private void initKeyMapping() {
    	keyMapping.put(KeyEvent.VK_UP, SchlangenKopf.DIRECTION_UP);
    	keyMapping.put(KeyEvent.VK_DOWN, SchlangenKopf.DIRECTION_DOWN);
    	keyMapping.put(KeyEvent.VK_RIGHT, SchlangenKopf.DIRECTION_RIGHT);
    	keyMapping.put(KeyEvent.VK_LEFT, SchlangenKopf.DIRECTION_LEFT);
    }