[vtkusers] create and delete vtkActor and vtk3DWidget

[Weiguang guan]

I actually don't know how to remove widgets (for example vtkBoxWidget) 
properly. After
     vtkBoxWidget *boxWidget = vtkBoxWidget::New();
     boxWidget->SetInteractor(iren);
Shall I do
     boxWidget->SetInteractor(NULL);
     boxWidget->UnRegister(iren);
     boxWidget->Delete();
to remove it? I see boxWidget is still alive because its ReferenceCount 
is 1 not 0.

I don't mind moving up to use vtkSmartPointer if that can solve my problem.

Weiguang

On 26/02/2016 11:00 AM, Thales Luis Rodrigues Sabino wrote:
> The way I'm doing things is just to remove the actors from the renderer.
> Since I'm sure my program doesn't hold any other reference, I do trust 
> that the vtkSmartPointer is doing its job.
>
> On Thu, Feb 25, 2016 at 5:51 PM, Weiguang guan 
> <guanw at rhpcs.mcmaster.ca <mailto:guanw at rhpcs.mcmaster.ca>> wrote:
>
>     Hello,
>
>     In my program (C++), a user can create/remove an object (cone,
>     cylinder, ...) or a widget (vtkBoxWidget, ...). What's the right
>     way of doing so without causing memory leaking or trashing?
>
>     In "Examples/Tutorial/Step6/Cxx/Cone6.cxx", I see the last section
>     of code doing clean-up at the end as follows:
>      170   cone->Delete();
>      171   coneMapper->Delete();
>      172   coneActor->Delete();
>      173   callback->Delete();
>      174   boxWidget->Delete();
>      175   ren1->Delete();
>      176   renWin->Delete();
>      177   iren->Delete();
>      178   style->Delete();
>     when it exits.
>
>     Lines 170-172 won't delete coneActor because ren1 still use it 99
>     ren1->AddActor( coneActor ). This example works fine as it delete
>     ren1, renWin, and iren as well at exit point. Shall I do
>     ren1-RemoveActor(coneActor) in addtion to coneActor->Delete()? I
>     just want to "undo" the creation as if cone had never been created.
>
>     How about the widget boxWidget? It may be trickier. In addition to
>     boxWidget->Delete(), do I need to do something like
>     boxWidget->SetInteractor(NULL);
>     boxWidget->UnRegister(iren);
>     ?
>
>     Weiguang
>
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> -- 
> Thales Luis Rodrigues Sabino
>
> PhD Student at PGMC-UFJF <http://www.ufjf.br/pgmc/>
> Lattes <http://lattes.cnpq.br/0601030410417146> | LinkedIn 
> <https://br.linkedin.com/in/tluisrs> | ResearchGate 
> <https://www.researchgate.net/profile/Thales_Luis_Sabino>

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