7d40e3ec87
# Objective Continue migration of bevy APIs to required components, following guidance of https://hackmd.io/@bevy/required_components/ ## Solution - Make `Sprite` require `Transform` and `Visibility` and `SyncToRenderWorld` - move image and texture atlas handles into `Sprite` - deprecate `SpriteBundle` - remove engine uses of `SpriteBundle` ## Testing ran cargo tests on bevy_sprite and tested several sprite examples. --- ## Migration Guide Replace all uses of `SpriteBundle` with `Sprite`. There are several new convenience constructors: `Sprite::from_image`, `Sprite::from_atlas_image`, `Sprite::from_color`. WARNING: use of `Handle<Image>` and `TextureAtlas` as components on sprite entities will NO LONGER WORK. Use the fields on `Sprite` instead. I would have removed the `Component` impls from `TextureAtlas` and `Handle<Image>` except it is still used within ui. We should fix this moving forward with the migration.
90 lines
3.0 KiB
Rust
90 lines
3.0 KiB
Rust
//! Creates a hierarchy of parents and children entities.
|
|
|
|
use std::f32::consts::*;
|
|
|
|
use bevy::{color::palettes::css::*, prelude::*};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, rotate)
|
|
.run();
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
commands.spawn(Camera2d);
|
|
let texture = asset_server.load("branding/icon.png");
|
|
|
|
// Spawn a root entity with no parent
|
|
let parent = commands
|
|
.spawn((
|
|
Sprite::from_image(texture.clone()),
|
|
Transform::from_scale(Vec3::splat(0.75)),
|
|
))
|
|
// With that entity as a parent, run a lambda that spawns its children
|
|
.with_children(|parent| {
|
|
// parent is a ChildBuilder, which has a similar API to Commands
|
|
parent.spawn((
|
|
Transform::from_xyz(250.0, 0.0, 0.0).with_scale(Vec3::splat(0.75)),
|
|
Sprite {
|
|
image: texture.clone(),
|
|
color: BLUE.into(),
|
|
..default()
|
|
},
|
|
));
|
|
})
|
|
// Store parent entity for next sections
|
|
.id();
|
|
|
|
// Another way is to use the add_child function to add children after the parent
|
|
// entity has already been spawned.
|
|
let child = commands
|
|
.spawn((
|
|
Sprite {
|
|
image: texture,
|
|
color: LIME.into(),
|
|
..default()
|
|
},
|
|
Transform::from_xyz(0.0, 250.0, 0.0).with_scale(Vec3::splat(0.75)),
|
|
))
|
|
.id();
|
|
|
|
// Add child to the parent.
|
|
commands.entity(parent).add_child(child);
|
|
}
|
|
|
|
// A simple system to rotate the root entity, and rotate all its children separately
|
|
fn rotate(
|
|
mut commands: Commands,
|
|
time: Res<Time>,
|
|
mut parents_query: Query<(Entity, &Children), With<Sprite>>,
|
|
mut transform_query: Query<&mut Transform, With<Sprite>>,
|
|
) {
|
|
for (parent, children) in &mut parents_query {
|
|
if let Ok(mut transform) = transform_query.get_mut(parent) {
|
|
transform.rotate_z(-PI / 2. * time.delta_seconds());
|
|
}
|
|
|
|
// To iterate through the entities children, just treat the Children component as a Vec
|
|
// Alternatively, you could query entities that have a Parent component
|
|
for child in children {
|
|
if let Ok(mut transform) = transform_query.get_mut(*child) {
|
|
transform.rotate_z(PI * time.delta_seconds());
|
|
}
|
|
}
|
|
|
|
// To demonstrate removing children, we'll remove a child after a couple of seconds.
|
|
if time.elapsed_seconds() >= 2.0 && children.len() == 2 {
|
|
let child = children.last().unwrap();
|
|
commands.entity(*child).despawn_recursive();
|
|
}
|
|
|
|
if time.elapsed_seconds() >= 4.0 {
|
|
// This will remove the entity from its parent's list of children, as well as despawn
|
|
// any children the entity has.
|
|
commands.entity(parent).despawn_recursive();
|
|
}
|
|
}
|
|
}
|