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Calculate rotation correctly when pointers change order #1136

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Calculate rotation correctly when pointers change order #1136

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8 changes: 7 additions & 1 deletion src/inputjs/get-rotation.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,5 +9,11 @@ import { PROPS_CLIENT_XY } from './input-consts';
* @return {Number} rotation
*/
export default function getRotation(start, end) {
return getAngle(end[1], end[0], PROPS_CLIENT_XY) + getAngle(start[1], start[0], PROPS_CLIENT_XY);
let startSorted = start[0].identifier < start[1].identifier;
let start0 = startSorted ? start[0] : start[1];
let start1 = startSorted ? start[1] : start[0];
let endSorted = end[0].identifier < end[1].identifier;
let end0 = endSorted ? end[0] : end[1];
let end1 = endSorted ? end[1] : end[0];
return getAngle(end0, end1, PROPS_CLIENT_XY) - getAngle(start0, start1, PROPS_CLIENT_XY);
}