logic to keep snake within boundaries

game_core/src/snake/snake.rs

@@ -95,6 +95,20 @@ impl Snake {
         field.get_tile(pos.x as usize, pos.y as usize) == Tile::Food
     }
 
+    pub fn keep_within_boundaries(&mut self, width: isize, height: isize) {
+        if self.body.position.x >= width {
+            self.body.position.x = 0;
+        } else if self.body.position.x < 0 {
+            self.body.position.x = width - 1;
+        }
+
+        if self.body.position.y >= height {
+            self.body.position.y = 0;
+        } else if self.body.position.y < 0 {
+            self.body.position.y = height - 1;
+        }
+    }
+
     pub fn do_move(&mut self) {
         println!("moving?");
         // probably a more optimal way of approaching this is just

game_core/src/snake/states.rs

@@ -55,6 +55,8 @@ impl SnakeState for MovingState {
             self.dt_accumulator -= interval;
         }
 
+        snake.keep_within_boundaries(field.width as isize, field.height as isize);
+
         None
     }
 }