本程序可完成三种画线算法：DDA画线算法、中点画线算法、Breharm画线算法。还有清屏功能，还有两种裁剪算法，还有中点画圆算法的实现。-This program can complete three painting line algorithm: DDA painting line algorithm, stipple line algorithm, Breharm painting line algorithm. There are clear screen function, there