ez-roguelike/ch6/src/main.rs

#[macro_use]
extern crate specs_derive;
#[macro_use]
extern crate specs_system_macro;

mod components;
mod map;
mod systems;

use ggez::GameError;
use specs::prelude::{Builder, RunNow};

use components as com;

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::<carpet::Coord>();
    game.register::<com::Renderable>();
    game.register::<com::Motion>();
    game.register::<com::Player>();

    let map = map::Map::new();
    let player_start = map
        .rooms
        .first()
        .map(|r| r.center())
        .unwrap_or_else(|| [40, 25].into());
    let mut vs = carpet::Viewshed::create(&map.tiles, map::Cell::blocks_view);
    vs.range = Some(20);
    game.insert(map::Viewshed { vs, dirty: true });

    for r in map.rooms.iter().skip(1) {
        game.create_entity()
            .with(r.center())
            .with(com::Renderable {
                glyph: carpet::CP437::from_char('g'),
                color: carpet::Color::Red,
            })
            .build();
    }

    game.insert(map);

    game.create_entity()
        .with(player_start)
        .with(com::Player)
        .with(com::Renderable {
            glyph: carpet::CP437::from_char('@'),
            color: carpet::Color::Blue,
        })
        .build();

    {
        // set up all the keybindings
        use carpet::KeyCode::*;
        let none = carpet::KeyMods::NONE;
        game.on_key((W, none), |world| com::Motion::move_player(world, -1, 0));
        game.on_key((A, none), |world| com::Motion::move_player(world, 0, -1));
        game.on_key((S, none), |world| com::Motion::move_player(world, 1, 0));
        game.on_key((D, none), |world| com::Motion::move_player(world, 0, 1));
    }

    game.run_with_systems(|world| {
        systems::Visibility.run_now(world);
        systems::Draw.run_now(world);
        systems::Move.run_now(world);
    })
}