Method RequestData

Views/Infovis/vtkParallelCoordinatesRepresentation.cxx:376–501

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

//------------------------------------------------------------------------------
int vtkParallelCoordinatesRepresentation::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* vtkNotUsed(outputVector))
{
  vtkDebugMacro(<< "begin request data.\n");

  // get the info objects and input
  vtkInformation* inDataInfo = inputVector[INPUT_DATA]->GetInformationObject(0);
  vtkInformation* inTitleInfo = inputVector[INPUT_TITLES]->GetInformationObject(0);

  if (!inDataInfo)
    return 0;

  vtkDataObject* inputData = inDataInfo->Get(vtkDataObject::DATA_OBJECT());
  if (!inputData)
    return 0;

  // pull out the title string array
  vtkStringArray* titles = nullptr;
  if (inTitleInfo)
  {
    vtkTable* inputTitles = vtkTable::SafeDownCast(inTitleInfo->Get(vtkDataObject::DATA_OBJECT()));
    if (inputTitles && inputTitles->GetNumberOfColumns() > 0)
    {
      titles = vtkArrayDownCast<vtkStringArray>(inputTitles->GetColumn(0));
    }
  }
  // build the input array table.  This is convenience table that gets used
  // later when building the plots.
  if (this->GetInput()->GetMTime() > this->BuildTime)
  {
    if (inputData->IsA("vtkArrayData"))
    {
      vtkSmartPointer<vtkArrayToTable> att = vtkSmartPointer<vtkArrayToTable>::New();
      att->SetInputData(inputData);
      att->Update();

      this->InputArrayTable->ShallowCopy(att->GetOutput());
    }
    else
    {
      vtkInformationVector* inArrayVec = this->Information->Get(INPUT_ARRAYS_TO_PROCESS());

      if (!inArrayVec)
      {
        vtkErrorMacro(<< "No input arrays specified.  Use SetInputArrayToProcess(i,...).");
        return 0;
      }

      int numberOfInputArrays = inArrayVec->GetNumberOfInformationObjects();

      if (numberOfInputArrays <= 0)
      {
        vtkErrorMacro(<< "No input arrays specified.  Use SetInputArrayToProcess(i,...).");
        return 0;
      }

      this->InputArrayTable->Initialize();