类似于windows的画图板，基于MFC框架，能够实现文件的保存和读取，画点线圆矩形等，可设置线宽，线形和颜色-Similar to the windows of the drawing board, based on the MFC fr a mework, can be achieved to save the file and read, draw points and lines circle rectangle and so on, you can set line width, li