[vtkusers] Programmatically adding and removing seeds from vtkSeedWidget

[J.S.Wijnhout at lumc.nl]

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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