Function transformInsideText

src/traces/pie/plot.js:679–794

(textBB, pt, cd0)

}

function transformInsideText(textBB, pt, cd0) {
    var r = cd0.r || pt.rpx1;
    var rInscribed = pt.rInscribed;

    var isEmpty = pt.startangle === pt.stopangle;
    if (isEmpty) {
        return {
            rCenter: 1 - rInscribed,
            scale: 0,
            rotate: 0,
            textPosAngle: 0
        };
    }

    var ring = pt.ring;
    var isCircle = ring === 1 && Math.abs(pt.startangle - pt.stopangle) === Math.PI * 2;

    var halfAngle = pt.halfangle;
    var midAngle = pt.midangle;

    var orientation = cd0.trace.insidetextorientation;
    var isHorizontal = orientation === 'horizontal';
    var isTangential = orientation === 'tangential';
    var isRadial = orientation === 'radial';
    var isAuto = orientation === 'auto';

    var allTransforms = [];
    var newT;

    if (!isAuto) {
        // max size if text is placed (horizontally) at the top or bottom of the arc

        var considerCrossing = function (angle, key) {
            if (isCrossing(pt, angle)) {
                var dStart = Math.abs(angle - pt.startangle);
                var dStop = Math.abs(angle - pt.stopangle);

                var closestEdge = dStart < dStop ? dStart : dStop;

                if (key === 'tan') {
                    newT = calcTanTransform(textBB, r, ring, closestEdge, 0);
                } else {
                    // case of 'rad'
                    newT = calcRadTransform(textBB, r, ring, closestEdge, Math.PI / 2);
                }
                newT.textPosAngle = angle;

                allTransforms.push(newT);
            }
        };

        // to cover all cases with trace.rotation added
        var i;
        if (isHorizontal || isTangential) {
            // top
            for (i = 4; i >= -4; i -= 2) considerCrossing(Math.PI * i, 'tan');
            // bottom
            for (i = 4; i >= -4; i -= 2) considerCrossing(Math.PI * (i + 1), 'tan');