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.
66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
use bevy::prelude::*;
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/// This example illustrates how to create parent->child relationships between entities how parent
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/// transforms are propagated to their descendants
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fn main() {
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App::new()
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.insert_resource(Msaa { samples: 4 })
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(rotator_system)
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.run();
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}
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/// this component indicates what entities should rotate
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#[derive(Component)]
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struct Rotator;
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/// rotates the parent, which will result in the child also rotating
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fn rotator_system(time: Res<Time>, mut query: Query<&mut Transform, With<Rotator>>) {
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for mut transform in query.iter_mut() {
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transform.rotation *= Quat::from_rotation_x(3.0 * time.delta_seconds());
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}
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}
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/// set up a simple scene with a "parent" cube and a "child" cube
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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let cube_handle = meshes.add(Mesh::from(shape::Cube { size: 2.0 }));
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let cube_material_handle = materials.add(StandardMaterial {
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base_color: Color::rgb(0.8, 0.7, 0.6),
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..default()
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});
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// parent cube
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commands
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.spawn_bundle(PbrBundle {
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mesh: cube_handle.clone(),
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material: cube_material_handle.clone(),
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transform: Transform::from_xyz(0.0, 0.0, 1.0),
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..default()
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})
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.insert(Rotator)
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.with_children(|parent| {
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// child cube
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parent.spawn_bundle(PbrBundle {
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mesh: cube_handle,
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material: cube_material_handle,
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transform: Transform::from_xyz(0.0, 0.0, 3.0),
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..default()
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});
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});
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// light
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commands.spawn_bundle(PointLightBundle {
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transform: Transform::from_xyz(4.0, 5.0, -4.0),
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..default()
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});
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// camera
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commands.spawn_bundle(PerspectiveCameraBundle {
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transform: Transform::from_xyz(5.0, 10.0, 10.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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}
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