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19 lines
600 B
19 lines
600 B
export function basis(t1, v0, v1, v2, v3) { |
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var t2 = t1 * t1, t3 = t2 * t1; |
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return ((1 - 3 * t1 + 3 * t2 - t3) * v0 |
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+ (4 - 6 * t2 + 3 * t3) * v1 |
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+ (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2 |
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+ t3 * v3) / 6; |
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} |
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export default function(values) { |
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var n = values.length - 1; |
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return function(t) { |
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var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n), |
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v1 = values[i], |
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v2 = values[i + 1], |
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v0 = i > 0 ? values[i - 1] : 2 * v1 - v2, |
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v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1; |
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return basis((t - i / n) * n, v0, v1, v2, v3); |
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}; |
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}
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