81 lines
1.4 KiB
Rust
81 lines
1.4 KiB
Rust
use bevy::{
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prelude::*,
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};
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#[derive(Component,Debug)]
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struct Pos(Vec2);
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#[derive(Component,Debug)]
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struct Ray(Vec2);
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#[derive(Component,Debug)]
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struct Col(Color);
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#[derive(Component,Debug)]
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struct Size(f32);
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, (animate, rand_color, gizmos))
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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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) {
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commands.spawn(Camera2dBundle {
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transform: Transform::from_xyz(250.0, 0.0, 0.0),
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..default()
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});
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commands.spawn((
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Pos(Vec2::new(0.0, 0.0)),
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Ray(Vec2::new(100.0, 5.0)),
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Col(Color::rgba(1.0, 0.0, 1.0, 1.0)),
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Size(10.0)
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));
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commands.spawn((
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Pos(Vec2::new(0.0, 0.0)),
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Ray(Vec2::new(200.0, 1.0)),
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Col(Color::rgba(1.0, 1.0, 0.0, 1.0)),
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Size(20.0)
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));
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}
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fn animate(
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time: Res<Time>,
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mut query: Query<(&mut Pos, &Ray)>
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) {
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let t = time.elapsed_seconds();
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for (mut pos, ray) in &mut query {
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pos.0.x = (ray.0.y*t).cos() * ray.0.x;
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pos.0.y = (ray.0.y*t).sin() * ray.0.x;
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}
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}
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fn rand_color(
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time: Res<Time>,
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mut query: Query<&mut Col>
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) {
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let t = time.delta_seconds();
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for mut col in &mut query {
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if let Color::Rgba{ ref mut red, .. } = col.0 {
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*red += t;
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if *red > 1.0 {
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*red = 0.0;
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}
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}
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}
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}
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fn gizmos(
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mut gizmos: Gizmos,
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query: Query<(&Pos,&Col,&Size)>
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) {
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for (Pos(pos), Col(color), Size(size)) in &query {
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gizmos.circle_2d(*pos, *size, *color);
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}
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}
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