C#绘图，可以画直线，圆，椭圆等，很不错的，使用了命令行设计模式，对c#画图和设计模式感兴趣的同学可以下来-C# Graphics, you can draw a straight line, round, oval and so on, very good, use the command-line design model, c# Drawing and design patterns can be of interest to the students down