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
          }
          isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
          isAllNegative = yDomainMin <= 0 && yDomainMax <= 0;
  
          // Cancel zerobased if axis_*_min / axis_*_max specified
          if (isValue(yMin) && isAllPositive || isValue(yMax) && isAllNegative) {
              isZeroBased = false;
          }
  
          // Bar/Area chart should be 0-based if all positive|negative
          if (isZeroBased) {
              if (isAllPositive) {
                  yDomainMin = 0;
              }
              if (isAllNegative) {
                  yDomainMax = 0;
              }
          }
  
          domainLength = Math.abs(yDomainMax - yDomainMin);
          padding = padding_top = padding_bottom = domainLength * 0.1;
  
          if (typeof center !== 'undefined') {
              yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
              yDomainMax = center + yDomainAbs;
              yDomainMin = center - yDomainAbs;
          }
          // add padding for data label
          if (showHorizontalDataLabel) {
              lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'width');
              diff = diffDomain($$.y.range());
              ratio = [lengths[0] / diff, lengths[1] / diff];
              padding_top += domainLength * (ratio[1] / (1 - ratio[0] - ratio[1]));
              padding_bottom += domainLength * (ratio[0] / (1 - ratio[0] - ratio[1]));
          } else if (showVerticalDataLabel) {
              lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'height');
              padding_top += $$.axis.convertPixelsToAxisPadding(lengths[1], domainLength);
              padding_bottom += $$.axis.convertPixelsToAxisPadding(lengths[0], domainLength);
          }
          if (axisId === 'y' && notEmpty(config.axis_y_padding)) {
              padding_top = $$.axis.getPadding(config.axis_y_padding, 'top', padding_top, domainLength);
              padding_bottom = $$.axis.getPadding(config.axis_y_padding, 'bottom', padding_bottom, domainLength);
          }
          if (axisId === 'y2' && notEmpty(config.axis_y2_padding)) {
              padding_top = $$.axis.getPadding(config.axis_y2_padding, 'top', padding_top, domainLength);
              padding_bottom = $$.axis.getPadding(config.axis_y2_padding, 'bottom', padding_bottom, domainLength);
          }
          // Bar/Area chart should be 0-based if all positive|negative
          if (isZeroBased) {
              if (isAllPositive) {
                  padding_bottom = yDomainMin;
              }
              if (isAllNegative) {
                  padding_top = -yDomainMax;
              }
          }
          domain = [yDomainMin - padding_bottom, yDomainMax + padding_top];
          return isInverted ? domain.reverse() : domain;
      };
      c3_chart_internal_fn.getXDomainMin = function (targets) {
          var $$ = this,
              config = $$.config;
          return isDefined(config.axis_x_min) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min : $$.d3.min(targets, function (t) {
              return $$.d3.min(t.values, function (v) {
                  return v.x;
              });
          });
      };
      c3_chart_internal_fn.getXDomainMax = function (targets) {
          var $$ = this,
              config = $$.config;
          return isDefined(config.axis_x_max) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max : $$.d3.max(targets, function (t) {
              return $$.d3.max(t.values, function (v) {
                  return v.x;
              });
          });
      };
      c3_chart_internal_fn.getXDomainPadding = function (domain) {
          var $$ = this,
              config = $$.config,
              diff = domain[1] - domain[0],
              maxDataCount,
              padding,
              paddingLeft,
              paddingRight;
          if ($$.isCategorized()) {
              padding = 0;
          } else if ($$.hasType('bar')) {
              maxDataCount = $$.getMaxDataCount();
              padding = maxDataCount > 1 ? diff / (maxDataCount - 1) / 2 : 0.5;
          } else {
              padding = diff * 0.01;
          }
          if (_typeof(config.axis_x_padding) === 'object' && notEmpty(config.axis_x_padding)) {
              paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
              paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
          } else if (typeof config.axis_x_padding === 'number') {
              paddingLeft = paddingRight = config.axis_x_padding;
          } else {
              paddingLeft = paddingRight = padding;
          }
          return { left: paddingLeft, right: paddingRight };
      };
      c3_chart_internal_fn.getXDomain = function (targets) {
          var $$ = this,
              xDomain = [$$.getXDomainMin(targets), $$.getXDomainMax(targets)],
              firstX = xDomain[0],
              lastX = xDomain[1],
              padding = $$.getXDomainPadding(xDomain),
              min = 0,
              max = 0;
          // show center of x domain if min and max are the same
          if (firstX - lastX === 0 && !$$.isCategorized()) {
              if ($$.isTimeSeries()) {
                  firstX = new Date(firstX.getTime() * 0.5);
                  lastX = new Date(lastX.getTime() * 1.5);
              } else {
                  firstX = firstX === 0 ? 1 : firstX * 0.5;
                  lastX = lastX === 0 ? -1 : lastX * 1.5;
              }
          }
          if (firstX || firstX === 0) {
              min = $$.isTimeSeries() ? new Date(firstX.getTime() - padding.left) : firstX - padding.left;
          }
          if (lastX || lastX === 0) {
              max = $$.isTimeSeries() ? new Date(lastX.getTime() + padding.right) : lastX + padding.right;
          }
          return [min, max];
      };
      c3_chart_internal_fn.updateXDomain = function (targets, withUpdateXDomain, withUpdateOrgXDomain, withTrim, domain) {
          var $$ = this,
              config = $$.config;
  
          if (withUpdateOrgXDomain) {
              $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
              $$.orgXDomain = $$.x.domain();
              if (config.zoom_enabled) {
                  $$.zoom.scale($$.x).updateScaleExtent();
              }
              $$.subX.domain($$.x.domain());
              if ($$.brush) {
                  $$.brush.scale($$.subX);
              }
          }
          if (withUpdateXDomain) {
              $$.x.domain(domain ? domain : !$$.brush || $$.brush.empty() ? $$.orgXDomain : $$.brush.extent());
              if (config.zoom_enabled) {
                  $$.zoom.scale($$.x).updateScaleExtent();
              }
          }
  
          // Trim domain when too big by zoom mousemove event
          if (withTrim) {
              $$.x.domain($$.trimXDomain($$.x.orgDomain()));
          }
  
          return $$.x.domain();
      };
      c3_chart_internal_fn.trimXDomain = function (domain) {
          var zoomDomain = this.getZoomDomain(),
              min = zoomDomain[0],
              max = zoomDomain[1];
          if (domain[0] <= min) {
              domain[1] = +domain[1] + (min - domain[0]);
              domain[0] = min;
          }
          if (max <= domain[1]) {
              domain[0] = +domain[0] - (domain[1] - max);
              domain[1] = max;
          }
          return domain;
      };
  
      c3_chart_internal_fn.drag = function (mouse) {
          var $$ = this,
              config = $$.config,
              main = $$.main,
              d3 = $$.d3;
          var sx, sy, mx, my, minX, maxX, minY, maxY;
  
          if ($$.hasArcType()) {
              return;
          }
          if (!config.data_selection_enabled) {
              return;
          } // do nothing if not selectable
          if (config.zoom_enabled && !$$.zoom.altDomain) {
              return;
          } // skip if zoomable because of conflict drag dehavior
          if (!config.data_selection_multiple) {
              return;
          } // skip when single selection because drag is used for multiple selection
  
          sx = $$.dragStart[0];
          sy = $$.dragStart[1];
          mx = mouse[0];
          my = mouse[1];
          minX = Math.min(sx, mx);
          maxX = Math.max(sx, mx);
          minY = config.data_selection_grouped ? $$.margin.top : Math.min(sy, my);
          maxY = config.data_selection_grouped ? $$.height : Math.max(sy, my);
  
          main.select('.' + CLASS.dragarea).attr('x', minX).attr('y', minY).attr('width', maxX - minX).attr('height', maxY - minY);
          // TODO: binary search when multiple xs
          main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).filter(function (d) {
              return config.data_selection_isselectable(d);
          }).each(function (d, i) {
              var shape = d3.select(this),
                  isSelected = shape.classed(CLASS.SELECTED),
                  isIncluded = shape.classed(CLASS.INCLUDED),
                  _x,
                  _y,
                  _w,
                  _h,
                  toggle,
                  isWithin = false,
                  box;
              if (shape.classed(CLASS.circle)) {
                  _x = shape.attr("cx") * 1;
                  _y = shape.attr("cy") * 1;
                  toggle = $$.togglePoint;
                  isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
              } else if (shape.classed(CLASS.bar)) {
                  box = getPathBox(this);
                  _x = box.x;
                  _y = box.y;
                  _w = box.width;
                  _h = box.height;
                  toggle = $$.togglePath;
                  isWithin = !(maxX < _x || _x + _w < minX) && !(maxY < _y || _y + _h < minY);
              } else {
                  // line/area selection not supported yet
                  return;
              }
              if (isWithin ^ isIncluded) {
                  shape.classed(CLASS.INCLUDED, !isIncluded);
                  // TODO: included/unincluded callback here
                  shape.classed(CLASS.SELECTED, !isSelected);
                  toggle.call($$, !isSelected, shape, d, i);
              }
          });
      };
  
      c3_chart_internal_fn.dragstart = function (mouse) {
          var $$ = this,
              config = $$.config;
          if ($$.hasArcType()) {
              return;
          }
          if (!config.data_selection_enabled) {
              return;
          } // do nothing if not selectable
          $$.dragStart = mouse;
          $$.main.select('.' + CLASS.chart).append('rect').attr('class', CLASS.dragarea).style('opacity', 0.1);
          $$.dragging = true;
      };
  
      c3_chart_internal_fn.dragend = function () {
          var $$ = this,
              config = $$.config;
          if ($$.hasArcType()) {
              return;
          }
          if (!config.data_selection_enabled) {
              return;
          } // do nothing if not selectable
          $$.main.select('.' + CLASS.dragarea).transition().duration(100).style('opacity', 0).remove();
          $$.main.selectAll('.' + CLASS.shape).classed(CLASS.INCLUDED, false);
          $$.dragging = false;
      };
  
      c3_chart_internal_fn.getYFormat = function (forArc) {
          var $$ = this,
              formatForY = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
              formatForY2 = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format;
          return function (v, ratio, id) {
              var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY;
              return format.call($$, v, ratio);
          };
      };
      c3_chart_internal_fn.yFormat = function (v) {
          var $$ = this,
              config = $$.config,
              format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
          return format(v);
      };
      c3_chart_internal_fn.y2Format = function (v) {
          var $$ = this,
              config = $$.config,
              format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
          return format(v);
      };
      c3_chart_internal_fn.defaultValueFormat = function (v) {
          return isValue(v) ? +v : "";
      };
      c3_chart_internal_fn.defaultArcValueFormat = function (v, ratio) {
          return (ratio * 100).toFixed(1) + '%';
      };
      c3_chart_internal_fn.dataLabelFormat = function (targetId) {
          var $$ = this,
              data_labels = $$.config.data_labels,
              format,
              defaultFormat = function defaultFormat(v) {
              return isValue(v) ? +v : "";
          };
          // find format according to axis id
          if (typeof data_labels.format === 'function') {
              format = data_labels.format;
          } else if (_typeof(data_labels.format) === 'object') {
              if (data_labels.format[targetId]) {
                  format = data_labels.format[targetId] === true ? defaultFormat : data_labels.format[targetId];
              } else {
                  format = function format() {
                      return '';
                  };
              }
          } else {
              format = defaultFormat;
          }
          return format;
      };
  
      c3_chart_internal_fn.initGrid = function () {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3;
          $$.grid = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid);
          if (config.grid_x_show) {
              $$.grid.append("g").attr("class", CLASS.xgrids);
          }
          if (config.grid_y_show) {
              $$.grid.append('g').attr('class', CLASS.ygrids);
          }
          if (config.grid_focus_show) {
              $$.grid.append('g').attr("class", CLASS.xgridFocus).append('line').attr('class', CLASS.xgridFocus);
          }
          $$.xgrid = d3.selectAll([]);
          if (!config.grid_lines_front) {
              $$.initGridLines();
          }
      };
      c3_chart_internal_fn.initGridLines = function () {
          var $$ = this,
              d3 = $$.d3;
          $$.gridLines = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid + ' ' + CLASS.gridLines);
          $$.gridLines.append('g').attr("class", CLASS.xgridLines);
          $$.gridLines.append('g').attr('class', CLASS.ygridLines);
          $$.xgridLines = d3.selectAll([]);
      };
      c3_chart_internal_fn.updateXGrid = function (withoutUpdate) {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3,
              xgridData = $$.generateGridData(config.grid_x_type, $$.x),
              tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;
  
          $$.xgridAttr = config.axis_rotated ? {
              'x1': 0,
              'x2': $$.width,
              'y1': function y1(d) {
                  return $$.x(d) - tickOffset;
              },
              'y2': function y2(d) {
                  return $$.x(d) - tickOffset;
              }
          } : {
              'x1': function x1(d) {
                  return $$.x(d) + tickOffset;
              },
              'x2': function x2(d) {
                  return $$.x(d) + tickOffset;
              },
              'y1': 0,
              'y2': $$.height
          };
  
          $$.xgrid = $$.main.select('.' + CLASS.xgrids).selectAll('.' + CLASS.xgrid).data(xgridData);
          $$.xgrid.enter().append('line').attr("class", CLASS.xgrid);
          if (!withoutUpdate) {
              $$.xgrid.attr($$.xgridAttr).style("opacity", function () {
                  return +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1') === (config.axis_rotated ? $$.height : 0) ? 0 : 1;
              });
          }
          $$.xgrid.exit().remove();
      };
  
      c3_chart_internal_fn.updateYGrid = function () {
          var $$ = this,
              config = $$.config,
              gridValues = $$.yAxis.tickValues() || $$.y.ticks(config.grid_y_ticks);
          $$.ygrid = $$.main.select('.' + CLASS.ygrids).selectAll('.' + CLASS.ygrid).data(gridValues);
          $$.ygrid.enter().append('line').attr('class', CLASS.ygrid);
          $$.ygrid.attr("x1", config.axis_rotated ? $$.y : 0).attr("x2", config.axis_rotated ? $$.y : $$.width).attr("y1", config.axis_rotated ? 0 : $$.y).attr("y2", config.axis_rotated ? $$.height : $$.y);
          $$.ygrid.exit().remove();
          $$.smoothLines($$.ygrid, 'grid');
      };
  
      c3_chart_internal_fn.gridTextAnchor = function (d) {
          return d.position ? d.position : "end";
      };
      c3_chart_internal_fn.gridTextDx = function (d) {
          return d.position === 'start' ? 4 : d.position === 'middle' ? 0 : -4;
      };
      c3_chart_internal_fn.xGridTextX = function (d) {
          return d.position === 'start' ? -this.height : d.position === 'middle' ? -this.height / 2 : 0;
      };
      c3_chart_internal_fn.yGridTextX = function (d) {
          return d.position === 'start' ? 0 : d.position === 'middle' ? this.width / 2 : this.width;
      };
      c3_chart_internal_fn.updateGrid = function (duration) {
          var $$ = this,
              main = $$.main,
              config = $$.config,
              xgridLine,
              ygridLine,
              yv;
  
