[vtkusers] vtkInteractionStyle

[verena kinder]

OK I test the Observer!

class code:

class vtkMyInter : public vtkCommand
{
public:
  static vtkMyInter *New()
    { return new vtkMyInter; }
  virtual void Execute(vtkObject *caller, unsigned long, void*)
    {
      cout << "W press"<< endl;


    }
};

and the main:

    vtkMyInter *mo1 = vtkMyInter::New();
    iren->RemoveObservers ( vtkCommand::KeyPressEvent );
    iren->AddObserver ( vtkCommand::KeyPressEvent, mo1 );
  iren->Initialize();
     iren->Start();

But how can I make my program reacts only on the KeyPressEvent 'w'?
In this moment it reacts whenever I press a key.
And in this moment I only use cout in my method, but is it also possible to change the background from the Renderer or something like that?

Thanks
Verena

"Markus Erbacher" <Markus.Erbacher at gmx.de> schrieb am 13.04.05 16:44:40:
> 
> Hi Verena,
> 
> I don't know about Interactorstyles, but if you just want to get the
> keypressevent, you could also create an Observer. All you need to do is to
> derive your class from vtkCommand. 
> 
> class Observer : public vtkCommand
> {
> public:
>   virtual void Execute(vtkObject* Wdg, unsigned long Event, void* Calldata);
> };
> 
> In Execute you can then call cout<<"You press the W key "<<endl;
> 
> To use the Observer you must register it with the interactor you are using.
> To do so delete the old Observer for the keypressed-event from the
> Interactor an replace it with the new one. Looks like this:
> 
> Interactor->RemoveObservers ( vtkCommand::KeyPressEvent );
> Interactor->AddObserver ( vtkCommand::KeyPressEvent, NewObserverExtra );
> 
> 
> Markus
> 
> > Hello!
> > 
> > In order to interact to my render Window by keypress I derive a class
> > vtkMyInteractorStyle from vtkInteractorStyle.
> > 
> > Code vtkMyInteractorStyle.h:
> > #ifndef __vtkMyInteractorStyle_h
> > #define __vtkMyInteractorStyle_h
> > 
> > #include "vtkInteractorStyle.h"
> > 
> > class vtkMyInteractorStyle : public vtkInteractorStyle
> > {
> > public:
> >   
> >   virtual void OnChar();
> > };
> > 
> > #endif
> > 
> > Code vtkMyInteractorStyle.cxx:
> > 
> > #include "vtkMyInteractorStyle.h"
> > 
> > #include "vtkCallbackCommand.h"
> > #include "vtkCommand.h"
> > #include "vtkObjectFactory.h"
> > #include "vtkRenderWindowInteractor.h"
> > 
> > #include <iostream>
> > using namespace std;
> > 
> > 
> >
> //----------------------------------------------------------------------------
> > void vtkMyInteractorStyle::OnChar()
> > {
> >   switch (this->Interactor->GetKeyCode())
> >     {
> >     case 'w':
> >     case 'W':
> >       cout<<"You press the W key "<<endl;
> >       break;
> >     }
> > }
> > 
> > code from the main:
> > ......
> > #include "vtkMyInteractorStyle.h"
> > #include "vtkInteractorStyleSwitch.h"
> > 
> > #include <iostream>
> > using namespace std;
> > 
> > 
> > int main (int argc, char **argv)
> > {
> >   
> > /**********************************************************
> > SET RENDER WINDOW and INTERCTION VALUES
> > ************************************************************/
> >   vtkRenderer *aRenderer = vtkRenderer::New();
> >   aRenderer->SetBackground(1.0,0.0,0.0);
> >   vtkRenderWindow *renWin = vtkRenderWindow::New();
> >     renWin->AddRenderer(aRenderer);
> >   vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
> >     iren->SetRenderWindow(renWin);
> >     vtkMyInteractorStyle *style=vtkMyInteractorStyle::New();
> >     iren->SetInteractorStyle(style);
> > /***************************************************************/
> > .......
> > 
> > 
> > 
> > /**************************************START
> > RENDERING*******************************/
> > 
> >      aRenderer->AddProp(vol);
> >      aRenderer->AddActor(axesActor);
> >      renWin->Render();
> >   // Initialize the event loop and then start it.
> >      iren->Initialize();
> >      iren->Start();
> > 
> > 
> >
> /*************************************DELETE******************************************/
> >  
> >   return 0;
> > 
> > }
> > 
> > But if I set : 
> > 	iren->SetInteractorStyle(style);
> > I overwrite the exsisting interactions like zooming with the mouse and so
> > on.
> > But that I dont't want because I need them.
> > 
> > How can I handle this problem?
> > What function shall I add to my class?
> > 
> > Thanks !
> > 
> > Verena  
> > 
> > 
> > 
> > 
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