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/**
 * @license Highstock JS v2.1.8 (2015-08-20)
 *
 * (c) 2014 Highsoft AS
 * Authors: Jon Arild Nygard / Oystein Moseng
 *
 * License: www.highcharts.com/license
 */

/*global HighchartsAdapter */
(function (H) {
        var seriesTypes = H.seriesTypes,
                merge = H.merge,
                extend = H.extend,
                extendClass = H.extendClass,
                defaultOptions = H.getOptions(),
                plotOptions = defaultOptions.plotOptions,
                noop = function () { return; },
                each = H.each,
                grep = HighchartsAdapter.grep,
                pick = H.pick,
                Series = H.Series,
                Color = H.Color;

        // 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.node.val}</b><br/>'
                },
                layoutAlgorithm: 'sliceAndDice',
                layoutStartingDirection: 'vertical',
                alternateStartingDirection: false,
                levelIsConstant: true,
                states: {
                        hover: {
                                borderColor: '#A0A0A0',
                                brightness: seriesTypes.heatmap ? 0 : 0.1,
                                shadow: false
                        }
                },
                drillUpButton: {
                        position: { 
                                align: 'left',
                                x: 10,
                                y: -50
                        }
                }
        });
        
        // Stolen from heatmap  
        var colorSeriesMixin = {
                // mapping between SVG attributes and the corresponding options
                pointAttrToOptions: { 
                        stroke: 'borderColor',
                        'stroke-width': 'borderWidth',
                        fill: 'color',
                        dashstyle: 'borderDashStyle'
                },
                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, {
                        setState: function (state, move) {
                                H.Point.prototype.setState.call(this, state, move);
                                if (state === 'hover') {
                                        if (this.dataLabel) {
                                                this.dataLabel.attr({ zIndex: 1002 });
                                        }
                                } else {
                                        if (this.dataLabel) {
                                                this.dataLabel.attr({ zIndex: (this.pointAttr[''].zIndex + 1) });
                                        }
                                }
                        },
                        setVisible: seriesTypes.pie.prototype.pointClass.prototype.setVisible
                }),
                // @todo Move to translate
                handleLayout: function () {
                        var tree = this.tree,
                                seriesArea;
                        if (this.points.length) {
                                // Assign variables
                                this.rootNode = pick(this.rootNode, "");
                                tree = this.tree = this.getTree();
                                this.levelMap = this.getLevels();
                                seriesArea = this.getSeriesArea(tree.val);
                                this.calculateChildrenAreas(tree, seriesArea);
                                this.setPointValues();
                        }
                },
                /**
                * Creates a tree structured object from the series points
                */
                getTree: function () {
                        var tree,
                                series = this,
                                parentList = [],
                                allIds = [],
                                key,
                                insertItem = function (key) {
                                        each(parentList[key], function (item) {
                                                parentList[""].push(item);
                                        });
                                };
                        // Actions
                        this.nodeMap = [];

                        // Map children to index
                        // @todo Use data instead of points
                        each(this.points, function (point, index) {
                                var parent = "";
                                allIds.push(point.id);
                                if (point.parent !== undefined) {
                                        parent = point.parent;
                                }
                                if (parentList[parent] === undefined) {
                                        parentList[parent] = [];
                                }
                                parentList[parent].push(index);
                        });
                        /* 
                        *  Quality check:
                        *  - If parent does not exist, then set parent to tree root
                        *  - Add node id to parents children list
                        */  
                        for (key in parentList) {
                                if ((parentList.hasOwnProperty(key)) && (key !== "") && (HighchartsAdapter.inArray(key, allIds) === -1)) {
                                        insertItem(key);
                                        delete parentList[key];
                                }
                        }
                        tree = series.buildNode("", -1, 0, parentList, null);
                        this.eachParents(this.nodeMap[this.rootNode], function (node) {
                                node.visible = true;
                        });
                        this.eachChildren(this.nodeMap[this.rootNode], function (node) {
                                node.visible = true;
                        });
                        this.setTreeValues(tree);
                        return tree;
                },
                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,
                                childrenTotal = 0,
                                sorted = [],
                                val,
                                point = series.points[tree.i];

                        // First give the children some values
                        each(tree.children, function (child) {
                                child = series.setTreeValues(child);
                                series.insertElementSorted(sorted, child, function (el, el2) {
                                        return el.val > el2.val; 
                                });

                                if (!child.ignore) {
                                        childrenTotal += child.val;
                                } else {
                                        // @todo Add predicate to avoid looping already ignored children
                                        series.eachChildren(child, function (node) {
                                                extend(node, {
                                                        ignore: true,
                                                        isLeaf: false,
                                                        visible: false
                                                });
                                        });
                                }
                        });

