text: /**
   * @license Highstock JS v4.2.6 (2016-08-02)
   *
   * (c) 2014 Highsoft AS
   * Authors: Jon Arild Nygard / Oystein Moseng
   *
   * License: www.highcharts.com/license
   */
  
  (function (factory) {
  	if (typeof module === 'object' && module.exports) {
  		module.exports = factory;
  	} else {
  		factory(Highcharts);
  	}
  }(function (H) {
  	var seriesTypes = H.seriesTypes,
  		map = H.map,
  		merge = H.merge,
  		extend = H.extend,
  		extendClass = H.extendClass,
  		defaultOptions = H.getOptions(),
  		plotOptions = defaultOptions.plotOptions,
  		noop = function () {
  		},
  		each = H.each,
  		grep = H.grep,
  		pick = H.pick,
  		Series = H.Series,
  		stableSort = H.stableSort,
  		Color = H.Color,
  		eachObject = function (list, func, context) {
  			var key;
  			context = context || this;
  			for (key in list) {
  				if (list.hasOwnProperty(key)) {
  					func.call(context, list[key], key, list);
  				}
  			}
  		},
  		reduce = function (arr, func, previous, context) {
  			context = context || this;
  			arr = arr || []; // @note should each be able to handle empty values automatically?
  			each(arr, function (current, i) {
  				previous = func.call(context, previous, current, i, arr);
  			});
  			return previous;
  		},
  		// @todo find correct name for this function. 
  		// @todo Similar to reduce, this function is likely redundant
  		recursive = function (item, func, context) {
  			var next;
  			context = context || this;
  			next = func.call(context, item);
  			if (next !== false) {
  				recursive(next, func, context);
  			}
  		};
  
  	// Define default options
  	plotOptions.treemap = merge(plotOptions.scatter, {
  		showInLegend: false,
  		marker: false,
  		borderColor: '#E0E0E0',
  		borderWidth: 1,
  		dataLabels: {
  			enabled: true,
  			defer: false,
  			verticalAlign: 'middle',
  			formatter: function () { // #2945
  				return this.point.name || this.point.id;
  			},
  			inside: true
  		},
  		tooltip: {
  			headerFormat: '',
  			pointFormat: '<b>{point.name}</b>: {point.value}</b><br/>'
  		},
  		layoutAlgorithm: 'sliceAndDice',
  		layoutStartingDirection: 'vertical',
  		alternateStartingDirection: false,
  		levelIsConstant: true,
  		opacity: 0.15,
  		states: {
  			hover: {
  				borderColor: '#A0A0A0',
  				brightness: seriesTypes.heatmap ? 0 : 0.1,
  				opacity: 0.75,
  				shadow: false
  			}
  		},
  		drillUpButton: {
  			position: { 
  				align: 'right',
  				x: -10,
  				y: 10
  			}
  		}
  	});
  	
  	// Stolen from heatmap	
  	var colorSeriesMixin = {
  		// mapping between SVG attributes and the corresponding options
  		pointAttrToOptions: {},
  		pointArrayMap: ['value'],
  		axisTypes: seriesTypes.heatmap ? ['xAxis', 'yAxis', 'colorAxis'] : ['xAxis', 'yAxis'],
  		optionalAxis: 'colorAxis',
  		getSymbol: noop,
  		parallelArrays: ['x', 'y', 'value', 'colorValue'],
  		colorKey: 'colorValue', // Point color option key
  		translateColors: seriesTypes.heatmap && seriesTypes.heatmap.prototype.translateColors
  	};
  
  	// The Treemap series type
  	seriesTypes.treemap = extendClass(seriesTypes.scatter, merge(colorSeriesMixin, {
  		type: 'treemap',
  		trackerGroups: ['group', 'dataLabelsGroup'],
  		pointClass: extendClass(H.Point, {
  			setVisible: seriesTypes.pie.prototype.pointClass.prototype.setVisible
  		}),
  		/**
  		 * Creates an object map from parent id to childrens index.
  		 * @param {Array} data List of points set in options.
  		 * @param {string} data[].parent Parent id of point.
  		 * @param {Array} ids List of all point ids.
  		 * @return {Object} Map from parent id to children index in data.
  		 */
  		getListOfParents: function (data, ids) {
  			var listOfParents = reduce(data, function (prev, curr, i) {
  				var parent = pick(curr.parent, '');
  				if (prev[parent] === undefined) {
  					prev[parent] = [];
  				}
  				prev[parent].push(i);
  				return prev;
  			}, {});
  
