Method StartLayoutAnimation

Views/Infovis/vtkGraphItem.cxx:298–324

}

void vtkGraphItem::StartLayoutAnimation(vtkRenderWindowInteractor* interactor)
{
  // Start a simple repeating timer
  if (!this->Internal->Animating && interactor)
  {
    if (!this->Internal->AnimationCallbackInitialized)
    {
      this->Internal->AnimationCallback->SetClientData(this);
      this->Internal->AnimationCallback->SetCallback(vtkGraphItem::ProcessEvents);
      interactor->AddObserver(vtkCommand::TimerEvent, this->Internal->AnimationCallback, 0);
      this->Internal->Interactor = interactor;
      this->Internal->AnimationCallbackInitialized = true;
    }
    this->Internal->Animating = true;
    // This defines the interval at which the animation will proceed. 60Hz?
    this->Internal->TimerId = interactor->CreateRepeatingTimer(1000 / 60);
    if (!this->Internal->GravityPointSet)
    {
      vtkVector2f screenPos(
        this->Scene->GetSceneWidth() / 2.0f, this->Scene->GetSceneHeight() / 2.0f);
      vtkVector2f pos = this->MapFromScene(screenPos);
      this->Layout->SetGravityPoint(pos);
      this->Internal->GravityPointSet = true;
    }
    this->Layout->SetAlpha(this->Internal->LayoutAlphaStart);
  }
}

void vtkGraphItem::StopLayoutAnimation()
{