[vtk-developers] changes to interactor styles

[Amy Henderson]

I've made some changes to the interactor styles.  Each of the different 
styles (JoystickCamera, JoystickActor, TrackballCamera, and TrackballActor) 
now has its own class, and there is another class, 
vtkInteractorStyleSwitch, that swaps between them.  Currently, this seems 
to be working on Linux, and it compiles on PC, but the two Actor styles 
aren't working correctly there yet.  Once this is working, the class 
vtkInteractorStyleTrackball will be obsolete because the functionality will 
be handled by the 4 subclasses of vtkInteractorStyle 
(vtkInteractorStyleJoystickCamera, etc.) instead.

Amy