cocos2dx-3.8.1 获取图形多边形边界

	auto pinfo = Autopolygon::generatepolygon("dog.png",Rect::ZERO,1);
	//第三个参数用于控制弯角幅度的大小
	auto ret = Sprite::create(pinfo);
	ret->setPosition(pos);
	addChild(ret);
	ret->debugDraw(true);