chamilo-lms2/public/js/jqplot/plugins/jqplot.mekkoRenderer.js

/**
 * jqPlot
 * Pure JavaScript plotting plugin using jQuery
 *
 * Version: @VERSION
 * Revision: @REVISION
 *
 * 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: $.jqplot.MekkoRenderer
     * Draws a Mekko style chart which shows 3 dimensional data on a 2 dimensional graph.
     * the <$.jqplot.MekkoAxisRenderer> should be used with mekko charts.  The mekko renderer
     * overrides the default legend renderer with its own $.jqplot.MekkoLegendRenderer
     * which allows more flexibility to specify number of rows and columns in the legend.
     * 
     * Data is specified per bar in the chart.  You can specify data as an array of y values, or as 
     * an array of [label, value] pairs.  Note that labels are used only on the first series.  
     * Labels on subsequent series are ignored:
     * 
     * > bar1 = [['shirts', 8],['hats', 14],['shoes', 6],['gloves', 16],['dolls', 12]];
     * > bar2 = [15,6,9,13,6];
     * > bar3 = [['grumpy',4],['sneezy',2],['happy',7],['sleepy',9],['doc',7]];
     * 
     * If you want to place labels for each bar under the axis, you use the barLabels option on 
     * the axes.  The bar labels can be styled with the ".jqplot-mekko-barLabel" css class.
     * 
     * > barLabels = ['Mickey Mouse', 'Donald Duck', 'Goofy'];
     * > axes:{xaxis:{barLabels:barLabels}}
     * 
     */
    
    
    $.jqplot.MekkoRenderer = function(){
        this.shapeRenderer = new $.jqplot.ShapeRenderer();
        // prop: borderColor
        // color of the borders between areas on the chart
        this.borderColor = null;
        // prop: showBorders
        // True to draw borders lines between areas on the chart.
        // False will draw borders lines with the same color as the area.
        this.showBorders = true;
    };
    
    // called with scope of series.
    $.jqplot.MekkoRenderer.prototype.init = function(options, plot) {
        this.fill = false;
        this.fillRect = true;
        this.strokeRect = true;
        this.shadow = false;
        // width of bar on x axis.
        this._xwidth = 0;
        this._xstart = 0;
        $.extend(true, this.renderer, options);
        // set the shape renderer options
        var opts = {lineJoin:'miter', lineCap:'butt', isarc:false, fillRect:this.fillRect, strokeRect:this.strokeRect};
        this.renderer.shapeRenderer.init(opts);
        plot.axes.x2axis._series.push(this);
        this._type = 'mekko';
    };
    
    // Method: setGridData
    // converts the user data values to grid coordinates and stores them
    // in the gridData array.  Will convert user data into appropriate
    // rectangles.
    // Called with scope of a series.
    $.jqplot.MekkoRenderer.prototype.setGridData = function(plot) {
        // recalculate the grid data
        var xp = this._xaxis.series_u2p;
        var yp = this._yaxis.series_u2p;
        var data = this._plotData;
        this.gridData = [];
        // figure out width on x axis.
        // this._xwidth = this._sumy / plot._sumy * this.canvas.getWidth();
        this._xwidth = xp(this._sumy) - xp(0);
        if (this.index>0) {
            this._xstart = plot.series[this.index-1]._xstart + plot.series[this.index-1]._xwidth;
        }
        var totheight = this.canvas.getHeight();
        var sumy = 0;
        var cury;
        var curheight;
        for (var i=0; i<data.length; i++) {
            if (data[i] != null) {
                sumy += data[i][1];
                cury = totheight - (sumy / this._sumy * totheight);
                curheight = data[i][1] / this._sumy * totheight;
                this.gridData.push([this._xstart, cury, this._xwidth, curheight]);
            }
        }
    };
    
    // Method: makeGridData
    // converts any arbitrary data values to grid coordinates and
    // returns them.  This method exists so that plugins can use a series'
    // linerenderer to generate grid data points without overwriting the
    // grid data associated with that series.
    // Called with scope of a series.
    $.jqplot.MekkoRenderer.prototype.makeGridData = function(data, plot) {
        // recalculate the grid data
        // figure out width on x axis.
        var xp = this._xaxis.series_u2p;
        var totheight = this.canvas.getHeight();
        var sumy = 0;
        var cury;
        var curheight;
        var gd = [];
        for (var i=0; i<data.length; i++) {
            if (data[i] != null) {
                sumy += data[i][1];
                cury = totheight - (sumy / this._sumy * totheight);
                curheight = data[i][1] / this._sumy * totheight;
                gd.push([this._xstart, cury, this._xwidth, curheight]);
            }
        }
        return gd;
    };
    