          // hide if arc type
          $$.grid.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
  
          main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
          if (config.grid_x_show) {
              $$.updateXGrid();
          }
          $$.xgridLines = main.select('.' + CLASS.xgridLines).selectAll('.' + CLASS.xgridLine).data(config.grid_x_lines);
          // enter
          xgridLine = $$.xgridLines.enter().append('g').attr("class", function (d) {
              return CLASS.xgridLine + (d['class'] ? ' ' + d['class'] : '');
          });
          xgridLine.append('line').style("opacity", 0);
          xgridLine.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "" : "rotate(-90)").attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0);
          // udpate
          // done in d3.transition() of the end of this function
          // exit
          $$.xgridLines.exit().transition().duration(duration).style("opacity", 0).remove();
  
          // Y-Grid
          if (config.grid_y_show) {
              $$.updateYGrid();
          }
          $$.ygridLines = main.select('.' + CLASS.ygridLines).selectAll('.' + CLASS.ygridLine).data(config.grid_y_lines);
          // enter
          ygridLine = $$.ygridLines.enter().append('g').attr("class", function (d) {
              return CLASS.ygridLine + (d['class'] ? ' ' + d['class'] : '');
          });
          ygridLine.append('line').style("opacity", 0);
          ygridLine.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "rotate(-90)" : "").attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0);
          // update
          yv = $$.yv.bind($$);
          $$.ygridLines.select('line').transition().duration(duration).attr("x1", config.axis_rotated ? yv : 0).attr("x2", config.axis_rotated ? yv : $$.width).attr("y1", config.axis_rotated ? 0 : yv).attr("y2", config.axis_rotated ? $$.height : yv).style("opacity", 1);
          $$.ygridLines.select('text').transition().duration(duration).attr("x", config.axis_rotated ? $$.xGridTextX.bind($$) : $$.yGridTextX.bind($$)).attr("y", yv).text(function (d) {
              return d.text;
          }).style("opacity", 1);
          // exit
          $$.ygridLines.exit().transition().duration(duration).style("opacity", 0).remove();
      };
      c3_chart_internal_fn.redrawGrid = function (withTransition) {
          var $$ = this,
              config = $$.config,
              xv = $$.xv.bind($$),
              lines = $$.xgridLines.select('line'),
              texts = $$.xgridLines.select('text');
          return [(withTransition ? lines.transition() : lines).attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv).attr("y1", config.axis_rotated ? xv : 0).attr("y2", config.axis_rotated ? xv : $$.height).style("opacity", 1), (withTransition ? texts.transition() : texts).attr("x", config.axis_rotated ? $$.yGridTextX.bind($$) : $$.xGridTextX.bind($$)).attr("y", xv).text(function (d) {
              return d.text;
          }).style("opacity", 1)];
      };
      c3_chart_internal_fn.showXGridFocus = function (selectedData) {
          var $$ = this,
              config = $$.config,
              dataToShow = selectedData.filter(function (d) {
              return d && isValue(d.value);
          }),
              focusEl = $$.main.selectAll('line.' + CLASS.xgridFocus),
              xx = $$.xx.bind($$);
          if (!config.tooltip_show) {
              return;
          }
          // Hide when scatter plot exists
          if ($$.hasType('scatter') || $$.hasArcType()) {
              return;
          }
          focusEl.style("visibility", "visible").data([dataToShow[0]]).attr(config.axis_rotated ? 'y1' : 'x1', xx).attr(config.axis_rotated ? 'y2' : 'x2', xx);
          $$.smoothLines(focusEl, 'grid');
      };
      c3_chart_internal_fn.hideXGridFocus = function () {
          this.main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
      };
      c3_chart_internal_fn.updateXgridFocus = function () {
          var $$ = this,
              config = $$.config;
          $$.main.select('line.' + CLASS.xgridFocus).attr("x1", config.axis_rotated ? 0 : -10).attr("x2", config.axis_rotated ? $$.width : -10).attr("y1", config.axis_rotated ? -10 : 0).attr("y2", config.axis_rotated ? -10 : $$.height);
      };
      c3_chart_internal_fn.generateGridData = function (type, scale) {
          var $$ = this,
              gridData = [],
              xDomain,
              firstYear,
              lastYear,
              i,
              tickNum = $$.main.select("." + CLASS.axisX).selectAll('.tick').size();
          if (type === 'year') {
              xDomain = $$.getXDomain();
              firstYear = xDomain[0].getFullYear();
              lastYear = xDomain[1].getFullYear();
              for (i = firstYear; i <= lastYear; i++) {
                  gridData.push(new Date(i + '-01-01 00:00:00'));
              }
          } else {
              gridData = scale.ticks(10);
              if (gridData.length > tickNum) {
                  // use only int
                  gridData = gridData.filter(function (d) {
                      return ("" + d).indexOf('.') < 0;
                  });
              }
          }
          return gridData;
      };
      c3_chart_internal_fn.getGridFilterToRemove = function (params) {
          return params ? function (line) {
              var found = false;
              [].concat(params).forEach(function (param) {
                  if ('value' in param && line.value === param.value || 'class' in param && line['class'] === param['class']) {
                      found = true;
                  }
              });
              return found;
          } : function () {
              return true;
          };
      };
      c3_chart_internal_fn.removeGridLines = function (params, forX) {
          var $$ = this,
              config = $$.config,
              toRemove = $$.getGridFilterToRemove(params),
              toShow = function toShow(line) {
              return !toRemove(line);
          },
              classLines = forX ? CLASS.xgridLines : CLASS.ygridLines,
              classLine = forX ? CLASS.xgridLine : CLASS.ygridLine;
          $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove).transition().duration(config.transition_duration).style('opacity', 0).remove();
          if (forX) {
              config.grid_x_lines = config.grid_x_lines.filter(toShow);
          } else {
              config.grid_y_lines = config.grid_y_lines.filter(toShow);
          }
      };
  
      c3_chart_internal_fn.initEventRect = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.eventRects).style('fill-opacity', 0);
      };
      c3_chart_internal_fn.redrawEventRect = function () {
          var $$ = this,
              config = $$.config,
              eventRectUpdate,
              maxDataCountTarget,
              isMultipleX = $$.isMultipleX();
  
          // rects for mouseover
          var eventRects = $$.main.select('.' + CLASS.eventRects).style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null).classed(CLASS.eventRectsMultiple, isMultipleX).classed(CLASS.eventRectsSingle, !isMultipleX);
  
          // clear old rects
          eventRects.selectAll('.' + CLASS.eventRect).remove();
  
          // open as public variable
          $$.eventRect = eventRects.selectAll('.' + CLASS.eventRect);
  
          if (isMultipleX) {
              eventRectUpdate = $$.eventRect.data([0]);
              // enter : only one rect will be added
              $$.generateEventRectsForMultipleXs(eventRectUpdate.enter());
              // update
              $$.updateEventRect(eventRectUpdate);
              // exit : not needed because always only one rect exists
          } else {
              // Set data and update $$.eventRect
              maxDataCountTarget = $$.getMaxDataCountTarget($$.data.targets);
              eventRects.datum(maxDataCountTarget ? maxDataCountTarget.values : []);
              $$.eventRect = eventRects.selectAll('.' + CLASS.eventRect);
              eventRectUpdate = $$.eventRect.data(function (d) {
                  return d;
              });
              // enter
              $$.generateEventRectsForSingleX(eventRectUpdate.enter());
              // update
              $$.updateEventRect(eventRectUpdate);
              // exit
              eventRectUpdate.exit().remove();
          }
      };
      c3_chart_internal_fn.updateEventRect = function (eventRectUpdate) {
          var $$ = this,
              config = $$.config,
              x,
              y,
              w,
              h,
              rectW,
              rectX;
  
          // set update selection if null
          eventRectUpdate = eventRectUpdate || $$.eventRect.data(function (d) {
              return d;
          });
  
          if ($$.isMultipleX()) {
              // TODO: rotated not supported yet
              x = 0;
              y = 0;
              w = $$.width;
              h = $$.height;
          } else {
              if (($$.isCustomX() || $$.isTimeSeries()) && !$$.isCategorized()) {
  
                  // update index for x that is used by prevX and nextX
                  $$.updateXs();
  
                  rectW = function rectW(d) {
                      var prevX = $$.getPrevX(d.index),
                          nextX = $$.getNextX(d.index);
  
                      // if there this is a single data point make the eventRect full width (or height)
                      if (prevX === null && nextX === null) {
                          return config.axis_rotated ? $$.height : $$.width;
                      }
  
                      if (prevX === null) {
                          prevX = $$.x.domain()[0];
                      }
                      if (nextX === null) {
                          nextX = $$.x.domain()[1];
                      }
  
                      return Math.max(0, ($$.x(nextX) - $$.x(prevX)) / 2);
                  };
                  rectX = function rectX(d) {
                      var prevX = $$.getPrevX(d.index),
                          nextX = $$.getNextX(d.index),
                          thisX = $$.data.xs[d.id][d.index];
  
                      // if there this is a single data point position the eventRect at 0
                      if (prevX === null && nextX === null) {
                          return 0;
                      }
  
                      if (prevX === null) {
                          prevX = $$.x.domain()[0];
                      }
  
                      return ($$.x(thisX) + $$.x(prevX)) / 2;
                  };
              } else {
                  rectW = $$.getEventRectWidth();
                  rectX = function rectX(d) {
                      return $$.x(d.x) - rectW / 2;
                  };
              }
              x = config.axis_rotated ? 0 : rectX;
              y = config.axis_rotated ? rectX : 0;
              w = config.axis_rotated ? $$.width : rectW;
              h = config.axis_rotated ? rectW : $$.height;
          }
  
          eventRectUpdate.attr('class', $$.classEvent.bind($$)).attr("x", x).attr("y", y).attr("width", w).attr("height", h);
      };
      c3_chart_internal_fn.generateEventRectsForSingleX = function (eventRectEnter) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config;
          eventRectEnter.append("rect").attr("class", $$.classEvent.bind($$)).style("cursor", config.data_selection_enabled && config.data_selection_grouped ? "pointer" : null).on('mouseover', function (d) {
              var index = d.index;
  
              if ($$.dragging || $$.flowing) {
                  return;
              } // do nothing while dragging/flowing
              if ($$.hasArcType()) {
                  return;
              }
  
              // Expand shapes for selection
              if (config.point_focus_expand_enabled) {
                  $$.expandCircles(index, null, true);
              }
              $$.expandBars(index, null, true);
  
              // Call event handler
              $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                  config.data_onmouseover.call($$.api, d);
              });
          }).on('mouseout', function (d) {
              var index = d.index;
              if (!$$.config) {
                  return;
              } // chart is destroyed
              if ($$.hasArcType()) {
                  return;
              }
              $$.hideXGridFocus();
              $$.hideTooltip();
              // Undo expanded shapes
              $$.unexpandCircles();
              $$.unexpandBars();
              // Call event handler
              $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                  config.data_onmouseout.call($$.api, d);
              });
          }).on('mousemove', function (d) {
              var selectedData,
                  index = d.index,
                  eventRect = $$.svg.select('.' + CLASS.eventRect + '-' + index);
  
              if ($$.dragging || $$.flowing) {
                  return;
              } // do nothing while dragging/flowing
              if ($$.hasArcType()) {
                  return;
              }
  
              if ($$.isStepType(d) && $$.config.line_step_type === 'step-after' && d3.mouse(this)[0] < $$.x($$.getXValue(d.id, index))) {
                  index -= 1;
              }
  
              // Show tooltip
              selectedData = $$.filterTargetsToShow($$.data.targets).map(function (t) {
                  return $$.addName($$.getValueOnIndex(t.values, index));
              });
  
              if (config.tooltip_grouped) {
                  $$.showTooltip(selectedData, this);
                  $$.showXGridFocus(selectedData);
              }
  
              if (config.tooltip_grouped && (!config.data_selection_enabled || config.data_selection_grouped)) {
                  return;
              }
  
