开发可视化软件，和简单的二维画图， mfc程序设计效果-Development of visualization software, and a simple two dimensional drawing, mfc programming effects

用mfc制作简单的画图软件，实现绘制圆，三角形，矩形等基本图形，可以旋转，放大缩小等基本功能-Using MFC to write a drawing software, you can draw a circle, line, triangle and other basic graphics, you can achieve rotation, zoom and other basic functions