    // called within scope of series.
    $.jqplot.MekkoRenderer.prototype.draw = function(ctx, gd, options) {
        var i;
        var opts = (options != undefined) ? options : {};
        var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
        var colorGenerator = new $.jqplot.ColorGenerator(this.seriesColors);
        ctx.save();
        if (gd.length) {
            if (showLine) {
                for (i=0; i<gd.length; i++){
                    opts.fillStyle = colorGenerator.next();
                    if (this.renderer.showBorders) {
                        opts.strokeStyle = this.renderer.borderColor;
                    }
                    else {
                        opts.strokeStyle = opts.fillStyle;
                    }
                    this.renderer.shapeRenderer.draw(ctx, gd[i], opts);
                }
            }
        }
        
        ctx.restore();
    };  
    
    $.jqplot.MekkoRenderer.prototype.drawShadow = function(ctx, gd, options) {
        // This is a no-op, no shadows on mekko charts.
    };
    
    /**
     * Class: $.jqplot.MekkoLegendRenderer
     * Legend renderer used by mekko charts with options for 
     * controlling number or rows and columns as well as placement
     * outside of plot area.
     * 
     */
    $.jqplot.MekkoLegendRenderer = function(){
        //
    };
    
    $.jqplot.MekkoLegendRenderer.prototype.init = function(options) {
        // prop: numberRows
        // Maximum number of rows in the legend.  0 or null for unlimited.
        this.numberRows = null;
        // prop: numberColumns
        // Maximum number of columns in the legend.  0 or null for unlimited.
        this.numberColumns = null;
        // this will override the placement option on the Legend object
        this.placement = "outside";
        $.extend(true, this, options);
    };
    
    // called with scope of legend
    $.jqplot.MekkoLegendRenderer.prototype.draw = function() {
        var legend = this;
        if (this.show) {
            var series = this._series;
            var ss = 'position:absolute;';
            ss += (this.background) ? 'background:'+this.background+';' : '';
            ss += (this.border) ? 'border:'+this.border+';' : '';
            ss += (this.fontSize) ? 'font-size:'+this.fontSize+';' : '';
            ss += (this.fontFamily) ? 'font-family:'+this.fontFamily+';' : '';
            ss += (this.textColor) ? 'color:'+this.textColor+';' : '';
            this._elem = $('<table class="jqplot-table-legend" style="'+ss+'"></table>');
            // Mekko charts  legends don't go by number of series, but by number of data points
            // in the series.  Refactor things here for that.
            
            var pad = false, 
                reverse = true,    // mekko charts are always stacked, so reverse
                nr, nc;
            var s = series[0];
            var colorGenerator = new $.jqplot.ColorGenerator(s.seriesColors);
            
            if (s.show) {
                var pd = s.data;
                if (this.numberRows) {
                    nr = this.numberRows;
                    if (!this.numberColumns){
                        nc = Math.ceil(pd.length/nr);
                    }
                    else{
                        nc = this.numberColumns;
                    }
                }
                else if (this.numberColumns) {
                    nc = this.numberColumns;
                    nr = Math.ceil(pd.length/this.numberColumns);
                }
                else {
                    nr = pd.length;
                    nc = 1;
                }
                
                var i, j, tr, td1, td2, lt, rs, color;
                var idx = 0;    
                
                for (i=0; i<nr; i++) {
                    if (reverse){
                        tr = $('<tr class="jqplot-table-legend"></tr>').prependTo(this._elem);
                    }
                    else{
                        tr = $('<tr class="jqplot-table-legend"></tr>').appendTo(this._elem);
                    }
                    for (j=0; j<nc; j++) {
                        if (idx < pd.length) {
                            lt = this.labels[idx] || pd[idx][0].toString();
                            color = colorGenerator.next();
                            if (!reverse){
                                if (i>0){
                                    pad = true;
                                }
                                else{
                                    pad = false;
                                }
                            }
                            else{
                                if (i == nr -1){
                                    pad = false;
                                }
                                else{
                                    pad = true;
                                }
                            }
                            rs = (pad) ? this.rowSpacing : '0';
                
                            td1 = $('<td class="jqplot-table-legend" style="text-align:center;padding-top:'+rs+';">'+
                                '<div><div class="jqplot-table-legend-swatch" style="border-color:'+color+';"></div>'+
                                '</div></td>');
                            td2 = $('<td class="jqplot-table-legend" style="padding-top:'+rs+';"></td>');
                            if (this.escapeHtml){
                                td2.text(lt);
                            }
                            else {
                                td2.html(lt);
                            }
                            if (reverse) {
                                td2.prependTo(tr);
                                td1.prependTo(tr);
                            }
                            else {
                                td1.appendTo(tr);
                                td2.appendTo(tr);
                            }
                            pad = true;
                        }
                        idx++;
                    }   
                }

                tr = null;
                td1 = null;
                td2 = null;
            }
        }
        return this._elem;
    };
    