              $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function () {
                  d3.select(this).classed(CLASS.EXPANDED, true);
                  if (config.data_selection_enabled) {
                      eventRect.style('cursor', config.data_selection_grouped ? 'pointer' : null);
                  }
                  if (!config.tooltip_grouped) {
                      $$.hideXGridFocus();
                      $$.hideTooltip();
                      if (!config.data_selection_grouped) {
                          $$.unexpandCircles(index);
                          $$.unexpandBars(index);
                      }
                  }
              }).filter(function (d) {
                  return $$.isWithinShape(this, d);
              }).each(function (d) {
                  if (config.data_selection_enabled && (config.data_selection_grouped || config.data_selection_isselectable(d))) {
                      eventRect.style('cursor', 'pointer');
                  }
                  if (!config.tooltip_grouped) {
                      $$.showTooltip([d], this);
                      $$.showXGridFocus([d]);
                      if (config.point_focus_expand_enabled) {
                          $$.expandCircles(index, d.id, true);
                      }
                      $$.expandBars(index, d.id, true);
                  }
              });
          }).on('click', function (d) {
              var index = d.index;
              if ($$.hasArcType() || !$$.toggleShape) {
                  return;
              }
              if ($$.cancelClick) {
                  $$.cancelClick = false;
                  return;
              }
              if ($$.isStepType(d) && config.line_step_type === 'step-after' && d3.mouse(this)[0] < $$.x($$.getXValue(d.id, index))) {
                  index -= 1;
              }
              $$.main.selectAll('.' + CLASS.shape + '-' + index).each(function (d) {
                  if (config.data_selection_grouped || $$.isWithinShape(this, d)) {
                      $$.toggleShape(this, d, index);
                      $$.config.data_onclick.call($$.api, d, this);
                  }
              });
          }).call(config.data_selection_draggable && $$.drag ? d3.behavior.drag().origin(Object).on('drag', function () {
              $$.drag(d3.mouse(this));
          }).on('dragstart', function () {
              $$.dragstart(d3.mouse(this));
          }).on('dragend', function () {
              $$.dragend();
          }) : function () {});
      };
  
      c3_chart_internal_fn.generateEventRectsForMultipleXs = function (eventRectEnter) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config;
  
          function mouseout() {
              $$.svg.select('.' + CLASS.eventRect).style('cursor', null);
              $$.hideXGridFocus();
              $$.hideTooltip();
              $$.unexpandCircles();
              $$.unexpandBars();
          }
  
          eventRectEnter.append('rect').attr('x', 0).attr('y', 0).attr('width', $$.width).attr('height', $$.height).attr('class', CLASS.eventRect).on('mouseout', function () {
              if (!$$.config) {
                  return;
              } // chart is destroyed
              if ($$.hasArcType()) {
                  return;
              }
              mouseout();
          }).on('mousemove', function () {
              var targetsToShow = $$.filterTargetsToShow($$.data.targets);
              var mouse, closest, sameXData, selectedData;
  
              if ($$.dragging) {
                  return;
              } // do nothing when dragging
              if ($$.hasArcType(targetsToShow)) {
                  return;
              }
  
              mouse = d3.mouse(this);
              closest = $$.findClosestFromTargets(targetsToShow, mouse);
  
              if ($$.mouseover && (!closest || closest.id !== $$.mouseover.id)) {
                  config.data_onmouseout.call($$.api, $$.mouseover);
                  $$.mouseover = undefined;
              }
  
              if (!closest) {
                  mouseout();
                  return;
              }
  
              if ($$.isScatterType(closest) || !config.tooltip_grouped) {
                  sameXData = [closest];
              } else {
                  sameXData = $$.filterByX(targetsToShow, closest.x);
              }
  
              // show tooltip when cursor is close to some point
              selectedData = sameXData.map(function (d) {
                  return $$.addName(d);
              });
              $$.showTooltip(selectedData, this);
  
              // expand points
              if (config.point_focus_expand_enabled) {
                  $$.expandCircles(closest.index, closest.id, true);
              }
              $$.expandBars(closest.index, closest.id, true);
  
              // Show xgrid focus line
              $$.showXGridFocus(selectedData);
  
              // Show cursor as pointer if point is close to mouse position
              if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < config.point_sensitivity) {
                  $$.svg.select('.' + CLASS.eventRect).style('cursor', 'pointer');
                  if (!$$.mouseover) {
                      config.data_onmouseover.call($$.api, closest);
                      $$.mouseover = closest;
                  }
              }
          }).on('click', function () {
              var targetsToShow = $$.filterTargetsToShow($$.data.targets);
              var mouse, closest;
              if ($$.hasArcType(targetsToShow)) {
                  return;
              }
  
              mouse = d3.mouse(this);
              closest = $$.findClosestFromTargets(targetsToShow, mouse);
              if (!closest) {
                  return;
              }
              // select if selection enabled
              if ($$.isBarType(closest.id) || $$.dist(closest, mouse) < config.point_sensitivity) {
                  $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(closest.id)).selectAll('.' + CLASS.shape + '-' + closest.index).each(function () {
                      if (config.data_selection_grouped || $$.isWithinShape(this, closest)) {
                          $$.toggleShape(this, closest, closest.index);
                          $$.config.data_onclick.call($$.api, closest, this);
                      }
                  });
              }
          }).call(config.data_selection_draggable && $$.drag ? d3.behavior.drag().origin(Object).on('drag', function () {
              $$.drag(d3.mouse(this));
          }).on('dragstart', function () {
              $$.dragstart(d3.mouse(this));
          }).on('dragend', function () {
              $$.dragend();
          }) : function () {});
      };
      c3_chart_internal_fn.dispatchEvent = function (type, index, mouse) {
          var $$ = this,
              selector = '.' + CLASS.eventRect + (!$$.isMultipleX() ? '-' + index : ''),
              eventRect = $$.main.select(selector).node(),
              box = eventRect.getBoundingClientRect(),
              x = box.left + (mouse ? mouse[0] : 0),
              y = box.top + (mouse ? mouse[1] : 0),
              event = document.createEvent("MouseEvents");
  
          event.initMouseEvent(type, true, true, window, 0, x, y, x, y, false, false, false, false, 0, null);
          eventRect.dispatchEvent(event);
      };
  
      c3_chart_internal_fn.initLegend = function () {
          var $$ = this;
          $$.legendItemTextBox = {};
          $$.legendHasRendered = false;
          $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));
          if (!$$.config.legend_show) {
              $$.legend.style('visibility', 'hidden');
              $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
              return;
          }
          // MEMO: call here to update legend box and tranlate for all
          // MEMO: translate will be upated by this, so transform not needed in updateLegend()
          $$.updateLegendWithDefaults();
      };
      c3_chart_internal_fn.updateLegendWithDefaults = function () {
          var $$ = this;
          $$.updateLegend($$.mapToIds($$.data.targets), { withTransform: false, withTransitionForTransform: false, withTransition: false });
      };
      c3_chart_internal_fn.updateSizeForLegend = function (legendHeight, legendWidth) {
          var $$ = this,
              config = $$.config,
              insetLegendPosition = {
              top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config.legend_inset_y + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config.legend_inset_y,
              left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config.legend_inset_x + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config.legend_inset_x + 0.5
          };
  
          $$.margin3 = {
              top: $$.isLegendRight ? 0 : $$.isLegendInset ? insetLegendPosition.top : $$.currentHeight - legendHeight,
              right: NaN,
              bottom: 0,
              left: $$.isLegendRight ? $$.currentWidth - legendWidth : $$.isLegendInset ? insetLegendPosition.left : 0
          };
      };
      c3_chart_internal_fn.transformLegend = function (withTransition) {
          var $$ = this;
          (withTransition ? $$.legend.transition() : $$.legend).attr("transform", $$.getTranslate('legend'));
      };
      c3_chart_internal_fn.updateLegendStep = function (step) {
          this.legendStep = step;
      };
      c3_chart_internal_fn.updateLegendItemWidth = function (w) {
          this.legendItemWidth = w;
      };
      c3_chart_internal_fn.updateLegendItemHeight = function (h) {
          this.legendItemHeight = h;
      };
      c3_chart_internal_fn.getLegendWidth = function () {
          var $$ = this;
          return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
      };
      c3_chart_internal_fn.getLegendHeight = function () {
          var $$ = this,
              h = 0;
          if ($$.config.legend_show) {
              if ($$.isLegendRight) {
                  h = $$.currentHeight;
              } else {
                  h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
              }
          }
          return h;
      };
      c3_chart_internal_fn.opacityForLegend = function (legendItem) {
          return legendItem.classed(CLASS.legendItemHidden) ? null : 1;
      };
      c3_chart_internal_fn.opacityForUnfocusedLegend = function (legendItem) {
          return legendItem.classed(CLASS.legendItemHidden) ? null : 0.3;
      };
      c3_chart_internal_fn.toggleFocusLegend = function (targetIds, focus) {
          var $$ = this;
          targetIds = $$.mapToTargetIds(targetIds);
          $$.legend.selectAll('.' + CLASS.legendItem).filter(function (id) {
              return targetIds.indexOf(id) >= 0;
          }).classed(CLASS.legendItemFocused, focus).transition().duration(100).style('opacity', function () {
              var opacity = focus ? $$.opacityForLegend : $$.opacityForUnfocusedLegend;
              return opacity.call($$, $$.d3.select(this));
          });
      };
      c3_chart_internal_fn.revertLegend = function () {
          var $$ = this,
              d3 = $$.d3;
          $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemFocused, false).transition().duration(100).style('opacity', function () {
              return $$.opacityForLegend(d3.select(this));
          });
      };
      c3_chart_internal_fn.showLegend = function (targetIds) {
          var $$ = this,
              config = $$.config;
          if (!config.legend_show) {
              config.legend_show = true;
              $$.legend.style('visibility', 'visible');
              if (!$$.legendHasRendered) {
                  $$.updateLegendWithDefaults();
              }
          }
          $$.removeHiddenLegendIds(targetIds);
          $$.legend.selectAll($$.selectorLegends(targetIds)).style('visibility', 'visible').transition().style('opacity', function () {
              return $$.opacityForLegend($$.d3.select(this));
          });
      };
      c3_chart_internal_fn.hideLegend = function (targetIds) {
          var $$ = this,
              config = $$.config;
          if (config.legend_show && isEmpty(targetIds)) {
              config.legend_show = false;
              $$.legend.style('visibility', 'hidden');
          }
          $$.addHiddenLegendIds(targetIds);
          $$.legend.selectAll($$.selectorLegends(targetIds)).style('opacity', 0).style('visibility', 'hidden');
      };
      c3_chart_internal_fn.clearLegendItemTextBoxCache = function () {
          this.legendItemTextBox = {};
      };
      c3_chart_internal_fn.updateLegend = function (targetIds, options, transitions) {
          var $$ = this,
              config = $$.config;
          var xForLegend, xForLegendText, xForLegendRect, yForLegend, yForLegendText, yForLegendRect, x1ForLegendTile, x2ForLegendTile, yForLegendTile;
          var paddingTop = 4,
              paddingRight = 10,
              maxWidth = 0,
              maxHeight = 0,
              posMin = 10,
              tileWidth = config.legend_item_tile_width + 5;
          var l,
              totalLength = 0,
              offsets = {},
              widths = {},
              heights = {},
              margins = [0],
              steps = {},
              step = 0;
          var withTransition, withTransitionForTransform;
          var texts, rects, tiles, background;
  
          // Skip elements when their name is set to null
          targetIds = targetIds.filter(function (id) {
              return !isDefined(config.data_names[id]) || config.data_names[id] !== null;
          });
  
          options = options || {};
          withTransition = getOption(options, "withTransition", true);
          withTransitionForTransform = getOption(options, "withTransitionForTransform", true);
  
          function getTextBox(textElement, id) {
              if (!$$.legendItemTextBox[id]) {
                  $$.legendItemTextBox[id] = $$.getTextRect(textElement.textContent, CLASS.legendItem, textElement);
              }
              return $$.legendItemTextBox[id];
          }
  
          function updatePositions(textElement, id, index) {
              var reset = index === 0,
                  isLast = index === targetIds.length - 1,
                  box = getTextBox(textElement, id),
                  itemWidth = box.width + tileWidth + (isLast && !($$.isLegendRight || $$.isLegendInset) ? 0 : paddingRight) + config.legend_padding,
                  itemHeight = box.height + paddingTop,
                  itemLength = $$.isLegendRight || $$.isLegendInset ? itemHeight : itemWidth,
                  areaLength = $$.isLegendRight || $$.isLegendInset ? $$.getLegendHeight() : $$.getLegendWidth(),
                  margin,
                  maxLength;
  
              // MEMO: care about condifion of step, totalLength
              function updateValues(id, withoutStep) {
                  if (!withoutStep) {
                      margin = (areaLength - totalLength - itemLength) / 2;
                      if (margin < posMin) {
                          margin = (areaLength - itemLength) / 2;
                          totalLength = 0;
                          step++;
                      }
                  }
                  steps[id] = step;
                  margins[step] = $$.isLegendInset ? 10 : margin;
                  offsets[id] = totalLength;
                  totalLength += itemLength;
              }
  
              if (reset) {
                  totalLength = 0;
                  step = 0;
                  maxWidth = 0;
                  maxHeight = 0;
              }
  
              if (config.legend_show && !$$.isLegendToShow(id)) {
                  widths[id] = heights[id] = steps[id] = offsets[id] = 0;
                  return;
              }
  
              widths[id] = itemWidth;
              heights[id] = itemHeight;
  
              if (!maxWidth || itemWidth >= maxWidth) {
                  maxWidth = itemWidth;
              }
              if (!maxHeight || itemHeight >= maxHeight) {
                  maxHeight = itemHeight;
              }
              maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;
  
              if (config.legend_equally) {
                  Object.keys(widths).forEach(function (id) {
                      widths[id] = maxWidth;
                  });
                  Object.keys(heights).forEach(function (id) {
                      heights[id] = maxHeight;
                  });
                  margin = (areaLength - maxLength * targetIds.length) / 2;
                  if (margin < posMin) {
                      totalLength = 0;
                      step = 0;
                      targetIds.forEach(function (id) {
                          updateValues(id);
                      });
                  } else {
                      updateValues(id, true);
                  }
              } else {
                  updateValues(id);
              }
          }
  
          if ($$.isLegendInset) {
              step = config.legend_inset_step ? config.legend_inset_step : targetIds.length;
              $$.updateLegendStep(step);
          }
  
          if ($$.isLegendRight) {
              xForLegend = function xForLegend(id) {
                  return maxWidth * steps[id];
              };
              yForLegend = function yForLegend(id) {
                  return margins[steps[id]] + offsets[id];
              };
          } else if ($$.isLegendInset) {
              xForLegend = function xForLegend(id) {
                  return maxWidth * steps[id] + 10;
              };
              yForLegend = function yForLegend(id) {
                  return margins[steps[id]] + offsets[id];
              };
          } else {
              xForLegend = function xForLegend(id) {
                  return margins[steps[id]] + offsets[id];
              };
              yForLegend = function yForLegend(id) {
                  return maxHeight * steps[id];
              };
          }
          xForLegendText = function xForLegendText(id, i) {
              return xForLegend(id, i) + 4 + config.legend_item_tile_width;
          };
          yForLegendText = function yForLegendText(id, i) {
              return yForLegend(id, i) + 9;
          };
          xForLegendRect = function xForLegendRect(id, i) {
              return xForLegend(id, i);
          };
          yForLegendRect = function yForLegendRect(id, i) {
              return yForLegend(id, i) - 5;
          };
          x1ForLegendTile = function x1ForLegendTile(id, i) {
              return xForLegend(id, i) - 2;
          };
          x2ForLegendTile = function x2ForLegendTile(id, i) {
              return xForLegend(id, i) - 2 + config.legend_item_tile_width;
          };
          yForLegendTile = function yForLegendTile(id, i) {
              return yForLegend(id, i) + 4;
          };
  
