mirror of
https://github.com/bevyengine/bevy
synced 2024-11-26 22:50:19 +00:00
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.
92 lines
2.8 KiB
Rust
92 lines
2.8 KiB
Rust
use bevy::{
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diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
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math::Quat,
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prelude::*,
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render::camera::Camera,
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};
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use rand::Rng;
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const CAMERA_SPEED: f32 = 1000.0;
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/// This example is for performance testing purposes.
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/// See <https://github.com/bevyengine/bevy/pull/1492>
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fn main() {
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App::new()
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.add_plugin(LogDiagnosticsPlugin::default())
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.add_plugin(FrameTimeDiagnosticsPlugin::default())
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(print_sprite_count.label("Tick"))
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.add_system(move_camera.after("Tick"))
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.run();
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}
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fn setup(mut commands: Commands, assets: Res<AssetServer>) {
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let mut rng = rand::thread_rng();
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let tile_size = Vec2::splat(64.0);
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let map_size = Vec2::splat(320.0);
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let half_x = (map_size.x / 2.0) as i32;
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let half_y = (map_size.y / 2.0) as i32;
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let sprite_handle = assets.load("branding/icon.png");
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// Spawns the camera
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commands
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.spawn()
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.insert_bundle(OrthographicCameraBundle::new_2d())
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.insert(Transform::from_xyz(0.0, 0.0, 1000.0));
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// Builds and spawns the sprites
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let mut sprites = vec![];
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for y in -half_y..half_y {
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for x in -half_x..half_x {
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let position = Vec2::new(x as f32, y as f32);
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let translation = (position * tile_size).extend(rng.gen::<f32>());
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let rotation = Quat::from_rotation_z(rng.gen::<f32>());
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let scale = Vec3::splat(rng.gen::<f32>() * 2.0);
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sprites.push(SpriteBundle {
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texture: sprite_handle.clone(),
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transform: Transform {
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translation,
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rotation,
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scale,
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},
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sprite: Sprite {
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custom_size: Some(tile_size),
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..default()
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},
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..default()
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});
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}
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}
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commands.spawn_batch(sprites);
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}
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// System for rotating and translating the camera
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fn move_camera(time: Res<Time>, mut camera_query: Query<&mut Transform, With<Camera>>) {
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let mut camera_transform = camera_query.single_mut();
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camera_transform.rotate(Quat::from_rotation_z(time.delta_seconds() * 0.5));
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*camera_transform = *camera_transform
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* Transform::from_translation(Vec3::X * CAMERA_SPEED * time.delta_seconds());
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}
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struct PrintingTimer(Timer);
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impl Default for PrintingTimer {
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fn default() -> Self {
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Self(Timer::from_seconds(1.0, true))
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}
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}
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// System for printing the number of sprites on every tick of the timer
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fn print_sprite_count(time: Res<Time>, mut timer: Local<PrintingTimer>, sprites: Query<&Sprite>) {
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timer.0.tick(time.delta());
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if timer.0.just_finished() {
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info!("Sprites: {}", sprites.iter().count(),);
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}
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}
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