[vtkusers] how to pick vtkXYPlotActor points

[ly.zeng]

Hello everyone, 

 

   I just want to know how to pick points on vtkXYPlotActor,I found there
are some functions in vtkProp,

 

   SetPickAble(int);

   PickableOn();

 

   But I don't understand how to use them rightly. Maybe it is useful.
Anyone with any advice? Thank!

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