[vtkusers] Question about vtkInteractorStyleUser

[Elvis Stansvik]

2016-02-25 11:13 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-02-25 11:02 GMT+01:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>
>> Hi,
>>
>> I found this old thread about vtkInteractorStyleUser:
>>
>>     http://www.vtk.org/pipermail/vtkusers/2010-September/062584.html
>>
>> In it, David Gobbi explained:
>>
>> > The vtkInteractorStyleUser is still the correct way to write a fully
>> > customized vtkInteractorStyle in the wrapper languages.  It isn't the
>> > only option, i.e. you can add observers to the other interactor
>> > styles, but it is different from the rest because it doesn't define
>> > any "default" interaction of its own.
>>
>> Is this still true?
>>
>> In my case, I have a large, roughly cylindrical volume (tomography of a
>> drill core), where the camera should only ever see the cylinder from the
>> side, with the line of sight perpendicular to the center line of the core.
>> Rotation of the camera should also be limited to rotation around the center
>> line of the core (z axis), with no possibility of roll, and I think I want
>> to support this rotation only through a Qt slider, not by mouse interaction
>> in the VTK window. Movement of the camera (and focal point) up and down the
>> core should be through a Qt scrollbar. The last camera operation I want to
>> support is zooming, and just like with rotation, I'd like this to be done
>> through a Qt slider.
>>
>> Apart from that, I only want to selectively add certain interactions in
>> the VTK window, to allow the user to annotate the core visually by adding
>> markers of various kinds through mouse clicks and click-drags.
>>
>> It's because the set of interactions I want to support in the VTK window
>> are so few, and quite specialized, I was looking at vtkInteractorStyleUser.
>> Does it seems reasonable to use this interactor style in my case, or are
>> there other approaches I should consider?
>>
>> The only example I can find of vtkInteractorStyleUser usage is this C++
>> example:
>>
>>
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/InteractorStyleUser
>>
>> But it seems this example just sets the vtkInteractorStyleUser on the
>> interactor, not really making use of it (e.g. overriding its virtual On*
>> methods)? Instead it adds observers to the interactor itself. Or is setting
>> a vtkInteractorStyleUser on the interactor a prerequisite to be able to
>> observe those events in this way?
>>
>> Thankful for any advice / clarifications on how vtkInteractorStyleUser is
>> meant to be used.
>>
>
> An additional question: As a test, I just tried setting a
> vtkInteractorStyleUser as the style my vtkGenericRenderWindowInteractor
> (I'm using the QVTKRenderWindowInteractor from Python), instead of the
> vtkInteractorStyleImage I was using before (I'm mapping a slice of the core
> with a vtkImageResliceMapper), and with the vtkInteractorStyleUser set, the
> window does not render anything when I call Render() and Start() the
> interactor.
>

Sorry, this was a PEBCAK. I had a stray Disable() call left in from some
testing.

Elvis


>
> Is this to be expected when using the vtkInteractorStyleUser? The
> interactor shouldn't affect rendering, should it? How can I get back
> rendering when using vtkInteractorStyleUser?
>
> Elvis
>
>
>> Cheers,
>> Elvis
>>
>
>
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