PbrMotion, motion traits, and new crate bevy_vello_graphics

[nixon-voxell]

Follow up on #39

Changelog

TL;DR

• Add PbrMotion & BuildPbrMotionExt
• Replace build_vector! macro with BuildVectorMotionExt
• Add motion traits
• Separate shapes into new crate bevy_vello_graphics

PbrMotion & BuildPbrMotionExt

let mut pbr_motion = commands.build_pbr(transform, mesh_handle.clone(), material.clone());
let action = act!(
    (pbr_motion.id, Transform),
    start = { pbr_motion.transform }.scale,
    end = Vec3::splat(0.9),
);

Replace build_vector! macro with BuildVectorMotionExt

let mut line = commands.build_svector(
    Transform::default(),
    VelloLine::new(DVec2::new(-100.0, 0.0), DVec2::new(100.0, 0.0)),
    Stroke::default().with_brush(Brush::from_color(palette.get(ColorKey::Base8))),
);

let mut rect = commands.build_fsvector(
    Transform::default(),
    VelloRect::new(100.0, 100.0),
    Fill::new().with_color(palette.get(ColorKey::Blue)),
    Stroke::new(4.0).with_color(palette.get(ColorKey::Blue) * 1.5),
);

Motion traits

3 new motion traits are introduced:

• TransformMotion with attribute - transform
• FillMotion with attribute - fill
• StrokeMotion with attribute - stroke

The attributes are used to indicate the identifier of the animated field (e.g. transform: Transform for TransformMotion).

Each of these traits must also implements the GetId trait.

Example:

#[derive(FillMotion, StrokeMotion, TransformMotion, GetId, Clone)]
pub struct FSVectorMotion<T> {
    #[id]
    pub id: Entity,
    #[transform]
    pub transform: Transform,
    pub vector: T,
    #[fill]
    pub fill: Fill,
    #[stroke]
    pub stroke: Stroke,
}

These motion traits provides default implementations of action creator functions that can be called without using the act! macro:

let mut line = commands.build_svector(
    Transform::default(),
    VelloLine::new(DVec2::new(-100.0, 0.0), DVec2::new(100.0, 0.0)),
    Stroke::default().with_brush(Brush::from_color(palette.get(ColorKey::Base8))),
);

let sequence = play!(
    commands,
    line.to_width(10.0).animate(1.0),
    line.to_color(Color::BLUE).animate(1.0),
)
.all();

New bevy_vello_graphics crate!

Vector shapes are now separated into a new crate. You can now use them separately from MotionGfx (even if you only need them to be static)!

Shapes include:

• Line
• Circle
• Rect
• Bezier Path

And drawing related components:

• Brush
• Fill
• Stroke

As well as their builder systems which rebuilds these shapes when they are being mutated (using Bevy's filter Changed<T>):

• build_vector