[vtkusers] Chart: coordinate conversions

[nclemeur]

Hello,

Is there an easy way to convert the coordinate contained in a
vtkContextMouseEvent into the world coordinate for a vtkChartXY. I have
tried using the static method 
vtkInteractorObserver::ComputeDisplayToWorld(...) which seemd to be the
recommended way for normal 3D object. But it does not seems to work (ie the
value are not really the ones I am expecting).

Cheers,

Nicolas
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