          // Define g for legend area
          l = $$.legend.selectAll('.' + CLASS.legendItem).data(targetIds).enter().append('g').attr('class', function (id) {
              return $$.generateClass(CLASS.legendItem, id);
          }).style('visibility', function (id) {
              return $$.isLegendToShow(id) ? 'visible' : 'hidden';
          }).style('cursor', 'pointer').on('click', function (id) {
              if (config.legend_item_onclick) {
                  config.legend_item_onclick.call($$, id);
              } else {
                  if ($$.d3.event.altKey) {
                      $$.api.hide();
                      $$.api.show(id);
                  } else {
                      $$.api.toggle(id);
                      $$.isTargetToShow(id) ? $$.api.focus(id) : $$.api.revert();
                  }
              }
          }).on('mouseover', function (id) {
              if (config.legend_item_onmouseover) {
                  config.legend_item_onmouseover.call($$, id);
              } else {
                  $$.d3.select(this).classed(CLASS.legendItemFocused, true);
                  if (!$$.transiting && $$.isTargetToShow(id)) {
                      $$.api.focus(id);
                  }
              }
          }).on('mouseout', function (id) {
              if (config.legend_item_onmouseout) {
                  config.legend_item_onmouseout.call($$, id);
              } else {
                  $$.d3.select(this).classed(CLASS.legendItemFocused, false);
                  $$.api.revert();
              }
          });
          l.append('text').text(function (id) {
              return isDefined(config.data_names[id]) ? config.data_names[id] : id;
          }).each(function (id, i) {
              updatePositions(this, id, i);
          }).style("pointer-events", "none").attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendText);
          l.append('rect').attr("class", CLASS.legendItemEvent).style('fill-opacity', 0).attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendRect : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendRect);
          l.append('line').attr('class', CLASS.legendItemTile).style('stroke', $$.color).style("pointer-events", "none").attr('x1', $$.isLegendRight || $$.isLegendInset ? x1ForLegendTile : -200).attr('y1', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('x2', $$.isLegendRight || $$.isLegendInset ? x2ForLegendTile : -200).attr('y2', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('stroke-width', config.legend_item_tile_height);
  
          // Set background for inset legend
          background = $$.legend.select('.' + CLASS.legendBackground + ' rect');
          if ($$.isLegendInset && maxWidth > 0 && background.size() === 0) {
              background = $$.legend.insert('g', '.' + CLASS.legendItem).attr("class", CLASS.legendBackground).append('rect');
          }
  
          texts = $$.legend.selectAll('text').data(targetIds).text(function (id) {
              return isDefined(config.data_names[id]) ? config.data_names[id] : id;
          }) // MEMO: needed for update
          .each(function (id, i) {
              updatePositions(this, id, i);
          });
          (withTransition ? texts.transition() : texts).attr('x', xForLegendText).attr('y', yForLegendText);
  
          rects = $$.legend.selectAll('rect.' + CLASS.legendItemEvent).data(targetIds);
          (withTransition ? rects.transition() : rects).attr('width', function (id) {
              return widths[id];
          }).attr('height', function (id) {
              return heights[id];
          }).attr('x', xForLegendRect).attr('y', yForLegendRect);
  
          tiles = $$.legend.selectAll('line.' + CLASS.legendItemTile).data(targetIds);
          (withTransition ? tiles.transition() : tiles).style('stroke', $$.levelColor ? function (id) {
              return $$.levelColor($$.cache[id].values[0].value);
          } : $$.color).attr('x1', x1ForLegendTile).attr('y1', yForLegendTile).attr('x2', x2ForLegendTile).attr('y2', yForLegendTile);
  
          if (background) {
              (withTransition ? background.transition() : background).attr('height', $$.getLegendHeight() - 12).attr('width', maxWidth * (step + 1) + 10);
          }
  
          // toggle legend state
          $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemHidden, function (id) {
              return !$$.isTargetToShow(id);
          });
  
          // Update all to reflect change of legend
          $$.updateLegendItemWidth(maxWidth);
          $$.updateLegendItemHeight(maxHeight);
          $$.updateLegendStep(step);
          // Update size and scale
          $$.updateSizes();
          $$.updateScales();
          $$.updateSvgSize();
          // Update g positions
          $$.transformAll(withTransitionForTransform, transitions);
          $$.legendHasRendered = true;
      };
  
      c3_chart_internal_fn.initRegion = function () {
          var $$ = this;
          $$.region = $$.main.append('g').attr("clip-path", $$.clipPath).attr("class", CLASS.regions);
      };
      c3_chart_internal_fn.updateRegion = function (duration) {
          var $$ = this,
              config = $$.config;
  
          // hide if arc type
          $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
  
          $$.mainRegion = $$.main.select('.' + CLASS.regions).selectAll('.' + CLASS.region).data(config.regions);
          $$.mainRegion.enter().append('g').append('rect').style("fill-opacity", 0);
          $$.mainRegion.attr('class', $$.classRegion.bind($$));
          $$.mainRegion.exit().transition().duration(duration).style("opacity", 0).remove();
      };
      c3_chart_internal_fn.redrawRegion = function (withTransition) {
          var $$ = this,
              regions = $$.mainRegion.selectAll('rect').each(function () {
              // data is binded to g and it's not transferred to rect (child node) automatically,
              // then data of each rect has to be updated manually.
              // TODO: there should be more efficient way to solve this?
              var parentData = $$.d3.select(this.parentNode).datum();
              $$.d3.select(this).datum(parentData);
          }),
              x = $$.regionX.bind($$),
              y = $$.regionY.bind($$),
              w = $$.regionWidth.bind($$),
              h = $$.regionHeight.bind($$);
          return [(withTransition ? regions.transition() : regions).attr("x", x).attr("y", y).attr("width", w).attr("height", h).style("fill-opacity", function (d) {
              return isValue(d.opacity) ? d.opacity : 0.1;
          })];
      };
      c3_chart_internal_fn.regionX = function (d) {
          var $$ = this,
              config = $$.config,
              xPos,
              yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              xPos = config.axis_rotated ? 'start' in d ? yScale(d.start) : 0 : 0;
          } else {
              xPos = config.axis_rotated ? 0 : 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0;
          }
          return xPos;
      };
      c3_chart_internal_fn.regionY = function (d) {
          var $$ = this,
              config = $$.config,
              yPos,
              yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              yPos = config.axis_rotated ? 0 : 'end' in d ? yScale(d.end) : 0;
          } else {
              yPos = config.axis_rotated ? 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0 : 0;
          }
          return yPos;
      };
      c3_chart_internal_fn.regionWidth = function (d) {
          var $$ = this,
              config = $$.config,
              start = $$.regionX(d),
              end,
              yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              end = config.axis_rotated ? 'end' in d ? yScale(d.end) : $$.width : $$.width;
          } else {
              end = config.axis_rotated ? $$.width : 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width;
          }
          return end < start ? 0 : end - start;
      };
      c3_chart_internal_fn.regionHeight = function (d) {
          var $$ = this,
              config = $$.config,
              start = this.regionY(d),
              end,
              yScale = d.axis === 'y' ? $$.y : $$.y2;
          if (d.axis === 'y' || d.axis === 'y2') {
              end = config.axis_rotated ? $$.height : 'start' in d ? yScale(d.start) : $$.height;
          } else {
              end = config.axis_rotated ? 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height : $$.height;
          }
          return end < start ? 0 : end - start;
      };
      c3_chart_internal_fn.isRegionOnX = function (d) {
          return !d.axis || d.axis === 'x';
      };
  
      c3_chart_internal_fn.getScale = function (min, max, forTimeseries) {
          return (forTimeseries ? this.d3.time.scale() : this.d3.scale.linear()).range([min, max]);
      };
      c3_chart_internal_fn.getX = function (min, max, domain, offset) {
          var $$ = this,
              scale = $$.getScale(min, max, $$.isTimeSeries()),
              _scale = domain ? scale.domain(domain) : scale,
              key;
          // Define customized scale if categorized axis
          if ($$.isCategorized()) {
              offset = offset || function () {
                  return 0;
              };
              scale = function scale(d, raw) {
                  var v = _scale(d) + offset(d);
                  return raw ? v : Math.ceil(v);
              };
          } else {
              scale = function scale(d, raw) {
                  var v = _scale(d);
                  return raw ? v : Math.ceil(v);
              };
          }
          // define functions
          for (key in _scale) {
              scale[key] = _scale[key];
          }
          scale.orgDomain = function () {
              return _scale.domain();
          };
          // define custom domain() for categorized axis
          if ($$.isCategorized()) {
              scale.domain = function (domain) {
                  if (!arguments.length) {
                      domain = this.orgDomain();
                      return [domain[0], domain[1] + 1];
                  }
                  _scale.domain(domain);
                  return scale;
              };
          }
          return scale;
      };
      c3_chart_internal_fn.getY = function (min, max, domain) {
          var scale = this.getScale(min, max, this.isTimeSeriesY());
          if (domain) {
              scale.domain(domain);
          }
          return scale;
      };
      c3_chart_internal_fn.getYScale = function (id) {
          return this.axis.getId(id) === 'y2' ? this.y2 : this.y;
      };
      c3_chart_internal_fn.getSubYScale = function (id) {
          return this.axis.getId(id) === 'y2' ? this.subY2 : this.subY;
      };
      c3_chart_internal_fn.updateScales = function () {
          var $$ = this,
              config = $$.config,
              forInit = !$$.x;
          // update edges
          $$.xMin = config.axis_rotated ? 1 : 0;
          $$.xMax = config.axis_rotated ? $$.height : $$.width;
          $$.yMin = config.axis_rotated ? 0 : $$.height;
          $$.yMax = config.axis_rotated ? $$.width : 1;
          $$.subXMin = $$.xMin;
          $$.subXMax = $$.xMax;
          $$.subYMin = config.axis_rotated ? 0 : $$.height2;
          $$.subYMax = config.axis_rotated ? $$.width2 : 1;
          // update scales
          $$.x = $$.getX($$.xMin, $$.xMax, forInit ? undefined : $$.x.orgDomain(), function () {
              return $$.xAxis.tickOffset();
          });
          $$.y = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y_default : $$.y.domain());
          $$.y2 = $$.getY($$.yMin, $$.yMax, forInit ? config.axis_y2_default : $$.y2.domain());
          $$.subX = $$.getX($$.xMin, $$.xMax, $$.orgXDomain, function (d) {
              return d % 1 ? 0 : $$.subXAxis.tickOffset();
          });
          $$.subY = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y_default : $$.subY.domain());
          $$.subY2 = $$.getY($$.subYMin, $$.subYMax, forInit ? config.axis_y2_default : $$.subY2.domain());
          // update axes
          $$.xAxisTickFormat = $$.axis.getXAxisTickFormat();
          $$.xAxisTickValues = $$.axis.getXAxisTickValues();
          $$.yAxisTickValues = $$.axis.getYAxisTickValues();
          $$.y2AxisTickValues = $$.axis.getY2AxisTickValues();
  
          $$.xAxis = $$.axis.getXAxis($$.x, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
          $$.subXAxis = $$.axis.getXAxis($$.subX, $$.subXOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
          $$.yAxis = $$.axis.getYAxis($$.y, $$.yOrient, config.axis_y_tick_format, $$.yAxisTickValues, config.axis_y_tick_outer);
          $$.y2Axis = $$.axis.getYAxis($$.y2, $$.y2Orient, config.axis_y2_tick_format, $$.y2AxisTickValues, config.axis_y2_tick_outer);
  
