PlotKit.Layout.prototype._evaluateBarCharts = function()

in web/servicemix-web-console/src/main/webapp/js/plotkit/Layout.js [318:373]
47 lines of code
5 McCabe index (conditional complexity)

PlotKit.Layout.prototype._evaluateBarCharts = function() {
    var keys = MochiKit.Base.keys;
    var items = MochiKit.Base.items;

    var setCount = keys(this.datasets).length;

    // work out how far separated values are
    var xdelta = 10000000;
    var xvalues = this._uniqueXValues();
    for (var i = 1; i < xvalues.length; i++) {
        xdelta = Math.min(Math.abs(xvalues[i] - xvalues[i-1]), xdelta);
    }

    var barWidth = 0;
    var barWidthForSet = 0;
    var barMargin = 0;
    if (xvalues.length == 1) {
        // note we have to do something smarter if we only plot one value
        xdelta = 1.0;
        this.xscale = 1.0;
        this.minxval = xvalues[0];
        barWidth = 1.0 * this.options.barWidthFillFraction;
        barWidthForSet = barWidth/setCount;
        barMargin = (1.0 - this.options.barWidthFillFraction)/2;
    }
    else {
        // readjust xscale to fix with bar charts
        this.xscale = (1.0 - xdelta/this.xrange)/this.xrange;
        barWidth = xdelta * this.xscale * this.options.barWidthFillFraction;
        barWidthForSet = barWidth / setCount;
        barMargin = xdelta * this.xscale * (1.0 - this.options.barWidthFillFraction)/2;
    }

    this.minxdelta = xdelta; // need this for tick positions

    // add all the rects
    this.bars = new Array();
    var i = 0;
    for (var setName in this.datasets) {
        var dataset = this.datasets[setName];
        for (var j = 0; j < dataset.length; j++) {
            var item = dataset[j];
            var rect = {
                x: ((parseFloat(item[0]) - this.minxval) * this.xscale) + (i * barWidthForSet) + barMargin,
                y: 1.0 - ((parseFloat(item[1]) - this.minyval) * this.yscale),
                w: barWidthForSet,
                h: ((parseFloat(item[1]) - this.minyval) * this.yscale),
                xval: parseFloat(item[0]),
                yval: parseFloat(item[1]),
                name: setName
            };
            this.bars.push(rect);
        }
        i++;
    }
};