Subversion-Projekte lars-tiefland.cienc

/**

 * jqPlot

 * Pure JavaScript plotting plugin using jQuery

 *

 * Version: 1.0.8

 * Revision: 1250

 *

 * Copyright (c) 2009-2013 Chris Leonello

 * jqPlot is currently available for use in all personal or commercial projects

 * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL

 * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can

 * choose the license that best suits your project and use it accordingly.

 *

 * Although not required, the author would appreciate an email letting him

 * know of any substantial use of jqPlot.  You can reach the author at:

 * chris at jqplot dot com or see http://www.jqplot.com/info.php .

 *

 * If you are feeling kind and generous, consider supporting the project by

 * making a donation at: http://www.jqplot.com/donate.php .

 *

 * sprintf functions contained in jqplot.sprintf.js by Ash Searle:

 *

 *     version 2007.04.27

 *     author Ash Searle

 *     http://hexmen.com/blog/2007/03/printf-sprintf/

 *     http://hexmen.com/js/sprintf.js

 *     The author (Ash Searle) has placed this code in the public domain:

 *     "This code is unrestricted: you are free to use it however you like."

 *

 */

(function($) {

    // Class: $.jqplot.BarRenderer

    // A plugin renderer for jqPlot to draw a bar plot.

    // Draws series as a line.

    $.jqplot.BarRenderer = function(){

        $.jqplot.LineRenderer.call(this);

    };

    $.jqplot.BarRenderer.prototype = new $.jqplot.LineRenderer();

    $.jqplot.BarRenderer.prototype.constructor = $.jqplot.BarRenderer;

    // called with scope of series.

    $.jqplot.BarRenderer.prototype.init = function(options, plot) {

        // Group: Properties

        //

        // prop: barPadding

        // Number of pixels between adjacent bars at the same axis value.

        this.barPadding = 8;

        // prop: barMargin

        // Number of pixels between groups of bars at adjacent axis values.

        this.barMargin = 10;

        // prop: barDirection

        // 'vertical' = up and down bars, 'horizontal' = side to side bars

        this.barDirection = 'vertical';

        // prop: barWidth

        // Width of the bar in pixels (auto by devaul).  null = calculated automatically.

        this.barWidth = null;

        // prop: shadowOffset

        // offset of the shadow from the slice and offset of

        // each succesive stroke of the shadow from the last.

        this.shadowOffset = 2;

        // prop: shadowDepth

        // number of strokes to apply to the shadow,

        // each stroke offset shadowOffset from the last.

        this.shadowDepth = 5;

        // prop: shadowAlpha

        // transparency of the shadow (0 = transparent, 1 = opaque)

        this.shadowAlpha = 0.08;

        // prop: waterfall

        // true to enable waterfall plot.

        this.waterfall = false;

        // prop: groups

        // group bars into this many groups

        this.groups = 1;

        // prop: varyBarColor

        // true to color each bar of a series separately rather than

        // have every bar of a given series the same color.

        // If used for non-stacked multiple series bar plots, user should

        // specify a separate 'seriesColors' array for each series.

        // Otherwise, each series will set their bars to the same color array.

        // This option has no Effect for stacked bar charts and is disabled.

        this.varyBarColor = false;

        // prop: highlightMouseOver

        // True to highlight slice when moused over.

        // This must be false to enable highlightMouseDown to highlight when clicking on a slice.

        this.highlightMouseOver = true;

        // prop: highlightMouseDown

        // True to highlight when a mouse button is pressed over a slice.

        // This will be disabled if highlightMouseOver is true.

        this.highlightMouseDown = false;

        // prop: highlightColors

        // an array of colors to use when highlighting a bar.

        this.highlightColors = [];

        // prop: transposedData

        // NOT IMPLEMENTED YET.  True if this is a horizontal bar plot and

        // x and y values are "transposed".  Tranposed, or "swapped", data is

        // required prior to rev. 894 builds of jqPlot with horizontal bars.

