本实验程序实现的主要函数及其说明关于绘制图形的算法的函数：voidDDALine(CPointstart,CPointend,longcolor);//用DDA算法绘制直线voidMiddleLine(CPointstart,CPointend,longcolor);//用中点算法绘制直线voidBresenhamLine(CPointstart,CPointend,longcolor);//用Bresenham算法绘制直线voidRectangle(CPointstart,CPointend,longcolor);//绘制多边形voidBresenhamCircle(CPointcenter,CPoint