[vtkusers] Setting line color of contour widget

[KS Jothybasu]

Hi all,

How to set the color of the line drawn using vtkContourWidget. I uesd the
example in http://www.cmake.org/Wiki/VTK/Examples/Widgets/Cxx/ContourWidget.

Since there are no actor added to the renderer, I don't find any other
method in contour widge.getActor. it uses vtkPolyData to generate the line,
how to set the color of polydata.

Thanks

Jothy
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