[vtk-developers] deprecate vtkInteractorStyleTrackball

[Sebastien BARRE]

Hi

I think we should deprecate the vtkInteractorStyleTrackball class. It is, 
at least, duplicated code (and for some functions triple code). It might be 
confusing for VTK users to leave this whole pice of nasty code here, and 
it's a pain to maintain.

What about we make it derived from vtkInteractorStyleSwitch and just write 
the constructor so that it sets the switch to trackball mode automatically 
(and issue a "deprecated" warning). The functionality, as far as I know, 
would be the same.

I'll commit a new round of interactor-styles clean-up tonite or tomorrow.

--
Sebastien Barre