Method RequestData

Rendering/Annotation/vtkArcPlotter.cxx:56–242

}

int vtkArcPlotter::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
  vtkPolyData* input = vtkPolyData::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkPointData* inPD;
  vtkPoints* inPts;
  vtkCellArray* inLines;
  int j;
  vtkIdType numPts, i;
  double x[3], normal[3], point[3], aveNormal[3];
  vtkIdType id;
  const vtkIdType* pts = nullptr;
  vtkIdType npts = 0;
  double x1[3], x2[3], x21[3], n[3];
  vtkFloatArray* lineNormals;
  vtkPoints* newPts;
  vtkCellArray* newLines;
  double *range, offset;
  int plotNum, compNum;
  vtkPoints* projPts;

  inPD = input->GetPointData();

  // Initialize
  //
  vtkDebugMacro(<< "Plotting along arc");

  if (!(inPts = input->GetPoints()) || (numPts = inPts->GetNumberOfPoints()) < 1 ||
    !(inLines = input->GetLines()) || inLines->GetNumberOfCells() < 1)
  {
    vtkErrorMacro(<< "No input data!");
    return 0;
  }

  // Process attribute data to determine ranges, number of components, etc.
  if (this->ProcessComponents(numPts, inPD) <= 0)
  {
    return 0;
  }

  // Allocate points for projection
  //
  // Determine the projection plane. Project to a plane if camera is available
  // and defulat normal is not desired.
  if (this->Camera && !this->UseDefaultNormal)
  {
    double xProj[3];
    projPts = vtkPoints::New();
    projPts->SetNumberOfPoints(numPts);
    this->Camera->GetViewPlaneNormal(normal);
    this->Camera->GetFocalPoint(point);