b6a647cc01
Adds a `default()` shorthand for `Default::default()` ... because life is too short to constantly type `Default::default()`.
```rust
use bevy::prelude::*;
#[derive(Default)]
struct Foo {
bar: usize,
baz: usize,
}
// Normally you would do this:
let foo = Foo {
bar: 10,
..Default::default()
};
// But now you can do this:
let foo = Foo {
bar: 10,
..default()
};
```
The examples have been adapted to use `..default()`. I've left internal crates as-is for now because they don't pull in the bevy prelude, and the ergonomics of each case should be considered individually.
86 lines
2.6 KiB
Rust
86 lines
2.6 KiB
Rust
use bevy::prelude::*;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(animate_translation)
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.add_system(animate_rotation)
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.add_system(animate_scale)
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.run();
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}
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#[derive(Component)]
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struct AnimateTranslation;
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#[derive(Component)]
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struct AnimateRotation;
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#[derive(Component)]
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struct AnimateScale;
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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let font = asset_server.load("fonts/FiraSans-Bold.ttf");
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let text_style = TextStyle {
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font,
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font_size: 60.0,
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color: Color::WHITE,
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};
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let text_alignment = TextAlignment {
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vertical: VerticalAlign::Center,
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horizontal: HorizontalAlign::Center,
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};
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// 2d camera
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commands.spawn_bundle(OrthographicCameraBundle::new_2d());
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// Demonstrate changing translation
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commands
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.spawn_bundle(Text2dBundle {
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text: Text::with_section("translation", text_style.clone(), text_alignment),
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..default()
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})
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.insert(AnimateTranslation);
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// Demonstrate changing rotation
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commands
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.spawn_bundle(Text2dBundle {
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text: Text::with_section("rotation", text_style.clone(), text_alignment),
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..default()
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})
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.insert(AnimateRotation);
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// Demonstrate changing scale
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commands
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.spawn_bundle(Text2dBundle {
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text: Text::with_section("scale", text_style, text_alignment),
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..default()
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})
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.insert(AnimateScale);
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}
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fn animate_translation(
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time: Res<Time>,
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mut query: Query<&mut Transform, (With<Text>, With<AnimateTranslation>)>,
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) {
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for mut transform in query.iter_mut() {
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transform.translation.x = 100.0 * time.seconds_since_startup().sin() as f32 - 400.0;
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transform.translation.y = 100.0 * time.seconds_since_startup().cos() as f32;
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}
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}
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fn animate_rotation(
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time: Res<Time>,
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mut query: Query<&mut Transform, (With<Text>, With<AnimateRotation>)>,
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) {
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for mut transform in query.iter_mut() {
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transform.rotation = Quat::from_rotation_z(time.seconds_since_startup().cos() as f32);
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}
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}
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fn animate_scale(
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time: Res<Time>,
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mut query: Query<&mut Transform, (With<Text>, With<AnimateScale>)>,
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) {
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// Consider changing font-size instead of scaling the transform. Scaling a Text2D will scale the
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// rendered quad, resulting in a pixellated look.
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for mut transform in query.iter_mut() {
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transform.translation = Vec3::new(400.0, 0.0, 0.0);
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transform.scale = Vec3::splat((time.seconds_since_startup().sin() as f32 + 1.1) * 2.0);
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}
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}
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