41e93d01ab
Ported from claude/epic-faraday-332679 (6c5889c) — merge was permission-blocked,
same diff applied directly.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
18 lines
795 B
TypeScript
18 lines
795 B
TypeScript
/** How long the door tutorial text stays fully lit before it starts to fade. */
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export const TUTORIAL_MS = 26_000;
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/** Length of the fade once the hold expires. */
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export const TUTORIAL_FADE_MS = 800;
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/**
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* Tutorial text alpha at `elapsedMs` into the night. Pure update()-driven math,
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* deliberately NOT a tween: the old `if (alpha > 0) tweens.add(...)` guard
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* spawned a fresh 800ms tween every frame (each new tween re-captured the
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* current alpha and kept it above zero, so the guard never closed — ~1,100 live
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* tweens by night's end), and tweens stall under the preview pane's stepped
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* clock anyway.
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*/
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export function tutorialAlpha(elapsedMs: number): number {
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if (elapsedMs <= TUTORIAL_MS) return 1;
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return Math.max(0, 1 - (elapsedMs - TUTORIAL_MS) / TUTORIAL_FADE_MS);
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}
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