        // Allows backward compatability of bar renderer horizontal bars with

        // old style data sets.

        this.transposedData = true;

        this.renderer.animation = {

            show: false,

            direction: 'down',

            speed: 3000,

            _supported: true

        };

        this._type = 'bar';

        // if user has passed in highlightMouseDown option and not set highlightMouseOver, disable highlightMouseOver

        if (options.highlightMouseDown && options.highlightMouseOver == null) {

            options.highlightMouseOver = false;

        }

        //////

        // This is probably wrong here.

        // After going back and forth on whether renderer should be the thing

        // or extend the thing, it seems that it it best if it is a property

        // on the thing.  This should be something that is commonized

        // among series renderers in the future.

        //////

        $.extend(true, this, options);

        // really should probably do this

        $.extend(true, this.renderer, options);

        // fill is still needed to properly draw the legend.

        // bars have to be filled.

        this.fill = true;

        // if horizontal bar and animating, reset the default direction

        if (this.barDirection === 'horizontal' && this.rendererOptions.animation && this.rendererOptions.animation.direction == null) {

            this.renderer.animation.direction = 'left';

        }

        if (this.waterfall) {

            this.fillToZero = false;

            this.disableStack = true;

        }

        if (this.barDirection == 'vertical' ) {

            this._primaryAxis = '_xaxis';

            this._stackAxis = 'y';

            this.fillAxis = 'y';

        }

        else {

            this._primaryAxis = '_yaxis';

            this._stackAxis = 'x';

            this.fillAxis = 'x';

        }

        // index of the currenty highlighted point, if any

        this._highlightedPoint = null;

        // total number of values for all bar series, total number of bar series, and position of this series

        this._plotSeriesInfo = null;

        // Array of actual data colors used for each data point.

        this._dataColors = [];

        this._barPoints = [];

        // set the shape renderer options

        var opts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, strokeStyle:this.color, fillStyle:this.color, closePath:this.fill};

        this.renderer.shapeRenderer.init(opts);

        // set the shadow renderer options

        var sopts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, angle:this.shadowAngle, offset:this.shadowOffset, alpha:this.shadowAlpha, depth:this.shadowDepth, closePath:this.fill};

        this.renderer.shadowRenderer.init(sopts);

        plot.postInitHooks.addOnce(postInit);

        plot.postDrawHooks.addOnce(postPlotDraw);

        plot.eventListenerHooks.addOnce('jqplotMouseMove', handleMove);

        plot.eventListenerHooks.addOnce('jqplotMouseDown', handleMouseDown);

        plot.eventListenerHooks.addOnce('jqplotMouseUp', handleMouseUp);

        plot.eventListenerHooks.addOnce('jqplotClick', handleClick);

        plot.eventListenerHooks.addOnce('jqplotRightClick', handleRightClick);

    };

    // called with scope of series

    function barPreInit(target, data, seriesDefaults, options) {

        if (this.rendererOptions.barDirection == 'horizontal') {

            this._stackAxis = 'x';

            this._primaryAxis = '_yaxis';

        }

        if (this.rendererOptions.waterfall == true) {

            this._data = $.extend(true, [], this.data);

            var sum = 0;

            var pos = (!this.rendererOptions.barDirection || this.rendererOptions.barDirection === 'vertical' || this.transposedData === false) ? 1 : 0;

            for(var i=0; i<this.data.length; i++) {

                sum += this.data[i][pos];

                if (i>0) {

                    this.data[i][pos] += this.data[i-1][pos];

                }

            }

            this.data[this.data.length] = (pos == 1) ? [this.data.length+1, sum] : [sum, this.data.length+1];

            this._data[this._data.length] = (pos == 1) ? [this._data.length+1, sum] : [sum, this._data.length+1];

        }

        if (this.rendererOptions.groups > 1) {

            this.breakOnNull = true;

            var l = this.data.length;

            var skip = parseInt(l/this.rendererOptions.groups, 10);

            var count = 0;

            for (var i=skip; i<l; i+=skip) {

                this.data.splice(i+count, 0, [null, null]);

                this._plotData.splice(i+count, 0, [null, null]);

                this._stackData.splice(i+count, 0, [null, null]);

                count++;

            }

            for (i=0; i<this.data.length; i++) {

                if (this._primaryAxis == '_xaxis') {

                    this.data[i][0] = i+1;

                    this._plotData[i][0] = i+1;

                    this._stackData[i][0] = i+1;

                }

                else {

                    this.data[i][1] = i+1;

                    this._plotData[i][1] = i+1;

                    this._stackData[i][1] = i+1;

                }

            }

        }

    }

    $.jqplot.preSeriesInitHooks.push(barPreInit);

    // needs to be called with scope of series, not renderer.

