Function OrderEdges

IO/Geometry/vtkTecplotReader.cxx:1208–1254

}

void OrderEdges(const std::vector<vtkIdType>& faceEdges,
  const std::vector<std::pair<vtkIdType, vtkIdType>>& allEdges, vtkIdList* face)
{
  face->Reset();
  if (faceEdges.empty())
    return;

  const auto& firstEdge = allEdges[faceEdges[0]];
  const vtkIdType from = firstEdge.first;
  face->InsertNextId(from);
  vtkIdType to = firstEdge.second;
  face->InsertNextId(to);

  size_t i = 0;
  while (to != from)
  {
    for (size_t j = 0; j < faceEdges.size(); ++j)
    {
      if (i == j)
        continue;

      const auto& edge = allEdges[faceEdges[j]];
      if (edge.first == to)
      {
        to = edge.second;
        i = j;
        face->InsertNextId(to);
        break;
      }
      else if (edge.second == to)
      {
        to = edge.first;
        i = j;
        face->InsertNextId(to);
        break;
      }
    }

    if (face->GetNumberOfIds() > static_cast<vtkIdType>(faceEdges.size() + 1))
    {
      // should not happen, but better exit than ending up in a continuous loop
      break;
    }
  }

  face->Resize(face->GetNumberOfIds() - 1);
}

void vtkTecplotReader::GetPolygonalGridCells(
  int numFaces, int numEdges, vtkUnstructuredGrid* unstruct) const