pad_bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pad);
/* arrow at the bottom of the launchpad image */
pad_off_x = pad_bitmap.getWidth() / 2;
pad_bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pad);
/* arrow at the bottom of the launchpad image */
pad_off_x = pad_bitmap.getWidth() / 2;