feat(core): smooth noisy pinch frames before applying zoom#10328
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charlieforward9 wants to merge 2 commits into
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feat(core): smooth noisy pinch frames before applying zoom#10328charlieforward9 wants to merge 2 commits into
charlieforward9 wants to merge 2 commits into
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Clamp the per-event change in log2(scale) so a single jittery pinch frame (most commonly the last frame as fingers lift) can't propagate a spike directly into the camera zoom. The smoothed log-scale is reset on pinchstart and cleared on pinchend so each gesture stands alone. The 0.18 cap allows up to ~1.13× zoom per event — comfortably above any intentional pinch rate but tight enough to swallow sensor noise.
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coverage: 83.392% (+0.002%) from 83.39% — NEW-HEAT:codex/touch-pinch-smoothing into visgl:master |
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Summary
Clamps per-event pinch zoom deltas so a single noisy touch frame cannot jump the camera.
Why
Touch pinch streams can produce one bad scale value, especially near finger lift. Applying that raw value directly to
zoommakes the map jump even though the user’s gesture was smooth.Change
pinchstartand clear it onpinchend.log2(scale)delta to 0.18, roughly a 1.13x zoom step, before applying it.Validation
MapController clamps a noisy final pinch frame instead of jumping, covering a 100x scale spike and asserting the zoom delta stays under the per-event cap.vitest run --project browser test/modules/core/controllers/controllers.spec.ts.Merge Notes
Independent split from #10303. #10329 handles pinch-end inertia; this PR handles live pinch-frame noise.