one/dist/esm/platform/effects/curves.native.js

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

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