  			// If parent does not exist, hoist parent to root of tree.
  			eachObject(listOfParents, function (children, parent, list) {
  				if ((parent !== '') && (H.inArray(parent, ids) === -1)) {
  					each(children, function (child) {
  						list[''].push(child);
  					});
  					delete list[parent];
  				}
  			});
  			return listOfParents;
  		},
  		/**
  		* Creates a tree structured object from the series points
  		*/
  		getTree: function () {
  			var tree,
  				series = this,
  				allIds = map(this.data, function (d) {
  					return d.id;
  				}),
  				parentList = series.getListOfParents(this.data, allIds);
  
  			series.nodeMap = [];
  			tree = series.buildNode('', -1, 0, parentList, null);
  			// Parents of the root node is by default visible
  			recursive(this.nodeMap[this.rootNode], function (node) {
  				var next = false,
  					p = node.parent;
  				node.visible = true;
  				if (p || p === '') {
  					next = series.nodeMap[p];
  				}
  				return next;
  			});
  			// Children of the root node is by default visible
  			recursive(this.nodeMap[this.rootNode].children, function (children) {
  				var next = false;
  				each(children, function (child) {
  					child.visible = true;
  					if (child.children.length) {
  						next = (next || []).concat(child.children);
  					}
  				});
  				return next;
  			});
  			this.setTreeValues(tree);
  			return tree;
  		},
  		init: function (chart, options) {
  			var series = this;
  			Series.prototype.init.call(series, chart, options);
  			if (series.options.allowDrillToNode) {
  				series.drillTo();
  			}
  		},
  		buildNode: function (id, i, level, list, parent) {
  			var series = this,
  				children = [],
  				point = series.points[i],
  				node,
  				child;
  
  			// Actions
  			each((list[id] || []), function (i) {
  				child = series.buildNode(series.points[i].id, i, (level + 1), list, id);
  				children.push(child);
  			});
  			node = {
  				id: id,
  				i: i,
  				children: children,
  				level: level,
  				parent: parent,
  				visible: false // @todo move this to better location
  			};
  			series.nodeMap[node.id] = node;
  			if (point) {
  				point.node = node;
  			}
  			return node;
  		},
  		setTreeValues: function (tree) {
  			var series = this,
  				options = series.options,
  				childrenTotal = 0,
  				children = [],
  				val,
  				point = series.points[tree.i];
  
  			// First give the children some values
  			each(tree.children, function (child) {
  				child = series.setTreeValues(child);
  				children.push(child);
  
  				if (!child.ignore) {
  					childrenTotal += child.val;
  				} else {
  					// @todo Add predicate to avoid looping already ignored children
  					recursive(child.children, function (children) {
  						var next = false;
  						each(children, function (node) {
  							extend(node, {
  								ignore: true,
  								isLeaf: false,
  								visible: false
  							});
  							if (node.children.length) {
  								next = (next || []).concat(node.children);
  							}
  						});
  						return next;
  					});
  				}
  			});
  			// Sort the children
  			stableSort(children, function (a, b) {
  				return a.sortIndex - b.sortIndex;
  			});
  			// Set the values
  			val = pick(point && point.options.value, childrenTotal);
  			if (point) {
  				point.value = val;
  			}
  			extend(tree, {
  				children: children,
  				childrenTotal: childrenTotal,
  				// Ignore this node if point is not visible
  				ignore: !(pick(point && point.visible, true) && (val > 0)),
  				isLeaf: tree.visible && !childrenTotal,
  				levelDynamic: (options.levelIsConstant ? tree.level : (tree.level - series.nodeMap[series.rootNode].level)),
  				name: pick(point && point.name, ''),
  				sortIndex: pick(point && point.sortIndex, -val),
  				val: val
  			});
  			return tree;
  		},
  		/**
  		 * Recursive function which calculates the area for all children of a node.
  		 * @param {Object} node The node which is parent to the children.
  		 * @param {Object} area The rectangular area of the parent.
  		 */
  		calculateChildrenAreas: function (parent, area) {
  			var series = this,
  				options = series.options,
  				level = this.levelMap[parent.levelDynamic + 1],
  				algorithm = pick((series[level && level.layoutAlgorithm] && level.layoutAlgorithm), options.layoutAlgorithm),
  				alternate = options.alternateStartingDirection,
  				childrenValues = [],
  				children;
  
