Method RequestData

Filters/Extraction/vtkExtractDataArraysOverTime.cxx:740–785

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

//------------------------------------------------------------------------------
int vtkExtractDataArraysOverTime::RequestData(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  if (this->NumberOfTimeSteps <= 0)
  {
    vtkErrorMacro("No time steps in input data!");
    return 0;
  }

  if (this->FieldAssociation == vtkDataObject::FIELD ||
    this->FieldAssociation == vtkDataObject::POINT_THEN_CELL || this->FieldAssociation < 0 ||
    this->FieldAssociation >= vtkDataObject::NUMBER_OF_ATTRIBUTE_TYPES)
  {
    vtkErrorMacro("Unsupported FieldAssociation '" << this->FieldAssociation << "'.");
    return 0;
  }

  // is this the first request?
  if (this->Internal == nullptr)
  {
    this->Internal = new vtkInternal(this->NumberOfTimeSteps, this);
    this->Error = vtkExtractDataArraysOverTime::NoError;
    this->CurrentTimeIndex = 0;

    // Tell the pipeline to start looping.
    request->Set(vtkStreamingDemandDrivenPipeline::CONTINUE_EXECUTING(), 1);
  }

  assert(this->Internal);

  vtkDataObject* input = vtkDataObject::GetData(inputVector[0], 0);
  const double time_step = input->GetInformation()->Get(vtkDataObject::DATA_TIME_STEP());
  this->Internal->AddTimeStep(this->CurrentTimeIndex, time_step, input);
  this->UpdateProgress(static_cast<double>(this->CurrentTimeIndex) / this->NumberOfTimeSteps);

  // increment the time index
  this->CurrentTimeIndex++;
  if (this->CheckAbort() || this->CurrentTimeIndex == this->NumberOfTimeSteps)
  {
    this->PostExecute(request, inputVector, outputVector);
    delete this->Internal;
    this->Internal = nullptr;
  }

  return 1;
}

//------------------------------------------------------------------------------
void vtkExtractDataArraysOverTime::PostExecute(