[vtk-developers] Mouse wheel support in VTK

[Jeff Lee]

Mathieu Malaterre wrote:

> 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 can do this, or help you if you like.
-Jeff

> 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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>
>
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