Repeat any arbitrary Sequence

[musjj]

It would be nice if you can repeat any arbitrary sequence, like other bevy tweening plugins:

For example:

flow(&[
    commands.play(transform_motions[c].translate_add(Vec3::X), 1.0),
    commands.play(transform_motions[c].scale_to(Vec3::splat(0.9)), 1.0),
])
.with_repeat_count(repeat::finite(2)) // or infinite
.with_repeat_style(repeat::style::mirrored) // this will flip the animation direction on every loop

You can manually do this, but metadatas will make it easy to mix and match repeat counts/styles in a single sequence.

[nixon-voxell]

This is extremely important feature, will be supported in the future! I am currently doing some major changes to the Action creation API at the moment for a more robust use case. (because right now, you can only rely on actions that our Motion APi provides, and hardly any control over how things are being interpolated.

[musjj]

Nice. Btw, I'm liking how the new macros are turning out. I tried playing around with it, but it looks likes that completions are starting to show some cracks. For example:

let sequence = play!(
    commands,
    act!(
        (cube_ids[c], Transform),
        start = {transforms[c]}.scale,
        end = Vec3::splat(0.9),
    )
    .with_ease(ease::circ::ease_in_out)
    .animate(1.0),
    |
);

When you start typing with your cursor at |, completions no longer work. It works perfectly for commands and the first act!, but breaks down afterwards.

[nixon-voxell]

@musjj Thanks for trying it out! I am looking to resolve this issue by replacing the play! macro with sth like this instead!

let sequence = [
    act!(
        (cube_ids[c], Transform),
        start = {transforms[c]}.scale,
        end = Vec3::splat(0.9),
    )
    .with_ease(ease::circ::ease_in_out)
    .animate(1.0),
    act!(
        (cube_ids[c], Transform),
        start = {transforms[c]}.transform,
        end = Transform::default(),
    )
    .with_ease(ease::circ::ease_in_out)
    .animate(1.0),
]
.play(&mut commands)
.all();

So we are now back to rust land and completions just works! :D I am also a huge fan of autocomplete & autoformat working hahahaha

[nixon-voxell]

Hmm after some experimentation, I don't think I can achieve what I mentioned above, because all types inside an array must be the same, the best I can do is sth like this:

let sequence = [
    act!(
        (cube_ids[c], Transform),
        start = {transforms[c]}.scale,
        end = Vec3::splat(0.9),
    )
    .with_ease(ease::circ::ease_in_out)
    .play(&mut commands, 1.0),
    act!(
        (cube_ids[c], Transform),
        start = {transforms[c]}.transform,
        end = Transform::default(),
    )
    .with_ease(ease::circ::ease_in_out)
    .play(&mut commands, 1.0),
]
.all();

Each play() function converts the Action to Sequence but the downside is that we will need to retype &mut commands for every action...

But I do wonder how does bevy managed to support this kind of thing in the add_systems function, basically a tuple of functions that are completely different from one another...

@musjj

[nixon-voxell]

ahh I found it, maybe it would be useful to use this all_tuples! macro!

macro_rules! impl_system_collection {
    ($(($param: ident, $sys: ident)),*) => {
        impl<$($param, $sys),*> IntoSystemConfigs<(SystemConfigTupleMarker, $($param,)*)> for ($($sys,)*)
        where
            $($sys: IntoSystemConfigs<$param>),*
        {
            #[allow(non_snake_case)]
            fn into_configs(self) -> SystemConfigs {
                let ($($sys,)*) = self;
                SystemConfigs::Configs {
                    configs: vec![$($sys.into_configs(),)*],
                    collective_conditions: Vec::new(),
                    chained: Chain::No,
                }
            }
        }
    }
}

all_tuples!(impl_system_collection, 1, 20, P, S);

[nixon-voxell]

Hey I came up with something much simpler now haha 🤣

let sequence = commands
    .add_motion(
        cube.to_scale(Vec3::splat(0.9))
            .with_ease(circ_ease)
            .animate(1.0),
    )
    .add_motion(
        cube.to_translation_x(cube.transform.translation.x + 1.0)
            .with_ease(circ_ease)
            .animate(1.0),
    )
    .add_motion(
        cube.to_rotation(Quat::from_euler(
            EulerRot::XYZ,
            0.0,
            f32::to_radians(90.0),
            0.0,
        ))
        .with_ease(circ_ease)
        .animate(1.0),
    )
    .all();

Don't mind the to_translation_x or to_rotation, you can easily replace them with the original act! macro as well. These are just motion trait functions that I created recently to simplify the creation of commonly used Actions.