Method ReadFaceArray

IO/XML/vtkXMLUnstructuredDataReader.cxx:1456–1663

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//------------------------------------------------------------------------------
int vtkXMLUnstructuredDataReader::ReadFaceArray(vtkIdType numberOfCells, vtkXMLDataElement* eCells,
  vtkIdTypeArray* outFaces, vtkIdTypeArray* outFaceOffsets)
{
  if (numberOfCells <= 0)
  {
    return 1;
  }
  else
  {
    if (!eCells || !outFaces || !outFaceOffsets)
    {
      return 0;
    }
  }

  // Split progress range into 1/5 for faces array and 4/5 for
  // faceoffsets array.  This assumes an average of 4 points per
  // face.  Unfortunately, we cannot know the length ahead of time
  // to calculate the real fraction.
  float progressRange[2] = { 0, 0 };
  this->GetProgressRange(progressRange);
  float fractions[3] = { 0, 0.2f, 1 };

  // Set range of progress for offsets array.
  this->SetProgressRange(progressRange, 0, fractions);

  // Read the cell offsets.
  vtkXMLDataElement* efaceOffsets = this->FindDataArrayWithName(eCells, "faceoffsets");
  if (!efaceOffsets)
  {
    vtkErrorMacro("Cannot read face offsets from "
      << eCells->GetName() << " in piece " << this->Piece
      << " because the \"faceoffsets\" array could not be found.");
    return 0;
  }
  vtkAbstractArray* ac1 = this->CreateArray(efaceOffsets);
  vtkDataArray* c1 = vtkArrayDownCast<vtkDataArray>(ac1);
  if (!c1 || (c1->GetNumberOfComponents() != 1))
  {
    vtkErrorMacro("Cannot read face offsets from "
      << eCells->GetName() << " in piece " << this->Piece
      << " because the \"faceoffsets\" array could not be created"
      << " with one component.");
    if (ac1)
    {
      ac1->Delete();
    }
    return 0;
  }
  c1->SetNumberOfTuples(numberOfCells);
  if (!this->ReadArrayValues(efaceOffsets, 0, c1, 0, numberOfCells))
  {
    vtkErrorMacro("Cannot read face offsets from "
      << eCells->GetName() << " in piece " << this->Piece
      << " because the \"faceoffsets\" array is not long enough.");
    return 0;
  }
  vtkIdTypeArray* faceOffsets = this->ConvertToIdTypeArray(c1);