elsif [@game.snake.head.orientation, key] == [:north, swt(:arrow_left)] ||
          [@game.snake.head.orientation, key] == [:west, swt(:arrow_down)] ||
          [@game.snake.head.orientation, key] == [:south, swt(:arrow_right)] ||
          [@game.snake.head.orientation, key] == [:east, swt(:arrow_up)]
      @game.snake.turn_left