                        // Set the values
                        val = pick(point && point.value, childrenTotal);
                        extend(tree, {
                                children: sorted,
                                childrenTotal: childrenTotal,
                                // Ignore this node if point is not visible
                                ignore: !(pick(point && point.visible, true) && (val > 0)),
                                isLeaf: tree.visible && !childrenTotal,
                                name: pick(point && point.name, ""),
                                val: val
                        });
                        return tree;
                },
                eachChildren: function (node, callback) {
                        var series = this,
                                children = node.children;
                        callback(node);
                        if (children.length) {
                                each(children, function (child) {
                                        series.eachChildren(child, callback);
                                });
                        }
                },
                eachParents: function (node, callback) {
                        var parent = this.nodeMap[node.parent];
                        callback(node);
                        if (parent) {
                                this.eachParents(parent, callback);
                        }
                },
                /**
                 * 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,
                                levelNumber = (options.levelIsConstant ? parent.level : (parent.level - this.nodeMap[this.rootNode].level)),
                                level = this.levelMap[levelNumber + 1],
                                algorithm = pick((series[level && level.layoutAlgorithm] && level.layoutAlgorithm), options.layoutAlgorithm),
                                alternate = options.alternateStartingDirection,
                                childrenValues = [],
                                children,
                                point;

                        // 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) {
                                point = series.points[child.i];
                                point.level = levelNumber + 1;
                                child.values = merge(childrenValues[index], {
                                        val: child.childrenTotal,
                                        direction: (alternate ? 1 - area.direction : area.direction)
                                });
                                // 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;
                        series.nodeMap[""].values = {
                                x: 0,
                                y: 0,
                                width: 100,
                                height: 100
                        };
                        each(series.points, function (point) {
                                var node = point.node,
                                        values = node.values,
                                        x1,
                                        x2,
                                        y1,
                                        y2;
                                // Points which is ignored, have no values.
                                if (values) {
                                        values.x = values.x / series.axisRatio;
                                        values.width = values.width / series.axisRatio;
                                        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;
                                }
                        });
                },
                getSeriesArea: function (val) {
                        var x = 0,
                                y = 0,
                                h = 100,
                                r = this.axisRatio = (this.xAxis.len / this.yAxis.len),
                                w = 100 * r,
                                d = this.options.layoutStartingDirection === 'vertical' ? 0 : 1,
                                seriesArea = {
                                        x: x,
                                        y: y,
                                        width: w,
                                        height: h,
                                        direction: d,
                                        val: val
                                };
                                this.nodeMap[""].values = seriesArea;
                        return seriesArea;
                },
                getLevels: function () {
                        var map = [],
                                levels = this.options.levels;
                        if (levels) {
                                each(levels, function (level) {
                                        if (level.level !== undefined) {
                                                map[level.level] = level;
                                        }
                                });
                        }
                        return map;
                },
                setColorRecursive: function (node, color) {
                        var series = this,
                                point,
                                level;
                        if (node) {
                                point = series.points[node.i];
                                level = series.levelMap[node.level];
                                // 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);
                                        });
                                }
                        }
                },
                alg_func_group: 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;
                        };
                },
                alg_func_calcPoints: 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);
                        }
                },
                alg_func_lowAspectRatio: 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.alg_func_group(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.alg_func_calcPoints(directionChange, false, group, childrenArea, plot);
                                }
                                // If last child, then calculate all remaining areas
                                if (i === end) {
                                        series.alg_func_calcPoints(directionChange, true, group, childrenArea, plot);
                                }
                                i = i + 1;
                        });
                        return childrenArea;
                },
                alg_func_fill: 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.alg_func_lowAspectRatio(false, parent, children);
                },
                squarified: function (parent, children) {
                        return this.alg_func_lowAspectRatio(true, parent, children);
                },
                sliceAndDice: function (parent, children) {
                        return this.alg_func_fill(true, parent, children);
                },
                stripes: function (parent, children) {
                        return this.alg_func_fill(false, parent, children);
                },
                translate: function () {
                        // Call prototype function
                        Series.prototype.translate.call(this);
                        this.handleLayout();

                        // If a colorAxis is defined
                        if (this.colorAxis) {
                                this.translateColors();
                        } else if (!this.options.colorByPoint) {
                                this.setColorRecursive(this.tree, undefined);
                        }
                },
                /**
                 * 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,
                                dataLabelsGroup = series.dataLabelsGroup,
                                points = series.points,
                                options,
                                level;
                        each(points, function (point) {
                                level = series.levelMap[point.level];
                                // 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;
                                }

                                // Merge custom options with point options
                                point.dlOptions = merge(options, point.options.dataLabels);
                        });

