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Add optional center of rotation on setTransform #198

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Add optional center of rotation on setTransform #198

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5 changes: 3 additions & 2 deletions src/elements.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -905,12 +905,13 @@ export class SVGBaseView<T extends SVGGraphicsElement> extends BaseView<T> {
return matrix as [[number, number, number], [number, number, number]];
}

setTransform(posn?: SimplePoint, angle = 0, scale = 1) {
setTransform(posn?: SimplePoint, angle = 0, scale = 1, rotCenter?: SimplePoint) {
// TODO Safari only supports transform-origin and transform-box for CSS
// transforms, not the [transform=] attribute:
// https://stackoverflow.com/questions/61272308/
const center = rotCenter ?? {x: 0, y: 0};
const t1 = posn ? `translate(${roundTo(posn.x, 0.1)} ${roundTo(posn.y, 0.1)})` : '';
const t2 = nearlyEquals(angle, 0) ? '' : `rotate(${angle * 180 / Math.PI})`;
const t2 = nearlyEquals(angle, 0) ? '' : `rotate(${angle * 180 / Math.PI}, ${center.x} , ${center.y})`;
const t3 = nearlyEquals(scale, 1) ? '' : `scale(${scale})`;
this.setAttr('transform', [t1, t2, t3].join(' '));
}
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