本例展示了用C#进行图形图像编程的特性。它不仅具有GDI编程的一些基本功能，而且对GDI进行 了不少扩充，功能更强大。-This example demonstrates the features of using C# to program on graphics. It not only has the basic functions of GDI programs, but also extends the function of GDI, and therefore provides m