Function RequestData

Filters/ParallelDIY2/vtkProbeLineFilter.cxx:245–419

  }

  int RequestData(vtkInformation* vtkNotUsed(request), vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override
  {
    const double lineDistance =
      std::sqrt(vtkMath::Distance2BetweenPoints(this->P1.GetData(), this->P2.GetData()));
    vtkInformation* outInfo = outputVector->GetInformationObject(0);
    vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

    // Iterate on all inputs to :
    // - construct the array of valid inputs
    // - compute the total number of input points
    // - construct the structure of point data
    size_t totalNumberOfPoints = 0;
    std::vector<vtkPolyData*> inputs;
    std::vector<vtkDoubleArray*> lengthArrays;
    vtkNew<vtkPointData> outputPD;
    for (int cc = 0; cc < inputVector[0]->GetNumberOfInformationObjects(); cc++)
    {
      vtkPolyData* input = vtkPolyData::GetData(inputVector[0], cc);
      auto* inputPd = input->GetPointData();
      auto* arclength = vtkDoubleArray::SafeDownCast(inputPd->GetArray("arc_length"));
      for (int i = 0; i < inputPd->GetNumberOfArrays(); ++i)
      {
        auto* inputArray = inputPd->GetAbstractArray(i);
        const char* name = inputArray->GetName();
        if (inputArray != arclength && !outputPD->GetAbstractArray(name))
        {
          auto newArray = vtk::TakeSmartPointer(inputArray->NewInstance());
          newArray->SetName(name);
          newArray->SetNumberOfComponents(inputArray->GetNumberOfComponents());
          outputPD->AddArray(newArray);
        }
      }

      if (input->GetNumberOfPoints() == 0 || !arclength)
      {
        continue;
      }

      totalNumberOfPoints += input->GetNumberOfPoints();
      inputs.push_back(input);
      lengthArrays.push_back(arclength);
    }

    if (inputs.empty())
    {
      vtkNew<vtkPoints> outputPoints;
      outputPoints->InsertNextPoint(this->P1.GetData());
      outputPoints->InsertNextPoint(this->P2.GetData());
      vtkNew<vtkCharArray> validPointMask;
      validPointMask->SetName("vtkValidPointMask");
      validPointMask->InsertNextValue(0);
      validPointMask->InsertNextValue(0);
      vtkNew<vtkDoubleArray> arclength;
      arclength->SetName("arc_length");
      arclength->InsertNextValue(0.0);
      arclength->InsertNextValue(lineDistance);
      vtkNew<vtkPolyLineSource> polylineSource;