                        this.dataLabelsGroup = this.group; // Draw dataLabels in same group as points, because of z-index on hover
                        Series.prototype.drawDataLabels.call(this);
                        this.dataLabelsGroup = dataLabelsGroup;
                },
                alignDataLabel: seriesTypes.column.prototype.alignDataLabel,
                /**
                * Extending ColumnSeries drawPoints
                */
                drawPoints: function () {
                        var series = this,
                                points = series.points,
                                seriesOptions = series.options,
                                attr,
                                hover,
                                level;
                        each(points, function (point) {
                                level = series.levelMap[point.level];
                                attr = {
                                        stroke: seriesOptions.borderColor,
                                        'stroke-width': seriesOptions.borderWidth,
                                        dashstyle: seriesOptions.borderDashStyle,
                                        r: 0, // borderRadius gives wrong size relations and should always be disabled
                                        fill: pick(point.color, series.color)
                                };
                                // Overwrite standard series options with level options                 
                                if (level) {
                                        attr.stroke = level.borderColor || attr.stroke;
                                        attr['stroke-width'] = level.borderWidth || attr['stroke-width'];
                                        attr.dashstyle = level.borderDashStyle || attr.dashstyle;
                                }
                                // Merge with point attributes
                                attr.stroke = point.borderColor || attr.stroke;
                                attr['stroke-width'] = point.borderWidth || attr['stroke-width'];
                                attr.dashstyle = point.borderDashStyle || attr.dashstyle;
                                attr.zIndex = (1000 - (point.level * 2));

                                // Make a copy to prevent overwriting individual props
                                point.pointAttr = merge(point.pointAttr);
                                hover = point.pointAttr.hover;
                                hover.zIndex = 1001;
                                hover.fill = Color(attr.fill).brighten(seriesOptions.states.hover.brightness).get();
                                // If not a leaf, then remove fill
                                if (!point.node.isLeaf) {
                                        if (pick(seriesOptions.interactByLeaf, !seriesOptions.allowDrillToNode)) {
                                                attr.fill = 'none';
                                                delete hover.fill;
                                        } else {
                                                // TODO: let users set the opacity
                                                attr.fill = Color(attr.fill).setOpacity(0.15).get();
                                                hover.fill = Color(hover.fill).setOpacity(0.75).get();
                                        }
                                }
                                if (point.node.level <= series.nodeMap[series.rootNode].level) {
                                        attr.fill = 'none';
                                        attr.zIndex = 0;
                                        delete hover.fill;
                                }
                                point.pointAttr[''] = H.extend(point.pointAttr[''], attr);
                                // @todo Move this to drawDataLabels
                                if (point.dataLabel) {
                                        point.dataLabel.attr({ zIndex: (point.pointAttr[''].zIndex + 1) });
                                }
                        });
                        // Call standard drawPoints
                        seriesTypes.column.prototype.drawPoints.call(this);

                        each(points, function (point) {
                                if (point.graphic) {
                                        point.graphic.attr(point.pointAttr['']);
                                }
                        });

                        // Set click events on points 
                        if (seriesOptions.allowDrillToNode) {
                                series.drillTo();
                        }
                },
                /**
                 * Inserts an element into an array, sorted by a condition.
                 * Modifies the referenced array
                 * @param {*[]} arr The array which the element is inserted into.
                 * @param {*} el The element to insert.
                 * @param {function} cond The condition to sort on. First parameter is el, second parameter is array element
                 */
                insertElementSorted: function (arr, el, cond) {
                        var i = 0,
                                inserted = false;
                        if (arr.length !== 0) {
                                each(arr, function (arrayElement) {
                                        if (cond(el, arrayElement) && !inserted) {
                                                arr.splice(i, 0, el);
                                                inserted = true;
                                        }
                                        i = i + 1;                                      
                                });
                        } 
                        if (!inserted) {
                                arr.push(el);
                        }
                },
                /**
                * Add drilling on the suitable points
                */
                drillTo: function () {
                        var series = this,
                                points = series.points;
                        each(points, function (point) {
                                var drillId,
                                        drillName;
                                H.removeEvent(point, 'click.drillTo');
                                if (point.graphic) {
                                        point.graphic.css({ cursor: 'default' });
                                }

                                // Get the drill to id
                                if (series.options.interactByLeaf) {
                                        drillId = series.drillToByLeaf(point);
                                } else {
                                        drillId = series.drillToByGroup(point);
                                }

                                // If a drill id is returned, add click event and cursor. 
                                if (drillId) {
                                        drillName = series.nodeMap[series.rootNode].name || series.rootNode;
                                        if (point.graphic) {
                                                point.graphic.css({ cursor: 'pointer' });
                                        }
                                        H.addEvent(point, 'click.drillTo', function () {
                                                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) {
                        var node = this.nodeMap[id],
                                val = node.values;
                        this.rootNode = id;
                        this.xAxis.setExtremes(val.x, val.x + val.width, false);
                        this.yAxis.setExtremes(val.y, val.y + val.height, false);
                        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);
                }
        }));
}(Highcharts));