bevy/examples/3d/parenting.rs
ira 4847f7e3ad Update codebase to use IntoIterator where possible. (#5269)
Remove unnecessary calls to `iter()`/`iter_mut()`.
Mainly updates the use of queries in our code, docs, and examples.

```rust
// From
for _ in list.iter() {
for _ in list.iter_mut() {

// To
for _ in &list {
for _ in &mut list {
```

We already enable the pedantic lint [clippy::explicit_iter_loop](https://rust-lang.github.io/rust-clippy/stable/) inside of Bevy. However, this only warns for a few known types from the standard library.

## Note for reviewers
As you can see the additions and deletions are exactly equal.
Maybe give it a quick skim to check I didn't sneak in a crypto miner, but you don't have to torture yourself by reading every line.
I already experienced enough pain making this PR :) 


Co-authored-by: devil-ira <justthecooldude@gmail.com>
2022-07-11 15:28:50 +00:00

65 lines
1.9 KiB
Rust

//! Illustrates how to create parent-child relationships between entities and how parent transforms
//! are propagated to their descendants.
use bevy::prelude::*;
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_startup_system(setup)
.add_system(rotator_system)
.run();
}
/// this component indicates what entities should rotate
#[derive(Component)]
struct Rotator;
/// rotates the parent, which will result in the child also rotating
fn rotator_system(time: Res<Time>, mut query: Query<&mut Transform, With<Rotator>>) {
for mut transform in &mut query {
transform.rotate_x(3.0 * time.delta_seconds());
}
}
/// set up a simple scene with a "parent" cube and a "child" cube
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
let cube_handle = meshes.add(Mesh::from(shape::Cube { size: 2.0 }));
let cube_material_handle = materials.add(StandardMaterial {
base_color: Color::rgb(0.8, 0.7, 0.6),
..default()
});
// parent cube
commands
.spawn_bundle(PbrBundle {
mesh: cube_handle.clone(),
material: cube_material_handle.clone(),
transform: Transform::from_xyz(0.0, 0.0, 1.0),
..default()
})
.insert(Rotator)
.with_children(|parent| {
// child cube
parent.spawn_bundle(PbrBundle {
mesh: cube_handle,
material: cube_material_handle,
transform: Transform::from_xyz(0.0, 0.0, 3.0),
..default()
});
});
// light
commands.spawn_bundle(PointLightBundle {
transform: Transform::from_xyz(4.0, 5.0, -4.0),
..default()
});
// camera
commands.spawn_bundle(Camera3dBundle {
transform: Transform::from_xyz(5.0, 10.0, 10.0).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
}