梁友栋算法，矩形裁剪直线 按1鼠标画直线，按2鼠标画矩形，并且矩形会裁剪直线-Liang Dong algorithm, a rectangular cut a straight line drawn by a mouse line, according to two mouse draw a rectangle, and the rectangle will be cut a straight line

计算机图形学裁剪算法，包括梁友栋算法和Cohen-Sutherland算法-Computer graphics clipping algorithms, including Liang Dong algorithms and Cohen-Sutherland Algorithm

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