Use Horner's method to evaluate cubics
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@ -1736,15 +1736,11 @@ impl CubicAxis {
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}
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}
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impl SolveT for CubicAxis {
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impl SolveT for CubicAxis {
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fn sample(&self, t: f32) -> f32 {
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fn sample(&self, t: f32) -> f32 {
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let t2 = t * t;
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let b3 = self.to + 3.0 * (self.ctrl0 - self.ctrl1) - self.from;
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let t3 = t2 * t;
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let b2 = 3.0 * (self.from - 2.0 * self.ctrl0 + self.ctrl1) + b3 * t;
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let b1 = 3.0 * (self.ctrl0 - self.from) + b2 * t;
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let c3 = self.to + 3.0 * (self.ctrl0 - self.ctrl1) - self.from;
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let b0 = self.from + b1 * t;
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let c2 = 3.0 * (self.from - 2.0 * self.ctrl0 + self.ctrl1);
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b0
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let c1 = 3.0 * (self.ctrl0 - self.from);
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let c0 = self.from;
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c3 * t3 + c2 * t2 + c1 * t + c0
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}
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}
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fn sample_deriv(&self, t: f32) -> f32 {
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fn sample_deriv(&self, t: f32) -> f32 {
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let inv_t = 1.0 - t;
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let inv_t = 1.0 - t;
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