    $.jqplot.BarRenderer.prototype.calcSeriesNumbers = function() {

        var nvals = 0;

        var nseries = 0;

        var paxis = this[this._primaryAxis];

        var s, series, pos;

        // loop through all series on this axis

        for (var i=0; i < paxis._series.length; i++) {

            series = paxis._series[i];

            if (series === this) {

                pos = i;

            }

            // is the series rendered as a bar?

            if (series.renderer.constructor == $.jqplot.BarRenderer) {

                // gridData may not be computed yet, use data length insted

                nvals += series.data.length;

                nseries += 1;

            }

        }

        // return total number of values for all bar series, total number of bar series, and position of this series

        return [nvals, nseries, pos];

    };

    $.jqplot.BarRenderer.prototype.setBarWidth = function() {

        // need to know how many data values we have on the approprate axis and figure it out.

        var i;

        var nvals = 0;

        var nseries = 0;

        var paxis = this[this._primaryAxis];

        var s, series, pos;

        var temp = this._plotSeriesInfo = this.renderer.calcSeriesNumbers.call(this);

        nvals = temp[0];

        nseries = temp[1];

        var nticks = paxis.numberTicks;

        var nbins = (nticks-1)/2;

        // so, now we have total number of axis values.

        if (paxis.name == 'xaxis' || paxis.name == 'x2axis') {

            if (this._stack) {

                this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals * nseries - this.barMargin;

            }

            else {

                this.barWidth = ((paxis._offsets.max - paxis._offsets.min)/nbins  - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;

                // this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals - this.barPadding - this.barMargin/nseries;

            }

        }

        else {

            if (this._stack) {

                this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals * nseries - this.barMargin;

            }

            else {

                this.barWidth = ((paxis._offsets.min - paxis._offsets.max)/nbins  - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;

                // this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals - this.barPadding - this.barMargin/nseries;

            }

        }

        return [nvals, nseries];

    };

    function computeHighlightColors (colors) {

        var ret = [];

        for (var i=0; i<colors.length; i++){

            var rgba = $.jqplot.getColorComponents(colors[i]);

            var newrgb = [rgba[0], rgba[1], rgba[2]];

            var sum = newrgb[0] + newrgb[1] + newrgb[2];

            for (var j=0; j<3; j++) {

                // when darkening, lowest color component can be is 60.

                newrgb[j] = (sum > 570) ?  newrgb[j] * 0.8 : newrgb[j] + 0.3 * (255 - newrgb[j]);

                newrgb[j] = parseInt(newrgb[j], 10);

            }

            ret.push('rgb('+newrgb[0]+','+newrgb[1]+','+newrgb[2]+')');

        }

        return ret;

    }

    function getStart(sidx, didx, comp, plot, axis) {

        // check if sign change

        var seriesIndex = sidx,

            prevSeriesIndex = sidx - 1,

            start,

            prevVal,

            aidx = (axis === 'x') ? 0 : 1;

        // is this not the first series?

        if (seriesIndex > 0) {

            prevVal = plot.series[prevSeriesIndex]._plotData[didx][aidx];

            // is there a sign change

            if ((comp * prevVal) < 0) {

                start = getStart(prevSeriesIndex, didx, comp, plot, axis);

            }

            // no sign change.

            else {

                start = plot.series[prevSeriesIndex].gridData[didx][aidx];

            }

        }

        // if first series, return value at 0

        else {

            start = (aidx === 0) ? plot.series[seriesIndex]._xaxis.series_u2p(0) : plot.series[seriesIndex]._yaxis.series_u2p(0);

        }

        return start;

    }

    $.jqplot.BarRenderer.prototype.draw = function(ctx, gridData, options, plot) {

        var i;

        // Ughhh, have to make a copy of options b/c it may be modified later.

