2020-11-04 10:09:02 -05:00
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use bevy::prelude::*;
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2020-12-24 14:07:46 -05:00
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use bevy::render::pass::ClearColor;
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2020-12-24 14:14:18 -05:00
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use rand::prelude::random;
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use std::time::Duration;
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2020-11-04 10:09:02 -05:00
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2020-12-24 14:01:05 -05:00
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const ARENA_WIDTH: u32 = 10;
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const ARENA_HEIGHT: u32 = 10;
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#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
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struct Position {
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x: i32,
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y: i32,
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}
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struct Size {
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width: f32,
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height: f32,
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}
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impl Size {
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pub fn square(x: f32) -> Self {
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Self {
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width: x,
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height: x,
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}
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}
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}
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2020-12-24 13:41:55 -05:00
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struct SnakeHead;
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struct Materials {
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head_material: Handle<ColorMaterial>,
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2020-12-24 14:14:18 -05:00
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food_material: Handle<ColorMaterial>,
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}
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struct Food;
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struct FoodSpawnTimer(Timer);
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impl Default for FoodSpawnTimer {
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fn default() -> Self {
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Self(Timer::new(Duration::from_millis(1000), true))
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}
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2020-12-24 13:41:55 -05:00
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}
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fn setup(commands: &mut Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
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2020-12-24 13:34:47 -05:00
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commands.spawn(Camera2dBundle::default());
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2020-12-24 13:41:55 -05:00
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commands.insert_resource(Materials {
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head_material: materials.add(Color::rgb(0.7, 0.7, 0.7).into()),
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2020-12-24 14:14:18 -05:00
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food_material: materials.add(Color::rgb(1.0, 0.0, 1.0).into()),
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2020-12-24 13:41:55 -05:00
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});
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}
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fn spawn_snake(commands: &mut Commands, materials: Res<Materials>) {
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commands
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.spawn(SpriteBundle {
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material: materials.head_material.clone(),
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sprite: Sprite::new(Vec2::new(10.0, 10.0)),
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..Default::default()
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})
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2020-12-24 14:01:05 -05:00
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.with(SnakeHead)
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.with(Position { x: 3, y: 3 })
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.with(Size::square(0.8));
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2020-11-04 10:09:02 -05:00
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}
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2020-12-24 13:49:23 -05:00
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fn snake_movement(
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keyboard_input: Res<Input<KeyCode>>,
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2020-12-24 14:04:06 -05:00
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mut head_positions: Query<&mut Position, With<SnakeHead>>,
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2020-12-24 13:49:23 -05:00
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) {
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2020-12-24 14:04:06 -05:00
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for mut pos in head_positions.iter_mut() {
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2020-12-24 13:49:23 -05:00
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if keyboard_input.pressed(KeyCode::Left) {
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2020-12-24 14:04:06 -05:00
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pos.x -= 1;
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2020-12-24 13:49:23 -05:00
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}
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if keyboard_input.pressed(KeyCode::Right) {
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2020-12-24 14:04:06 -05:00
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pos.x += 1;
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2020-12-24 13:49:23 -05:00
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}
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if keyboard_input.pressed(KeyCode::Down) {
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2020-12-24 14:04:06 -05:00
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pos.y -= 1;
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2020-12-24 13:49:23 -05:00
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}
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if keyboard_input.pressed(KeyCode::Up) {
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2020-12-24 14:04:06 -05:00
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pos.y += 1;
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2020-12-24 13:49:23 -05:00
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}
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2020-12-24 13:45:07 -05:00
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}
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}
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2020-12-24 14:01:05 -05:00
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fn size_scaling(windows: Res<Windows>, mut q: Query<(&Size, &mut Sprite)>) {
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let window = windows.get_primary().unwrap();
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for (sprite_size, mut sprite) in q.iter_mut() {
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sprite.size = Vec2::new(
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sprite_size.width / ARENA_WIDTH as f32 * window.width() as f32,
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sprite_size.height / ARENA_HEIGHT as f32 * window.height() as f32,
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);
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}
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}
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fn position_translation(windows: Res<Windows>, mut q: Query<(&Position, &mut Transform)>) {
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fn convert(pos: f32, bound_window: f32, bound_game: f32) -> f32 {
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let tile_size = bound_window / bound_game;
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pos / bound_game * bound_window - (bound_window / 2.) + (tile_size / 2.)
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}
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let window = windows.get_primary().unwrap();
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for (pos, mut transform) in q.iter_mut() {
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transform.translation = Vec3::new(
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convert(pos.x as f32, window.width() as f32, ARENA_WIDTH as f32),
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convert(pos.y as f32, window.height() as f32, ARENA_HEIGHT as f32),
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0.0,
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);
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}
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}
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2020-12-24 14:14:18 -05:00
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fn food_spawner(
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commands: &mut Commands,
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materials: Res<Materials>,
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time: Res<Time>,
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mut timer: Local<FoodSpawnTimer>,
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) {
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if timer.0.tick(time.delta_seconds().finished()) {
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commands
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.spawn(SpriteBundle {
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material: materials.food_material.clone(),
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..Default::default()
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})
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.with(Food)
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.with(Position {
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x: (random::<f32>() * ARENA_WIDTH as f32) as i32,
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y: (random::<f32>() * ARENA_HEIGHT as f32) as i32,
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})
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.with(Size::square(0.8));
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}
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}
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2020-11-04 10:09:02 -05:00
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fn main() {
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App::build()
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2020-12-24 14:07:46 -05:00
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.add_resource(ClearColor(Color::rgb(0.04, 0.04, 0.04)))
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.add_resource(WindowDescriptor {
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title: "Snake!".to_string(),
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width: 500.0,
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height: 500.0,
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..Default::default()
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})
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2020-11-04 10:09:02 -05:00
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.add_startup_system(setup.system())
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2020-12-24 13:41:55 -05:00
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.add_startup_stage("game_setup", SystemStage::single(spawn_snake.system()))
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2020-12-24 13:45:07 -05:00
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.add_system(snake_movement.system())
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2020-12-24 14:01:05 -05:00
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.add_system(position_translation.system())
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.add_system(size_scaling.system())
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2020-12-24 14:14:18 -05:00
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.add_system(food_spawner.system())
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2020-12-24 13:34:47 -05:00
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.add_plugins(DefaultPlugins)
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2020-11-04 10:09:02 -05:00
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.run();
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}
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