ranim-anims 0.1.5

The built-in animations of Ranim.
Documentation 
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use ranim_core::{
    animation::{AnimationSpan, EvalDynamic},
    traits::{Alignable, Interpolatable},
    utils::rate_functions::smooth,
};

// ANCHOR: TransformRequirement
/// The requirement of [`Transform`]
pub trait TransformRequirement: Alignable + Interpolatable + Clone {}
impl<T: Alignable + Interpolatable + Clone> TransformRequirement for T {}
// ANCHOR_END: TransformRequirement

/// The methods to create animations for `T` that satisfies [`TransformRequirement`]
pub trait TransformAnim<T: TransformRequirement + 'static> {
    /// Create a [`Transform`] anim with a func.
    fn transform<F: Fn(&mut T)>(self, f: F) -> AnimationSpan<T>;
    /// Create a [`Transform`] anim from src.
    fn transform_from(self, src: T) -> AnimationSpan<T>;
    /// Create a [`Transform`] anim to dst.
    fn transform_to(self, dst: T) -> AnimationSpan<T>;
}

impl<T: TransformRequirement + 'static> TransformAnim<T> for T {
    fn transform<F: Fn(&mut T)>(self, f: F) -> AnimationSpan<T> {
        let mut dst = self.clone();
        (f)(&mut dst);
        Transform::new(self.clone(), dst)
            .into_animation_span()
            .with_rate_func(smooth)
    }
    fn transform_from(self, s: T) -> AnimationSpan<T> {
        Transform::new(s, self.clone())
            .into_animation_span()
            .with_rate_func(smooth)
    }
    fn transform_to(self, d: T) -> AnimationSpan<T> {
        Transform::new(self.clone(), d)
            .into_animation_span()
            .with_rate_func(smooth)
    }
}

// ANCHOR: Transform
/// Transform Anim
pub struct Transform<T: TransformRequirement> {
    src: T,
    dst: T,
    aligned_src: T,
    aligned_dst: T,
}
// ANCHOR_END: Transform

impl<T: TransformRequirement> Transform<T> {
    /// Constructor
    pub fn new(src: T, dst: T) -> Self {
        let mut aligned_src = src.clone();
        let mut aligned_dst = dst.clone();
        if !aligned_src.is_aligned(&aligned_dst) {
            aligned_src.align_with(&mut aligned_dst);
        }
        Self {
            src,
            dst,
            aligned_src,
            aligned_dst,
        }
    }
}

// ANCHOR: Transform-EvalDynamic
impl<T: TransformRequirement> EvalDynamic<T> for Transform<T> {
    fn eval_alpha(&self, alpha: f64) -> T {
        if alpha == 0.0 {
            self.src.clone()
        } else if 0.0 < alpha && alpha < 1.0 {
            self.aligned_src.lerp(&self.aligned_dst, alpha)
        } else if alpha == 1.0 {
            self.dst.clone()
        } else {
            unreachable!()
        }
    }
}
// ANCHOR_END: Transform-EvalDynamic