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use bevy::prelude::Resource;
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use bevy::utils::Instant;
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use std::f32::consts::PI;
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use std::fmt::Debug;
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use std::sync::atomic::{ AtomicBool, Ordering };
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use std::sync::Arc;
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#[derive(Debug, Clone, Resource)]
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pub(crate) struct EasedChange<T: Debug + Clone> {
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pub(crate) from: T,
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pub(crate) to: T,
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pub(crate) duration: f32,
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pub(crate) done: Arc<AtomicBool>,
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pub(crate) start_time: Instant,
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}
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impl<T: Debug + Clone> EasedChange<T> {
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pub(crate) fn new(from: T, to: T, duration: f32) -> Self {
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Self {
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from,
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to,
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duration,
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done: Arc::new(AtomicBool::new(false)),
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start_time: Instant::now(),
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}
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}
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pub(crate) fn input(&self) -> f32 {
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(self.start_time.elapsed().as_secs_f32() / self.duration).min(1.0)
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}
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pub(crate) fn is_done(&self) -> bool {
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self.input() >= 0.99
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}
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pub(crate) fn set_done(&mut self) {
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self.done.store(true, Ordering::Relaxed);
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}
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pub(crate) fn elastic(&self, bounciness: f32) -> f32 {
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let p = bounciness * PI;
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let t = self.input();
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1.0 - ((t * PI) / 2.0).cos().powi(3) * (t * p).cos()
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}
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pub(crate) fn smooth_start(&self) -> f32 {
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let x = self.input();
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x.powf(1.5)
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}
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pub(crate) fn smooth_end(&self) -> f32 {
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let x = self.input();
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let n = 1.0 - x;
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1.0 - n * n
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}
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}
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