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declare_tween!(
/// An quartic tween in. Go [here](https://easings.net/#easeInQuart) for a visual demonstration.
pub struct QuartIn;
/// Creates a new [QuartIn] Tweener.
pub fn quart_in;
/// Creates a new [QuartIn] Tweener at the given time.
pub fn quart_in_at;
pub fn tween<Value: crate::TweenValue>(&mut self, value_delta: Value, percent: f32) -> Value {
value_delta.scale(percent * percent * percent * percent)
}
);
declare_tween!(
/// An quartic tween out. Go [here](https://easings.net/#easeOutQuart) for a visual demonstration.
pub struct QuartOut;
/// Creates a new [QuartOut] Tweener.
pub fn quart_out;
/// Creates a new [QuartOut] Tweener at the given time.
pub fn quart_out_at;
pub fn tween<Value: crate::TweenValue>(&mut self, value_delta: Value, mut percent: f32) -> Value {
percent -= 1.0;
value_delta.scale(-(percent * percent * percent * percent - 1.0))
}
);
declare_tween!(
/// An quartic tween in and out. Go [here](https://easings.net/#easeInOutQuart) for a visual demonstration.
pub struct QuartInOut;
/// Creates a new [QuartInOut] Tweener.
pub fn quart_in_out;
/// Creates a new [QuartInOut] Tweener at the given time.
pub fn quart_in_out_at;
pub fn tween<Value: crate::TweenValue>(&mut self, value_delta: Value, mut percent: f32) -> Value {
percent *= 2.0;
let scalar = if percent < 1.0 {
percent * percent * percent * percent
} else {
let p = percent - 2.0;
-(p * p * p * p - 2.0)
};
value_delta.scale(scalar / 2.0)
}
);
test_tween!(Quart);