Method ComputeBeginAndEnd

Common/DataModel/vtkExtractStructuredGridHelper.cxx:262–309

}

VTK_ABI_NAMESPACE_BEGIN
//------------------------------------------------------------------------------
void vtkExtractStructuredGridHelper::ComputeBeginAndEnd(
  int inExt[6], int voi[6], int begin[3], int end[3])
{
  vtkBoundingBox inExtB(inExt[0], inExt[1], inExt[2], inExt[3], inExt[4], inExt[5]);
  vtkBoundingBox uExtB(voi[0], voi[1], voi[2], voi[3], voi[4], voi[5]);
  std::fill(begin, begin + 3, 0);
  std::fill(end, end + 3, -1);

  int uExt[6];
  if (uExtB.IntersectBox(inExtB))
  {

    for (int i = 0; i < 6; ++i)
    {
      uExt[i] = roundToInt(uExtB.GetBound(i));
    }

    // Find the first and last indices in the map that are
    // within data extents. These are the extents of the
    // output data.
    for (int dim = 0; dim < 3; ++dim)
    {
      for (int idx = 0; idx < this->GetSize(dim); ++idx)
      {
        int extVal = this->GetMappedExtentValueFromIndex(dim, idx);
        if (extVal >= uExt[2 * dim] && extVal <= uExt[2 * dim + 1])
        {
          begin[dim] = idx;
          break;
        }
      } // END for all indices with

      for (int idx = this->GetSize(dim) - 1; idx >= 0; --idx)
      {
        int extVal = this->GetMappedExtentValueFromIndex(dim, idx);
        if (extVal <= uExt[2 * dim + 1] && extVal >= uExt[2 * dim])
        {
          end[dim] = idx;
          break;
        }
      } // END for all indices

    } // END for all dimensions

  } // END if box intersects
}

//------------------------------------------------------------------------------
void vtkExtractStructuredGridHelper::CopyPointsAndPointData(int inExt[6], int outExt[6],