Method RequestData

Filters/Extraction/vtkExtractVectorComponents.cxx:182–334

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkExtractVectorComponents::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet* output = vtkDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkIdType numVectors = 0, numVectorsc = 0;
  vtkDataArray *vectors, *vectorsc;
  vtkDataArray *vx, *vy, *vz;
  vtkDataArray *vxc, *vyc, *vzc;
  vtkPointData *pd, *outVx, *outVy = nullptr, *outVz = nullptr;
  vtkCellData *cd, *outVxc, *outVyc = nullptr, *outVzc = nullptr;

  vtkDebugMacro(<< "Extracting vector components...");

  // taken out of previous update method.
  output->CopyStructure(input);
  if (!this->ExtractToFieldData)
  {
    this->GetVyComponent()->CopyStructure(input);
    this->GetVzComponent()->CopyStructure(input);
  }

  pd = input->GetPointData();
  cd = input->GetCellData();
  outVx = output->GetPointData();
  outVxc = output->GetCellData();
  if (!this->ExtractToFieldData)
  {
    outVy = this->GetVyComponent()->GetPointData();
    outVz = this->GetVzComponent()->GetPointData();
    outVyc = this->GetVyComponent()->GetCellData();
    outVzc = this->GetVzComponent()->GetCellData();
  }

  vectors = pd->GetVectors();
  vectorsc = cd->GetVectors();
  if ((vectors == nullptr || ((numVectors = vectors->GetNumberOfTuples()) < 1)) &&
    (vectorsc == nullptr || ((numVectorsc = vectorsc->GetNumberOfTuples()) < 1)))
  {
    vtkErrorMacro(<< "No vector data to extract!");
    return 1;
  }

  const char* name = nullptr;
  if (vectors && vectors->GetName())
  {
    name = vectors->GetName();
  }
  else if (vectorsc && vectorsc->GetName())
  {
    name = vectorsc->GetName();
  }