OpenGL c++ 鼠标划线 鼠标划矩形 1是划线 2是画矩形 矩形是裁剪窗口 可以裁剪线段
采用了梁友栋算法-OpenGL c++ mouse crossed a mouse is crossed draw a rectangle Draw a rectangle 2 is a rectangular window can be cut is a cut line segment algorithm using Liang Dong
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