Method SetWindCountForOpenPathEdge

CPP/Clipper2Lib/src/clipper.engine.cpp:1089–1117

  void ClipperBase::SetWindCountForOpenPathEdge(Active& e)
  {
    Active* e2 = actives_;
    if (fillrule_ == FillRule::EvenOdd)
    {
      int cnt1 = 0, cnt2 = 0;
      while (e2 != &e)
      {
        if (GetPolyType(*e2) == PathType::Clip)
          cnt2++;
        else if (!IsOpen(*e2))
          cnt1++;
        e2 = e2->next_in_ael;
      }
      e.wind_cnt = (IsOdd(cnt1) ? 1 : 0);
      e.wind_cnt2 = (IsOdd(cnt2) ? 1 : 0);
    }
    else
    {
      while (e2 != &e)
      {
        if (GetPolyType(*e2) == PathType::Clip)
          e.wind_cnt2 += e2->wind_dx;
        else if (!IsOpen(*e2))
          e.wind_cnt += e2->wind_dx;
        e2 = e2->next_in_ael;
      }
    }
  }

  bool IsValidAelOrder(const Active& resident, const Active& newcomer)
  {