Method RequestData

Filters/Extraction/vtkExtractSelectedArraysOverTime.cxx:100–182

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

  // get the output data object
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // is this the first request
  if (!this->IsExecuting)
  {
    vtkSelection* selection = vtkSelection::GetData(inputVector[1], 0);
    if (!selection)
    {
      return 1;
    }

    if (!this->DetermineSelectionType(selection))
    {
      return 0;
    }

    bool reportStats = this->ReportStatisticsOnly;
    switch (this->ContentType)
    {
      // for the following types were the number of elements selected may
      // change over time, we can only track summaries.
      case vtkSelectionNode::QUERY:
        reportStats = true;
        break;
      default:
        break;
    }

    this->ArraysExtractor->SetReportStatisticsOnly(reportStats);
    const int association = vtkSelectionNode::ConvertSelectionFieldToAttributeType(this->FieldType);
    this->ArraysExtractor->SetFieldAssociation(association);
    switch (association)
    {
      case vtkDataObject::POINT:
        this->ArraysExtractor->SetInputArrayToProcess(0, 0, 0, association, "vtkOriginalPointIds");
        break;
      case vtkDataObject::CELL:
        this->ArraysExtractor->SetInputArrayToProcess(0, 0, 0, association, "vtkOriginalCellIds");
        break;
      case vtkDataObject::ROW:
        this->ArraysExtractor->SetInputArrayToProcess(0, 0, 0, association, "vtkOriginalRowIds");
        break;
      default:
        this->ArraysExtractor->SetInputArrayToProcess(
          0, 0, 0, association, vtkDataSetAttributes::GLOBALIDS);
        break;
    }
    this->IsExecuting = true;