one/dist/esm/platform/effects/curves.mjs

One is a React framework for web, iOS, and Android apps.

const SAMPLE_N = 32;
const PRESETS = {
	smooth: (t) => (1 - t) ** 3,
	sharp: (t) => (1 - t) ** 5,
	gentle: (t) => (1 - t) ** 2,
	soft: (t) => Math.cos(t * Math.PI / 2),
	smoother: (t) => 1 - t * t * t * (t * (t * 6 - 15) + 10),
	linear: (t) => 1 - t
};
function cubicBezierEval(x1, y1, x2, y2, x) {
	if (x <= 0) return 0;
	if (x >= 1) return 1;
	const cx = 3 * x1;
	const bx = 3 * (x2 - x1) - cx;
	const ax = 1 - cx - bx;
	const cy = 3 * y1;
	const by = 3 * (y2 - y1) - cy;
	const ay = 1 - cy - by;
	let t = x;
	for (let i = 0; i < 8; i++) {
		const bxt = ((ax * t + bx) * t + cx) * t;
		const dbxt = (3 * ax * t + 2 * bx) * t + cx;
		if (Math.abs(dbxt) < 1e-6) break;
		t = Math.max(0, Math.min(1, t - (bxt - x) / dbxt));
	}
	return ((ay * t + by) * t + cy) * t;
}
function sampleCubicBezier(curve) {
	const { x1, y1, x2, y2 } = curve;
	return Array.from({ length: SAMPLE_N }, (_, i) => Number.parseFloat((1 - cubicBezierEval(x1, y1, x2, y2, i / (SAMPLE_N - 1))).toFixed(4)));
}
function normalizeStops(curve) {
	return curve.values.map((v) => Math.max(0, Math.min(1, v)));
}
function sampleCurve(curve) {
	if (typeof curve === "string") {
		const fn = PRESETS[curve] ?? PRESETS.smooth;
		return Array.from({ length: SAMPLE_N }, (_, i) => Number.parseFloat(fn(i / (SAMPLE_N - 1)).toFixed(4)));
	}
	return curve.type === "cubicBezier" ? sampleCubicBezier(curve) : normalizeStops(curve);
}
function serializeCurve(curve) {
	if (typeof curve === "string") return curve;
	return sampleCurve(curve).join(",");
}

export { sampleCurve, serializeCurve };
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