        var opts = $.extend({}, options);

        var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;

        var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;

        var fill = (opts.fill != undefined) ? opts.fill : this.fill;

        var xaxis = this.xaxis;

        var yaxis = this.yaxis;

        var xp = this._xaxis.series_u2p;

        var yp = this._yaxis.series_u2p;

        var pointx, pointy;

        // clear out data colors.

        this._dataColors = [];

        this._barPoints = [];

        if (this.barWidth == null) {

            this.renderer.setBarWidth.call(this);

        }

        var temp = this._plotSeriesInfo = this.renderer.calcSeriesNumbers.call(this);

        var nvals = temp[0];

        var nseries = temp[1];

        var pos = temp[2];

        var points = [];

        if (this._stack) {

            this._barNudge = 0;

        }

        else {

            this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);

        }

        if (showLine) {

            var negativeColors = new $.jqplot.ColorGenerator(this.negativeSeriesColors);

            var positiveColors = new $.jqplot.ColorGenerator(this.seriesColors);

            var negativeColor = negativeColors.get(this.index);

            if (! this.useNegativeColors) {

                negativeColor = opts.fillStyle;

            }

            var positiveColor = opts.fillStyle;

            var base;

            var xstart;

            var ystart;

            if (this.barDirection == 'vertical') {

                for (var i=0; i<gridData.length; i++) {

                    if (!this._stack && this.data[i][1] == null) {

                        continue;

                    }

                    points = [];

                    base = gridData[i][0] + this._barNudge;

                    // stacked

                    if (this._stack && this._prevGridData.length) {

                        ystart = getStart(this.index, i, this._plotData[i][1], plot, 'y');

                    }

                    // not stacked

                    else {

                        if (this.fillToZero) {

                            ystart = this._yaxis.series_u2p(0);

                        }

                        else if (this.waterfall && i > 0 && i < this.gridData.length-1) {

                            ystart = this.gridData[i-1][1];

                        }

                        else if (this.waterfall && i == 0 && i < this.gridData.length-1) {

                            if (this._yaxis.min <= 0 && this._yaxis.max >= 0) {

                                ystart = this._yaxis.series_u2p(0);

                            }

                            else if (this._yaxis.min > 0) {

                                ystart = ctx.canvas.height;

                            }

                            else {

                                ystart = 0;

                            }

                        }

                        else if (this.waterfall && i == this.gridData.length - 1) {

                            if (this._yaxis.min <= 0 && this._yaxis.max >= 0) {

                                ystart = this._yaxis.series_u2p(0);

                            }

                            else if (this._yaxis.min > 0) {

                                ystart = ctx.canvas.height;

                            }

                            else {

                                ystart = 0;

                            }

                        }

                        else {

                            ystart = ctx.canvas.height;

                        }

                    }

                    if ((this.fillToZero && this._plotData[i][1] < 0) || (this.waterfall && this._data[i][1] < 0)) {

                        if (this.varyBarColor && !this._stack) {

                            if (this.useNegativeColors) {

                                opts.fillStyle = negativeColors.next();

                            }

                            else {

                                opts.fillStyle = positiveColors.next();

                            }

                        }

                        else {

                            opts.fillStyle = negativeColor;

                        }

                    }

                    else {

                        if (this.varyBarColor && !this._stack) {

                            opts.fillStyle = positiveColors.next();

                        }

                        else {

                            opts.fillStyle = positiveColor;

                        }

                    }

                    if (!this.fillToZero || this._plotData[i][1] >= 0) {

                        points.push([base-this.barWidth/2, ystart]);

                        points.push([base-this.barWidth/2, gridData[i][1]]);

                        points.push([base+this.barWidth/2, gridData[i][1]]);

                        points.push([base+this.barWidth/2, ystart]);

                    }

                    // for negative bars make sure points are always ordered clockwise

                    else {

                        points.push([base-this.barWidth/2, gridData[i][1]]);

                        points.push([base-this.barWidth/2, ystart]);

                        points.push([base+this.barWidth/2, ystart]);

                        points.push([base+this.barWidth/2, gridData[i][1]]);

                    }

                    this._barPoints.push(points);

                    // now draw the shadows if not stacked.

                    // for stacked plots, they are predrawn by drawShadow

                    if (shadow && !this._stack) {

                        var sopts = $.extend(true, {}, opts);

                        // need to get rid of fillStyle on shadow.

