[vtkusers] Mouse wheel support in VTK

[Mathieu Malaterre]

Hi all,

	A long time ago I sent to the vtkusers list, a patch to support mouse 
wheel event in VTK, but I couldn't test it under Mac. After a lot of 
problems and a lots of help from Chris Scharver I was able to verify it 
worked under Mac + Cocoa.

	So this patch has been successfully tested under:

- Unix/ Linux (including Tcl)
- Windows 2000 and XP
- Mac Cocoa
- Mac Carbon

	Also for the Unix port, there is an interesting thread I had with Charl 
P. Botha, which explains how this event is -badly- handled under X11:
	http://vtk.org/pipermail/vtkusers/2003-August/019537.html

	I also attached to this mail an example in Tcl, python and cxx.

	I would like to apply it sometime next week. Comments /suggestions 
welcome. Maybe the convention can be inverted, I choose to call 
'Forward' an event when 'scrolling up' the mouse wheel.

Thanks,
Mathieu

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