[vtkusers] Can we add a check to see if we have at least 2 nodes when vtkContourWidget is in Manipulate state?

[andyjk]

I have the same problem. I can only add one point (the first) and even then,
the interactor crashes if I try to do more. Simple example below - basically
from
https://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolygonalSurfaceContourLineInterpolator
with a few lines added. Any reason why I cannot add nodes programatically ?
Thanks !

#include <vtkVersion.h>
#include "vtkSmartPointer.h"

#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkImageDataGeometryFilter.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkPolyDataCollection.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkTriangleFilter.h"
#include "vtkXMLPolyDataReader.h"

#include "vtkContourWidget.h"
#include "vtkOrientedGlyphContourRepresentation.h"
#include "vtkPolygonalSurfacePointPlacer.h"
#include "vtkPolygonalSurfaceContourLineInterpolator.h"


int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPolyData> polyData;
  if (argc < 2)
    {
    vtkSmartPointer<vtkSphereSource> sphereSource = 
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetThetaResolution(40);
    sphereSource->SetPhiResolution(20);
    sphereSource->Update();

    polyData = sphereSource->GetOutput();
    }
  else
    {
    vtkSmartPointer<vtkXMLPolyDataReader> reader = 
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(argv[1]);
    reader->Update();
    polyData = reader->GetOutput();
    }
      
  // The Dijkistra interpolator will not accept cells that aren't triangles
  vtkSmartPointer<vtkTriangleFilter> triangleFilter = 
    vtkSmartPointer<vtkTriangleFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  triangleFilter->SetInput( polyData );
#else
  triangleFilter->SetInputData( polyData );
#endif
  triangleFilter->Update();
  
  vtkSmartPointer<vtkPolyData> pd = triangleFilter->GetOutput();
  
  //Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(triangleFilter->GetOutputPort());
 
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetInterpolationToFlat();
  
  // Create the render window, renderer and interactor.
 
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
  
  // Add the actors to the renderer, set the background and size
  
  renderer->AddActor(actor);
  renderer->SetBackground (.3, .4, .5);

  // Here comes the contour widget stuff...

  vtkSmartPointer<vtkContourWidget> contourWidget = 
    vtkSmartPointer<vtkContourWidget>::New();
  contourWidget->SetInteractor(interactor);
  vtkSmartPointer<vtkOrientedGlyphContourRepresentation> rep = 
    vtkOrientedGlyphContourRepresentation::SafeDownCast(
      contourWidget->GetRepresentation());
  rep->GetLinesProperty()->SetColor(1, 0.2, 0);
  rep->GetLinesProperty()->SetLineWidth(3.0);

  vtkSmartPointer<vtkPolygonalSurfacePointPlacer> pointPlacer =
    vtkSmartPointer<vtkPolygonalSurfacePointPlacer>::New();
  pointPlacer->AddProp(actor);
  pointPlacer->GetPolys()->AddItem( pd );
  rep->SetPointPlacer(pointPlacer);

  vtkSmartPointer<vtkPolygonalSurfaceContourLineInterpolator> interpolator =
    vtkSmartPointer<vtkPolygonalSurfaceContourLineInterpolator>::New();
  interpolator->GetPolys()->AddItem( pd );
  rep->SetLineInterpolator(interpolator);
  
  renderWindow->Render();
  interactor->Initialize();

  contourWidget->EnabledOn();
  contourWidget->Initialize();
  contourWidget->EnabledOff();

  double pt1[3]; pt1[0] = -0.107433; pt1[1] = 0.112549; pt1[2] = 0.474558;
  contourWidget->SetWidgetState(vtkContourWidget::Define);
  contourWidget->GetContourRepresentation()->AddNodeAtWorldPosition(pt1);

  //double pt2[3]; pt2[0] = 0.187556; pt2[1] = 0.187556; pt2[2] = 0.42192;
  //contourWidget->GetContourRepresentation()->AddNodeAtWorldPosition(pt2);
 
  contourWidget->EnabledOn();
  interactor->Start();

  return EXIT_SUCCESS;
}



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