          // Set initialized scales to brush and zoom
          if (!forInit) {
              if ($$.brush) {
                  $$.brush.scale($$.subX);
              }
              if (config.zoom_enabled) {
                  $$.zoom.scale($$.x);
              }
          }
          // update for arc
          if ($$.updateArc) {
              $$.updateArc();
          }
      };
  
      c3_chart_internal_fn.selectPoint = function (target, d, i) {
          var $$ = this,
              config = $$.config,
              cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
              cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
              r = $$.pointSelectR.bind($$);
          config.data_onselected.call($$.api, d, target.node());
          // add selected-circle on low layer g
          $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).data([d]).enter().append('circle').attr("class", function () {
              return $$.generateClass(CLASS.selectedCircle, i);
          }).attr("cx", cx).attr("cy", cy).attr("stroke", function () {
              return $$.color(d);
          }).attr("r", function (d) {
              return $$.pointSelectR(d) * 1.4;
          }).transition().duration(100).attr("r", r);
      };
      c3_chart_internal_fn.unselectPoint = function (target, d, i) {
          var $$ = this;
          $$.config.data_onunselected.call($$.api, d, target.node());
          // remove selected-circle from low layer g
          $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).transition().duration(100).attr('r', 0).remove();
      };
      c3_chart_internal_fn.togglePoint = function (selected, target, d, i) {
          selected ? this.selectPoint(target, d, i) : this.unselectPoint(target, d, i);
      };
      c3_chart_internal_fn.selectPath = function (target, d) {
          var $$ = this;
          $$.config.data_onselected.call($$, d, target.node());
          if ($$.config.interaction_brighten) {
              target.transition().duration(100).style("fill", function () {
                  return $$.d3.rgb($$.color(d)).brighter(0.75);
              });
          }
      };
      c3_chart_internal_fn.unselectPath = function (target, d) {
          var $$ = this;
          $$.config.data_onunselected.call($$, d, target.node());
          if ($$.config.interaction_brighten) {
              target.transition().duration(100).style("fill", function () {
                  return $$.color(d);
              });
          }
      };
      c3_chart_internal_fn.togglePath = function (selected, target, d, i) {
          selected ? this.selectPath(target, d, i) : this.unselectPath(target, d, i);
      };
      c3_chart_internal_fn.getToggle = function (that, d) {
          var $$ = this,
              toggle;
          if (that.nodeName === 'circle') {
              if ($$.isStepType(d)) {
                  // circle is hidden in step chart, so treat as within the click area
                  toggle = function toggle() {}; // TODO: how to select step chart?
              } else {
                  toggle = $$.togglePoint;
              }
          } else if (that.nodeName === 'path') {
              toggle = $$.togglePath;
          }
          return toggle;
      };
      c3_chart_internal_fn.toggleShape = function (that, d, i) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config,
              shape = d3.select(that),
              isSelected = shape.classed(CLASS.SELECTED),
              toggle = $$.getToggle(that, d).bind($$);
  
          if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
              if (!config.data_selection_multiple) {
                  $$.main.selectAll('.' + CLASS.shapes + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS.shape).each(function (d, i) {
                      var shape = d3.select(this);
                      if (shape.classed(CLASS.SELECTED)) {
                          toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
                      }
                  });
              }
              shape.classed(CLASS.SELECTED, !isSelected);
              toggle(!isSelected, shape, d, i);
          }
      };
  
      c3_chart_internal_fn.initBar = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars);
      };
      c3_chart_internal_fn.updateTargetsForBar = function (targets) {
          var $$ = this,
              config = $$.config,
              mainBarUpdate,
              mainBarEnter,
              classChartBar = $$.classChartBar.bind($$),
              classBars = $$.classBars.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainBarUpdate = $$.main.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets).attr('class', function (d) {
              return classChartBar(d) + classFocus(d);
          });
          mainBarEnter = mainBarUpdate.enter().append('g').attr('class', classChartBar).style("pointer-events", "none");
          // Bars for each data
          mainBarEnter.append('g').attr("class", classBars).style("cursor", function (d) {
              return config.data_selection_isselectable(d) ? "pointer" : null;
          });
      };
      c3_chart_internal_fn.updateBar = function (durationForExit) {
          var $$ = this,
              barData = $$.barData.bind($$),
              classBar = $$.classBar.bind($$),
              initialOpacity = $$.initialOpacity.bind($$),
              color = function color(d) {
              return $$.color(d.id);
          };
          $$.mainBar = $$.main.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data(barData);
          $$.mainBar.enter().append('path').attr("class", classBar).style("stroke", color).style("fill", color);
          $$.mainBar.style("opacity", initialOpacity);
          $$.mainBar.exit().transition().duration(durationForExit).remove();
      };
      c3_chart_internal_fn.redrawBar = function (drawBar, withTransition) {
          return [(withTransition ? this.mainBar.transition(Math.random().toString()) : this.mainBar).attr('d', drawBar).style("stroke", this.color).style("fill", this.color).style("opacity", 1)];
      };
      c3_chart_internal_fn.getBarW = function (axis, barTargetsNum) {
          var $$ = this,
              config = $$.config,
              w = typeof config.bar_width === 'number' ? config.bar_width : barTargetsNum ? axis.tickInterval() * config.bar_width_ratio / barTargetsNum : 0;
          return config.bar_width_max && w > config.bar_width_max ? config.bar_width_max : w;
      };
      c3_chart_internal_fn.getBars = function (i, id) {
          var $$ = this;
          return (id ? $$.main.selectAll('.' + CLASS.bars + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.bar + (isValue(i) ? '-' + i : ''));
      };
      c3_chart_internal_fn.expandBars = function (i, id, reset) {
          var $$ = this;
          if (reset) {
              $$.unexpandBars();
          }
          $$.getBars(i, id).classed(CLASS.EXPANDED, true);
      };
      c3_chart_internal_fn.unexpandBars = function (i) {
          var $$ = this;
          $$.getBars(i).classed(CLASS.EXPANDED, false);
      };
      c3_chart_internal_fn.generateDrawBar = function (barIndices, isSub) {
          var $$ = this,
              config = $$.config,
              getPoints = $$.generateGetBarPoints(barIndices, isSub);
          return function (d, i) {
              // 4 points that make a bar
              var points = getPoints(d, i);
  
              // switch points if axis is rotated, not applicable for sub chart
              var indexX = config.axis_rotated ? 1 : 0;
              var indexY = config.axis_rotated ? 0 : 1;
  
              var path = 'M ' + points[0][indexX] + ',' + points[0][indexY] + ' ' + 'L' + points[1][indexX] + ',' + points[1][indexY] + ' ' + 'L' + points[2][indexX] + ',' + points[2][indexY] + ' ' + 'L' + points[3][indexX] + ',' + points[3][indexY] + ' ' + 'z';
  
              return path;
          };
      };
      c3_chart_internal_fn.generateGetBarPoints = function (barIndices, isSub) {
          var $$ = this,
              axis = isSub ? $$.subXAxis : $$.xAxis,
              barTargetsNum = barIndices.__max__ + 1,
              barW = $$.getBarW(axis, barTargetsNum),
              barX = $$.getShapeX(barW, barTargetsNum, barIndices, !!isSub),
              barY = $$.getShapeY(!!isSub),
              barOffset = $$.getShapeOffset($$.isBarType, barIndices, !!isSub),
              barSpaceOffset = barW * ($$.config.bar_space / 2),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = barOffset(d, i) || y0,
                  // offset is for stacked bar chart
              posX = barX(d),
                  posY = barY(d);
              // fix posY not to overflow opposite quadrant
              if ($$.config.axis_rotated) {
                  if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                      posY = y0;
                  }
              }
              // 4 points that make a bar
              return [[posX + barSpaceOffset, offset], [posX + barSpaceOffset, posY - (y0 - offset)], [posX + barW - barSpaceOffset, posY - (y0 - offset)], [posX + barW - barSpaceOffset, offset]];
          };
      };
      c3_chart_internal_fn.isWithinBar = function (that) {
          var mouse = this.d3.mouse(that),
              box = that.getBoundingClientRect(),
              seg0 = that.pathSegList.getItem(0),
              seg1 = that.pathSegList.getItem(1),
              x = Math.min(seg0.x, seg1.x),
              y = Math.min(seg0.y, seg1.y),
              w = box.width,
              h = box.height,
              offset = 2,
              sx = x - offset,
              ex = x + w + offset,
              sy = y + h + offset,
              ey = y - offset;
          return sx < mouse[0] && mouse[0] < ex && ey < mouse[1] && mouse[1] < sy;
      };
  
      c3_chart_internal_fn.getShapeIndices = function (typeFilter) {
          var $$ = this,
              config = $$.config,
              indices = {},
              i = 0,
              j,
              k;
          $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
              for (j = 0; j < config.data_groups.length; j++) {
                  if (config.data_groups[j].indexOf(d.id) < 0) {
                      continue;
                  }
                  for (k = 0; k < config.data_groups[j].length; k++) {
                      if (config.data_groups[j][k] in indices) {
                          indices[d.id] = indices[config.data_groups[j][k]];
                          break;
                      }
                  }
              }
              if (isUndefined(indices[d.id])) {
                  indices[d.id] = i++;
              }
          });
          indices.__max__ = i - 1;
          return indices;
      };
      c3_chart_internal_fn.getShapeX = function (offset, targetsNum, indices, isSub) {
          var $$ = this,
              scale = isSub ? $$.subX : $$.x;
          return function (d) {
              var index = d.id in indices ? indices[d.id] : 0;
              return d.x || d.x === 0 ? scale(d.x) - offset * (targetsNum / 2 - index) : 0;
          };
      };
      c3_chart_internal_fn.getShapeY = function (isSub) {
          var $$ = this;
          return function (d) {
              var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id);
              return scale(d.value);
          };
      };
      c3_chart_internal_fn.getShapeOffset = function (typeFilter, indices, isSub) {
          var $$ = this,
              targets = $$.orderTargets($$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$))),
              targetIds = targets.map(function (t) {
              return t.id;
          });
          return function (d, i) {
              var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id),
                  y0 = scale(0),
                  offset = y0;
              targets.forEach(function (t) {
                  var values = $$.isStepType(d) ? $$.convertValuesToStep(t.values) : t.values;
                  if (t.id === d.id || indices[t.id] !== indices[d.id]) {
                      return;
                  }
                  if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id)) {
                      // check if the x values line up
                      if (typeof values[i] === 'undefined' || +values[i].x !== +d.x) {
                          // "+" for timeseries
                          // if not, try to find the value that does line up
                          i = -1;
                          values.forEach(function (v, j) {
                              if (v.x === d.x) {
                                  i = j;
                              }
                          });
                      }
                      if (i in values && values[i].value * d.value >= 0) {
                          offset += scale(values[i].value) - y0;
                      }
                  }
              });
              return offset;
          };
      };
      c3_chart_internal_fn.isWithinShape = function (that, d) {
          var $$ = this,
              shape = $$.d3.select(that),
              isWithin;
          if (!$$.isTargetToShow(d.id)) {
              isWithin = false;
          } else if (that.nodeName === 'circle') {
              isWithin = $$.isStepType(d) ? $$.isWithinStep(that, $$.getYScale(d.id)(d.value)) : $$.isWithinCircle(that, $$.pointSelectR(d) * 1.5);
          } else if (that.nodeName === 'path') {
              isWithin = shape.classed(CLASS.bar) ? $$.isWithinBar(that) : true;
          }
          return isWithin;
      };
  
      c3_chart_internal_fn.getInterpolate = function (d) {
          var $$ = this,
              interpolation = $$.isInterpolationType($$.config.spline_interpolation_type) ? $$.config.spline_interpolation_type : 'cardinal';
          return $$.isSplineType(d) ? interpolation : $$.isStepType(d) ? $$.config.line_step_type : "linear";
      };
  
      c3_chart_internal_fn.initLine = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines);
      };
      c3_chart_internal_fn.updateTargetsForLine = function (targets) {
          var $$ = this,
              config = $$.config,
              mainLineUpdate,
              mainLineEnter,
              classChartLine = $$.classChartLine.bind($$),
              classLines = $$.classLines.bind($$),
              classAreas = $$.classAreas.bind($$),
              classCircles = $$.classCircles.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainLineUpdate = $$.main.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets).attr('class', function (d) {
              return classChartLine(d) + classFocus(d);
          });
          mainLineEnter = mainLineUpdate.enter().append('g').attr('class', classChartLine).style('opacity', 0).style("pointer-events", "none");
          // Lines for each data
          mainLineEnter.append('g').attr("class", classLines);
          // Areas
          mainLineEnter.append('g').attr('class', classAreas);
          // Circles for each data point on lines
          mainLineEnter.append('g').attr("class", function (d) {
              return $$.generateClass(CLASS.selectedCircles, d.id);
          });
          mainLineEnter.append('g').attr("class", classCircles).style("cursor", function (d) {
              return config.data_selection_isselectable(d) ? "pointer" : null;
          });
          // Update date for selected circles
          targets.forEach(function (t) {
              $$.main.selectAll('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(t.id)).selectAll('.' + CLASS.selectedCircle).each(function (d) {
                  d.value = t.values[d.index].value;
              });
          });
          // MEMO: can not keep same color...
          //mainLineUpdate.exit().remove();
      };
      c3_chart_internal_fn.updateLine = function (durationForExit) {
          var $$ = this;
          $$.mainLine = $$.main.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
          $$.mainLine.enter().append('path').attr('class', $$.classLine.bind($$)).style("stroke", $$.color);
          $$.mainLine.style("opacity", $$.initialOpacity.bind($$)).style('shape-rendering', function (d) {
              return $$.isStepType(d) ? 'crispEdges' : '';
          }).attr('transform', null);
          $$.mainLine.exit().transition().duration(durationForExit).style('opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawLine = function (drawLine, withTransition) {
          return [(withTransition ? this.mainLine.transition(Math.random().toString()) : this.mainLine).attr("d", drawLine).style("stroke", this.color).style("opacity", 1)];
      };
      c3_chart_internal_fn.generateDrawLine = function (lineIndices, isSub) {
          var $$ = this,
              config = $$.config,
              line = $$.d3.svg.line(),
              getPoints = $$.generateGetLinePoints(lineIndices, isSub),
              yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
              xValue = function xValue(d) {
              return (isSub ? $$.subxx : $$.xx).call($$, d);
          },
              yValue = function yValue(d, i) {
              return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)(d.value);
          };
  
          line = config.axis_rotated ? line.x(yValue).y(xValue) : line.x(xValue).y(yValue);
          if (!config.line_connectNull) {
              line = line.defined(function (d) {
                  return d.value != null;
              });
          }
          return function (d) {
              var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                  x = isSub ? $$.x : $$.subX,
                  y = yScaleGetter.call($$, d.id),
                  x0 = 0,
                  y0 = 0,
                  path;
              if ($$.isLineType(d)) {
                  if (config.data_regions[d.id]) {
                      path = $$.lineWithRegions(values, x, y, config.data_regions[d.id]);
                  } else {
                      if ($$.isStepType(d)) {
                          values = $$.convertValuesToStep(values);
                      }
                      path = line.interpolate($$.getInterpolate(d))(values);
                  }
              } else {
                  if (values[0]) {
                      x0 = x(values[0].x);
                      y0 = y(values[0].value);
                  }
                  path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
              }
              return path ? path : "M 0 0";
          };
      };
      c3_chart_internal_fn.generateGetLinePoints = function (lineIndices, isSub) {
          // partial duplication of generateGetBarPoints
          var $$ = this,
              config = $$.config,
              lineTargetsNum = lineIndices.__max__ + 1,
              x = $$.getShapeX(0, lineTargetsNum, lineIndices, !!isSub),
              y = $$.getShapeY(!!isSub),
              lineOffset = $$.getShapeOffset($$.isLineType, lineIndices, !!isSub),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = lineOffset(d, i) || y0,
                  // offset is for stacked area chart
              posX = x(d),
                  posY = y(d);
              // fix posY not to overflow opposite quadrant
              if (config.axis_rotated) {
                  if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                      posY = y0;
                  }
              }
              // 1 point that marks the line position
              return [[posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
              [posX, posY - (y0 - offset)], // needed for compatibility
              [posX, posY - (y0 - offset)] // needed for compatibility
              ];
          };
      };
  
      c3_chart_internal_fn.lineWithRegions = function (d, x, y, _regions) {
          var $$ = this,
              config = $$.config,
              prev = -1,
              i,
              j,
              s = "M",
              sWithRegion,
              xp,
              yp,
              dx,
              dy,
              dd,
              diff,
              diffx2,
              xOffset = $$.isCategorized() ? 0.5 : 0,
              xValue,
              yValue,
              regions = [];
  
          function isWithinRegions(x, regions) {
              var i;
              for (i = 0; i < regions.length; i++) {
                  if (regions[i].start < x && x <= regions[i].end) {
                      return true;
                  }
              }
              return false;
          }
  
