[vtkusers] deriving my own class from vtkActor

[Berk Geveci]

If you added the vtkTypeMacro to your class' header, you
can use SafeDownCast. This is much safer down static casting:

vtkActorCollection *actors = vtkRenderer->GetActors() ;
vtkActor *actor;

for (actors->InitTraversal();actor=actors->GetNextActor());)
    {
    vtkMyActor* myactor = vtkMyActor::SafeDownCast(actor);
    if (myactor)
        {
        actor->MyExtendedMethod();
        }
    // etc etc
    }

-Berk

On Sun, 2002-10-20 at 08:43, Steffen Oeltze wrote:
> 
> Malcolm Drummond wrote:
> 
> >Hi Steffen
> >
> >Try casting to your type of actor - the actor collection contains pointers
> >to type vtkActor.
> >
> Unfortunately, I'm not very familiar with C. How does casting work ? 
> What is the syntax ?
> 
> Steffen
> 
> >
> >
> >Malcolm
> >
> >----- Original Message -----
> >From: "Steffen Oeltze" <Steffen.Oeltze at Student.Uni-Magdeburg.DE>
> >To: "VTK users" <vtkusers at public.kitware.com>
> >Sent: Saturday, October 19, 2002 6:05 PM
> >Subject: [vtkusers] deriving my own class from vtkActor
> >
> >
> >>Dear VTK-users,
> >>
> >>I have derived my own class from vtkActor and I have added a couple of
> >>methods to this new class.
> >>After creating and modifying such a new actor I add it to my existing
> >>renderer. At some point I use
> >>vtkRenderer->GetActors() to retrieve my custom actors. Then, I would
> >>like to traverse the returned
> >>list and apply a custom method to each of my selfmade actors. However, I
> >>get the error:
> >>
> >>>'method' : is not an element of 'vtkActor'
> >>>
> >>I guess this is a problem of backward compatibility but I don't know how
> >>to solve it. Can anybody help me ?
> >>
> >>Steffen
> >>
> >>
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> >>
> >
> >
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