handling visibility, also fixed corridor issue

src/main.rs

@@ -67,8 +67,7 @@ impl GameState for State {
         ctx.cls();
         self.run_systems();
         player_input(self, ctx);
-        let map = self.ecs.fetch::<Map>();
-        map.draw_map(ctx);
+        draw_map(&self.ecs, ctx);
         let positions = self.ecs.read_storage::<Position>();
         let renderables = self.ecs.read_storage::<Renderable>();
 
@@ -78,6 +77,45 @@ impl GameState for State {
     }
 }
 
+pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
+    let map = ecs.fetch::<Map>();
+
+    let mut y = 0;
+    let mut x = 0;
+    for (idx, tile) in map.tiles.iter().enumerate() {
+        // Render a tile depending upon the tile type, if revealed
+        if map.revealed_tiles[idx] {
+            match tile {
+                TileType::Floor => {
+                    ctx.set(
+                        x,
+                        y,
+                        RGB::from_f32(0.5, 0.5, 0.5),
+                        RGB::from_f32(0., 0., 0.),
+                        rltk::to_cp437('.'),
+                    );
+                }
+                TileType::Wall => {
+                    ctx.set(
+                        x,
+                        y,
+                        RGB::from_f32(0.0, 1.0, 0.0),
+                        RGB::from_f32(0., 0., 0.),
+                        rltk::to_cp437('#'),
+                    );
+                }
+            }
+        }
+
+        // Move the coordinates
+        x += 1;
+        if x >= map.width {
+            x = 0;
+            y += 1;
+        }
+    }
+}
+
 fn main() {
     use rltk::RltkBuilder;
     let context = RltkBuilder::simple80x50()