[vtkusers] How to use GetNextCell() and InitTraversal() to get cell elements?

[HayamiSanjuro]

Hi all,
I used vtkDelaunay2D to get a mesh and use vtkExtractEdges to get edges
...
vtkDelaunay2D del = vtkDelaunay2D::New();
...
vtkExtractEdges *extract = vtkExtractEdges::New();extract->SetInputConnection(del->GetOutputPort());
vtkPolyData *data = extract->GetOutput();
vtkCellArray *lineArray = data->GetLines();
 
If I want to get all lines from the lineArray, should I use functions like GetNextCell() and InitTraversal()
Can someone give me an example how GetNextCell() and InitTraversal() works? and esepecially the meaning of their parameters?
 
 
Thank you guys advance!
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