MFC画图小程序。可以画直线、矩形、椭圆等；还可以输入字符并显示；实现了简单的保存功能，再次打开后可以见到保存前的图形；-MFC drawing applet. Can draw lines, rectangles, ellipses, etc. can also enter a character and display to achieve a simple save function, after re-opening to see the graphics before saving

画图、保存、打开,改变文档模式是图形不变-This program can draw lines with saving and opening mode

Morphological Opeartions like Opening, Closing, Dilation, Erosion, Boundry Extraction with 4 and 8 neighbourhoods-Morphological Opeartions like Opening, Closing, Dilation, Erosion, Boundry Extraction with 4 and 8 neighbourhoods..

本函数从当前位置绘制直线段，但不包括(ｘ,ｙ)点。不包括终点坐标是为了实现多线段连接时公共点的处理，即采用起点闭区间，终点开区间的处理方法。绘制直线段函数的参数不包含颜色，直线段的颜色通过画笔来指定。(This function draws a straight line segment from the current position, but does not include (x, y) points. The end point coordinate is not used to re