Function computeTransform

src/traces/pie/plot.js:1285–1297

(
    transform, // inout
    textBB // in
)

}

function computeTransform(
    transform, // inout
    textBB // in
) {
    var a = (transform.rotate * Math.PI) / 180;
    var cosA = Math.cos(a);
    var sinA = Math.sin(a);
    var midX = (textBB.left + textBB.right) / 2;
    var midY = (textBB.top + textBB.bottom) / 2;
    transform.textX = midX * cosA - midY * sinA;
    transform.textY = midX * sinA + midY * cosA;
    transform.noCenter = true;
}

module.exports = {
    plot: plot,