          // Check start/end of regions
          if (isDefined(_regions)) {
              for (i = 0; i < _regions.length; i++) {
                  regions[i] = {};
                  if (isUndefined(_regions[i].start)) {
                      regions[i].start = d[0].x;
                  } else {
                      regions[i].start = $$.isTimeSeries() ? $$.parseDate(_regions[i].start) : _regions[i].start;
                  }
                  if (isUndefined(_regions[i].end)) {
                      regions[i].end = d[d.length - 1].x;
                  } else {
                      regions[i].end = $$.isTimeSeries() ? $$.parseDate(_regions[i].end) : _regions[i].end;
                  }
              }
          }
  
          // Set scales
          xValue = config.axis_rotated ? function (d) {
              return y(d.value);
          } : function (d) {
              return x(d.x);
          };
          yValue = config.axis_rotated ? function (d) {
              return x(d.x);
          } : function (d) {
              return y(d.value);
          };
  
          // Define svg generator function for region
          function generateM(points) {
              return 'M' + points[0][0] + ' ' + points[0][1] + ' ' + points[1][0] + ' ' + points[1][1];
          }
          if ($$.isTimeSeries()) {
              sWithRegion = function sWithRegion(d0, d1, j, diff) {
                  var x0 = d0.x.getTime(),
                      x_diff = d1.x - d0.x,
                      xv0 = new Date(x0 + x_diff * j),
                      xv1 = new Date(x0 + x_diff * (j + diff)),
                      points;
                  if (config.axis_rotated) {
                      points = [[y(yp(j)), x(xv0)], [y(yp(j + diff)), x(xv1)]];
                  } else {
                      points = [[x(xv0), y(yp(j))], [x(xv1), y(yp(j + diff))]];
                  }
                  return generateM(points);
              };
          } else {
              sWithRegion = function sWithRegion(d0, d1, j, diff) {
                  var points;
                  if (config.axis_rotated) {
                      points = [[y(yp(j), true), x(xp(j))], [y(yp(j + diff), true), x(xp(j + diff))]];
                  } else {
                      points = [[x(xp(j), true), y(yp(j))], [x(xp(j + diff), true), y(yp(j + diff))]];
                  }
                  return generateM(points);
              };
          }
  
          // Generate
          for (i = 0; i < d.length; i++) {
  
              // Draw as normal
              if (isUndefined(regions) || !isWithinRegions(d[i].x, regions)) {
                  s += " " + xValue(d[i]) + " " + yValue(d[i]);
              }
              // Draw with region // TODO: Fix for horizotal charts
              else {
                      xp = $$.getScale(d[i - 1].x + xOffset, d[i].x + xOffset, $$.isTimeSeries());
                      yp = $$.getScale(d[i - 1].value, d[i].value);
  
                      dx = x(d[i].x) - x(d[i - 1].x);
                      dy = y(d[i].value) - y(d[i - 1].value);
                      dd = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
                      diff = 2 / dd;
                      diffx2 = diff * 2;
  
                      for (j = diff; j <= 1; j += diffx2) {
                          s += sWithRegion(d[i - 1], d[i], j, diff);
                      }
                  }
              prev = d[i].x;
          }
  
          return s;
      };
  
      c3_chart_internal_fn.updateArea = function (durationForExit) {
          var $$ = this,
              d3 = $$.d3;
          $$.mainArea = $$.main.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
          $$.mainArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
              $$.orgAreaOpacity = +d3.select(this).style('opacity');return 0;
          });
          $$.mainArea.style("opacity", $$.orgAreaOpacity);
          $$.mainArea.exit().transition().duration(durationForExit).style('opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawArea = function (drawArea, withTransition) {
          return [(withTransition ? this.mainArea.transition(Math.random().toString()) : this.mainArea).attr("d", drawArea).style("fill", this.color).style("opacity", this.orgAreaOpacity)];
      };
      c3_chart_internal_fn.generateDrawArea = function (areaIndices, isSub) {
          var $$ = this,
              config = $$.config,
              area = $$.d3.svg.area(),
              getPoints = $$.generateGetAreaPoints(areaIndices, isSub),
              yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
              xValue = function xValue(d) {
              return (isSub ? $$.subxx : $$.xx).call($$, d);
          },
              value0 = function value0(d, i) {
              return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)($$.getAreaBaseValue(d.id));
          },
              value1 = function value1(d, i) {
              return config.data_groups.length > 0 ? getPoints(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
          };
  
          area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(config.area_above ? 0 : value0).y1(value1);
          if (!config.line_connectNull) {
              area = area.defined(function (d) {
                  return d.value !== null;
              });
          }
  
          return function (d) {
              var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
                  x0 = 0,
                  y0 = 0,
                  path;
              if ($$.isAreaType(d)) {
                  if ($$.isStepType(d)) {
                      values = $$.convertValuesToStep(values);
                  }
                  path = area.interpolate($$.getInterpolate(d))(values);
              } else {
                  if (values[0]) {
                      x0 = $$.x(values[0].x);
                      y0 = $$.getYScale(d.id)(values[0].value);
                  }
                  path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
              }
              return path ? path : "M 0 0";
          };
      };
      c3_chart_internal_fn.getAreaBaseValue = function () {
          return 0;
      };
      c3_chart_internal_fn.generateGetAreaPoints = function (areaIndices, isSub) {
          // partial duplication of generateGetBarPoints
          var $$ = this,
              config = $$.config,
              areaTargetsNum = areaIndices.__max__ + 1,
              x = $$.getShapeX(0, areaTargetsNum, areaIndices, !!isSub),
              y = $$.getShapeY(!!isSub),
              areaOffset = $$.getShapeOffset($$.isAreaType, areaIndices, !!isSub),
              yScale = isSub ? $$.getSubYScale : $$.getYScale;
          return function (d, i) {
              var y0 = yScale.call($$, d.id)(0),
                  offset = areaOffset(d, i) || y0,
                  // offset is for stacked area chart
              posX = x(d),
                  posY = y(d);
              // fix posY not to overflow opposite quadrant
              if (config.axis_rotated) {
                  if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
                      posY = y0;
                  }
              }
              // 1 point that marks the area position
              return [[posX, offset], [posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
              [posX, offset] // needed for compatibility
              ];
          };
      };
  
      c3_chart_internal_fn.updateCircle = function () {
          var $$ = this;
          $$.mainCircle = $$.main.selectAll('.' + CLASS.circles).selectAll('.' + CLASS.circle).data($$.lineOrScatterData.bind($$));
          $$.mainCircle.enter().append("circle").attr("class", $$.classCircle.bind($$)).attr("r", $$.pointR.bind($$)).style("fill", $$.color);
          $$.mainCircle.style("opacity", $$.initialOpacityForCircle.bind($$));
          $$.mainCircle.exit().remove();
      };
      c3_chart_internal_fn.redrawCircle = function (cx, cy, withTransition) {
          var selectedCircles = this.main.selectAll('.' + CLASS.selectedCircle);
          return [(withTransition ? this.mainCircle.transition(Math.random().toString()) : this.mainCircle).style('opacity', this.opacityForCircle.bind(this)).style("fill", this.color).attr("cx", cx).attr("cy", cy), (withTransition ? selectedCircles.transition(Math.random().toString()) : selectedCircles).attr("cx", cx).attr("cy", cy)];
      };
      c3_chart_internal_fn.circleX = function (d) {
          return d.x || d.x === 0 ? this.x(d.x) : null;
      };
      c3_chart_internal_fn.updateCircleY = function () {
          var $$ = this,
              lineIndices,
              getPoints;
          if ($$.config.data_groups.length > 0) {
              lineIndices = $$.getShapeIndices($$.isLineType), getPoints = $$.generateGetLinePoints(lineIndices);
              $$.circleY = function (d, i) {
                  return getPoints(d, i)[0][1];
              };
          } else {
              $$.circleY = function (d) {
                  return $$.getYScale(d.id)(d.value);
              };
          }
      };
      c3_chart_internal_fn.getCircles = function (i, id) {
          var $$ = this;
          return (id ? $$.main.selectAll('.' + CLASS.circles + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.circle + (isValue(i) ? '-' + i : ''));
      };
      c3_chart_internal_fn.expandCircles = function (i, id, reset) {
          var $$ = this,
              r = $$.pointExpandedR.bind($$);
          if (reset) {
              $$.unexpandCircles();
          }
          $$.getCircles(i, id).classed(CLASS.EXPANDED, true).attr('r', r);
      };
      c3_chart_internal_fn.unexpandCircles = function (i) {
          var $$ = this,
              r = $$.pointR.bind($$);
          $$.getCircles(i).filter(function () {
              return $$.d3.select(this).classed(CLASS.EXPANDED);
          }).classed(CLASS.EXPANDED, false).attr('r', r);
      };
      c3_chart_internal_fn.pointR = function (d) {
          var $$ = this,
              config = $$.config;
          return $$.isStepType(d) ? 0 : isFunction(config.point_r) ? config.point_r(d) : config.point_r;
      };
      c3_chart_internal_fn.pointExpandedR = function (d) {
          var $$ = this,
              config = $$.config;
          if (config.point_focus_expand_enabled) {
              return isFunction(config.point_focus_expand_r) ? config.point_focus_expand_r(d) : config.point_focus_expand_r ? config.point_focus_expand_r : $$.pointR(d) * 1.75;
          } else {
              return $$.pointR(d);
          }
      };
      c3_chart_internal_fn.pointSelectR = function (d) {
          var $$ = this,
              config = $$.config;
          return isFunction(config.point_select_r) ? config.point_select_r(d) : config.point_select_r ? config.point_select_r : $$.pointR(d) * 4;
      };
      c3_chart_internal_fn.isWithinCircle = function (that, r) {
          var d3 = this.d3,
              mouse = d3.mouse(that),
              d3_this = d3.select(that),
              cx = +d3_this.attr("cx"),
              cy = +d3_this.attr("cy");
          return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < r;
      };
      c3_chart_internal_fn.isWithinStep = function (that, y) {
          return Math.abs(y - this.d3.mouse(that)[1]) < 30;
      };
  
      c3_chart_internal_fn.getCurrentWidth = function () {
          var $$ = this,
              config = $$.config;
          return config.size_width ? config.size_width : $$.getParentWidth();
      };
      c3_chart_internal_fn.getCurrentHeight = function () {
          var $$ = this,
              config = $$.config,
              h = config.size_height ? config.size_height : $$.getParentHeight();
          return h > 0 ? h : 320 / ($$.hasType('gauge') && !config.gauge_fullCircle ? 2 : 1);
      };
      c3_chart_internal_fn.getCurrentPaddingTop = function () {
          var $$ = this,
              config = $$.config,
              padding = isValue(config.padding_top) ? config.padding_top : 0;
          if ($$.title && $$.title.node()) {
              padding += $$.getTitlePadding();
          }
          return padding;
      };
      c3_chart_internal_fn.getCurrentPaddingBottom = function () {
          var config = this.config;
          return isValue(config.padding_bottom) ? config.padding_bottom : 0;
      };
      c3_chart_internal_fn.getCurrentPaddingLeft = function (withoutRecompute) {
          var $$ = this,
              config = $$.config;
          if (isValue(config.padding_left)) {
              return config.padding_left;
          } else if (config.axis_rotated) {
              return !config.axis_x_show || config.axis_x_inner ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x', withoutRecompute)), 40);
          } else if (!config.axis_y_show || config.axis_y_inner) {
              // && !config.axis_rotated
              return $$.axis.getYAxisLabelPosition().isOuter ? 30 : 1;
          } else {
              return ceil10($$.getAxisWidthByAxisId('y', withoutRecompute));
          }
      };
      c3_chart_internal_fn.getCurrentPaddingRight = function () {
          var $$ = this,
              config = $$.config,
              defaultPadding = 10,
              legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;
          if (isValue(config.padding_right)) {
              return config.padding_right + 1; // 1 is needed not to hide tick line
          } else if (config.axis_rotated) {
              return defaultPadding + legendWidthOnRight;
          } else if (!config.axis_y2_show || config.axis_y2_inner) {
              // && !config.axis_rotated
              return 2 + legendWidthOnRight + ($$.axis.getY2AxisLabelPosition().isOuter ? 20 : 0);
          } else {
              return ceil10($$.getAxisWidthByAxisId('y2')) + legendWidthOnRight;
          }
      };
  
      c3_chart_internal_fn.getParentRectValue = function (key) {
          var parent = this.selectChart.node(),
              v;
          while (parent && parent.tagName !== 'BODY') {
              try {
                  v = parent.getBoundingClientRect()[key];
              } catch (e) {
                  if (key === 'width') {
                      // In IE in certain cases getBoundingClientRect
                      // will cause an "unspecified error"
                      v = parent.offsetWidth;
                  }
              }
              if (v) {
                  break;
              }
              parent = parent.parentNode;
          }
          return v;
      };
      c3_chart_internal_fn.getParentWidth = function () {
          return this.getParentRectValue('width');
      };
      c3_chart_internal_fn.getParentHeight = function () {
          var h = this.selectChart.style('height');
          return h.indexOf('px') > 0 ? +h.replace('px', '') : 0;
      };
  
