[vtkusers] Pick an edge on mouse click on a vtkactor (and convert that edge to a new actor)

[rwikee]

Hi, 
    Am working on a qt-vtk project . In viewport i plotted a vtkactor . That
actor consists of several vtkline cells , forming simple geometric
structures, like box / cube / triangle. I want to pick an edge as an actor
when mouse is clicked on that edge.

             A   ------------------------------------------  B
{ From a to b n number of cells are there, on click i want a vtkactor which
extends from A to B}


I tried vtkcellpicker . but it is returning only one cell, couldn't make
whole edge out of that.
I have tried vtkextractedges (Even though i saw it returns all edges instead
of one particular edge near to mouse click. ). 

Thanks
Rwik



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