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add scroll/dolly notes

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This commit is contained in:
Stewart Allen 2026-01-11 15:29:05 -05:00
commit 8d647140e8
1 changed files with 6 additions and 4 deletions
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10
src/moto/orbit.js
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@ -462,16 +462,18 @@ class Orbit extends EventDispatcher {
slider(null);
// Normalize delta across browsers
// Goal: scroll up = negative delta = zoom in, scroll down = positive delta = zoom out
let delta = 0;
if (event.wheelDelta !== undefined) {
// Chrome/Safari use wheelDelta (positive = scroll up, zoom out)
// Chrome/Safari wheelDelta: scroll up = +120, scroll down = -120
// Negate to match deltaY convention
delta = -event.wheelDelta;
} else if (event.detail !== undefined) {
// Old Firefox DOMMouseScroll uses detail
// Old Firefox DOMMouseScroll detail: scroll up = -3, scroll down = +3
delta = event.detail * 40; // Normalize to pixel values
} else if (event.deltaY !== undefined) {
// Modern browsers (including Firefox) use deltaY
// Firefox can send deltas in different units (pixels, lines, pages)
// Modern browsers deltaY: scroll up = negative, scroll down = positive
// Already matches our convention
delta = event.deltaY;
// Firefox's deltaMode indicates the unit of deltaY
// DOM_DELTA_PIXEL (0x00) - pixels