一个有OPENGL实验的一个裁剪算法，用的是 sutherland-cohen的算法-an experimental OpenGL is a cutting algorithm, using the Sutherland-cohen algorithm

1、 矩形窗口的直线段裁剪（Cohen-Sutherlan算法必做，再在梁友栋和中点分割算法中任选一种）-a rectangular window line of cutting (Cohen-Sutherlan algorithm will do, again in mid-point and friends of Liang Dong segmentation algorithm An optional)

程序运行Cohen-Sutherland线段裁剪算法 ，所用坐标系为笛卡尔直角坐标系. 起始状：用户输入所画线段的起点和终点坐标 结束状态：程序打印出裁剪以后的线段-Program runs Cohen-Sutherland Line Clipping algorithm, used for the Cartesian coordinates Cartesian coordinate system. Start-shaped: the user to enter the draw