分别用编码法和中点法对编码进行运算，进行裁剪的判断，找出窗口内线段的两个端点。-Coding method, respectively, and the mid-point method of computing code, the judge cut to identify the two segments within the window endpoint.

简易的opengl平面裁剪（主要用于作为学习参考范例）-Simple opengl plane clipping (mainly used as a learning reference example)

实现线段的裁剪 画个框作为裁剪窗口 保留框内线段-Draw a line cut to achieve a crop window box frame line reservations