Check if move would end in a wall first

src/game.rs

@@ -1,14 +1,30 @@
-use crate::level::Level;
+use crate::level::{Level, LevelElement};
 use crate::player::Player;
 
 pub struct Game {
     pub player: Player,
-    pub levels: [Level; 25]
+    pub levels: [Level; 25],
 }
 
 impl Game {
     pub fn move_player(&mut self, dx: i8, dy: i8) {
         // check if move is allowed first
+        let player = &self.player;
+        let player_pos = player.get_position();
+        let level = &self.levels[player_pos.get_level() as usize];
+        let new_x = ((player_pos.get_x() as i16) + dx as i16) as u16;
+        let new_y = ((player_pos.get_y() as i16) + dy as i16) as u16;
+        let can_go: bool = match level.get_element(new_x as i16, new_y as i16) {
+            None => { false }
+            Some(t) => {
+                match t {
+                    LevelElement::Wall => { false }
+                    _ => { true }
+                }
+            }
+        };
+        if can_go {
             self.player.change_position(dx, dy);
         }
     }
+}