[vtkusers] KeyPress Events / Callbacks / User Interaction

[Sebastian Gatzka]

Just great this worked!

But as I want to change the normal and center of the 
vtkImplicitPlaneWidget2 I need to access its representation.
There I can set the things I want:

vtkImplicitPlaneRepresentation *iPlaneRepresentation = 
vtkImplicitPlaneRepresentation::New();
iPlaneRepresentation->SetPlaceFactor(1.0); // This must be set prior to 
placing the widget
iPlaneRepresentation->PlaceWidget(sGrid->GetBounds());
iPlaneRepresentation->SetNormal(0,0,1);
iPlaneRepresentation->SetOrigin(sGrid->GetCenter());
iPlaneRepresentation->SetOutlineTranslation(0);
iPlaneRepresentation->SetDrawPlane(0);

So how can I have access to the representation itself from withing the 
class KeyPressInteractorStyle?

Am 10.03.2010 15:28, schrieb David Doria:
> On Wed, Mar 10, 2010 at 6:36 AM, Sebastian Gatzka 
> <sebastian.gatzka at stud.tu-darmstadt.de 
> <mailto:sebastian.gatzka at stud.tu-darmstadt.de>> wrote:
>
>     Hello world.
>
>     I have found the example for the catching of keys:
>     http://vtk.org/Wiki/VTK/Examples/Interaction/KeypressEvents
>     This is great news to me, but I want to link different things:
>
>         * Wait for a key to be pressed
>         * On one special key press change the normal direction of a
>           vtkImplicitPlaneWidget2 representation
>         * On a different special key press change the center point of
>           a vtkImplicitPlaneWidget2 representation
>         * Write the new normal direction and center point of the
>           vtkImplicitPlaneWidget2 representation to a textActor to
>           display the new values
>
>     So I think I will have to link key press events and callbacks?
>     I'm really not sure how to handle this on my own
>
>     You will notice that my previous posts are somhow related to the
>     topic.
>     This here is the final requirement to the code and include the
>     steps I have asked before.
>
>     Sebastian
>
>
> You need to create a member variable of type vtkImplicitPlaneWidget2* 
> in the interactor style subclass:
>
> class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
> {
>   public:
>     static KeyPressInteractorStyle* New();
>     virtual void OnKeyPress()
>     {
>       //get the keypress
>       vtkRenderWindowInteractor *rwi = this->Interactor;
>       std::string key = rwi->GetKeySym();
>       //handle a "normal" key
>       if(key.compare("a") == 0)
>         {
>         cout << "The a key was pressed." << endl;
>         }
>       // forward events
>       vtkInteractorStyleTrackballCamera::OnKeyPress();
>     }
>  vtkImplicitPlaneWidget2* PlaneWidget;
> };
>
>
> Then from main:
>
> vtkImplicitPlaneWidget2* planeWidget = vtkImplicitPlaneWidget2::New();
> KeyPressInteractorStyle* style = KeyPressInteractorStyle::New();
> style.PlaneWidget = planeWidget;
>
> Then you can do whatever you want to the PlaneWidget from inside
>
>       if(key.compare("a") == 0)
>         {
> //do something to the PlaneWidget when 'a' is pressed
>         }
>
> Thanks,
>
> David
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