[vtkusers] KeyPress Events / Callbacks / User Interaction

[Sebastian Gatzka]

Ok, and WHERE do I have to set this planeRepresentation member variabel 
like you suggested?

Am 12.03.2010 16:04, schrieb David Doria:
> On Fri, Mar 12, 2010 at 6:58 AM, Sebastian Gatzka
> <sebastian.gatzka at stud.tu-darmstadt.de>  wrote:
>    
>> Ok some updates: This is what I tried to change the widgets normal:
>>
>> // Define interaction style
>> class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
>> {
>>    public:
>>      static KeyPressInteractorStyle* New();
>>
>>      virtual void OnKeyPress()
>>      {
>>        //get the keypress
>>        vtkRenderWindowInteractor *rwi = this->Interactor;
>>        std::string key = rwi->GetKeySym();
>>
>>        if (key.compare("p") == 0)
>>        {
>>            planeRepresentation->SetNormal(1,0,0);
>>            planeWidget->SetRepresentation(planeRepresentation);
>>        }
>>
>>        //handle an arrow key
>>        if(key.compare("Up") == 0)
>>          {
>>          cout<<  "The up arrow was pressed."<<  endl;
>>          }
>>
>>        // forward events
>>        vtkInteractorStyleTrackballCamera::OnKeyPress();
>>      }
>>       vtkImplicitPlaneWidget2 *planeWidget;
>>      vtkImplicitPlaneRepresentation *planeRepresentation;
>> };
>>
>> Results in a crash when setting the normal.
>>
>>      
> You didn't show how you set the planeRepresentation member variable. I
> wouldn't do it like this, I would simply set the planeWidget member
> variable and then use:
>
> vtkImplicitPlaneRepresentation* rep = planeWidget->GetRepresentation();
>
> to do things to the representation.
>
> Thanks,
>
> David
>
>    
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