      c3_chart_internal_fn.getSvgLeft = function (withoutRecompute) {
          var $$ = this,
              config = $$.config,
              hasLeftAxisRect = config.axis_rotated || !config.axis_rotated && !config.axis_y_inner,
              leftAxisClass = config.axis_rotated ? CLASS.axisX : CLASS.axisY,
              leftAxis = $$.main.select('.' + leftAxisClass).node(),
              svgRect = leftAxis && hasLeftAxisRect ? leftAxis.getBoundingClientRect() : { right: 0 },
              chartRect = $$.selectChart.node().getBoundingClientRect(),
              hasArc = $$.hasArcType(),
              svgLeft = svgRect.right - chartRect.left - (hasArc ? 0 : $$.getCurrentPaddingLeft(withoutRecompute));
          return svgLeft > 0 ? svgLeft : 0;
      };
  
      c3_chart_internal_fn.getAxisWidthByAxisId = function (id, withoutRecompute) {
          var $$ = this,
              position = $$.axis.getLabelPositionById(id);
          return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
      };
      c3_chart_internal_fn.getHorizontalAxisHeight = function (axisId) {
          var $$ = this,
              config = $$.config,
              h = 30;
          if (axisId === 'x' && !config.axis_x_show) {
              return 8;
          }
          if (axisId === 'x' && config.axis_x_height) {
              return config.axis_x_height;
          }
          if (axisId === 'y' && !config.axis_y_show) {
              return config.legend_show && !$$.isLegendRight && !$$.isLegendInset ? 10 : 1;
          }
          if (axisId === 'y2' && !config.axis_y2_show) {
              return $$.rotated_padding_top;
          }
          // Calculate x axis height when tick rotated
          if (axisId === 'x' && !config.axis_rotated && config.axis_x_tick_rotate) {
              h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - config.axis_x_tick_rotate) / 180);
          }
          // Calculate y axis height when tick rotated
          if (axisId === 'y' && config.axis_rotated && config.axis_y_tick_rotate) {
              h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - config.axis_y_tick_rotate) / 180);
          }
          return h + ($$.axis.getLabelPositionById(axisId).isInner ? 0 : 10) + (axisId === 'y2' ? -10 : 0);
      };
  
      c3_chart_internal_fn.getEventRectWidth = function () {
          return Math.max(0, this.xAxis.tickInterval());
      };
  
      c3_chart_internal_fn.initBrush = function () {
          var $$ = this,
              d3 = $$.d3;
          $$.brush = d3.svg.brush().on("brush", function () {
              $$.redrawForBrush();
          });
          $$.brush.update = function () {
              if ($$.context) {
                  $$.context.select('.' + CLASS.brush).call(this);
              }
              return this;
          };
          $$.brush.scale = function (scale) {
              return $$.config.axis_rotated ? this.y(scale) : this.x(scale);
          };
      };
      c3_chart_internal_fn.initSubchart = function () {
          var $$ = this,
              config = $$.config,
              context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context')),
              visibility = config.subchart_show ? 'visible' : 'hidden';
  
          context.style('visibility', visibility);
  
          // Define g for chart area
          context.append('g').attr("clip-path", $$.clipPathForSubchart).attr('class', CLASS.chart);
  
          // Define g for bar chart area
          context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars);
  
          // Define g for line chart area
          context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines);
  
          // Add extent rect for Brush
          context.append("g").attr("clip-path", $$.clipPath).attr("class", CLASS.brush).call($$.brush);
  
          // ATTENTION: This must be called AFTER chart added
          // Add Axis
          $$.axes.subx = context.append("g").attr("class", CLASS.axisX).attr("transform", $$.getTranslate('subx')).attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis).style("visibility", config.subchart_axis_x_show ? visibility : 'hidden');
      };
      c3_chart_internal_fn.updateTargetsForSubchart = function (targets) {
          var $$ = this,
              context = $$.context,
              config = $$.config,
              contextLineEnter,
              contextLineUpdate,
              contextBarEnter,
              contextBarUpdate,
              classChartBar = $$.classChartBar.bind($$),
              classBars = $$.classBars.bind($$),
              classChartLine = $$.classChartLine.bind($$),
              classLines = $$.classLines.bind($$),
              classAreas = $$.classAreas.bind($$);
  
          if (config.subchart_show) {
              //-- Bar --//
              contextBarUpdate = context.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets).attr('class', classChartBar);
              contextBarEnter = contextBarUpdate.enter().append('g').style('opacity', 0).attr('class', classChartBar);
              // Bars for each data
              contextBarEnter.append('g').attr("class", classBars);
  
              //-- Line --//
              contextLineUpdate = context.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets).attr('class', classChartLine);
              contextLineEnter = contextLineUpdate.enter().append('g').style('opacity', 0).attr('class', classChartLine);
              // Lines for each data
              contextLineEnter.append("g").attr("class", classLines);
              // Area
              contextLineEnter.append("g").attr("class", classAreas);
  
              //-- Brush --//
              context.selectAll('.' + CLASS.brush + ' rect').attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
          }
      };
      c3_chart_internal_fn.updateBarForSubchart = function (durationForExit) {
          var $$ = this;
          $$.contextBar = $$.context.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data($$.barData.bind($$));
          $$.contextBar.enter().append('path').attr("class", $$.classBar.bind($$)).style("stroke", 'none').style("fill", $$.color);
          $$.contextBar.style("opacity", $$.initialOpacity.bind($$));
          $$.contextBar.exit().transition().duration(durationForExit).style('opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawBarForSubchart = function (drawBarOnSub, withTransition, duration) {
          (withTransition ? this.contextBar.transition(Math.random().toString()).duration(duration) : this.contextBar).attr('d', drawBarOnSub).style('opacity', 1);
      };
      c3_chart_internal_fn.updateLineForSubchart = function (durationForExit) {
          var $$ = this;
          $$.contextLine = $$.context.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
          $$.contextLine.enter().append('path').attr('class', $$.classLine.bind($$)).style('stroke', $$.color);
          $$.contextLine.style("opacity", $$.initialOpacity.bind($$));
          $$.contextLine.exit().transition().duration(durationForExit).style('opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawLineForSubchart = function (drawLineOnSub, withTransition, duration) {
          (withTransition ? this.contextLine.transition(Math.random().toString()).duration(duration) : this.contextLine).attr("d", drawLineOnSub).style('opacity', 1);
      };
      c3_chart_internal_fn.updateAreaForSubchart = function (durationForExit) {
          var $$ = this,
              d3 = $$.d3;
          $$.contextArea = $$.context.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
          $$.contextArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
              $$.orgAreaOpacity = +d3.select(this).style('opacity');return 0;
          });
          $$.contextArea.style("opacity", 0);
          $$.contextArea.exit().transition().duration(durationForExit).style('opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawAreaForSubchart = function (drawAreaOnSub, withTransition, duration) {
          (withTransition ? this.contextArea.transition(Math.random().toString()).duration(duration) : this.contextArea).attr("d", drawAreaOnSub).style("fill", this.color).style("opacity", this.orgAreaOpacity);
      };
      c3_chart_internal_fn.redrawSubchart = function (withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices) {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config,
              drawAreaOnSub,
              drawBarOnSub,
              drawLineOnSub;
  
          $$.context.style('visibility', config.subchart_show ? 'visible' : 'hidden');
  
          // subchart
          if (config.subchart_show) {
              // reflect main chart to extent on subchart if zoomed
              if (d3.event && d3.event.type === 'zoom') {
                  $$.brush.extent($$.x.orgDomain()).update();
              }
              // update subchart elements if needed
              if (withSubchart) {
  
                  // extent rect
                  if (!$$.brush.empty()) {
                      $$.brush.extent($$.x.orgDomain()).update();
                  }
                  // setup drawer - MEMO: this must be called after axis updated
                  drawAreaOnSub = $$.generateDrawArea(areaIndices, true);
                  drawBarOnSub = $$.generateDrawBar(barIndices, true);
                  drawLineOnSub = $$.generateDrawLine(lineIndices, true);
  
                  $$.updateBarForSubchart(duration);
                  $$.updateLineForSubchart(duration);
                  $$.updateAreaForSubchart(duration);
  
                  $$.redrawBarForSubchart(drawBarOnSub, duration, duration);
                  $$.redrawLineForSubchart(drawLineOnSub, duration, duration);
                  $$.redrawAreaForSubchart(drawAreaOnSub, duration, duration);
              }
          }
      };
      c3_chart_internal_fn.redrawForBrush = function () {
          var $$ = this,
              x = $$.x;
          $$.redraw({
              withTransition: false,
              withY: $$.config.zoom_rescale,
              withSubchart: false,
              withUpdateXDomain: true,
              withDimension: false
          });
          $$.config.subchart_onbrush.call($$.api, x.orgDomain());
      };
      c3_chart_internal_fn.transformContext = function (withTransition, transitions) {
          var $$ = this,
              subXAxis;
          if (transitions && transitions.axisSubX) {
              subXAxis = transitions.axisSubX;
          } else {
              subXAxis = $$.context.select('.' + CLASS.axisX);
              if (withTransition) {
                  subXAxis = subXAxis.transition();
              }
          }
          $$.context.attr("transform", $$.getTranslate('context'));
          subXAxis.attr("transform", $$.getTranslate('subx'));
      };
      c3_chart_internal_fn.getDefaultExtent = function () {
          var $$ = this,
              config = $$.config,
              extent = isFunction(config.axis_x_extent) ? config.axis_x_extent($$.getXDomain($$.data.targets)) : config.axis_x_extent;
          if ($$.isTimeSeries()) {
              extent = [$$.parseDate(extent[0]), $$.parseDate(extent[1])];
          }
          return extent;
      };
  
      c3_chart_internal_fn.initText = function () {
          var $$ = this;
          $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartTexts);
          $$.mainText = $$.d3.selectAll([]);
      };
      c3_chart_internal_fn.updateTargetsForText = function (targets) {
          var $$ = this,
              mainTextUpdate,
              mainTextEnter,
              classChartText = $$.classChartText.bind($$),
              classTexts = $$.classTexts.bind($$),
              classFocus = $$.classFocus.bind($$);
          mainTextUpdate = $$.main.select('.' + CLASS.chartTexts).selectAll('.' + CLASS.chartText).data(targets).attr('class', function (d) {
              return classChartText(d) + classFocus(d);
          });
          mainTextEnter = mainTextUpdate.enter().append('g').attr('class', classChartText).style('opacity', 0).style("pointer-events", "none");
          mainTextEnter.append('g').attr('class', classTexts);
      };
      c3_chart_internal_fn.updateText = function (durationForExit) {
          var $$ = this,
              config = $$.config,
              barOrLineData = $$.barOrLineData.bind($$),
              classText = $$.classText.bind($$);
          $$.mainText = $$.main.selectAll('.' + CLASS.texts).selectAll('.' + CLASS.text).data(barOrLineData);
          $$.mainText.enter().append('text').attr("class", classText).attr('text-anchor', function (d) {
              return config.axis_rotated ? d.value < 0 ? 'end' : 'start' : 'middle';
          }).style("stroke", 'none').style("fill", function (d) {
              return $$.color(d);
          }).style("fill-opacity", 0);
          $$.mainText.text(function (d, i, j) {
              return $$.dataLabelFormat(d.id)(d.value, d.id, i, j);
          });
          $$.mainText.exit().transition().duration(durationForExit).style('fill-opacity', 0).remove();
      };
      c3_chart_internal_fn.redrawText = function (xForText, yForText, forFlow, withTransition) {
          return [(withTransition ? this.mainText.transition() : this.mainText).attr('x', xForText).attr('y', yForText).style("fill", this.color).style("fill-opacity", forFlow ? 0 : this.opacityForText.bind(this))];
      };
      c3_chart_internal_fn.getTextRect = function (text, cls, element) {
          var dummy = this.d3.select('body').append('div').classed('c3', true),
              svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
              font = this.d3.select(element).style('font'),
              rect;
          svg.selectAll('.dummy').data([text]).enter().append('text').classed(cls ? cls : "", true).style('font', font).text(text).each(function () {
              rect = this.getBoundingClientRect();
          });
          dummy.remove();
          return rect;
      };
      c3_chart_internal_fn.generateXYForText = function (areaIndices, barIndices, lineIndices, forX) {
          var $$ = this,
              getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
              getBarPoints = $$.generateGetBarPoints(barIndices, false),
              getLinePoints = $$.generateGetLinePoints(lineIndices, false),
              getter = forX ? $$.getXForText : $$.getYForText;
          return function (d, i) {
              var getPoints = $$.isAreaType(d) ? getAreaPoints : $$.isBarType(d) ? getBarPoints : getLinePoints;
              return getter.call($$, getPoints(d, i), d, this);
          };
      };
      c3_chart_internal_fn.getXForText = function (points, d, textElement) {
          var $$ = this,
              box = textElement.getBoundingClientRect(),
              xPos,
              padding;
          if ($$.config.axis_rotated) {
              padding = $$.isBarType(d) ? 4 : 6;
              xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
          } else {
              xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0];
          }
          // show labels regardless of the domain if value is null
          if (d.value === null) {
              if (xPos > $$.width) {
                  xPos = $$.width - box.width;
              } else if (xPos < 0) {
                  xPos = 4;
              }
          }
          return xPos;
      };
      c3_chart_internal_fn.getYForText = function (points, d, textElement) {
          var $$ = this,
              box = textElement.getBoundingClientRect(),
              yPos;
          if ($$.config.axis_rotated) {
              yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
          } else {
              yPos = points[2][1];
              if (d.value < 0 || d.value === 0 && !$$.hasPositiveValue) {
                  yPos += box.height;
                  if ($$.isBarType(d) && $$.isSafari()) {
                      yPos -= 3;
                  } else if (!$$.isBarType(d) && $$.isChrome()) {
                      yPos += 3;
                  }
              } else {
                  yPos += $$.isBarType(d) ? -3 : -6;
              }
          }
          // show labels regardless of the domain if value is null
          if (d.value === null && !$$.config.axis_rotated) {
              if (yPos < box.height) {
                  yPos = box.height;
              } else if (yPos > this.height) {
                  yPos = this.height - 4;
              }
          }
          return yPos;
      };
  
