Method RequestData

Views/Core/vtkConvertSelectionDomain.cxx:195–305

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//------------------------------------------------------------------------------
int vtkConvertSelectionDomain::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // Retrieve the input and output.
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkDataObject* input = inInfo->Get(vtkDataObject::DATA_OBJECT());
  vtkAnnotationLayers* inputAnn = vtkAnnotationLayers::SafeDownCast(input);

  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkDataObject* output = outInfo->Get(vtkDataObject::DATA_OBJECT());
  vtkAnnotationLayers* outputAnn = vtkAnnotationLayers::SafeDownCast(output);

  outInfo = outputVector->GetInformationObject(1);
  vtkSelection* outputCurrentSel =
    vtkSelection::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  // If we have no mapping table, we are done.
  vtkInformation* mapInfo = inputVector[1]->GetInformationObject(0);
  vtkInformation* dataInfo = inputVector[2]->GetInformationObject(0);
  if (!dataInfo || !mapInfo)
  {
    output->ShallowCopy(input);
    return 1;
  }

  // If the input is instead a vtkSelection, wrap it in a vtkAnnotationLayers
  // object so it can be used uniformly in the function.
  bool createdInput = false;
  if (!inputAnn)
  {
    vtkSelection* inputSel = vtkSelection::SafeDownCast(input);
    inputAnn = vtkAnnotationLayers::New();
    inputAnn->SetCurrentSelection(inputSel);
    vtkSelection* outputSel = vtkSelection::SafeDownCast(output);
    outputAnn = vtkAnnotationLayers::New();
    outputAnn->SetCurrentSelection(outputSel);
    createdInput = true;
  }

  vtkMultiBlockDataSet* maps =
    vtkMultiBlockDataSet::SafeDownCast(mapInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataObject* data = dataInfo->Get(vtkDataObject::DATA_OBJECT());

  vtkDataSetAttributes* dsa1 = nullptr;
  int fieldType1 = 0;
  vtkDataSetAttributes* dsa2 = nullptr;
  int fieldType2 = 0;
  if (vtkDataSet::SafeDownCast(data))
  {
    dsa1 = vtkDataSet::SafeDownCast(data)->GetPointData();
    fieldType1 = vtkSelectionNode::POINT;
    dsa2 = vtkDataSet::SafeDownCast(data)->GetCellData();
    fieldType2 = vtkSelectionNode::CELL;
  }
  else if (vtkGraph::SafeDownCast(data))
  {
    dsa1 = vtkGraph::SafeDownCast(data)->GetVertexData();
    fieldType1 = vtkSelectionNode::VERTEX;