C#作业程序。有多种功能，最突出的是实现图画的分层显示。可以在所画的多边形上改变多边形的顶点。根据顶点程序自动可以进行分层。-C# Operating procedures. Has multiple functions, the most prominent is to achieve a hierarchical picture show. The painting can change the polygon vertices of the polygon. Under the verte