rust-roguelike-tutorial/chapter-05-fov/src/main.rs

extern crate rltk;
use rltk::{Console, GameState, Rltk, RGB};
extern crate specs;
use specs::prelude::*;
#[macro_use]
extern crate specs_derive;
mod components;
pub use components::*;
mod map;
pub use map::*;
mod player;
use player::*;
mod rect;
pub use rect::Rect;
mod visibility_system;
use visibility_system::VisibilitySystem;

pub struct State {
    pub ecs: World,
    pub systems: Dispatcher<'static, 'static>
}

impl GameState for State {
    fn tick(&mut self, ctx : &mut Rltk) {
        ctx.cls();

        player_input(self, ctx);
        self.systems.dispatch(&self.ecs);

        draw_map(&self.ecs, ctx);

        let positions = self.ecs.read_storage::<Position>();
        let renderables = self.ecs.read_storage::<Renderable>();

        for (pos, render) in (&positions, &renderables).join() {
            ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph);
        }
    }
}

fn main() {
    let context = Rltk::init_simple8x8(80, 50, "Hello Rust World", "../resources");
    let mut gs = State {
        ecs: World::new(),
        systems : DispatcherBuilder::new()
            .with(VisibilitySystem{}, "visibility_system", &[])
            .build()
    };
    gs.ecs.register::<Position>();
    gs.ecs.register::<Renderable>();
    gs.ecs.register::<Player>();
    gs.ecs.register::<Viewshed>();

    let map : Map = Map::new_map_rooms_and_corridors();
    let (player_x, player_y) = map.rooms[0].center();
    gs.ecs.insert(map);

    gs.ecs
        .create_entity()
        .with(Position { x: player_x, y: player_y })
        .with(Renderable {
            glyph: rltk::to_cp437('@'),
            fg: RGB::named(rltk::YELLOW),
            bg: RGB::named(rltk::BLACK),
        })
        .with(Player{})
        .with(Viewshed{ visible_tiles : Vec::new(), range: 8, dirty: true })
        .build();

    rltk::main_loop(context, gs);
}