      c3_chart_internal_fn.initTitle = function () {
          var $$ = this;
          $$.title = $$.svg.append("text").text($$.config.title_text).attr("class", $$.CLASS.title);
      };
      c3_chart_internal_fn.redrawTitle = function () {
          var $$ = this;
          $$.title.attr("x", $$.xForTitle.bind($$)).attr("y", $$.yForTitle.bind($$));
      };
      c3_chart_internal_fn.xForTitle = function () {
          var $$ = this,
              config = $$.config,
              position = config.title_position || 'left',
              x;
          if (position.indexOf('right') >= 0) {
              x = $$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width - config.title_padding.right;
          } else if (position.indexOf('center') >= 0) {
              x = ($$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width) / 2;
          } else {
              // left
              x = config.title_padding.left;
          }
          return x;
      };
      c3_chart_internal_fn.yForTitle = function () {
          var $$ = this;
          return $$.config.title_padding.top + $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).height;
      };
      c3_chart_internal_fn.getTitlePadding = function () {
          var $$ = this;
          return $$.yForTitle() + $$.config.title_padding.bottom;
      };
  
      c3_chart_internal_fn.initTooltip = function () {
          var $$ = this,
              config = $$.config,
              i;
          $$.tooltip = $$.selectChart.style("position", "relative").append("div").attr('class', CLASS.tooltipContainer).style("position", "absolute").style("pointer-events", "none").style("display", "none");
          // Show tooltip if needed
          if (config.tooltip_init_show) {
              if ($$.isTimeSeries() && isString(config.tooltip_init_x)) {
                  config.tooltip_init_x = $$.parseDate(config.tooltip_init_x);
                  for (i = 0; i < $$.data.targets[0].values.length; i++) {
                      if ($$.data.targets[0].values[i].x - config.tooltip_init_x === 0) {
                          break;
                      }
                  }
                  config.tooltip_init_x = i;
              }
              $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
                  return $$.addName(d.values[config.tooltip_init_x]);
              }), $$.axis.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
              $$.tooltip.style("top", config.tooltip_init_position.top).style("left", config.tooltip_init_position.left).style("display", "block");
          }
      };
      c3_chart_internal_fn.getTooltipSortFunction = function () {
          var $$ = this,
              config = $$.config;
  
          if (config.data_groups.length === 0 || config.tooltip_order !== undefined) {
              // if data are not grouped or if an order is specified
              // for the tooltip values we sort them by their values
  
              var order = config.tooltip_order;
              if (order === undefined) {
                  order = config.data_order;
              }
  
              var valueOf = function valueOf(obj) {
                  return obj ? obj.value : null;
              };
  
              // if data are not grouped, we sort them by their value
              if (isString(order) && order.toLowerCase() === 'asc') {
                  return function (a, b) {
                      return valueOf(a) - valueOf(b);
                  };
              } else if (isString(order) && order.toLowerCase() === 'desc') {
                  return function (a, b) {
                      return valueOf(b) - valueOf(a);
                  };
              } else if (isFunction(order)) {
  
                  // if the function is from data_order we need
                  // to wrap the returned function in order to format
                  // the sorted value to the expected format
  
                  var sortFunction = order;
  
                  if (config.tooltip_order === undefined) {
                      sortFunction = function sortFunction(a, b) {
                          return order(a ? {
                              id: a.id,
                              values: [a]
                          } : null, b ? {
                              id: b.id,
                              values: [b]
                          } : null);
                      };
                  }
  
                  return sortFunction;
              } else if (isArray(order)) {
                  return function (a, b) {
                      return order.indexOf(a.id) - order.indexOf(b.id);
                  };
              }
          } else {
              // if data are grouped, we follow the order of grouped targets
              var ids = $$.orderTargets($$.data.targets).map(function (i) {
                  return i.id;
              });
  
              // if it was either asc or desc we need to invert the order
              // returned by orderTargets
              if ($$.isOrderAsc() || $$.isOrderDesc()) {
                  ids = ids.reverse();
              }
  
              return function (a, b) {
                  return ids.indexOf(a.id) - ids.indexOf(b.id);
              };
          }
      };
      c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
          var $$ = this,
              config = $$.config,
              titleFormat = config.tooltip_format_title || defaultTitleFormat,
              nameFormat = config.tooltip_format_name || function (name) {
              return name;
          },
              valueFormat = config.tooltip_format_value || defaultValueFormat,
              text,
              i,
              title,
              value,
              name,
              bgcolor;
  
          var tooltipSortFunction = this.getTooltipSortFunction();
          if (tooltipSortFunction) {
              d.sort(tooltipSortFunction);
          }
  
          for (i = 0; i < d.length; i++) {
              if (!(d[i] && (d[i].value || d[i].value === 0))) {
                  continue;
              }
  
              if (!text) {
                  title = sanitise(titleFormat ? titleFormat(d[i].x) : d[i].x);
                  text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
              }
  
              value = sanitise(valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index, d));
              if (value !== undefined) {
                  // Skip elements when their name is set to null
                  if (d[i].name === null) {
                      continue;
                  }
                  name = sanitise(nameFormat(d[i].name, d[i].ratio, d[i].id, d[i].index));
                  bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
  
                  text += "<tr class='" + $$.CLASS.tooltipName + "-" + $$.getTargetSelectorSuffix(d[i].id) + "'>";
                  text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
                  text += "<td class='value'>" + value + "</td>";
                  text += "</tr>";
              }
          }
          return text + "</table>";
      };
      c3_chart_internal_fn.tooltipPosition = function (dataToShow, tWidth, tHeight, element) {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3;
          var svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
          var forArc = $$.hasArcType(),
              mouse = d3.mouse(element);
          // Determin tooltip position
          if (forArc) {
              tooltipLeft = ($$.width - ($$.isLegendRight ? $$.getLegendWidth() : 0)) / 2 + mouse[0];
              tooltipTop = ($$.hasType('gauge') ? $$.height : $$.height / 2) + mouse[1] + 20;
          } else {
              svgLeft = $$.getSvgLeft(true);
              if (config.axis_rotated) {
                  tooltipLeft = svgLeft + mouse[0] + 100;
                  tooltipRight = tooltipLeft + tWidth;
                  chartRight = $$.currentWidth - $$.getCurrentPaddingRight();
                  tooltipTop = $$.x(dataToShow[0].x) + 20;
              } else {
                  tooltipLeft = svgLeft + $$.getCurrentPaddingLeft(true) + $$.x(dataToShow[0].x) + 20;
                  tooltipRight = tooltipLeft + tWidth;
                  chartRight = svgLeft + $$.currentWidth - $$.getCurrentPaddingRight();
                  tooltipTop = mouse[1] + 15;
              }
  
              if (tooltipRight > chartRight) {
                  // 20 is needed for Firefox to keep tooltip width
                  tooltipLeft -= tooltipRight - chartRight + 20;
              }
              if (tooltipTop + tHeight > $$.currentHeight) {
                  tooltipTop -= tHeight + 30;
              }
          }
          if (tooltipTop < 0) {
              tooltipTop = 0;
          }
          return { top: tooltipTop, left: tooltipLeft };
      };
      c3_chart_internal_fn.showTooltip = function (selectedData, element) {
          var $$ = this,
              config = $$.config;
          var tWidth, tHeight, position;
          var forArc = $$.hasArcType(),
              dataToShow = selectedData.filter(function (d) {
              return d && isValue(d.value);
          }),
              positionFunction = config.tooltip_position || c3_chart_internal_fn.tooltipPosition;
          if (dataToShow.length === 0 || !config.tooltip_show) {
              return;
          }
          $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.axis.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block");
  
          // Get tooltip dimensions
          tWidth = $$.tooltip.property('offsetWidth');
          tHeight = $$.tooltip.property('offsetHeight');
  
          position = positionFunction.call(this, dataToShow, tWidth, tHeight, element);
          // Set tooltip
          $$.tooltip.style("top", position.top + "px").style("left", position.left + 'px');
      };
      c3_chart_internal_fn.hideTooltip = function () {
          this.tooltip.style("display", "none");
      };
  
      c3_chart_internal_fn.setTargetType = function (targetIds, type) {
          var $$ = this,
              config = $$.config;
          $$.mapToTargetIds(targetIds).forEach(function (id) {
              $$.withoutFadeIn[id] = type === config.data_types[id];
              config.data_types[id] = type;
          });
          if (!targetIds) {
              config.data_type = type;
          }
      };
      c3_chart_internal_fn.hasType = function (type, targets) {
          var $$ = this,
              types = $$.config.data_types,
              has = false;
          targets = targets || $$.data.targets;
          if (targets && targets.length) {
              targets.forEach(function (target) {
                  var t = types[target.id];
                  if (t && t.indexOf(type) >= 0 || !t && type === 'line') {
                      has = true;
                  }
              });
          } else if (Object.keys(types).length) {
              Object.keys(types).forEach(function (id) {
                  if (types[id] === type) {
                      has = true;
                  }
              });
          } else {
              has = $$.config.data_type === type;
          }
          return has;
      };
      c3_chart_internal_fn.hasArcType = function (targets) {
          return this.hasType('pie', targets) || this.hasType('donut', targets) || this.hasType('gauge', targets);
      };
      c3_chart_internal_fn.isLineType = function (d) {
          var config = this.config,
              id = isString(d) ? d : d.id;
          return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isStepType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isSplineType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isAreaType = function (d) {
          var id = isString(d) ? d : d.id;
          return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
      };
      c3_chart_internal_fn.isBarType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'bar';
      };
      c3_chart_internal_fn.isScatterType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'scatter';
      };
      c3_chart_internal_fn.isPieType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'pie';
      };
      c3_chart_internal_fn.isGaugeType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'gauge';
      };
      c3_chart_internal_fn.isDonutType = function (d) {
          var id = isString(d) ? d : d.id;
          return this.config.data_types[id] === 'donut';
      };
      c3_chart_internal_fn.isArcType = function (d) {
          return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
      };
      c3_chart_internal_fn.lineData = function (d) {
          return this.isLineType(d) ? [d] : [];
      };
      c3_chart_internal_fn.arcData = function (d) {
          return this.isArcType(d.data) ? [d] : [];
      };
      /* not used
       function scatterData(d) {
       return isScatterType(d) ? d.values : [];
       }
       */
      c3_chart_internal_fn.barData = function (d) {
          return this.isBarType(d) ? d.values : [];
      };
      c3_chart_internal_fn.lineOrScatterData = function (d) {
          return this.isLineType(d) || this.isScatterType(d) ? d.values : [];
      };
      c3_chart_internal_fn.barOrLineData = function (d) {
          return this.isBarType(d) || this.isLineType(d) ? d.values : [];
      };
      c3_chart_internal_fn.isInterpolationType = function (type) {
          return ['linear', 'linear-closed', 'basis', 'basis-open', 'basis-closed', 'bundle', 'cardinal', 'cardinal-open', 'cardinal-closed', 'monotone'].indexOf(type) >= 0;
      };
  
      c3_chart_internal_fn.isSafari = function () {
          var ua = window.navigator.userAgent;
          return ua.indexOf('Safari') >= 0 && ua.indexOf('Chrome') < 0;
      };
      c3_chart_internal_fn.isChrome = function () {
          var ua = window.navigator.userAgent;
          return ua.indexOf('Chrome') >= 0;
      };
  
      c3_chart_internal_fn.initZoom = function () {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config,
              startEvent;
  
          $$.zoom = d3.behavior.zoom().on("zoomstart", function () {
              startEvent = d3.event.sourceEvent;
              $$.zoom.altDomain = d3.event.sourceEvent.altKey ? $$.x.orgDomain() : null;
              config.zoom_onzoomstart.call($$.api, d3.event.sourceEvent);
          }).on("zoom", function () {
              $$.redrawForZoom.call($$);
          }).on('zoomend', function () {
              var event = d3.event.sourceEvent;
              // if click, do nothing. otherwise, click interaction will be canceled.
              if (event && startEvent.clientX === event.clientX && startEvent.clientY === event.clientY) {
                  return;
              }
              $$.redrawEventRect();
              $$.updateZoom();
              config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
          });
          $$.zoom.scale = function (scale) {
              return config.axis_rotated ? this.y(scale) : this.x(scale);
          };
          $$.zoom.orgScaleExtent = function () {
              var extent = config.zoom_extent ? config.zoom_extent : [1, 10];
              return [extent[0], Math.max($$.getMaxDataCount() / extent[1], extent[1])];
          };
          $$.zoom.updateScaleExtent = function () {
              var ratio = diffDomain($$.x.orgDomain()) / diffDomain($$.getZoomDomain()),
                  extent = this.orgScaleExtent();
              this.scaleExtent([extent[0] * ratio, extent[1] * ratio]);
              return this;
          };
      };
      c3_chart_internal_fn.getZoomDomain = function () {
          var $$ = this,
              config = $$.config,
              d3 = $$.d3,
              min = d3.min([$$.orgXDomain[0], config.zoom_x_min]),
              max = d3.max([$$.orgXDomain[1], config.zoom_x_max]);
          return [min, max];
      };
      c3_chart_internal_fn.updateZoom = function () {
          var $$ = this,
              z = $$.config.zoom_enabled ? $$.zoom : function () {};
          $$.main.select('.' + CLASS.zoomRect).call(z).on("dblclick.zoom", null);
          $$.main.selectAll('.' + CLASS.eventRect).call(z).on("dblclick.zoom", null);
      };
      c3_chart_internal_fn.redrawForZoom = function () {
          var $$ = this,
              d3 = $$.d3,
              config = $$.config,
              zoom = $$.zoom,
              x = $$.x;
          if (!config.zoom_enabled) {
              return;
          }
          if ($$.filterTargetsToShow($$.data.targets).length === 0) {
              return;
          }
          if (d3.event.sourceEvent.type === 'mousemove' && zoom.altDomain) {
              x.domain(zoom.altDomain);
              zoom.scale(x).updateScaleExtent();
              return;
          }
          if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
              x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
          }
          $$.redraw({
              withTransition: false,
              withY: config.zoom_rescale,
              withSubchart: false,
              withEventRect: false,
              withDimension: false
          });
          if (d3.event.sourceEvent.type === 'mousemove') {
              $$.cancelClick = true;
          }
          config.zoom_onzoom.call($$.api, x.orgDomain());
      };
  
      return c3;
  
  })));
  