  			// Collect all children which should be included
  			children = grep(parent.children, function (n) {
  				return !n.ignore;
  			});
  
  			if (level && level.layoutStartingDirection) {
  				area.direction = level.layoutStartingDirection === 'vertical' ? 0 : 1;
  			}
  			childrenValues = series[algorithm](area, children);
  			each(children, function (child, index) {
  				var values = childrenValues[index];
  				child.values = merge(values, {
  					val: child.childrenTotal,
  					direction: (alternate ? 1 - area.direction : area.direction)
  				});
  				child.pointValues = merge(values, {
  					x: (values.x / series.axisRatio),
  					width: (values.width / series.axisRatio) 
  				});
  				// If node has children, then call method recursively
  				if (child.children.length) {
  					series.calculateChildrenAreas(child, child.values);
  				}
  			});
  		},
  		setPointValues: function () {
  			var series = this,
  				xAxis = series.xAxis,
  				yAxis = series.yAxis;
  			each(series.points, function (point) {
  				var node = point.node,
  					values = node.pointValues,
  					x1,
  					x2,
  					y1,
  					y2;
  				// Points which is ignored, have no values.
  				if (values && node.visible) {
  					x1 = Math.round(xAxis.translate(values.x, 0, 0, 0, 1));
  					x2 = Math.round(xAxis.translate(values.x + values.width, 0, 0, 0, 1));
  					y1 = Math.round(yAxis.translate(values.y, 0, 0, 0, 1));
  					y2 = Math.round(yAxis.translate(values.y + values.height, 0, 0, 0, 1));
  					// Set point values
  					point.shapeType = 'rect';
  					point.shapeArgs = {
  						x: Math.min(x1, x2),
  						y: Math.min(y1, y2),
  						width: Math.abs(x2 - x1),
  						height: Math.abs(y2 - y1)
  					};
  					point.plotX = point.shapeArgs.x + (point.shapeArgs.width / 2);
  					point.plotY = point.shapeArgs.y + (point.shapeArgs.height / 2);
  				} else {
  					// Reset visibility
  					delete point.plotX;
  					delete point.plotY;
  				}
  			});
  		},
  		setColorRecursive: function (node, color) {
  			var series = this,
  				point,
  				level;
  			if (node) {
  				point = series.points[node.i];
  				level = series.levelMap[node.levelDynamic];
  				// Select either point color, level color or inherited color.
  				color = pick(point && point.options.color, level && level.color, color);
  				if (point) {
  					point.color = color;
  				}
  				// Do it all again with the children	
  				if (node.children.length) {
  					each(node.children, function (child) {
  						series.setColorRecursive(child, color);
  					});
  				}
  			}
  		},
  		algorithmGroup: function (h, w, d, p) {
  			this.height = h;
  			this.width = w;
  			this.plot = p;
  			this.direction = d;
  			this.startDirection = d;
  			this.total = 0;
  			this.nW = 0;
  			this.lW = 0;
  			this.nH = 0;
  			this.lH = 0;
  			this.elArr = [];
  			this.lP = {
  				total: 0,
  				lH: 0,
  				nH: 0,
  				lW: 0,
  				nW: 0,
  				nR: 0,
  				lR: 0,
  				aspectRatio: function (w, h) {
  					return Math.max((w / h), (h / w));
  				}
  			};
  			this.addElement = function (el) {
  				this.lP.total = this.elArr[this.elArr.length - 1];
  				this.total = this.total + el;
  				if (this.direction === 0) {
  					// Calculate last point old aspect ratio
  					this.lW = this.nW;
  					this.lP.lH = this.lP.total / this.lW;
  					this.lP.lR = this.lP.aspectRatio(this.lW, this.lP.lH);
  					// Calculate last point new aspect ratio
  					this.nW = this.total / this.height;
  					this.lP.nH = this.lP.total / this.nW;
  					this.lP.nR = this.lP.aspectRatio(this.nW, this.lP.nH);
  				} else {
  					// Calculate last point old aspect ratio
  					this.lH = this.nH;
  					this.lP.lW = this.lP.total / this.lH;
  					this.lP.lR = this.lP.aspectRatio(this.lP.lW, this.lH);
  					// Calculate last point new aspect ratio
  					this.nH = this.total / this.width;
  					this.lP.nW = this.lP.total / this.nH;
