basis.js
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basis.js
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	export function basis(t1, v0, v1, v2, v3) {
	var t2 = t1 * t1, t3 = t2 * t1;
	return ((1 - 3 * t1 + 3 * t2 - t3) * v0
	+ (4 - 6 * t2 + 3 * t3) * v1
	+ (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
	+ t3 * v3) / 6;
	}

	export default function(values) {
	var n = values.length - 1;
	return function(t) {
	var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
	v1 = values[i],
	v2 = values[i + 1],
	v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
	v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
	return basis((t - i / n) * n, v0, v1, v2, v3);
	};
	}

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