Function crossTraceCalc

src/traces/pie/calc.js:111–143

(gd, plotinfo)

 * in the order slices will be displayed
 */
function crossTraceCalc(gd, plotinfo) { // TODO: should we name the second argument opts?
    var desiredType = (plotinfo || {}).type;
    if(!desiredType) desiredType = 'pie';

    var fullLayout = gd._fullLayout;
    var calcdata = gd.calcdata;
    var colorWay = fullLayout[desiredType + 'colorway'];
    var colorMap = fullLayout['_' + desiredType + 'colormap'];

    if(fullLayout['extend' + desiredType + 'colors']) {
        colorWay = generateExtendedColors(colorWay, extendedColorWayList);
    }
    var dfltColorCount = 0;

    for(var i = 0; i < calcdata.length; i++) {
        var cd = calcdata[i];
        var traceType = cd[0].trace.type;
        if(traceType !== desiredType) continue;

        for(var j = 0; j < cd.length; j++) {
            var pt = cd[j];
            if(pt.color === false) {
                // have we seen this label and assigned a color to it in a previous trace?
                if(colorMap[pt.label]) {
                    pt.color = colorMap[pt.label];
                } else {
                    colorMap[pt.label] = pt.color = colorWay[dfltColorCount % colorWay.length];
                    dfltColorCount++;
                }
            }
        }
    }
}

/**
 * pick a default color from the main default set, augmented by