                        delete sopts.fillStyle;

                        this.renderer.shadowRenderer.draw(ctx, points, sopts);

                    }

                    var clr = opts.fillStyle || this.color;

                    this._dataColors.push(clr);

                    this.renderer.shapeRenderer.draw(ctx, points, opts);

                }

            }

            else if (this.barDirection == 'horizontal'){

                for (var i=0; i<gridData.length; i++) {

                    if (!this._stack && this.data[i][0] == null) {

                        continue;

                    }

                    points = [];

                    base = gridData[i][1] - this._barNudge;

                    xstart;

                    if (this._stack && this._prevGridData.length) {

                        xstart = getStart(this.index, i, this._plotData[i][0], plot, 'x');

                    }

                    // not stacked

                    else {

                        if (this.fillToZero) {

                            xstart = this._xaxis.series_u2p(0);

                        }

                        else if (this.waterfall && i > 0 && i < this.gridData.length-1) {

                            xstart = this.gridData[i-1][0];

                        }

                        else if (this.waterfall && i == 0 && i < this.gridData.length-1) {

                            if (this._xaxis.min <= 0 && this._xaxis.max >= 0) {

                                xstart = this._xaxis.series_u2p(0);

                            }

                            else if (this._xaxis.min > 0) {

                                xstart = 0;

                            }

                            else {

                                xstart = 0;

                            }

                        }

                        else if (this.waterfall && i == this.gridData.length - 1) {

                            if (this._xaxis.min <= 0 && this._xaxis.max >= 0) {

                                xstart = this._xaxis.series_u2p(0);

                            }

                            else if (this._xaxis.min > 0) {

                                xstart = 0;

                            }

                            else {

                                xstart = ctx.canvas.width;

                            }

                        }

                        else {

                            xstart = 0;

                        }

                    }

                    if ((this.fillToZero && this._plotData[i][0] < 0) || (this.waterfall && this._data[i][0] < 0)) {

                        if (this.varyBarColor && !this._stack) {

                            if (this.useNegativeColors) {

                                opts.fillStyle = negativeColors.next();

                            }

                            else {

                                opts.fillStyle = positiveColors.next();

                            }

                        }

                        else {

                            opts.fillStyle = negativeColor;

                        }

                    }

                    else {

                        if (this.varyBarColor && !this._stack) {

                            opts.fillStyle = positiveColors.next();

                        }

                        else {

                            opts.fillStyle = positiveColor;

                        }

                    }

                    if (!this.fillToZero || this._plotData[i][0] >= 0) {

                        points.push([xstart, base + this.barWidth / 2]);

                        points.push([xstart, base - this.barWidth / 2]);

                        points.push([gridData[i][0], base - this.barWidth / 2]);

                        points.push([gridData[i][0], base + this.barWidth / 2]);

                    }

                    else {

                        points.push([gridData[i][0], base + this.barWidth / 2]);

                        points.push([gridData[i][0], base - this.barWidth / 2]);

                        points.push([xstart, base - this.barWidth / 2]);

                        points.push([xstart, base + this.barWidth / 2]);

                    }

                    this._barPoints.push(points);

                    // now draw the shadows if not stacked.

                    // for stacked plots, they are predrawn by drawShadow

                    if (shadow && !this._stack) {

                        var sopts = $.extend(true, {}, opts);

                        delete sopts.fillStyle;

                        this.renderer.shadowRenderer.draw(ctx, points, sopts);

                    }

                    var clr = opts.fillStyle || this.color;

                    this._dataColors.push(clr);

                    this.renderer.shapeRenderer.draw(ctx, points, opts);

                }

            }

        }

        if (this.highlightColors.length == 0) {

            this.highlightColors = $.jqplot.computeHighlightColors(this._dataColors);

        }

        else if (typeof(this.highlightColors) == 'string') {

            var temp = this.highlightColors;

            this.highlightColors = [];

            for (var i=0; i<this._dataColors.length; i++) {

                this.highlightColors.push(temp);

            }

        }

    };

    // for stacked plots, shadows will be pre drawn by drawShadow.

