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Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "snake"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bevy = "0.5.0"
+rand = "0.7.3"

src/main.rs

@@ -0,0 +1,282 @@
+use std::default::Default;
+
+use bevy::core::FixedTimestep;
+use bevy::prelude::*;
+use bevy::render::pass::ClearColor;
+use rand::prelude::random;
+
+
+const ARENA_WIDTH: u32 = 10;
+const ARENA_HEIGHT: u32 = 10;
+
+struct SnakeHead {
+    direction: Direction,
+}
+
+struct Food;
+
+struct GrowthEvent;
+
+#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
+struct Position {
+    x: i32,
+    y: i32,
+}
+
+struct Size {
+    width: f32,
+    height: f32,
+}
+
+impl Size {
+    pub fn square(x: f32) -> Size {
+        Self {
+            width: x,
+            height: x,
+        }
+    }
+}
+
+struct Materials {
+    head_material: Handle<ColorMaterial>,
+    segment_material: Handle<ColorMaterial>,
+    food_material: Handle<ColorMaterial>,
+}
+
+#[derive(PartialEq, Copy, Clone)]
+enum Direction {
+    Left,
+    Up,
+    Right,
+    Down,
+}
+
+impl Direction {
+    fn opposite(self) -> Self {
+        match self {
+            Self::Left => Self::Right,
+            Self::Right => Self::Left,
+            Self::Up => Self::Down,
+            Self::Down => Self::Up,
+        }
+    }
+}
+
+#[derive(SystemLabel, Debug, Hash, PartialEq, Eq, Clone)]
+pub enum SnakeMovement {
+    Input,
+    Movement,
+    Eating,
+    Growth,
+}
+
+struct SnakeSegment;
+
+#[derive(Default)]
+struct SnakeSegments {
+    segments: Vec<Entity>,
+}
+
+fn main() {
+    App::build()
+        .insert_resource(WindowDescriptor {
+            title: "Snake!".to_string(),
+            width: 500.0,
+            height: 500.0,
+            ..Default::default()
+        })
+        .insert_resource(ClearColor(Color::rgb(0.04, 0.04, 0.04)))
+        .insert_resource(SnakeSegments::default())
+        .add_startup_system(setup.system())
+        .add_startup_stage("game_setup", SystemStage::single(spawn_snake.system()))
+        .add_plugins(DefaultPlugins)
+        .add_system(
+            snake_movement_input
+                .system()
+                .label(SnakeMovement::Input)
+                .before(SnakeMovement::Movement),
+        )
+        .add_system_set(
+            SystemSet::new()
+                .with_run_criteria(FixedTimestep::step(0.3))
+                .with_system(snake_movement.system().label(SnakeMovement::Movement))
+                .with_system(
+                    snake_eating
+                        .system()
+                        .label(SnakeMovement::Eating)
+                        .after(SnakeMovement::Movement),
+                ),
+        )
+        .add_system_set_to_stage(
+            CoreStage::PostUpdate,
+            SystemSet::new()
+                .with_system(position_translation.system())
+                .with_system(size_scaling.system())
+        )
+        .add_system_set(
+            SystemSet::new()
+                .with_run_criteria(FixedTimestep::step(0.9))
+                .with_system(food_spawner.system()),
+        )
+        .add_event::<GrowthEvent>()
+        .run();
+}
+
+fn setup(mut commands: Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
+    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
+    commands.insert_resource(Materials {
+        head_material: materials.add(Color::rgb(0.7, 0.7, 0.7).into()),
+        segment_material: materials.add(Color::rgb(0.3, 0.3, 0.3).into()),
+        food_material: materials.add(Color::rgb(1.0, 0.0, 1.0).into()),
+    });
+}
+
+fn food_spawner(
+    mut commands: Commands,
+    materials: Res<Materials>,
+) {
+    commands
+        .spawn_bundle(SpriteBundle {
+            material: materials.food_material.clone(),
+            ..Default::default()
+        })
+        .insert(Food)
+        .insert(Position {
+            x: (random::<f32>() * ARENA_WIDTH as f32) as i32,
+            y: (random::<f32>() * ARENA_HEIGHT as f32) as i32,
+        })
+        .insert(Size::square(0.8));
+}
+
+fn spawn_segment(
+    mut commands: Commands,
+    material: &Handle<ColorMaterial>,
