Help with custom Lens<TextureAtlasSprite>

[njelly]

I have successfully implemented a custom lens for a Transform component (this "orbits" a transform around a point at a distance):

struct TranslateAroundLens {
    start_rot: Quat,
    end_rot: Quat,
    distance: f32,
    point: Vec3,
}

impl Lens<Transform> for TranslateAroundLens {
    fn lerp(self: &mut TranslateAroundLens, target: &mut Transform, ratio: f32) {
        let rot = self.start_rot.lerp(self.end_rot, ratio);
        target.translation = rot.mul_vec3(Vec3::new(self.distance, 0., 0.)) + self.point;
    }
}

Now I want to create Lens and have the tween run on the same entity, but I can't get it to work at all (should be identical to SpriteColorLens?). It simply doesn't seem to run, although I can see that the Animator is definitely getting added to my entity:

struct TextureAtlasSpriteColorLens {
    start: Color,
    end: Color,
}

impl Lens<TextureAtlasSprite> for TextureAtlasSpriteColorLens {
    fn lerp(self: &mut TextureAtlasSpriteColorLens, target: &mut TextureAtlasSprite, ratio: f32) {
        let start: Vec4 = self.start.into();
        let end: Vec4 = self.end.into();
        let value = start.lerp(end, ratio);
        target.color = value.into();
        println!("this never prints!");
    }
}

Here is the pastebin for my full module:
https://pastebin.com/raw/Rmhsmqiv

[njelly]

So I realize now that I need to add a component_animator_system::<TextureAtlasSprite> to my app, however this exists in the plugin module, which is private, so I'm not sure how this is intended to be implemented? Seems like this should not be private, but the solution for now is to just copy+paste that function definition into my code base and use it there.

[djeedai]

Sorry yes you need that system which is public : https://docs.rs/bevy_tweening/latest/bevy_tweening/fn.component_animator_system.html

bevy_tweening/src/lib.rs

Line 165 in 2c9e4a2

pub use plugin::{component_animator_system, AnimationSystem, TweeningPlugin};

[njelly]

So I get this error when I do that, which is why I'm wondering if this is a mistake or if I'm missing something else? Either way I solved it by just copying the definition of component_animator_system into my own codebase and adding my systems in my own plugin

module `plugin` is private
private module rustc[E0603](https://doc.rust-lang.org/error-index.html#E0603)