  					this.lP.nR = this.lP.aspectRatio(this.lP.nW, this.nH);
  				}
  				this.elArr.push(el);						
  			};
  			this.reset = function () {
  				this.nW = 0;
  				this.lW = 0;
  				this.elArr = [];
  				this.total = 0;
  			};
  		},
  		algorithmCalcPoints: function (directionChange, last, group, childrenArea) {
  			var pX,
  				pY,
  				pW,
  				pH,
  				gW = group.lW,
  				gH = group.lH,
  				plot = group.plot,
  				keep,
  				i = 0,
  				end = group.elArr.length - 1;
  			if (last) {
  				gW = group.nW;
  				gH = group.nH;
  			} else {
  				keep = group.elArr[group.elArr.length - 1];
  			}
  			each(group.elArr, function (p) {
  				if (last || (i < end)) {
  					if (group.direction === 0) {
  						pX = plot.x;
  						pY = plot.y; 
  						pW = gW;
  						pH = p / pW;
  					} else {
  						pX = plot.x;
  						pY = plot.y;
  						pH = gH;
  						pW = p / pH;
  					}
  					childrenArea.push({
  						x: pX,
  						y: pY,
  						width: pW,
  						height: pH
  					});
  					if (group.direction === 0) {
  						plot.y = plot.y + pH;
  					} else {
  						plot.x = plot.x + pW;
  					}						
  				}
  				i = i + 1;
  			});
  			// Reset variables
  			group.reset();
  			if (group.direction === 0) {
  				group.width = group.width - gW;
  			} else {
  				group.height = group.height - gH;
  			}
  			plot.y = plot.parent.y + (plot.parent.height - group.height);
  			plot.x = plot.parent.x + (plot.parent.width - group.width);
  			if (directionChange) {
  				group.direction = 1 - group.direction;
  			}
  			// If not last, then add uncalculated element
  			if (!last) {
  				group.addElement(keep);
  			}
  		},
  		algorithmLowAspectRatio: function (directionChange, parent, children) {
  			var childrenArea = [],
  				series = this,
  				pTot,
  				plot = {
  					x: parent.x,
  					y: parent.y,
  					parent: parent
  				},
  				direction = parent.direction,
  				i = 0,
  				end = children.length - 1,
  				group = new this.algorithmGroup(parent.height, parent.width, direction, plot);
  			// Loop through and calculate all areas
  			each(children, function (child) {
  				pTot = (parent.width * parent.height) * (child.val / parent.val);
  				group.addElement(pTot);
  				if (group.lP.nR > group.lP.lR) {
  					series.algorithmCalcPoints(directionChange, false, group, childrenArea, plot);
  				}
  				// If last child, then calculate all remaining areas
  				if (i === end) {
  					series.algorithmCalcPoints(directionChange, true, group, childrenArea, plot);
  				}
  				i = i + 1;
  			});
  			return childrenArea;
  		},
  		algorithmFill: function (directionChange, parent, children) {
  			var childrenArea = [],
  				pTot,
  				direction = parent.direction,
  				x = parent.x,
  				y = parent.y,
  				width = parent.width,
  				height = parent.height,
  				pX,
  				pY,
  				pW,
  				pH;
  			each(children, function (child) {
  				pTot = (parent.width * parent.height) * (child.val / parent.val);
  				pX = x;
  				pY = y;
  				if (direction === 0) {
  					pH = height;
  					pW = pTot / pH;
  					width = width - pW;
  					x = x + pW;
  				} else {
  					pW = width;
  					pH = pTot / pW;
  					height = height - pH;
  					y = y + pH;
  				}
  				childrenArea.push({
  					x: pX,
  					y: pY,
  					width: pW,
  					height: pH
  				});
  				if (directionChange) {
  					direction = 1 - direction;
  				}
  			});
  			return childrenArea;
  		},
  		strip: function (parent, children) {
  			return this.algorithmLowAspectRatio(false, parent, children);
  		},
  		squarified: function (parent, children) {
  			return this.algorithmLowAspectRatio(true, parent, children);
  		},
  		sliceAndDice: function (parent, children) {
  			return this.algorithmFill(true, parent, children);
  		},
  		stripes: function (parent, children) {
  			return this.algorithmFill(false, parent, children);
  		},
  		translate: function () {
  			var pointValues,
  				seriesArea,
  				tree,
  				val;
  
