中点画线发，在mfc中运行，能够有效的实现，谢谢大家-The dotted line, running in the MFC, can effectively realize, thank you

实现了 DAA画线法画直线 中点画线法画圆(输入x坐标,y坐标-Implements the DAA line drawing method to draw a straight line in the circle is drawn on the dotted line method (input coordinates x, y coordinates

内含直线生成的dda,中点画线算法及Bresenham算法界面美观方便实用()