mirror of
https://github.com/bevyengine/bevy
synced 2024-11-29 16:10:19 +00:00
7482a0d26d
Fixes #15834 ## Migration Guide The APIs of `Time`, `Timer` and `Stopwatch` have been cleaned up for consistency with each other and the standard library's `Duration` type. The following methods have been renamed: - `Stowatch::paused` -> `Stopwatch::is_paused` - `Time::elapsed_seconds` -> `Time::elasped_secs` (including `_f64` and `_wrapped` variants)
60 lines
1.8 KiB
Rust
60 lines
1.8 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_systems(Startup, setup)
|
|
.add_systems(Update, 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_secs());
|
|
}
|
|
}
|
|
|
|
/// 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(Cuboid::new(2.0, 2.0, 2.0));
|
|
let cube_material_handle = materials.add(StandardMaterial {
|
|
base_color: Color::srgb(0.8, 0.7, 0.6),
|
|
..default()
|
|
});
|
|
|
|
// parent cube
|
|
commands
|
|
.spawn((
|
|
Mesh3d(cube_handle.clone()),
|
|
MeshMaterial3d(cube_material_handle.clone()),
|
|
Transform::from_xyz(0.0, 0.0, 1.0),
|
|
Rotator,
|
|
))
|
|
.with_children(|parent| {
|
|
// child cube
|
|
parent.spawn((
|
|
Mesh3d(cube_handle),
|
|
MeshMaterial3d(cube_material_handle),
|
|
Transform::from_xyz(0.0, 0.0, 3.0),
|
|
));
|
|
});
|
|
// light
|
|
commands.spawn((PointLight::default(), Transform::from_xyz(4.0, 5.0, -4.0)));
|
|
// camera
|
|
commands.spawn((
|
|
Camera3d::default(),
|
|
Transform::from_xyz(5.0, 10.0, 10.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
));
|
|
}
|