How to tween both translation and scale of Transform simultaneously?

[inodentry]

This was pretty easy to do with the old bevy_easings crate, that this crate was based on, because it dealt with the entire Transform all at once.

Here, you are providing separate "lenses" for translation, rotation, and scale, and all of them set the generic parameter on Lens<T> to T: Transform, meaning that I cannot add multiple to the same entity simultaneously. There is no lens for working with the whole transform. :(

So have you made it impossible to tween between two Transforms? Only leaving the possibility to operate on one field at a time?

[djeedai]

because it dealt with the entire Transform all at once.

The animators always deal with the entire Component at once since that's what the world fetch via the system gets them.

you are providing separate "lenses" for translation, rotation, and scale

The crate is providing example lenses, yes :)

There is no lens for working with the whole transform.

Here:

#[derive(Debug, Copy, Clone, PartialEq)]
pub struct TransformLens {
    /// Start value.
    pub start: Transform,
    /// End value.
    pub end: Transform,
}

impl Lens<Transform> for TransformLens {
    fn lerp(&mut self, target: &mut Transform, ratio: f32) {
        target = ...;
    }
}

So have you made it impossible to tween between two Transforms?

Out of the box, there's no provided lens for the whole Transform indeed, because I don't think that's such a common case that this is needed. As shown above it's trivial to make your own though, and is the encouraged way for more advanced usage.

[djeedai]

@inodentry can I close this or do you have any other question?