57 lines
1.3 KiB
Rust
57 lines
1.3 KiB
Rust
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use keyframe::EasingFunction;
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pub struct Animation {
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time: f32,
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duration: f32,
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from: f32,
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to: f32,
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function: Option<Box<dyn EasingFunction>>,
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direction: bool,
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}
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impl Animation {
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pub fn new(start: f32) -> Self {
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Self {
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time: 1.0,
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duration: 0.0,
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from: 0.0,
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to: start,
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function: None,
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direction: true,
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}
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}
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pub fn update(&mut self, dt: f32) {
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self.time += dt;
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}
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pub fn is_active(&self) -> bool {
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self.function.is_none() || self.time >= self.duration
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}
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pub fn get(&self) -> f32 {
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if self.time >= self.duration {
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self.to
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} else if let Some(function) = self.function.as_ref() {
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let (from, to) = if self.direction {
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(self.from, self.to)
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} else {
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(self.to, self.from)
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};
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let lerp = function.y((self.time / self.duration) as f64) as f32;
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(1.0 - lerp) * from + lerp * to
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} else {
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self.to
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}
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}
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pub fn ease_to(&mut self, function: Box<dyn EasingFunction>, duration: f32, to: f32) {
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self.from = self.get();
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self.to = to;
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self.time = 0.0;
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self.duration = duration;
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self.function = Some(function);
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}
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}
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