[vtkusers] vtkChartXY picking

[dstivanov]

Hi Nicolas,

I offer you to use vtkPropPicker. The idea of all the picker classes is to
give you different vtkObject(prop, area, cell, volume, world point
coordinates) according to the 2D coordinates on the screen(on the rendering
window to be more precise). You can see the hierarchy of the
vtkAbstractPicker to get familiar with the different types of pickers. 

I think that if you use the proper picker you can take the element, situated
under the mouse pointer 2D coordinates(you will understand what I mean when
you read the documentation of the pickers) and after that manipulate it as
you wish. 

Greetings,
Mitko
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