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rust-bevy-test/.gitignore

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+/target

rust-bevy-test/Cargo.toml

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+[package]
+name = "bevy_test"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+bevy = "0.17"
+rand = "0.9"

rust-bevy-test/src/main.rs

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+use bevy::prelude::*;
+use bevy::window::PrimaryWindow;
+
+const ENEMY_SPEED: f32 = 100.0;
+const ENEMY_SIZE: f32 = 40.0;
+
+const HOME_X: f32 = -400.0;
+const SPAWN_X: f32 = 400.0;
+
+#[derive(Component)]
+struct Enemy;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_systems(Startup, setup)
+        .add_systems(
+            Update,
+            (
+                spawn_enemies,
+                move_enemies,
+                click_enemies,
+            ),
+        )
+        .run();
+}
+
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2d);
+
+    // Дом
+    commands.spawn((
+        Sprite {
+            color: Color::srgb(0.2, 0.8, 0.2),
+            custom_size: Some(Vec2::new(20.0, 600.0)),
+            ..default()
+        },
+        Transform::from_xyz(HOME_X, 0.0, 0.0),
+    ));
+
+    // Спавн
+    commands.spawn((
+        Sprite {
+            color: Color::srgb(0.8, 0.2, 0.2),
+            custom_size: Some(Vec2::new(20.0, 600.0)),
+            ..default()
+        },
+        Transform::from_xyz(SPAWN_X, 0.0, 0.0),
+    ));
+}
+
+fn spawn_enemies(
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    time: Res<Time>,
+) {
+    // Пока просто спавним врага каждые 2 секунды.
+    //
+    // Это временный вариант.
+    // Позже сделаем нормальный Timer как отдельный ресурс.
+
+    let seconds = time.elapsed_secs();
+
+    if (seconds % 2.0) < 0.02 {
+        let y = rand::random_range(-250.0..250.0);
+
+        let texture = asset_server.load("test.png");
+
+        commands.spawn((
+            Sprite {
+                image: texture,
+                custom_size: Some(Vec2::splat(ENEMY_SIZE)),
+                ..default()
+            },
+            Transform::from_xyz(SPAWN_X, y, 1.0),
+            Enemy,
+        ));
+    }
+}
+
+fn move_enemies(
+    mut commands: Commands,
+    mut enemies: Query<(Entity, &mut Transform), With<Enemy>>,
+    time: Res<Time>,
+) {
+    for (entity, mut transform) in &mut enemies {
+        transform.translation.x -= ENEMY_SPEED * time.delta_secs();
+
+        // Враг дошёл до дома
+        if transform.translation.x <= HOME_X {
+            commands.entity(entity).despawn();
+        }
+    }
+}
+
+fn click_enemies(
+    mouse: Res<ButtonInput<MouseButton>>,
+    windows: Query<&Window, With<PrimaryWindow>>,
+    enemies: Query<(Entity, &Transform), With<Enemy>>,
+    mut commands: Commands,
+) {
+    if !mouse.just_pressed(MouseButton::Left) {
+        return;
+    }
+
+    let window = windows.single().unwrap();
+
+    let Some(cursor) = window.cursor_position() else {
+        return;
+    };
+
+    // Переводим координаты мыши из координат окна
+    // в координаты игрового мира.
+    let mouse_world = Vec2::new(
+        cursor.x - window.width() / 2.0,
+        window.height() / 2.0 - cursor.y,
+    );
+
+    for (entity, transform) in &enemies {
+        let enemy_position = transform.translation.truncate();
+
+        let distance = mouse_world.distance(enemy_position);
+
+        if distance < ENEMY_SIZE / 2.0 {
+            commands.entity(entity).despawn();
+        }
+    }
+}