Method RequestData

Infovis/Core/vtkStreamGraph.cxx:50–104

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

//------------------------------------------------------------------------------
int vtkStreamGraph::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkInformation* input_info = inputVector[0]->GetInformationObject(0);
  vtkGraph* input = vtkGraph::SafeDownCast(input_info->Get(vtkDataObject::DATA_OBJECT()));

  // Copy structure into output graph.
  vtkInformation* outputInfo = outputVector->GetInformationObject(0);
  vtkGraph* output = vtkGraph::SafeDownCast(outputInfo->Get(vtkDataObject::DATA_OBJECT()));

  double progress = 0.1;
  this->InvokeEvent(vtkCommand::ProgressEvent, &progress);

  // First pass: make a copy of the graph and we're done
  if (!this->CurrentGraph->GetGraph())
  {
    if (vtkDirectedGraph::SafeDownCast(input))
    {
      vtkSmartPointer<vtkMutableDirectedGraph> g = vtkSmartPointer<vtkMutableDirectedGraph>::New();
      this->CurrentGraph->SetGraph(g);
    }
    else
    {
      vtkSmartPointer<vtkMutableUndirectedGraph> g =
        vtkSmartPointer<vtkMutableUndirectedGraph>::New();
      this->CurrentGraph->SetGraph(g);
    }
    this->CurrentGraph->GetGraph()->DeepCopy(input);
    if (!output->CheckedShallowCopy(input))
    {
      vtkErrorMacro("Output graph format invalid.");
      return 0;
    }
    return 1;
  }

  progress = 0.2;
  this->InvokeEvent(vtkCommand::ProgressEvent, &progress);

  this->MergeGraphs->SetUseEdgeWindow(this->UseEdgeWindow);
  this->MergeGraphs->SetEdgeWindowArrayName(this->EdgeWindowArrayName);
  this->MergeGraphs->SetEdgeWindow(this->EdgeWindow);

  if (!this->MergeGraphs->ExtendGraph(this->CurrentGraph, input))
  {
    return 0;
  }

  progress = 0.9;
  this->InvokeEvent(vtkCommand::ProgressEvent, &progress);

  output->DeepCopy(this->CurrentGraph->GetGraph());

  return 1;
}

//------------------------------------------------------------------------------
void vtkStreamGraph::PrintSelf(ostream& os, vtkIndent indent)