mirror of
https://github.com/bevyengine/bevy
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# Objective
Animating component fields requires too much boilerplate at the moment:
```rust
#[derive(Reflect)]
struct FontSizeProperty;
impl AnimatableProperty for FontSizeProperty {
type Component = TextFont;
type Property = f32;
fn get_mut(component: &mut Self::Component) -> Option<&mut Self::Property> {
Some(&mut component.font_size)
}
}
animation_clip.add_curve_to_target(
animation_target_id,
AnimatableKeyframeCurve::new(
[0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0]
.into_iter()
.zip([24.0, 80.0, 24.0, 80.0, 24.0, 80.0, 24.0]),
)
.map(AnimatableCurve::<FontSizeProperty, _>::from_curve)
.expect("should be able to build translation curve because we pass in valid samples"),
);
```
## Solution
This adds `AnimatedField` and an `animated_field!` macro, enabling the
following:
```rust
animation_clip.add_curve_to_target(
animation_target_id,
AnimatableCurve::new(
animated_field!(TextFont::font_size),
AnimatableKeyframeCurve::new(
[0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0]
.into_iter()
.zip([24.0, 80.0, 24.0, 80.0, 24.0, 80.0, 24.0]),
)
.expect(
"should be able to build translation curve because we pass in valid samples",
),
),
);
```
This required reworking the internals a bit, namely stripping out a lot
of the `Reflect` usage, as that implementation was fundamentally
incompatible with the `AnimatedField` pattern. `Reflect` was being used
in this context just to downcast traits. But we can get downcasting
behavior without the `Reflect` requirement by implementing `Downcast`
for `AnimationCurveEvaluator`.
This also reworks "evaluator identity" to support either a (Component /
Field) pair, or a TypeId. This allows properties to reuse evaluators,
even if they have different accessor methods. The "contract" here is
that for a given (Component / Field) pair, the accessor will return the
same value. Fields are identified by their Reflect-ed field index. The
(TypeId, usize) is prehashed and cached to optimize for lookup speed.
This removes the built-in hard-coded TranslationCurve / RotationCurve /
ScaleCurve in favor of AnimatableField.
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
52 lines
1.7 KiB
TOML
52 lines
1.7 KiB
TOML
[package]
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name = "bevy_animation"
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version = "0.15.0-dev"
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edition = "2021"
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description = "Provides animation functionality for Bevy Engine"
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homepage = "https://bevyengine.org"
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repository = "https://github.com/bevyengine/bevy"
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license = "MIT OR Apache-2.0"
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keywords = ["bevy"]
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[dependencies]
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# bevy
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bevy_app = { path = "../bevy_app", version = "0.15.0-dev" }
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bevy_asset = { path = "../bevy_asset", version = "0.15.0-dev" }
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bevy_color = { path = "../bevy_color", version = "0.15.0-dev" }
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bevy_core = { path = "../bevy_core", version = "0.15.0-dev" }
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bevy_derive = { path = "../bevy_derive", version = "0.15.0-dev" }
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bevy_log = { path = "../bevy_log", version = "0.15.0-dev" }
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bevy_math = { path = "../bevy_math", version = "0.15.0-dev" }
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bevy_reflect = { path = "../bevy_reflect", version = "0.15.0-dev", features = [
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"bevy",
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"petgraph",
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] }
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bevy_render = { path = "../bevy_render", version = "0.15.0-dev" }
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bevy_time = { path = "../bevy_time", version = "0.15.0-dev" }
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bevy_utils = { path = "../bevy_utils", version = "0.15.0-dev" }
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bevy_ecs = { path = "../bevy_ecs", version = "0.15.0-dev" }
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bevy_transform = { path = "../bevy_transform", version = "0.15.0-dev" }
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bevy_hierarchy = { path = "../bevy_hierarchy", version = "0.15.0-dev" }
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# other
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petgraph = { version = "0.6", features = ["serde-1"] }
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ron = "0.8"
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serde = "1"
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blake3 = { version = "1.0" }
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downcast-rs = "1.2.0"
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derive_more = { version = "1", default-features = false, features = [
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"error",
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"from",
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"display",
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] }
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either = "1.13"
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thread_local = "1"
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uuid = { version = "1.7", features = ["v4"] }
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smallvec = "1"
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[lints]
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workspace = true
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[package.metadata.docs.rs]
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rustdoc-args = ["-Zunstable-options", "--generate-link-to-definition"]
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all-features = true
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