  			// Call prototype function
  			Series.prototype.translate.call(this);
  
  			// Assign variables
  			this.rootNode = pick(this.options.rootId, '');
  			// Create a object map from level to options
  			this.levelMap = reduce(this.options.levels, function (arr, item) {
  				arr[item.level] = item;
  				return arr;
  			}, {});
  			tree = this.tree = this.getTree(); // @todo Only if series.isDirtyData is true
  
  			// Calculate plotting values.
  			this.axisRatio = (this.xAxis.len / this.yAxis.len);
  			this.nodeMap[''].pointValues = pointValues = { x: 0, y: 0, width: 100, height: 100 };
  			this.nodeMap[''].values = seriesArea = merge(pointValues, {
  				width: (pointValues.width * this.axisRatio),
  				direction: (this.options.layoutStartingDirection === 'vertical' ? 0 : 1),
  				val: tree.val
  			});
  			this.calculateChildrenAreas(tree, seriesArea);
  
  			// Logic for point colors
  			if (this.colorAxis) {
  				this.translateColors();
  			} else if (!this.options.colorByPoint) {
  				this.setColorRecursive(this.tree, undefined);
  			}
  
  			// Update axis extremes according to the root node.
  			if (this.options.allowDrillToNode) {
  				val = this.nodeMap[this.rootNode].pointValues;
  				this.xAxis.setExtremes(val.x, val.x + val.width, false);
  				this.yAxis.setExtremes(val.y, val.y + val.height, false);
  				this.xAxis.setScale();
  				this.yAxis.setScale();
  			}
  
  			// Assign values to points.
  			this.setPointValues();
  		},
  		/**
  		 * Extend drawDataLabels with logic to handle custom options related to the treemap series:
  		 * - Points which is not a leaf node, has dataLabels disabled by default.
  		 * - Options set on series.levels is merged in.
  		 * - Width of the dataLabel is set to match the width of the point shape.
  		 */
  		drawDataLabels: function () {
  			var series = this,
  				points = grep(series.points, function (n) {
  					return n.node.visible;
  				}),
  				options,
  				level;
  			each(points, function (point) {
  				level = series.levelMap[point.node.levelDynamic];
  				// Set options to new object to avoid problems with scope
  				options = { style: {} };
  
  				// If not a leaf, then label should be disabled as default
  				if (!point.node.isLeaf) {
  					options.enabled = false;
  				}
  
  				// If options for level exists, include them as well
  				if (level && level.dataLabels) {
  					options = merge(options, level.dataLabels);
  					series._hasPointLabels = true;
  				}
  
  				// Set dataLabel width to the width of the point shape.
  				if (point.shapeArgs) {
  					options.style.width = point.shapeArgs.width;
  					if (point.dataLabel) {
  						point.dataLabel.css({ width: point.shapeArgs.width + 'px' });
  					}
  				}
  
