[vtkusers] vtkInteractorStyle : inherit from two vtkInteractorStyle

[David Doria]

On Wed, Mar 23, 2011 at 1:04 PM, nsarrasin <nsarrasin at phenix-systems.com> wrote:
> hi all,
>
> I am building my own vtkInteractorStyle for my vtkRenderWindow.
>
> I have first inherited from vtkInteractorStyleTrackballActor to be able to
> rotate each actor independently.
> Then I call Spin() instead of Rotate() to constrain the rotation to be in
> the plane view.
>
> Here is my working code :
>
> class myInteractor : public vtkInteractorStyleTrackballActor
> {
>  public:
>
>    static myInteractor * New();
>    vtkTypeRevisionMacro(myInteractor , vtkInteractorStyleTrackballActor);
>
>    myInteractor () :
>    {
>    }
>
>    virtual void Rotate()
>    {
>        vtkInteractorStyleTrackballActor::Spin();
>    }
> };
> vtkCxxRevisionMacro(myInteractor , "$Revision: 1.1 $");
> vtkStandardNewMacro(myInteractor );
>
> Now I would like to add a "Zoom all the actor together" function.
> This function doesn't exist in vtkInteractorStyleTrackballActor (where it is
> "Zoom one actor at time") but in other style like
> vtkInteractorStyleTrackballCamera for example.
>
> So I was thinking of inheriting from a second InteractorStyle but I don't
> know how to proceed with vtkTypeRevisionMacro which only takes two
> arguments.
>
> How can I manage my problem ?
> Maybe it's not the right way to do ?
>
> Thanks by advance for reading/helping me.
>
> Nicolas.

I believe it is no-no to use multiple inheritance in VTK. Can you just
call the functions manually in your custom interactor style? I.e. why
does it need to be inherited?

David