    $.jqplot.BarRenderer.prototype.drawShadow = function(ctx, gridData, options, plot) {

        var i;

        var opts = (options != undefined) ? options : {};

        var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;

        var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;

        var fill = (opts.fill != undefined) ? opts.fill : this.fill;

        var xaxis = this.xaxis;

        var yaxis = this.yaxis;

        var xp = this._xaxis.series_u2p;

        var yp = this._yaxis.series_u2p;

        var pointx, points, pointy, nvals, nseries, pos;

        if (this._stack && this.shadow) {

            if (this.barWidth == null) {

                this.renderer.setBarWidth.call(this);

            }

            var temp = this._plotSeriesInfo = this.renderer.calcSeriesNumbers.call(this);

            nvals = temp[0];

            nseries = temp[1];

            pos = temp[2];

            if (this._stack) {

                this._barNudge = 0;

            }

            else {

                this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);

            }

            if (showLine) {

                if (this.barDirection == 'vertical') {

                    for (var i=0; i<gridData.length; i++) {

                        if (this.data[i][1] == null) {

                            continue;

                        }

                        points = [];

                        var base = gridData[i][0] + this._barNudge;

                        var ystart;

                        if (this._stack && this._prevGridData.length) {

                            ystart = getStart(this.index, i, this._plotData[i][1], plot, 'y');

                        }

                        else {

                            if (this.fillToZero) {

                                ystart = this._yaxis.series_u2p(0);

                            }

                            else {

                                ystart = ctx.canvas.height;

                            }

                        }

                        points.push([base-this.barWidth/2, ystart]);

                        points.push([base-this.barWidth/2, gridData[i][1]]);

                        points.push([base+this.barWidth/2, gridData[i][1]]);

                        points.push([base+this.barWidth/2, ystart]);

                        this.renderer.shadowRenderer.draw(ctx, points, opts);

                    }

                }

                else if (this.barDirection == 'horizontal'){

                    for (var i=0; i<gridData.length; i++) {

                        if (this.data[i][0] == null) {

                            continue;

                        }

                        points = [];

                        var base = gridData[i][1] - this._barNudge;

                        var xstart;

                        if (this._stack && this._prevGridData.length) {

                            xstart = getStart(this.index, i, this._plotData[i][0], plot, 'x');

                        }

                        else {

                            if (this.fillToZero) {

                                xstart = this._xaxis.series_u2p(0);

                            }

                            else {

                                xstart = 0;

                            }

                        }

                        points.push([xstart, base+this.barWidth/2]);

                        points.push([gridData[i][0], base+this.barWidth/2]);

                        points.push([gridData[i][0], base-this.barWidth/2]);

                        points.push([xstart, base-this.barWidth/2]);

                        this.renderer.shadowRenderer.draw(ctx, points, opts);

                    }

                }

            }

        }

    };

    function postInit(target, data, options) {

        for (var i=0; i<this.series.length; i++) {

            if (this.series[i].renderer.constructor == $.jqplot.BarRenderer) {

                // don't allow mouseover and mousedown at same time.

                if (this.series[i].highlightMouseOver) {

                    this.series[i].highlightMouseDown = false;

                }

            }

        }

    }

    // called within context of plot

    // create a canvas which we can draw on.

    // insert it before the eventCanvas, so eventCanvas will still capture events.

    function postPlotDraw() {

        // Memory Leaks patch

        if (this.plugins.barRenderer && this.plugins.barRenderer.highlightCanvas) {

            this.plugins.barRenderer.highlightCanvas.resetCanvas();

            this.plugins.barRenderer.highlightCanvas = null;

        }

        this.plugins.barRenderer = {highlightedSeriesIndex:null};

        this.plugins.barRenderer.highlightCanvas = new $.jqplot.GenericCanvas();

        this.eventCanvas._elem.before(this.plugins.barRenderer.highlightCanvas.createElement(this._gridPadding, 'jqplot-barRenderer-highlight-canvas', this._plotDimensions, this));

        this.plugins.barRenderer.highlightCanvas.setContext();

        this.eventCanvas._elem.bind('mouseleave', {plot:this}, function (ev) { unhighlight(ev.data.plot); });

