[vtkusers] Programmatically adding and removing seeds from vtkSeedWidget

[Mauro Maiorca]

Hi Jeroen,

Sorry for the (quite) late reply, you might have already figured out
the solution by now. I'm replying just in case somebody else needs
this (I've got the same problem 3 hours and 3 coffees ago :D ), here
the solution:

     m_seedWidget->CompleteInteraction();

     // Remove current seeds:
     int numSeeds = m_seedRep->GetNumberOfSeeds ();
     for ( int i = 0; i < numSeeds; ++i )
     {
         m_seedRep->RemoveLastHandle();
         m_seedWidget->DeleteSeed (m_seedRep->GetNumberOfSeeds ());
// <---- NOTE!
     }


apparently DeleteSeed doesn't affect GetNumberOfSeeds, and
RemoveLastHandle doesn't affect vtkSeedList *Seeds; in
vtkSeedWidget.h!
By combining RemoveLastHandle and DeleteSeed it works perfectly!!
I hope this will reduce the daily caffeine intake in some other random
VTK users wondering in the list archive :-)

cheers,
Mauro


On Wed, Apr 29, 2009 at 5:21 PM,  <J.S.Wijnhout at lumc.nl> wrote:
> Hi all,
>
> This sounds like a dumb question, but I can't seem to figure it out myself.
> I'm using vtkSeedWidget to allow the user to set an arbitrary number of
> seeds. However I want to be able to, programmatically, delete all the seeds.
> Also, I need to programmatically add seeds to the vtkSeedWidget (for
> example, seeds read from a file). Can this be done using vtkSeedWidget? I
> have played with vtkSeedRepresentation, which has methods to remove and add
> handles. However the following approach leaves with an inconsistent state
> (It is a bit hard to describe, but seeds and handles to not seem to be
> synchronised well. New seeds often end up in the origin of my image.):
>
>     m_seedWidget->CompleteInteraction();
>
>     // Remove current seeds:
>     int numSeeds = m_seedRep->GetNumberOfSeeds ();
>     for ( int i = 0; i < numSeeds; ++i )
>     {
>         m_seedRep->RemoveLastHandle();
>     }
>
>     m_seedRep->BuildRepresentation();
>
>     // Add seeds from polydata:
>     vtkPolyData *seedPd = m_activeSlice->GetSeedPolyData(m_activeContour);
>     vtkPoints *seeds = seedPd->GetPoints();
>
>     if ( 0 != seeds )
>     {
>         numSeeds = seeds->GetNumberOfPoints();
>         for ( int i = 0; i < numSeeds; ++i )
>         {
>             double p[3];
>             seeds->GetPoint(i,p);
>             int s = m_seedRep->CreateHandle(p);
>             m_seedRep->SetSeedDisplayPosition(s,p);
>         }
>     }
>
>     m_seedRep->BuildRepresentation();
>     m_seedWidget->RestartInteraction();
>     m_seedWidget->Render();
>
> best,
> Jeroen
>
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