[vtk-developers] Mouse wheel support in VTK

[Mathieu Malaterre]

Ok I like that.

I made some changes to the Wrapping directory, but I realize there is 
still lots of works.
For example I don't know how to do write a mouse wheel listener in Java.
I haven't also updated the Qt and GTK RWI, as I don't know much of the API.

Mathieu

Sebastien BARRE wrote:
> At 1/28/2004 09:58 AM, Mathieu Malaterre wrote:
> 
>> Commit has been done.
> 
> 
> I added a quick (and I hope not too dirty) support for mouse wheel in 
> the default camera interactor styles. "Wheel forward" will zoom in, 
> "backward" will zoom out.
> 
> in vtkInteractorStyle, I added:
>   virtual void OnMouseWheelForward() {};
>   virtual void OnMouseWheelBackward() {};
> 
> as well as a MouseWheelMotionFactor so that some control can be achieved 
> on what a "mouse wheel motion step" represents (i.e, it's a multiplier, 
> you can change it to specify how much of a change a wheel motion step 
> represents).
> 
> In vtkInteractorStyleJoystickCamera and 
> vtkInteractorStyleTrackballCamera, those 2 functions are overriden to 
> perform zoom in/zoom out. The same thing could be done for the other 
> interactor styles.
> 
> On the 3D widgets side (which inherit from vtkInteractorObserver, not 
> vtkInteractorStyle), you can just update your ProcessEvents() to listen 
> for MouseWheelForwardEvent, and MouseWheelBackwardEvent, and act 
> accordingly.
> 
> 
> -- 
> Sebastien Barre
> 
> 
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