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- #[macro_use]
- extern crate specs_derive;
- #[macro_use]
- extern crate specs_system_macro;
- use ggez::GameError;
- use rand::Rng;
- use specs::prelude::*;
- #[derive(PartialEq, Clone, Copy, Debug)]
- pub enum TileType {
- Wall,
- Floor,
- }
- impl TileType {
- fn glyph(self) -> carpet::CP437 {
- match self {
- TileType::Wall => carpet::CP437::from_char('#'),
- TileType::Floor => carpet::CP437::from_u8(0),
- }
- }
- }
- pub struct Map {
- tiles: carpet::Board<TileType>,
- }
- impl Map {
- fn new() -> Map {
- let mut rng = rand::thread_rng();
- let tiles = carpet::Board::new_from(80, 50, |x, y| {
- if x == 0 || x == 79 || y == 0 || y == 49 || rng.gen::<u8>() % 8 == 0 {
- TileType::Wall
- } else {
- TileType::Floor
- }
- });
- Map { tiles }
- }
- fn passable(&self, (x, y): (usize, usize)) -> bool {
- Some(&TileType::Floor) == self.tiles.get(x, y)
- }
- }
- #[derive(Component)]
- pub struct Pos {
- x: usize,
- y: usize,
- }
- #[derive(Component)]
- pub struct Renderable {
- glyph: carpet::CP437,
- color: carpet::Color,
- }
- #[derive(Component)]
- pub struct Player;
- impl Player {
- fn get_entity(world: &mut specs::World) -> Entity {
- let storage = (&world.read_component::<Player>(), &world.entities());
- storage
- .join()
- .next()
- .expect("No entities tagged as Player")
- .1
- }
- }
- #[derive(Component)]
- pub struct Motion {
- down: i8,
- right: i8,
- }
- impl Motion {
- fn move_player(world: &mut specs::World, down: i8, right: i8) {
- let player = Player::get_entity(world);
- world
- .write_component::<Motion>()
- .insert(player, Motion { down, right })
- .unwrap();
- }
- }
- system_impl! {
- Draw(
- resource mut game_board: carpet::GameBoard<carpet::CP437>,
- resource map: Map,
- renderable: Renderable,
- pos: Pos,
- ) {
- game_board.clear();
- for (x, y, t) in map.tiles.iter() {
- game_board.set([x, y], t.glyph());
- }
- for (p, r) in (&pos, &renderable).join() {
- game_board.set_with_color([p.x, p.y], r.glyph, r.color);
- }
- }
- }
- system! {
- Move (
- resource map: Map,
- mut motion: Motion,
- mut pos: Pos,
- ) {
- let tgt_x = (pos.x as i8 + motion.right) as usize;
- let tgt_y = (pos.y as i8 + motion.down) as usize;
- if map.passable((tgt_x, tgt_y)) {
- pos.x = tgt_x;
- pos.y = tgt_y;
- }
- } finally {
- motion.clear();
- }
- }
- fn main() -> Result<(), GameError> {
- let mut game: carpet::Game<carpet::CP437> = carpet::GameBuilder::new()
- .name("game")
- .author("me")
- .resource_path({
- let base = std::env::var("CARGO_MANIFEST_DIR").unwrap();
- let mut path = std::path::PathBuf::from(base);
- path.pop();
- path.push("resources");
- path
- })
- .tileset("/haberdash.gif", [12, 12])
- .map_size(80, 50)
- .build()?;
- game.register::<Pos>();
- game.register::<Renderable>();
- game.register::<Motion>();
- game.register::<Player>();
- game.insert(Map::new());
- game.create_entity()
- .with(Pos { x: 40, y: 25 })
- .with(Player)
- .with(Renderable {
- glyph: carpet::CP437::from_char('A'),
- color: carpet::Color::Blue,
- })
- .build();
- game.on_key((carpet::KeyCode::W, carpet::KeyMods::NONE), |world| {
- Motion::move_player(world, -1, 0);
- });
- game.on_key((carpet::KeyCode::A, carpet::KeyMods::NONE), |world| {
- Motion::move_player(world, 0, -1);
- });
- game.on_key((carpet::KeyCode::S, carpet::KeyMods::NONE), |world| {
- Motion::move_player(world, 1, 0);
- });
- game.on_key((carpet::KeyCode::D, carpet::KeyMods::NONE), |world| {
- Motion::move_player(world, 0, 1);
- });
- game.run_with_systems(|world| {
- Draw.run_now(world);
- Move.run_now(world);
- })
- }
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