Describe: computational geometry algorithm commonly used, including whether a multilateral type in determining whether the intersection of two straight, the nearest point on Plane

File list(time 2005050421~2009020919)(Click to check if it's the file you need, and recomment it at the bottom):
  计算几何
  ........\判定两条直线是否相交
  ........\....................\判定两条直线是否相交.cpp
  ........\平面最近点对
  ........\............\2107.cpp
  ........\点是否在多边型中
  ........\................\1081.cpp

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