[vtkusers] switch interactor style depending on mouse position

[Darshan Pai]

You will probably need to subclass the vtkInteractorStyleSwitch .
Within the new subclass , I think you can specify some kind of picking
operation. And depending on if you picked a prop, you can use that as a
predicate for choosing trackball camera or trackball actor .

I do not know if there is anything builtin which does what you are asking
for .

Regards
Darshan

On Thu, Mar 22, 2012 at 5:15 PM, Thomas Ka <t-ka at gmx.net> wrote:

> Hello list!
>
> Can you help me with the following problem?
>
> I'd like to use an interactor style that works like a
> vtkInteractorStyleTrackballActor (move the actor) when the mouse is dragged
> above an actor, and when the mouse is dragged above the background the
> style should work like a vtkInteractorStyleTrackballCamera (move/rotate the
> scene).
>
> Does such a style exist in VTK? If not, how can I build it? Is it possible
> to use a vtkInteractorStyleSwitch and call its methods
> SetCurrentStyleToTrackballActor/Camera at the beginning of each drag
> operation? How can I detect whether the dragging is performed above an
> actor or not? If possible, please give a link to some code snippets.
>
> Thank you for any comment!
> Thomas
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