[vtkusers] Re: interaction with vtkWindow

[Aroosha Laghaee]

Hi,

Sorry for the late reply. I think you need two things 1) to pass your 
vtkRenderWindowInteractor to your execute function and 2) to get the 
value of the key pressed using vtkRenderWindowInteractor::GetKeyCode(). 
So your Execute function will need to look something like this:

virtual void Execute (vtkObject *caller,unsigned long,void * )
{
	vtkRenderWindowInteractor* iren = 
reinterpret_cast<vtkRenderWindowInteractor*>(Object);

	char key = iren->GetKeyCode();
	if(key=='m'){
		AfxMessageBox ("M is pressed.");
		//etc.
             }
}

Also try and use keys which are not already being used by 
vtkRenderWindowInteractor already. C is already used.

I hope this helps,
               Aroosha

> Hi Aroosha,
>
> I saw your post regarding interaction using 
> vtkRenderWindowInteraction. I'm doing somehting similar.
>
> The problem i faced is i do not know how to specify the char pressed.
>
> For eg, i only want the message box to appear when i pressed 'c'. 
> However, the message box will appear no matter which keys i pressed.
>
> I might have misunderstood the example codes somewhere. Can you offer 
> some advice?
>
> Thanks!
>
> PS: Below is my codes
>
> class ChairmanCallback :public vtkCommand {
> public:
>     static ChairmanCallback *New()
>          {return new ChairmanCallback;}
>     virtual void Execute (
>           vtkObject *caller,
>           unsigned long,
>           void * )
>           {
> 	AfxMessageBox ("C is pressed.");
>            }
> protected:
>     ChairmanCallback();
>     ~ChairmanCallback();
> };
>
> ChairmanCallback *callback_1 = ChairmanCallback::New();
> irenMain->AddObserver (vtkCommand::CharEvent, callback_1, 0);
> irenMain->Initialize();
> irenMain->Start();
>