New pinch touch zoom [draft] #149
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…ler to allow use in touch story example
…made it so mousemove/pointermove events are ignored when there's multitouch and addMouseWheelListener enabled
tbouffard
reviewed
Jan 13, 2026
| const getTouchDistance = (touches: TouchArray) => { | ||
| const a = touches[0].clientX - touches[1].clientX; | ||
| const b = touches[0].clientY - touches[1].clientY; | ||
| return Math.sqrt(a * a + b * b); |
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suggestion: use Math.hypot instead (perform the same calculation)
tbouffard
reviewed
Jan 13, 2026
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| InternalEvent.addListener(target, 'gesturechange', ((evt: GestureEvent) => { | ||
| InternalEvent.consume(evt); | ||
| const getTouchDistance = (touches: TouchArray) => { |
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suggestion: move this closure out of the enclosing function as it doesn't depend on any state provided by this function
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| if (typeof evt.scale === 'number') { | ||
| const diff = scale - evt.scale; | ||
| const touchesToArray = (touches: TouchList): TouchArray => { |
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suggestion: move this closure out of the enclosing function as getTouchDistance.
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Summary
Fixes jumpy multitouch zooming on Android, and restores the touch example by converting it to StoryBook and ES6 classes.
More details/caveats of this PR are in the comment at #62 (comment).
Description for the changelog
Resolves #62.