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https://github.com/bevyengine/bevy
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c893b99224
This can be your 6 months post-christmas present. # Objective - Make `.system` optional - yeet - It's ugly - Alternative title: `.system` is dead; long live `.system` - **yeet** ## Solution - Use a higher ranked lifetime, and some trait magic. N.B. This PR does not actually remove any `.system`s, except in a couple of examples. Once this is merged we can do that piecemeal across crates, and decide on syntax for labels.
96 lines
3 KiB
Rust
96 lines
3 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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sprite::SpriteSettings,
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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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pub struct PrintTimer(Timer);
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pub struct Position(Transform);
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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::build()
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.add_plugin(LogDiagnosticsPlugin::default())
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.add_plugin(FrameTimeDiagnosticsPlugin::default())
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.insert_resource(SpriteSettings {
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// NOTE: this is an experimental feature that doesn't work in all cases
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frustum_culling_enabled: true,
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})
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(tick.system().label("Tick"))
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.add_system(move_camera.system().after("Tick"))
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.run()
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}
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fn setup(
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mut commands: Commands,
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assets: Res<AssetServer>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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) {
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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 = materials.add(assets.load("branding/icon.png").into());
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commands
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.spawn()
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.insert_bundle(OrthographicCameraBundle::new_2d())
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.insert(PrintTimer(Timer::from_seconds(1.0, true)))
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.insert(Position(Transform::from_translation(Vec3::new(
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0.0, 0.0, 1000.0,
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))));
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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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commands.spawn().insert_bundle(SpriteBundle {
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material: 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::new(tile_size),
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..Default::default()
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});
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}
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}
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}
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fn move_camera(time: Res<Time>, mut query: Query<(&mut Transform, &mut Position)>) {
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for (mut transform, mut position) in query.iter_mut() {
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position
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.0
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.rotate(Quat::from_rotation_z(time.delta_seconds() * 0.5));
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position.0 =
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position.0 * Transform::from_translation(Vec3::X * CAMERA_SPEED * time.delta_seconds());
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transform.translation = position.0.translation;
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transform.rotation *= Quat::from_rotation_z(time.delta_seconds() / 2.0);
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}
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}
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fn tick(time: Res<Time>, sprites: Query<&Sprite>, mut query: Query<&mut PrintTimer>) {
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for mut timer in query.iter_mut() {
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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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}
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