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declare_tween!(
/// An quadratic tween in. Go [here](https://easings.net/#easeInQuad) for a visual demonstration.
pub struct QuadIn;
/// Creates a new [QuadIn] Tweener.
pub fn quad_in;
/// Creates a new [QuadIn] Tweener at the given time.
pub fn quad_in_at;
pub fn tween<Value: crate::TweenValue>(&mut self, value_delta: Value, percent: f32) -> Value {
value_delta.scale(percent * percent)
}
);
declare_tween!(
/// An quadratic tween out. Go [here](https://easings.net/#easeOutQuad) for a visual demonstration.
pub struct QuadOut;
/// Creates a new [QuadOut] Tweener.
pub fn quad_out;
/// Creates a new [QuadOut] Tweener at the given time.
pub fn quad_out_at;
pub fn tween<Value: crate::TweenValue>(&mut self, value_delta: Value, percent: f32) -> Value {
value_delta.scale(-percent).scale(percent - 2.0)
}
);
declare_tween!(
/// An quadratic tween in and out. Go [here](https://easings.net/#easeInOutQuad) for a visual demonstration.
pub struct QuadInOut;
/// Creates a new [QuadInOut] Tweener.
pub fn quad_in_out;
/// Creates a new [QuadInOut] Tweener at the given time.
pub fn quad_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
} else {
let p = percent - 1.0;
-(p * (p - 2.0) - 1.0)
};
value_delta.scale(scalar / 2.0)
}
);
test_tween!(Quad);