在VS2008中MFC应用程序中 主要实现直线，矩形，椭圆，自由线的绘制（不能重绘） 以及图形颜色的填充 以及Bresenham画圆-MFC in VS2008 application in the main straight, rectangular, oval, the Liberal line drawing (not redraw), as well as color graphics and filled Bresenham drawcircle