[vtk-developers] vtkSeedWidget - seeds disappear

[Jean-Christophe Fillion-Robin]

Hi Daniel,

Using the macro VTK_CREATE(vtkClass, var) means:

vtkSmartPointer<vtkClass> var = vtkSmartPointer<vtkClass>::New()

It's also important to understand the smartpointer object will go out of
scope when the function  PlaceSeed seed returns. Assuming the created object
isn't referenced somewhere else, it will be deleted !

Just make sure you keep a reference of your object ...

Thks
Jc

On Tue, Aug 10, 2010 at 11:55 AM, Daniel Haehn <haehn at bwh.harvard.edu>wrote:

> Hi,
>
> I try to use the vtkSeedWidget in a displayableManager of Slicer4 with the
> following code:
>
>
> // Create vtkSeedWidget with display coordinates and directly add one seed
> void vtkMRMLAnnotationDisplayableManager::PlaceSeed(double x, double y)
> {
>  std::cout << "PlaceSeed" << x << ":" << y << std::endl;
>
>  VTK_CREATE(vtkSphereHandleRepresentation, handle);
>  handle->GetProperty()->SetColor(1,0,0);
>  handle->SetHandleSize(5);
>
>  VTK_CREATE(vtkSeedRepresentation, rep);
>  rep->SetHandleRepresentation(handle);
>
>  //seed widget
>  VTK_CREATE(vtkSeedWidget, seedWidget);
>  //seedWidget->CreateDefaultRepresentation();
>  seedWidget->SetRepresentation(rep);
>
>  seedWidget->SetInteractor(this->GetInteractor());
>  seedWidget->SetCurrentRenderer(this->GetRenderer());
>
>  double p[3];
>  p[0]=x;
>  p[1]=y;
>  p[2]=0;
>  //seedWidget->ProcessEventsOff();
>
>  vtkHandleWidget* newhandle = seedWidget->CreateNewHandle();
>
>
>  vtkHandleRepresentation::SafeDownCast(newhandle->GetRepresentation())->SetDisplayPosition(p);
>
>
>  //this->GetRenderer()->AddActor(newhandle->GetRepresentation());
>
>  //this->RequestRender();
>
>  seedWidget->On();
>
> }
>
>
> I tried different scenarios (see comments) but with the code above the
> small sphereHandles appear shortly and then directly disappear again.
>
> If I add the vtkHandleRepresentation as an actor to the renderer, the
> sphereHandles appear until I rotate or zoom the 3D Render Window.
>
> What am I doing wrong? As a side note: it does not make a difference if I
> call RequestRender() or not. I don't know if I might be using VTK wrong or
> if there is a problem in combination with the displayableManager.
>
>
> Thank you so much!!
>
> Daniel




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