[vtk-developers] vtkSeedWidget - seeds disappear

[Daniel Haehn]

Hi jc,

This makes sense! Thank you so much!

Daniel

Jean-Christophe Fillion-Robin <jchris.fillionr at kitware.com> wrote:

>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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