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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 22x 22x 22x 22x 22x 22x 22x 22x 10x 10x 22x 5x 5x 5x 5x 5x 5x 5x 5x 22x 22x 22x 22x 22x 22x 22x 22x | /**
* Label collision detection and fade logic shared between number line and coordinate plane.
*/
/** Per-label fade state for smooth collision show/hide transitions */
export interface CollisionFadeEntry {
/** Whether the label is currently visible (not collision-hidden) */
visible: boolean
/** performance.now() when visibility last changed */
startTime: number
/** Opacity at the moment visibility changed (to animate from) */
startOpacity: number
}
/** Map from tick value -> fade state, persisted across frames */
export type CollisionFadeMap = Map<number, CollisionFadeEntry>
/**
* Compute collision opacity for a single label, updating the fade map entry.
*
* Returns the current opacity (0-1) and whether the animation is still in progress.
*/
export function computeCollisionOpacity(
value: number,
isVisible: boolean,
fadeMap: CollisionFadeMap,
now: number,
fadeDurationMs: number
): { opacity: number; animating: boolean } {
let entry = fadeMap.get(value)
if (!entry) {
entry = { visible: isVisible, startTime: now, startOpacity: isVisible ? 1 : 0 }
fadeMap.set(value, entry)
} else if (entry.visible !== isVisible) {
const elapsed = now - entry.startTime
const t = Math.min(1, elapsed / fadeDurationMs)
const prevTarget = entry.visible ? 1 : 0
const currentOpacity = entry.startOpacity + (prevTarget - entry.startOpacity) * t
entry.visible = isVisible
entry.startTime = now
entry.startOpacity = currentOpacity
}
const elapsed = now - entry.startTime
const t = Math.min(1, elapsed / fadeDurationMs)
const target = entry.visible ? 1 : 0
const opacity = entry.startOpacity + (target - entry.startOpacity) * t
return { opacity, animating: t < 1 }
}
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