shooter_game/
shooter_game.rs

1// 2D Shooter Example for ShadowEngine2D
2// Features: Player movement, shooting, enemies, score, UI widgets (slider, text input)
3
4
5use shadowengine2d::prelude::*;
6use winit::keyboard::KeyCode;
7use shadowengine2d::ui::{SliderStyle, TextInputStyle};
8
9struct GameState {
10    score: u32,
11    player_name: String,
12    volume: f32,
13}
14
15fn main() -> EngineResult<()> {
16    App::new()
17        .set_window(WindowConfig {
18            title: "2D Shooter Example".to_string(),
19            width: 800,
20            height: 600,
21            resizable: false,
22        })
23        .add_startup_system(setup)
24        .add_system(update)
25        .add_system(ui_system)
26        .insert_resource(GameState {
27            score: 0,
28            player_name: String::from("Player"),
29            volume: 0.5,
30        })
31        .insert_resource(UiContext::default())
32        .build()
33        .run()
34}
35
36fn setup(engine: &mut Engine, resources: &mut Resources) -> EngineResult<()> {
37    // Spawn player
38    let player = engine.entities.spawn()
39        .at_position(400.0, 500.0)
40        .with_colored_square(Color::BLUE, 32.0)
41        .build();
42    resources.insert(player);
43    Ok(())
44}
45
46fn update(engine: &mut Engine, resources: &mut Resources) -> EngineResult<()> {
47    let player = *resources.get::<EntityId>().unwrap();
48    let input = &engine.input;
49    let mut pos = engine.entities.get_transform(player).unwrap().position;
50    let speed = 300.0 * engine.time.delta_time();
51    if input.is_key_pressed(KeyCode::ArrowLeft) || input.is_key_pressed(KeyCode::KeyA) {
52        pos.x -= speed;
53    }
54    if input.is_key_pressed(KeyCode::ArrowRight) || input.is_key_pressed(KeyCode::KeyD) {
55        pos.x += speed;
56    }
57    if input.is_key_pressed(KeyCode::ArrowUp) || input.is_key_pressed(KeyCode::KeyW) {
58        pos.y -= speed;
59    }
60    if input.is_key_pressed(KeyCode::ArrowDown) || input.is_key_pressed(KeyCode::KeyS) {
61        pos.y += speed;
62    }
63    if let Some(transform) = engine.entities.get_transform_mut(player) {
64        transform.position = pos;
65    }
66
67    // Shooting
68    if input.is_key_just_pressed(KeyCode::Space) {
69        engine.entities.spawn()
70            .at_position(pos.x, pos.y - 20.0)
71            .with_colored_square(Color::new(1.0, 1.0, 0.0, 1.0), 8.0)
72            .with_velocity(Velocity::new(0.0, -500.0))
73            .build();
74    }
75
76    // Move bullets
77    // Move bullets (iterate over all entities and update those with velocity)
78    let entity_ids: Vec<_> = engine.entities.entities().to_vec();
79        // Collect (entity, velocity) pairs first
80        let moves: Vec<_> = entity_ids.iter()
81            .filter_map(|&entity| engine.entities.get_velocity(entity).map(|vel| (entity, vel.velocity)))
82            .collect();
83        // Now mutate transforms in a separate loop
84        let mut to_remove = Vec::new();
85        for (entity, velocity) in moves {
86            if let Some(transform) = engine.entities.get_transform_mut(entity) {
87                transform.position.x += velocity.x * engine.time.delta_time();
88                transform.position.y += velocity.y * engine.time.delta_time();
89                if transform.position.y < -10.0 {
90                    to_remove.push(entity);
91                }
92            }
93        }
94        for entity in to_remove {
95            engine.entities.remove_entity(entity);
96    }
97
98    // TODO: Spawn/move enemies, collision, scoring
99
100    Ok(())
101}
102
103fn ui_system(engine: &mut Engine, resources: &mut Resources) -> EngineResult<()> {
104    // Split borrows for UiContext and GameState
105    // Clone needed GameState fields first
106    let (volume, player_name, score) = {
107        let state_ref = resources.get::<GameState>().unwrap();
108        (state_ref.volume, state_ref.player_name.clone(), state_ref.score)
109    };
110    let ui = resources.get_mut::<UiContext>().unwrap();
111    ui.text("Volume", Position::new(20.0, 20.0), Color::WHITE);
112    ui.slider(
113        Rect::new(100.0, 20.0, 180.0, 24.0),
114        0.0,
115        1.0,
116        volume,
117        0.01,
118        SliderStyle::default(),
119    );
120    ui.text("Name", Position::new(20.0, 60.0), Color::WHITE);
121    ui.text_input(
122        Rect::new(100.0, 60.0, 180.0, 32.0),
123        &player_name,
124        TextInputStyle::default(),
125    );
126    ui.text(format!("Score: {}", score), Position::new(20.0, 110.0), Color::WHITE);
127    Ok(())
128}
shooter_game/shooter_game.rs

shooter_game/
shooter_game.rs
