[vtk-developers] [slicer-devel] vtkSeedWidget - seeds disappear

[Stephen Aylward]

+1

On Tue, Aug 10, 2010 at 12:30 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> This is an argument not to use macros. One can easily forget what is
> hidden inside. Certainly for vtkSmartPointer, saving a few keystrokes
> may not be worth it. Yes, you still need to understand smart pointers,
> but this macro and others I have seen to save stkoes with
> vtkSmartPointer's, can add further confusion.
>
> Just my opinion,
>
> Bill
>
> On Tue, Aug 10, 2010 at 12:25 PM, Daniel Haehn <haehn at bwh.harvard.edu> wrote:
>> 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
>>>
>>>
>>>
>>>
>>>--
>>>Phone: 1-518-836-2174
>>>Ext: 304
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-- 

==============================
Stephen R. Aylward, Ph.D.
Director of Medical Imaging Research
Kitware, Inc. - North Carolina Office
http://www.kitware.com
stephen.aylward (Skype)
(919) 969-6990 x300