no longer walking through walls

src/main.rs

@@ -95,10 +95,15 @@ struct Player {}
 fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
     let mut positions = ecs.write_storage::<Position>();
     let mut players = ecs.write_storage::<Player>();
+    let map = ecs.fetch::<Vec<TileType>>();
 
     for (_player, pos) in (&mut players, &mut positions).join() {
-        pos.x = min(79 , max(0, pos.x + delta_x));
-        pos.y = min(49, max(0, pos.y + delta_y));
+        let x = min(79 , max(0, pos.x + delta_x));
+        let y = min(49, max(0, pos.y + delta_y));
+	if map[xy_idx(x,y)] != TileType::Wall {
+	    pos.x = x;
+	    pos.y = y;
+	}
     }
 }