This procedure, imitation AutoCAD, has achieved the two

代码说明：

本程序,仿制AutoCAD,已经实现了二维绘图的所有功能,包括点、线、圆、文字等图形绘制,编辑,复制,删除等所有操作,功能齐全。-This procedure, imitation AutoCAD, has achieved the two-dimensional drawings of all the features, including point, line, circle, text, graphics rendering, etc., edit, copy, delete all operations functions.