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Add transitionFromFrame #91

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merged 1 commit into from
May 27, 2023
Merged

Add transitionFromFrame #91

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11 changes: 11 additions & 0 deletions renin/src/interpolations.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -28,3 +28,14 @@ export function elasticOut(b: number, c: number, d: number, t: number) {
const tc = ts * t;
return b + c * (33 * tc * ts + -106 * ts * ts + 126 * tc + -67 * ts + 15 * t);
}

/**
* Transition from 0 to 1 from a specific startFrame for duration duration.
* @param frame The current frame
* @param duration How many frames the transition takes
* @param startFrame What frame to start the transition at
* @returns value in [0, 1) representing the progression into the interval.
*/
export function transitionFromFrame(frame: number, duration: number, startFrame: number) {
return lerp(0, 1, (frame - startFrame) / duration);
}