此程序可以完成对矩形框的绘制，对椭圆或者其他线型的绘制，并在关闭后保存绘图痕迹，可以利用序列化打开之前的存储-This procedure can be done to draw a rectangular box, this procedure can be done to draw the rectangle, oval or linear drawing, and is closed to save the drawing marks, you can use the storage be