    $.jqplot.MekkoLegendRenderer.prototype.pack = function(offsets) {
        if (this.show) {
            // fake a grid for positioning
            var grid = {_top:offsets.top, _left:offsets.left, _right:offsets.right, _bottom:this._plotDimensions.height - offsets.bottom};        
            if (this.placement == 'insideGrid') {
                switch (this.location) {
                    case 'nw':
                        var a = grid._left + this.xoffset;
                        var b = grid._top + this.yoffset;
                        this._elem.css('left', a);
                        this._elem.css('top', b);
                        break;
                    case 'n':
                        var a = (offsets.left + (this._plotDimensions.width - offsets.right))/2 - this.getWidth()/2;
                        var b = grid._top + this.yoffset;
                        this._elem.css('left', a);
                        this._elem.css('top', b);
                        break;
                    case 'ne':
                        var a = offsets.right + this.xoffset;
                        var b = grid._top + this.yoffset;
                        this._elem.css({right:a, top:b});
                        break;
                    case 'e':
                        var a = offsets.right + this.xoffset;
                        var b = (offsets.top + (this._plotDimensions.height - offsets.bottom))/2 - this.getHeight()/2;
                        this._elem.css({right:a, top:b});
                        break;
                    case 'se':
                        var a = offsets.right + this.xoffset;
                        var b = offsets.bottom + this.yoffset;
                        this._elem.css({right:a, bottom:b});
                        break;
                    case 's':
                        var a = (offsets.left + (this._plotDimensions.width - offsets.right))/2 - this.getWidth()/2;
                        var b = offsets.bottom + this.yoffset;
                        this._elem.css({left:a, bottom:b});
                        break;
                    case 'sw':
                        var a = grid._left + this.xoffset;
                        var b = offsets.bottom + this.yoffset;
                        this._elem.css({left:a, bottom:b});
                        break;
                    case 'w':
                        var a = grid._left + this.xoffset;
                        var b = (offsets.top + (this._plotDimensions.height - offsets.bottom))/2 - this.getHeight()/2;
                        this._elem.css({left:a, top:b});
                        break;
                    default:  // same as 'se'
                        var a = grid._right - this.xoffset;
                        var b = grid._bottom + this.yoffset;
                        this._elem.css({right:a, bottom:b});
                        break;
                }
                
            }
            else {
                switch (this.location) {
                    case 'nw':
                        var a = this._plotDimensions.width - grid._left + this.xoffset;
                        var b = grid._top + this.yoffset;
                        this._elem.css('right', a);
                        this._elem.css('top', b);
                        break;
                    case 'n':
                        var a = (offsets.left + (this._plotDimensions.width - offsets.right))/2 - this.getWidth()/2;
                        var b = this._plotDimensions.height - grid._top + this.yoffset;
                        this._elem.css('left', a);
                        this._elem.css('bottom', b);
                        break;
                    case 'ne':
                        var a = this._plotDimensions.width - offsets.right + this.xoffset;
                        var b = grid._top + this.yoffset;
                        this._elem.css({left:a, top:b});
                        break;
                    case 'e':
                        var a = this._plotDimensions.width - offsets.right + this.xoffset;
                        var b = (offsets.top + (this._plotDimensions.height - offsets.bottom))/2 - this.getHeight()/2;
                        this._elem.css({left:a, top:b});
                        break;
                    case 'se':
                        var a = this._plotDimensions.width - offsets.right + this.xoffset;
                        var b = offsets.bottom + this.yoffset;
                        this._elem.css({left:a, bottom:b});
                        break;
                    case 's':
                        var a = (offsets.left + (this._plotDimensions.width - offsets.right))/2 - this.getWidth()/2;
                        var b = this._plotDimensions.height - offsets.bottom + this.yoffset;
                        this._elem.css({left:a, top:b});
                        break;
                    case 'sw':
                        var a = this._plotDimensions.width - grid._left + this.xoffset;
                        var b = offsets.bottom + this.yoffset;
                        this._elem.css({right:a, bottom:b});
                        break;
                    case 'w':
                        var a = this._plotDimensions.width - grid._left + this.xoffset;
                        var b = (offsets.top + (this._plotDimensions.height - offsets.bottom))/2 - this.getHeight()/2;
                        this._elem.css({right:a, top:b});
                        break;
                    default:  // same as 'se'
                        var a = grid._right - this.xoffset;
                        var b = grid._bottom + this.yoffset;
                        this._elem.css({right:a, bottom:b});
                        break;
                }
            }
        } 
    };
    
    // setup default renderers for axes and legend so user doesn't have to
    // called with scope of plot
    function preInit(target, data, options) {
        options = options || {};
        options.axesDefaults = options.axesDefaults || {};
        options.legend = options.legend || {};
        options.seriesDefaults = options.seriesDefaults || {};
        var setopts = false;
        if (options.seriesDefaults.renderer == $.jqplot.MekkoRenderer) {
            setopts = true;
        }
        else if (options.series) {
            for (var i=0; i < options.series.length; i++) {
                if (options.series[i].renderer == $.jqplot.MekkoRenderer) {
                    setopts = true;
                }
            }
        }
        
        if (setopts) {
            options.axesDefaults.renderer = $.jqplot.MekkoAxisRenderer;
            options.legend.renderer = $.jqplot.MekkoLegendRenderer;
            options.legend.preDraw = true;
        }
    }
    
    $.jqplot.preInitHooks.push(preInit);
    
})(jQuery);