    }

    function highlight (plot, sidx, pidx, points) {

        var s = plot.series[sidx];

        var canvas = plot.plugins.barRenderer.highlightCanvas;

        canvas._ctx.clearRect(0,0,canvas._ctx.canvas.width, canvas._ctx.canvas.height);

        s._highlightedPoint = pidx;

        plot.plugins.barRenderer.highlightedSeriesIndex = sidx;

        var opts = {fillStyle: s.highlightColors[pidx]};

        s.renderer.shapeRenderer.draw(canvas._ctx, points, opts);

        canvas = null;

    }

    function unhighlight (plot) {

        var canvas = plot.plugins.barRenderer.highlightCanvas;

        canvas._ctx.clearRect(0,0, canvas._ctx.canvas.width, canvas._ctx.canvas.height);

        for (var i=0; i<plot.series.length; i++) {

            plot.series[i]._highlightedPoint = null;

        }

        plot.plugins.barRenderer.highlightedSeriesIndex = null;

        plot.target.trigger('jqplotDataUnhighlight');

        canvas =  null;

    }

    function handleMove(ev, gridpos, datapos, neighbor, plot) {

        if (neighbor) {

            var ins = [neighbor.seriesIndex, neighbor.pointIndex, neighbor.data];

            var evt1 = jQuery.Event('jqplotDataMouseOver');

            evt1.pageX = ev.pageX;

            evt1.pageY = ev.pageY;

            plot.target.trigger(evt1, ins);

            if (plot.series[ins[0]].show && plot.series[ins[0]].highlightMouseOver &&

                !(ins[0] == plot.plugins.barRenderer.highlightedSeriesIndex && ins[1] == plot.series[ins[0]]._highlightedPoint)) {

                var evt = jQuery.Event('jqplotDataHighlight');

                evt.which = ev.which;

                evt.pageX = ev.pageX;

                evt.pageY = ev.pageY;

                plot.target.trigger(evt, ins);

                highlight (plot, neighbor.seriesIndex, neighbor.pointIndex, neighbor.points);

            }

        }

        else if (neighbor == null) {

            unhighlight (plot);

        }

    }

    function handleMouseDown(ev, gridpos, datapos, neighbor, plot) {

        if (neighbor) {

            var ins = [neighbor.seriesIndex, neighbor.pointIndex, neighbor.data];

            if (plot.series[ins[0]].highlightMouseDown && !(ins[0] == plot.plugins.barRenderer.highlightedSeriesIndex && ins[1] == plot.series[ins[0]]._highlightedPoint)) {

                var evt = jQuery.Event('jqplotDataHighlight');

                evt.which = ev.which;

                evt.pageX = ev.pageX;

                evt.pageY = ev.pageY;

                plot.target.trigger(evt, ins);

                highlight (plot, neighbor.seriesIndex, neighbor.pointIndex, neighbor.points);

            }

        }

        else if (neighbor == null) {

            unhighlight (plot);

        }

    }

    function handleMouseUp(ev, gridpos, datapos, neighbor, plot) {

        var idx = plot.plugins.barRenderer.highlightedSeriesIndex;

        if (idx != null && plot.series[idx].highlightMouseDown) {

            unhighlight(plot);

        }

    }

    function handleClick(ev, gridpos, datapos, neighbor, plot) {

        if (neighbor) {

            var ins = [neighbor.seriesIndex, neighbor.pointIndex, neighbor.data];

            var evt = jQuery.Event('jqplotDataClick');

            evt.which = ev.which;

            evt.pageX = ev.pageX;

            evt.pageY = ev.pageY;

            plot.target.trigger(evt, ins);

        }

    }

    function handleRightClick(ev, gridpos, datapos, neighbor, plot) {

        if (neighbor) {

            var ins = [neighbor.seriesIndex, neighbor.pointIndex, neighbor.data];

            var idx = plot.plugins.barRenderer.highlightedSeriesIndex;

            if (idx != null && plot.series[idx].highlightMouseDown) {

                unhighlight(plot);

            }

            var evt = jQuery.Event('jqplotDataRightClick');

            evt.which = ev.which;

            evt.pageX = ev.pageX;

            evt.pageY = ev.pageY;

            plot.target.trigger(evt, ins);

        }

    }

})(jQuery);