Проектная работа

пример с состояниями

snake-game/Cargo.toml

@@ -5,8 +5,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-bevy = { version = "0.18", default-features = false, features = ["2d_bevy_render", "bevy_log", "bevy_winit", "bevy_text", "bevy_ui", "debug"] }
-# bevy = { version = "0.18" }
+bevy = "0.18"
 tracing = "0.1"
 tracing-subscriber = "0.3"
 rand = "0.10"
@@ -14,6 +13,13 @@ rand = "0.10"
 # for examples
 rand_chacha = "0.10"
 
+[profile.dev]
+opt-level = 0
+
+[profile.dev.package."*"]
+opt-level = 3
+debug = false
+
 [profile.release]
 opt-level = "z"
 lto = "fat"
@@ -23,3 +29,6 @@ panic = "abort"
 overflow-checks = false
 incremental = false
 strip = "symbols"
+
+[features]
+default = ["bevy/dynamic_linking"]

snake-game/examples/states.rs

@@ -0,0 +1,145 @@
+//! This example illustrates how to use [`States`] for high-level app control flow.
+//! States are a powerful but intuitive tool for controlling which logic runs when.
+//! You can have multiple independent states, and the [`OnEnter`] and [`OnExit`] schedules
+//! can be used to great effect to ensure that you handle setup and teardown appropriately.
+//!
+//! In this case, we're transitioning from a `Menu` state to an `InGame` state.
+
+use bevy::prelude::*;
+
+fn main() {
+    let mut app = App::new();
+    app.add_plugins(DefaultPlugins)
+        .init_state::<AppState>() // Alternatively we could use .insert_state(AppState::Menu)
+        .add_systems(Startup, setup)
+        // This system runs when we enter `AppState::Menu`, during the `StateTransition` schedule.
+        // All systems from the exit schedule of the state we're leaving are run first,
+        // and then all systems from the enter schedule of the state we're entering are run second.
+        .add_systems(OnEnter(AppState::Menu), setup_menu)
+        // By contrast, update systems are stored in the `Update` schedule. They simply
+        // check the value of the `State<T>` resource to see if they should run each frame.
+        .add_systems(Update, menu.run_if(in_state(AppState::Menu)))
+        .add_systems(OnExit(AppState::Menu), cleanup_menu)
+        .add_systems(OnEnter(AppState::InGame), setup_game)
+        .add_systems(Update, (movement, change_color).run_if(in_state(AppState::InGame)));
+
+    // #[cfg(feature = "bevy_dev_tools")]
+    // app.add_systems(Update, bevy::dev_tools::states::log_transitions::<AppState>);
+    // #[cfg(not(feature = "bevy_dev_tools"))]
+    // warn!("Enable feature bevy_dev_tools to log state transitions");
+
+    app.run();
+}
+
+#[derive(Debug, Clone, Copy, Default, Eq, PartialEq, Hash, States)]
+enum AppState {
+    #[default]
+    Menu,
+    InGame,
+}
+
+#[derive(Resource)]
+struct MenuData {
+    button_entity: Entity,
+}
+
+const NORMAL_BUTTON: Color = Color::srgb(0.15, 0.15, 0.15);
+const HOVERED_BUTTON: Color = Color::srgb(0.25, 0.25, 0.25);
+const PRESSED_BUTTON: Color = Color::srgb(0.35, 0.75, 0.35);
+
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2d);
+}
+
+fn setup_menu(mut commands: Commands) {
+    let button_entity = commands
+        .spawn((
+            Node {
+                // center button
+                width: percent(100),
+                height: percent(100),
+                justify_content: JustifyContent::Center,
+                align_items: AlignItems::Center,
+                ..default()
+            },
+            children![(
+                Button,
+                Node {
+                    width: px(150),
+                    height: px(65),
+                    // horizontally center child text
+                    justify_content: JustifyContent::Center,
+                    // vertically center child text
+                    align_items: AlignItems::Center,
+                    ..default()
+                },
+                BackgroundColor(NORMAL_BUTTON),
+                children![(
+                    Text::new("Play"),
+                    TextFont { font_size: 33.0, ..default() },
+                    TextColor(Color::srgb(0.9, 0.9, 0.9)),
+                )],
+            )],
+        ))
+        .id();
+    commands.insert_resource(MenuData { button_entity });
+}
+
+fn menu(mut next_state: ResMut<NextState<AppState>>, mut interaction_query: Query<(&Interaction, &mut BackgroundColor), (Changed<Interaction>, With<Button>)>) {
+    for (interaction, mut color) in &mut interaction_query {
+        match *interaction {
+            Interaction::Pressed => {
+                *color = PRESSED_BUTTON.into();
+                next_state.set(AppState::InGame);
+            }
+            Interaction::Hovered => {
+                *color = HOVERED_BUTTON.into();
+            }
+            Interaction::None => {
+                *color = NORMAL_BUTTON.into();
+            }
+        }
+    }
+}
+
+fn cleanup_menu(mut commands: Commands, menu_data: Res<MenuData>) {
+    commands.entity(menu_data.button_entity).despawn();
+}
+
+fn setup_game(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn(Sprite::from_image(asset_server.load("branding/icon.png")));
+}
+
+const SPEED: f32 = 100.0;
+fn movement(time: Res<Time>, input: Res<ButtonInput<KeyCode>>, mut query: Query<&mut Transform, With<Sprite>>) {
+    for mut transform in &mut query {
+        let mut direction = Vec3::ZERO;
+        if input.pressed(KeyCode::ArrowLeft) {
+            direction.x -= 1.0;
+        }
+        if input.pressed(KeyCode::ArrowRight) {
+            direction.x += 1.0;
+        }
+        if input.pressed(KeyCode::ArrowUp) {
+            direction.y += 1.0;
+        }
+        if input.pressed(KeyCode::ArrowDown) {
+            direction.y -= 1.0;
+        }
+
+        if direction != Vec3::ZERO {
+            transform.translation += direction.normalize() * SPEED * time.delta_secs();
+        }
+    }
+}
+
+fn change_color(time: Res<Time>, mut query: Query<&mut Sprite>) {
+    for mut sprite in &mut query {
+        let new_color = LinearRgba {
+            blue: ops::sin(time.elapsed_secs() * 0.5) + 2.0,
+            ..LinearRgba::from(sprite.color)
+        };
+
+        sprite.color = new_color.into();
+    }
+}