19 lines
543 B
Rust
19 lines
543 B
Rust
/// A cubic bezier function like CSS `cubic-bezier`.
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///
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/// Builder:
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///
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/// https://cubic-bezier.com
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pub fn cubic_bezier(x1: f32, y1: f32, x2: f32, y2: f32) -> impl Fn(f32) -> f32 {
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move |t: f32| {
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let one_t = 1.0 - t;
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let one_t2 = one_t * one_t;
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let t2 = t * t;
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let t3 = t2 * t;
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// The Bezier curve function for x and y, where x0 = 0, y0 = 0, x3 = 1, y3 = 1
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let _x = 3.0 * x1 * one_t2 * t + 3.0 * x2 * one_t * t2 + t3;
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3.0 * y1 * one_t2 * t + 3.0 * y2 * one_t * t2 + t3
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}
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}
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