Motion Animation Utilities (src/motion.ts)

A collection of mathematical easing functions and progress helpers for frame-based animations. Use these to create smooth transitions and custom motion effects.

// Source: https://github.com/nishit-g/tokovo | License: MIT | Copyright 2026 Tokovo contributors
// Provided via justclaw.it.com; keep this notice with the code.
const TAU = Math.PI * 2;

export function clamp01(value: number): number {
  return Math.min(1, Math.max(0, value));
}

export function frameProgress(frame: number, startFrame: number, durationInFrames: number): number {
  if (durationInFrames <= 0) return frame >= startFrame ? 1 : 0;
  return clamp01((frame - startFrame) / durationInFrames);
}

export function easeOutCubic(progress: number): number {
  const p = clamp01(progress);
  return 1 - Math.pow(1 - p, 3);
}

export function easeInOutSine(progress: number): number {
  const p = clamp01(progress);
  return -(Math.cos(Math.PI * p) - 1) / 2;
}

export function loopProgress(


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