Introduction - If you have any usage issues, please Google them yourself
Rectangular window with a reduction of more deformation simulation, the Liang-Barsky line for reductions. Parameters such as the rectangular window (XL = 150, XR = 350, YB = 150, YT = 300), line segment endpoints (x1 = 50 y1 = 250 x2 = 400 y2 = 90)