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feb2fc0ce6
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.gitignore
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.gitignore
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/target
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3266
Cargo.lock
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3266
Cargo.lock
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11
Cargo.toml
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Cargo.toml
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[package]
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name = "bevy-snake"
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version = "0.1.0"
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authors = ["Timothy Warren <twarren@nabancard.com>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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bevy = "0.2.1"
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rand = "0.7.3"
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166
src/main.rs
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src/main.rs
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use bevy::prelude::*;
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use bevy::render::pass::ClearColor;
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use std::time::Duration;
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const ARENA_WIDTH: u32 = 40;
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const ARENA_HEIGHT: u32 = 40;
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#[derive(Default, Copy, Clone, Debug, 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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#[derive(PartialEq, Copy, Clone, Debug)]
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enum Direction {
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Left,
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Up,
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Right,
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Down,
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}
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impl Direction {
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fn opposite(self: &Self) -> Self {
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match self {
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Self::Left => Self::Right,
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Self::Right => Self::Left,
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Self::Up => Self::Down,
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Self::Down => Self::Up,
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}
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}
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}
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#[derive(Default)]
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struct SnakeSegment {
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next_segment: Option<Entity>
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}
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struct SnakeHead {
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direction: Direction,
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next_segment: Entity,
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}
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struct SnakeMoveTimer(Timer);
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struct HeadMaterial(Handle<ColorMaterial>);
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fn snake_movement(
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time: Res<Time>,
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keyboard_input: Res<Input<KeyCode>>,
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mut snake_timer: ResMut<SnakeMoveTimer>,
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mut head_positions: Query<(&mut SnakeHead, &mut Position)>,
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) {
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snake_timer.0.tick(time.delta_seconds);
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for (mut head, mut head_pos) in &mut head_positions.iter() {
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let mut dir: Direction = head.direction;
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if keyboard_input.pressed(KeyCode::Left) {
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dir = Direction::Left;
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}
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if keyboard_input.pressed(KeyCode::Right) {
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dir = Direction::Right;
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}
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if keyboard_input.pressed(KeyCode::Down) {
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dir = Direction::Down;
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}
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if keyboard_input.pressed(KeyCode::Up) {
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dir = Direction::Up;
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}
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if dir != head.direction.opposite() {
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head.direction = dir;
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}
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if snake_timer.0.finished {
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match &head.direction {
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Direction::Left => {
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head_pos.x -= 1;
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}
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Direction::Right => {
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head_pos.x += 1;
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}
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Direction::Up => {
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head_pos.y -= 1;
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}
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Direction::Down => {
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head_pos.y += 1;
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}
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};
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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(p: f32, bound_window: f32, bound_game: f32) -> f32 {
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p / bound_game * bound_window - (bound_window / 2.)
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}
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let window = windows.get_primary().unwrap();
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for (pos, mut transform) in &mut q.iter() {
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transform.set_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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fn size_scaling(windows: Res<Windows>, mut q: Query<(&Size, &mut Sprite)>) {
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for (size, mut sprite) in &mut q.iter() {
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let window = windows.get_primary().unwrap();
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sprite.size = Vec2::new(
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size.width as f32 / ARENA_WIDTH as f32 * window.width as f32,
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size.height as f32 / 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 setup(mut commands: Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
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commands.spawn(Camera2dComponents::default());
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commands.insert_resource(HeadMaterial(
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materials.add(Color::rgb(0.7, 0.7, 0.7).into()),
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));
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}
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fn game_setup(mut commands: Commands, head_material: Res<HeadMaterial>) {
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commands
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.spawn(SpriteComponents {
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material: head_material.0,
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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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.with(SnakeHead { direction: Direction::Up })
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.with(Position { x: 10, y: 10 })
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.with(Size::square(0.8));
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}
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fn main() {
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App::build()
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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: 2000,
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height: 2000,
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..Default::default()
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})
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.add_resource(SnakeMoveTimer(Timer::new(
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Duration::from_millis((150.) as u64),
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true,
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)))
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.add_startup_system(setup.system())
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.add_startup_stage("game_setup")
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.add_startup_system_to_stage("game_setup", game_setup.system())
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.add_system(snake_movement.system())
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.add_system(position_translation.system())
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.add_system(size_scaling.system())
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.add_default_plugins()
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.run();
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}
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