[vtkusers] Track lines draw using vtkLineWidget2

ran kor1581 at gmail.com
Thu Feb 1 05:40:36 EST 2018

I'm using vtkLineWidget2 to draw a number lines in vtkResliceImageViewer
render window. 
After drawing the line when it moves using mouse interactions,  I need to
collect its new coordinates.
For this need to identify which line has moved.  I'm using interaction
callback to track the movement. But as the render window contains more than
one drawn line,  how can track which line has selected for moving?   

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