可以使用点,线,矩形等进行画画 主要使用ON_WM_LBUTTONDOWN() ON_WM_MOUSEMOVE() ON_WM_LBUTTONUP() 三个函数进行操作-can use points, lines, Rectangular etc. paint mainly use ON_WM_LBUTTONDOWN () ON_WM_MOUS EMOVE () ON_WM_LBUTTONUP () function to operate 3

利用windows MFC创建工具栏，实现画圆和矩形-Use the toolbar to create windows MFC to achieve drawcircle and rectangular

使用工具条，实现简单画图，只能画斜线、矩形、圆，并设置颜色等-Use the toolbar, simple drawing, painting only slash, rectangular, round, and set the color, etc.

在MFC单文档工具栏中添加各种绘图，像矩形，圆形，直线，等简单的操作-MFC single document in the toolbar to add a variety of graphics, such as rectangular, circular, linear, simple operation