  				// Merge custom options with point options
  				point.dlOptions = merge(options, point.options.dataLabels);
  			});
  			Series.prototype.drawDataLabels.call(this);
  		},
  		alignDataLabel: seriesTypes.column.prototype.alignDataLabel,
  
  		/**
  		 * Get presentational attributes
  		 */
  		pointAttribs: function (point, state) {
  			var level = this.levelMap[point.node.levelDynamic] || {},
  				options = this.options,
  				attr,
  				stateOptions = (state && options.states[state]) || {},
  				opacity;
  
  			// Set attributes by precedence. Point trumps level trumps series. Stroke width uses pick
  			// because it can be 0.
  			attr = {
  				'stroke': point.borderColor || level.borderColor || stateOptions.borderColor || options.borderColor,
  				'stroke-width': pick(point.borderWidth, level.borderWidth, stateOptions.borderWidth, options.borderWidth),
  				'dashstyle': point.borderDashStyle || level.borderDashStyle || stateOptions.borderDashStyle || options.borderDashStyle,
  				'fill': point.color || this.color,
  				'zIndex': state === 'hover' ? 1 : 0
  			};
  
  			if (point.node.level <= this.nodeMap[this.rootNode].level) {
  				// Hide levels above the current view
  				attr.fill = 'none';
  				attr['stroke-width'] = 0;
  			} else if (!point.node.isLeaf) {
  				// If not a leaf, either set opacity or remove fill
  				if (pick(options.interactByLeaf, !options.allowDrillToNode)) {
  					attr.fill = 'none';
  				} else {
  					opacity = pick(stateOptions.opacity, options.opacity);
  					attr.fill = Color(attr.fill).setOpacity(opacity).get();
  				}
  			} else if (state) {
  				// Brighten and hoist the hover nodes
  				attr.fill = Color(attr.fill).brighten(stateOptions.brightness).get();
  			}
  			return attr;
  		},
  
  		/**
  		* Extending ColumnSeries drawPoints
  		*/
  		drawPoints: function () {
  			var series = this,
  				points = grep(series.points, function (n) {
  					return n.node.visible;
  				});
  
  			each(points, function (point) {
  				var groupKey = 'levelGroup-' + point.node.levelDynamic,
  					pointAttribs,
  					crispCorr;
  				if (!series[groupKey]) {
  					series[groupKey] = series.chart.renderer.g(groupKey)
  						.attr({
  							zIndex: 1000 - point.node.levelDynamic // @todo Set the zIndex based upon the number of levels, instead of using 1000
  						})
  						.add(series.group);
  				}
  				point.group = series[groupKey];
  				// Preliminary code in prepraration for HC5 that uses pointAttribs for all series
  				pointAttribs = series.pointAttribs(point);
  				point.pointAttr = {
  					'': pointAttribs,
  					'hover': series.pointAttribs(point, 'hover'),
  					'select': {}
  				};
  
  				// Crisp correction
  				crispCorr = parseInt(pointAttribs['stroke-width'], 10) % 2 / 2;
  				point.shapeArgs.x -= crispCorr;
  				point.shapeArgs.y -= crispCorr;
  			});
  			// Call standard drawPoints
  			seriesTypes.column.prototype.drawPoints.call(this);
  
