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105 lines
2.9 KiB
Rust
105 lines
2.9 KiB
Rust
use bevy::{color::palettes::css::*, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.insert_resource(ClearColor(WHITE.into()))
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.add_event::<CameraMovement>()
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.add_systems(Startup, setup_2d)
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.add_systems(Update, (move_camera, track_camera_movement, parallax))
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.run();
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}
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#[derive(Component)]
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struct ParallaxDistance(f32);
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fn setup_2d(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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) {
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commands.spawn((
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Camera2d,
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AmbientLight {
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brightness: 160.0,
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..default()
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},
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));
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commands.spawn((
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Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
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MeshMaterial2d(materials.add(Color::from(RED))),
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Transform::from_xyz(0.0, 0.0, -1.0),
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ParallaxDistance(1.0),
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children![(
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Text2d::new("Parallax Distance: 1"),
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TextColor(BLACK.into()),
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Transform::from_xyz(150.0, 50.0, 0.0)
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)],
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));
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commands.spawn((
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Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
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MeshMaterial2d(materials.add(Color::from(GREEN))),
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Transform::from_xyz(0.0, 0.0, -5.0),
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ParallaxDistance(5.0),
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children![(
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Text2d::new("Parallax Distance: 5"),
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TextColor(BLACK.into()),
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Transform::from_xyz(150.0, 0.0, 0.0)
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)],
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));
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commands.spawn((
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Mesh2d(meshes.add(Rectangle::new(100.0, 100.0))),
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MeshMaterial2d(materials.add(Color::from(BLUE))),
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Transform::from_xyz(0.0, 0.0, -10.0),
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ParallaxDistance(10.0),
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children![(
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Text2d::new("Parallax Distance: 10"),
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TextColor(BLACK.into()),
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Transform::from_xyz(150.0, -50.0, 0.0)
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)],
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));
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}
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fn move_camera(keys: Res<ButtonInput<KeyCode>>, mut camera: Single<&mut Transform, With<Camera>>) {
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const SPEED: f32 = 5.0;
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if keys.pressed(KeyCode::ArrowLeft) {
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camera.translation.x += SPEED;
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} else if keys.pressed(KeyCode::ArrowRight) {
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camera.translation.x -= SPEED;
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}
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if keys.pressed(KeyCode::ArrowUp) {
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camera.translation.y -= SPEED;
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} else if keys.pressed(KeyCode::ArrowDown) {
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camera.translation.y += SPEED;
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}
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}
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#[derive(Event)]
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struct CameraMovement(Vec3);
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fn track_camera_movement(
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mut events: EventWriter<CameraMovement>,
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camera: Query<&Transform, (With<Camera>, Changed<Transform>)>,
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mut last: Local<Vec3>,
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) {
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camera.iter().for_each(|Transform { translation, .. }| {
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events.write(CameraMovement(*last - *translation));
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*last = *translation;
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});
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}
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fn parallax(
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mut events: EventReader<CameraMovement>,
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mut query: Query<(&mut Transform, &ParallaxDistance)>,
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) {
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events.read().for_each(|CameraMovement(v)| {
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query.iter_mut().for_each(|(mut t, ParallaxDistance(d))| {
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t.translation -= v / (20.0 / d);
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});
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});
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}
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