VC功能很强大，但正是因为强大的功能，导致了很多地方都需要用户的干预才能完成，特别是画图方面，这个例程对这个过程进行了一定的封装，相信对你一定会帮助不小！-VC function is very powerful, but because of powerful features, resulting in a lot of places require user intervention to complete, especially in drawing, which is routine