Method BuildCells

Common/DataModel/vtkPolyData.cxx:792–852

} // end anon namespace

VTK_ABI_NAMESPACE_BEGIN
//------------------------------------------------------------------------------
// Create data structure that allows random access of cells.
void vtkPolyData::BuildCells()
{
  vtkCellArray* verts = this->GetVerts();
  vtkCellArray* lines = this->GetLines();
  vtkCellArray* polys = this->GetPolys();
  vtkCellArray* strips = this->GetStrips();

  // here are the number of cells we have
  const vtkIdType nVerts = verts->GetNumberOfCells();
  const vtkIdType nLines = lines->GetNumberOfCells();
  const vtkIdType nPolys = polys->GetNumberOfCells();
  const vtkIdType nStrips = strips->GetNumberOfCells();

  // pre-allocate the space we need
  const vtkIdType nCells = nVerts + nLines + nPolys + nStrips;

  this->Cells = vtkSmartPointer<CellMap>::New();
  this->Cells->SetNumberOfCells(nCells);

  vtkIdType beginCellId = 0;
  if (nVerts > 0)
  {
    verts->Dispatch(BuildCellsImpl{}, this->Cells, beginCellId,
      [](vtkIdType size) -> VTKCellType { return size == 1 ? VTK_VERTEX : VTK_POLY_VERTEX; });
    beginCellId += nVerts;
  }

  if (nLines > 0)
  {
    lines->Dispatch(BuildCellsImpl{}, this->Cells, beginCellId,
      [](vtkIdType size) -> VTKCellType { return size == 2 ? VTK_LINE : VTK_POLY_LINE; });
    beginCellId += nLines;
  }

  if (nPolys > 0)
  {
    polys->Dispatch(BuildCellsImpl{}, this->Cells, beginCellId,
      [](vtkIdType size) -> VTKCellType
      {
        switch (size)
        {
          case 3:
            return VTK_TRIANGLE;
          case 4:
            return VTK_QUAD;
          default:
            return VTK_POLYGON;
        }
      });
    beginCellId += nPolys;
  }

  if (nStrips > 0)
  {
    strips->Dispatch(BuildCellsImpl{}, this->Cells, beginCellId,