Method RequestData

Infovis/Core/vtkTableToGraph.cxx:347–839

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//------------------------------------------------------------------------------
int vtkTableToGraph::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // Check that the link graph is valid
  if (!this->ValidateLinkGraph())
  {
    return 0;
  }

  // Extract edge table
  vtkInformation* edgeTableInfo = inputVector[0]->GetInformationObject(0);
  vtkTable* edgeTable = vtkTable::SafeDownCast(edgeTableInfo->Get(vtkDataObject::DATA_OBJECT()));

  // Extract vertex table
  vtkInformation* vertexTableInfo = inputVector[1]->GetInformationObject(0);
  vtkTable* vertexTable = nullptr;
  if (vertexTableInfo)
  {
    vertexTable = vtkTable::SafeDownCast(vertexTableInfo->Get(vtkDataObject::DATA_OBJECT()));
  }

  if (vtkArrayDownCast<vtkIntArray>(this->LinkGraph->GetVertexData()->GetAbstractArray("active")))
  {
    // Extract only the active link graph.
    vtkSelection* activeSel = vtkSelection::New();
    vtkSelectionNode* activeSelNode = vtkSelectionNode::New();
    activeSel->AddNode(activeSelNode);
    activeSelNode->SetContentType(vtkSelectionNode::VALUES);
    activeSelNode->SetFieldType(vtkSelectionNode::VERTEX);
    vtkIntArray* list = vtkIntArray::New();
    list->SetName("active");
    list->InsertNextValue(1);
    activeSelNode->SetSelectionList(list);
    vtkExtractSelectedGraph* extract = vtkExtractSelectedGraph::New();
    extract->SetInputData(0, this->LinkGraph);
    extract->SetInputData(1, activeSel);
    extract->Update();
    vtkGraph* g = extract->GetOutput();
    this->LinkGraph->ShallowCopy(g);
    list->Delete();
    activeSel->Delete();
    activeSelNode->Delete();
    extract->Delete();
  }

  vtkStringArray* linkColumn =
    vtkArrayDownCast<vtkStringArray>(this->LinkGraph->GetVertexData()->GetAbstractArray("column"));

  if (!linkColumn)
  {
    vtkErrorMacro("The link graph must have a string array named \"column\".");
    return 0;
  }

  vtkStringArray* linkDomain =
    vtkArrayDownCast<vtkStringArray>(this->LinkGraph->GetVertexData()->GetAbstractArray("domain"));
  vtkBitArray* linkHidden =
    vtkArrayDownCast<vtkBitArray>(this->LinkGraph->GetVertexData()->GetAbstractArray("hidden"));