[vtkusers] who 'observes' event?

[Amy Henderson]

Please keep the discussion on the mailing list.

The problem is that there has to be an event loop for events to be 
processed.  You either have to use iren->Start() or write your own event 
loop. The problem is not in the interactor style; events are sent to the 
interactor style from the render window interactor.  From 
vtkRenderWindowInteractor.h:

// vtkRenderWindowInteractor provides a platform-independent interaction
// mechanism for mouse/key/time events. It serves as a base class for
// platform-dependent implementations that handle routing of mouse/key/timer
// messages to vtkInteractorStyle and its subclasses.
// vtkRenderWindowInteractor also provides controls for picking,
// rendering frame rate, and headlights.

- Amy

At 11:52 AM 6/2/2004, you wrote:
>So I guess this is the problem then..? How do I get around this? Now am I 
>supposed to make my own InteractorStyle?  Or is there a simpler way to go 
>about this..?
>
>Below is the structure of my code (I am just switching between two scenes, 
>the "AnImportantFunction()" updates/modifies data in one renderer, and the 
>"AnotherImportantFunction" modifies data in the ohter renderer)
>
>
>CallbackCommand->SetCallback( MyClass::DoStuff(0 );
>Iren->AddObserver( vtkCommand::KeyPressEvent, CallbackCommand );
>
>int sample = 0;
>while(1)
>{
>
>         if ( Flag == 0 )
>         {
>                 AnImportantFunction(  sample );
>                 Iren->Render();
>                 sample++;
>         }
>         else
>         {
>                AnotherImportantFunction(  sample );
>                 sample++;
>                 Iren->Render();
>
>         }
>
>}
>
>
>
>void MyClass::DoStuff( vtkObject* caller, unsigned long eid, void* 
>clientdata, void* calldata)
>{
>
>        cout<<Flag <<endl;
>
>         Flag = !Flag;
>
>
>return;
>}
>
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