+    position: Position,
+) -> Entity {
+    commands
+        .spawn_bundle(SpriteBundle {
+            material: material.clone(),
+            ..Default::default()
+        })
+        .insert(SnakeSegment)
+        .insert(position)
+        .insert(Size::square(0.65))
+        .id()
+}
+
+fn spawn_snake(
+    mut commands: Commands,
+    materials: Res<Materials>,
+    mut segments: ResMut<SnakeSegments>,
+) {
+    segments.segments = vec![
+        commands
+            .spawn_bundle(SpriteBundle {
+                material: materials.head_material.clone(),
+                sprite: Sprite::new(Vec2::new(10.0, 10.0)),
+                ..Default::default()
+            })
+            .insert(SnakeHead {
+                direction: Direction::Up,
+            })
+            .insert(Position { x: 3, y: 3})
+            .insert(Size::square(0.8))
+            .id(),
+        spawn_segment(
+            commands,
+            &materials.segment_material,
+            Position { x: 3, y: 2},
+        ),
+    ]
+}
+
+fn snake_movement_input(
+    keyboard_input: Res<Input<KeyCode>>,
+    mut heads: Query<&mut SnakeHead>,
+) {
+    if let Some(mut head) = heads.iter_mut().next() {
+        let dir = if keyboard_input.pressed(KeyCode::Left) {
+            Direction::Left
+        } else if keyboard_input.pressed(KeyCode::Down) {
+            Direction::Down
+        } else if keyboard_input.pressed(KeyCode::Up) {
+            Direction::Up
+        } else if keyboard_input.pressed(KeyCode::Right) {
+            Direction::Right
+        } else {
+            head.direction
+        };
+        if dir != head.direction.opposite() {
+            head.direction = dir;
+        }
+    }
+}
+
+fn snake_movement(
+    segments: ResMut<SnakeSegments>,
+    mut heads: Query<(Entity, &SnakeHead)>,
+    mut positions: Query<&mut Position>,
+) {
+    if let Some((head_entity, head)) = heads.iter_mut().next() {
+        let segment_positions = segments
+            .segments
+            .iter()
+            .map(|e| *positions.get_mut(*e).unwrap())
+            .collect::<Vec<Position>>();
+        let mut head_pos = positions.get_mut(head_entity).unwrap();
+        match &head.direction {
+            Direction::Left => head_pos.x -= 1,
+            Direction::Right => head_pos.x += 1,
+            Direction::Up => head_pos.y += 1,
+            Direction::Down => head_pos.y -= 1,
+        }
+        segment_positions
+            .iter()
+            .zip(segments.segments.iter().skip(1))
+            .for_each(|(pos, segment)| {
+                *positions.get_mut(*segment).unwrap() = *pos;
+            });
+    }
+}
+
+fn snake_eating(
+    mut commands: Commands,
+    mut growth_writer: EventWriter<GrowthEvent>,
+    food_positions: Query<(Entity, &Position), With<Food>>,
+    head_positions: Query<&Position, With<SnakeHead>>,
+) {
+    for head_pos in head_positions.iter() {
+        for (ent, food_pos) in food_positions.iter() {
+            if food_pos == head_pos {
+                commands.entity(ent).despawn();
+                growth_writer.send(GrowthEvent);
+            }
+        }
+    }
+}
+
+fn size_scaling(windows: Res<Windows>, mut q: Query<(&Size, &mut Sprite)>) {
+    let window = windows.get_primary().unwrap();
+    for (size, mut sprite) in q.iter_mut() {
+        sprite.size = Vec2::new(
+            size.width / ARENA_WIDTH as f32 * window.width() as f32,
+            size.height / ARENA_HEIGHT as f32 * window.height() as f32,
+        );
+    }
+}
+
+fn position_translation(windows: Res<Windows>, mut q: Query<(&Position, &mut Transform)>) {
+    fn convert(pos: f32, bound_window: f32, bound_game: f32) -> f32 {
+        let tile_size = bound_window / bound_game;
+        pos / bound_game * bound_window - (bound_window / 2.0) + (tile_size / 2.0)
+    }
+
+    let window = windows.get_primary().unwrap();
+    for (pos, mut tf) in q.iter_mut() {
+        tf.translation = Vec3::new(
+            convert(pos.x as f32, window.width() as f32, ARENA_WIDTH as f32),
+            convert(pos.y as f32, window.height() as f32, ARENA_HEIGHT as f32),
+            0.0,
+        )
+    }
+}