public StoneStair(Point p, boolean up) {
        super(p);
        this.up = up;
        if (up) {
            flagCommand(Command.UP);
            addFlag(EntityFlag.POINT_MOVE_UP);
            controller = new StairController(this, up, EnviroSprite.stone_stair_up);
        } else {
            flagCommand(Command.DOWN);
            addFlag(EntityFlag.POINT_MOVE_DOWN);
            controller = new StairController(this, up, EnviroSprite.stone_stair_down);
        }


    }