init

src/main.rs

@@ -0,0 +1,109 @@
+use bevy::{post_process::bloom::Bloom, prelude::*, sprite::Anchor};
+use rand::Rng;
+
+#[derive(Component)]
+pub struct PlayerVWBus;
+
+const PLAYER_SPEED: f32 = 100.;
+
+fn main() {
+    println!("Hello, world!");
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_systems(Startup, (setup_scene, spawn_bus, spawn_enemy))
+        .add_systems(Update, (move_player, follow_player))
+        .run();
+}
+
+fn setup_scene(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    commands.spawn((
+        Mesh2d(meshes.add(Rectangle::new(1000., 70.))),
+        MeshMaterial2d(materials.add(Color::srgb(0.2, 0.2, 0.3))),
+    ));
+
+    commands.spawn((Camera2d, Bloom::NATURAL));
+}
+
+fn spawn_bus(mut commands: Commands, asset_server: Res<AssetServer>) {
+    let texture = asset_server.load("bus/basicbus.png");
+    commands.spawn((
+        PlayerVWBus,
+        Sprite {
+            image: texture,
+            custom_size: Some(Vec2::new(192., 133.)),
+            ..default()
+        },
+        Transform::from_xyz(2., 0., 3.),
+        Anchor::CENTER,
+    ));
+}
+
+fn spawn_enemy(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    let mut rng = rand::rng();
+    for _ in 0..10 {
+        commands.spawn((
+            Mesh2d(meshes.add(Circle::new(10.))),
+            MeshMaterial2d(materials.add(Color::srgb(1.1, 0.2, 0.3))),
+            Transform::from_xyz(
+                rng.random_range(-600..600) as f32,
+                rng.random_range(-600..600) as f32,
+                1.,
+            ),
+        ));
+    }
+}
+
+fn move_player(
+    mut player: Single<&mut Transform, With<PlayerVWBus>>,
+    mut player_sprite: Single<&mut Sprite, With<PlayerVWBus>>,
+    time: Res<Time>,
+    kb_input: Res<ButtonInput<KeyCode>>,
+) {
+    let mut direction = Vec2::ZERO;
+
+    if kb_input.pressed(KeyCode::KeyW) {
+        direction.y += 1.;
+    }
+
+    if kb_input.pressed(KeyCode::KeyS) {
+        direction.y -= 1.;
+    }
+
+    if kb_input.pressed(KeyCode::KeyA) {
+        direction.x -= 1.;
+    }
+
+    if kb_input.pressed(KeyCode::KeyD) {
+        direction.x += 1.;
+    }
+
+    let move_delta = direction.normalize_or_zero() * PLAYER_SPEED * time.delta_secs();
+    player.translation += move_delta.extend(0.);
+
+    if direction.x > 0. {
+        player_sprite.flip_x = true;
+    } else if direction.x < 0. {
+        player_sprite.flip_x = false;
+    }
+}
+
+fn follow_player(
+    mut camera: Single<&mut Transform, (With<Camera2d>, Without<PlayerVWBus>)>,
+    player: Single<&Transform, (With<PlayerVWBus>, Without<Camera2d>)>,
+    time: Res<Time>,
+) {
+    let Vec3 { x, y, .. } = player.translation;
+    let direction = Vec3::new(x, y, camera.translation.z);
+
+    camera
+        .translation
+        .smooth_nudge(&direction, 10., time.delta_secs());
+}