40 lines
828 B
Rust
40 lines
828 B
Rust
use ::std::f32::consts::PI;
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const C4: f32 = (2.0 * PI) / 3.0;
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const C5: f32 = (2.0 * PI) / 4.5;
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/// <https://easings.net/#easeInElastic>
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pub fn elastic_in(t: f32) -> f32 {
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if t <= 0.0 {
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0.0
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} else if 1.0 <= t {
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1.0
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} else {
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-2f32.powf(10.0 * t - 10.0) * ((t * 10.0 - 10.75) * C4).sin()
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}
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}
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/// <https://easings.net/#easeOutElastic>
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pub fn elastic_out(t: f32) -> f32 {
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if t <= 0.0 {
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0.0
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} else if 1.0 <= t {
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1.0
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} else {
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2f32.powf(-10.0 * t) * ((t * 10.0 - 0.75) * C4).sin() + 1.0
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}
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}
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/// <https://easings.net/#easeInOutElastic>
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pub fn elastic_in_out(t: f32) -> f32 {
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if t <= 0.0 {
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0.0
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} else if 1.0 <= t {
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1.0
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} else if t < 0.5 {
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-(2f32.powf(20.0 * t - 10.0) * ((20.0 * t - 11.125) * C5).sin()) / 2.0
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} else {
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(2f32.powf(-20.0 * t + 10.0) * ((20.0 * t - 11.125) * C5).sin()) / 2.0 + 1.0
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}
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}
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