[vtkusers] Draw a simple spline

[Naxo Nuñez]

Hi!
I would like to draw a spline in a qvtkwidget, but without preset points, just during the interaction.
What I mean is just the user clicks a button where to start drawing a spline, and then begin the drawing by clicking on the qvtkwidget.
Then when finished, just double click or anything else to stop drawing.
Where should I start with?? How can I handle a spline?
Thanks!
 		 	   		  
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