  			// If drillToNode is allowed, set a point cursor on clickables & add drillId to point 
  			if (series.options.allowDrillToNode) {
  				each(points, function (point) {
  					var cursor,
  						drillId;
  					if (point.graphic) {
  						drillId = point.drillId = series.options.interactByLeaf ? series.drillToByLeaf(point) : series.drillToByGroup(point);
  						cursor = drillId ? 'pointer' : 'default';
  						point.graphic.css({ cursor: cursor });
  					}
  				});
  			}
  		},
  		/**
  		* Add drilling on the suitable points
  		*/
  		drillTo: function () {
  			var series = this;
  			H.addEvent(series, 'click', function (event) {
  				var point = event.point,
  					drillId = point.drillId,
  					drillName;
  				// If a drill id is returned, add click event and cursor. 
  				if (drillId) {
  					drillName = series.nodeMap[series.rootNode].name || series.rootNode;
  					point.setState(''); // Remove hover
  					series.drillToNode(drillId);
  					series.showDrillUpButton(drillName);
  				}
  			});
  		},
  		/**
  		* Finds the drill id for a parent node.
  		* Returns false if point should not have a click event
  		* @param {Object} point
  		* @return {string || boolean} Drill to id or false when point should not have a click event
  		*/
  		drillToByGroup: function (point) {
  			var series = this,
  				drillId = false;
  			if ((point.node.level - series.nodeMap[series.rootNode].level) === 1 && !point.node.isLeaf) {
  				drillId = point.id;
  			}
  			return drillId;
  		},
  		/**
  		* Finds the drill id for a leaf node.
  		* Returns false if point should not have a click event
  		* @param {Object} point
  		* @return {string || boolean} Drill to id or false when point should not have a click event
  		*/
  		drillToByLeaf: function (point) {
  			var series = this,
  				drillId = false,
  				nodeParent;
  			if ((point.node.parent !== series.rootNode) && (point.node.isLeaf)) {
  				nodeParent = point.node;
  				while (!drillId) {
  					nodeParent = series.nodeMap[nodeParent.parent];
  					if (nodeParent.parent === series.rootNode) {
  						drillId = nodeParent.id;
  					}
  				}
  			}
  			return drillId;
  		},
  		drillUp: function () {
  			var drillPoint = null,
  				node,
  				parent;
  			if (this.rootNode) {
  				node = this.nodeMap[this.rootNode];
  				if (node.parent !== null) {
  					drillPoint = this.nodeMap[node.parent];
  				} else {
  					drillPoint = this.nodeMap[''];
  				}
  			}
  
  			if (drillPoint !== null) {
  				this.drillToNode(drillPoint.id);
  				if (drillPoint.id === '') {
  					this.drillUpButton = this.drillUpButton.destroy();
  				} else {
  					parent = this.nodeMap[drillPoint.parent];
  					this.showDrillUpButton((parent.name || parent.id));
  				}
  			} 
  		},
  		drillToNode: function (id) {
  			this.options.rootId = id;
  			this.isDirty = true; // Force redraw
  			this.chart.redraw();
  		},
  		showDrillUpButton: function (name) {
  			var series = this,
  				backText = (name || '< Back'),
  				buttonOptions = series.options.drillUpButton,
  				attr,
  				states;
  
  			if (buttonOptions.text) {
  				backText = buttonOptions.text;
  			}
  			if (!this.drillUpButton) {
  				attr = buttonOptions.theme;
  				states = attr && attr.states;
  							
  				this.drillUpButton = this.chart.renderer.button(
  					backText,
  					null,
  					null,
  					function () {
  						series.drillUp(); 
  					},
  					attr, 
  					states && states.hover,
  					states && states.select
  				)
  				.attr({
  					align: buttonOptions.position.align,
  					zIndex: 9
  				})
  				.add()
  				.align(buttonOptions.position, false, buttonOptions.relativeTo || 'plotBox');
  			} else {
  				this.drillUpButton.attr({
  					text: backText
  				})
  				.align();
  			}
  		},
  		buildKDTree: noop,
  		drawLegendSymbol: H.LegendSymbolMixin.drawRectangle,
  		getExtremes: function () {
  			// Get the extremes from the value data
  			Series.prototype.getExtremes.call(this, this.colorValueData);
  			this.valueMin = this.dataMin;
  			this.valueMax = this.dataMax;
  
  			// Get the extremes from the y data
  			Series.prototype.getExtremes.call(this);
  		},
  		getExtremesFromAll: true,
  		bindAxes: function () {
  			var treeAxis = {
  				endOnTick: false,
  				gridLineWidth: 0,
  				lineWidth: 0,
  				min: 0,
  				dataMin: 0,
  				minPadding: 0,
  				max: 100,
  				dataMax: 100,
  				maxPadding: 0,
  				startOnTick: false,
  				title: null,
  				tickPositions: []
  			};
  			Series.prototype.bindAxes.call(this);
  			H.extend(this.yAxis.options, treeAxis);
  			H.extend(this.xAxis.options, treeAxis);
  		}
  	}));
  }));
  