Function plotTextLines

src/traces/pie/plot.js:328–378

(slices, trace)

// TODO add support for transition
function plotTextLines(slices, trace) {
    slices.each(function (pt) {
        var sliceTop = d3.select(this);

        if (!pt.labelExtraX && !pt.labelExtraY) {
            sliceTop.select('path.textline').remove();
            return;
        }

        // first move the text to its new location
        var sliceText = sliceTop.select('g.slicetext text');

        pt.transform.targetX += pt.labelExtraX;
        pt.transform.targetY += pt.labelExtraY;

        Lib.setTransormAndDisplay(sliceText, pt.transform);

        // then add a line to the new location
        var lineStartX = pt.cxFinal + pt.pxmid[0];
        var lineStartY = pt.cyFinal + pt.pxmid[1];
        var textLinePath = 'M' + lineStartX + ',' + lineStartY;
        var finalX = ((pt.yLabelMax - pt.yLabelMin) * (pt.pxmid[0] < 0 ? -1 : 1)) / 4;

        if (pt.labelExtraX) {
            var yFromX = (pt.labelExtraX * pt.pxmid[1]) / pt.pxmid[0];
            var yNet = pt.yLabelMid + pt.labelExtraY - (pt.cyFinal + pt.pxmid[1]);

            if (Math.abs(yFromX) > Math.abs(yNet)) {
                textLinePath +=
                    'l' +
                    (yNet * pt.pxmid[0]) / pt.pxmid[1] +
                    ',' +
                    yNet +
                    'H' +
                    (lineStartX + pt.labelExtraX + finalX);
            } else {
                textLinePath += 'l' + pt.labelExtraX + ',' + yFromX + 'v' + (yNet - yFromX) + 'h' + finalX;
            }
        } else {
            textLinePath += 'V' + (pt.yLabelMid + pt.labelExtraY) + 'h' + finalX;
        }

        Lib.ensureSingle(sliceTop, 'path', 'textline')
            .call(Color.stroke, trace.outsidetextfont.color)
            .attr({
                'stroke-width': Math.min(2, trace.outsidetextfont.size / 8),
                d: textLinePath,
                fill: 'none'
            });
    });
}

function attachFxHandlers(sliceTop, gd, cd) {
    var cd0 = cd[0];