[vtkusers] annotatepick.tcl to annotatepick.cxx

[Obada Mahdi]

Hi Gilbert!

On Thu, 19 Jan 2006, Gilbert Mensah wrote:
> I tried doing it but i'm having problems with how
> AddObserver works in c++,that is passing that
> annotatepick function as they did PROC annotatepick in
> tcl.Really need your help.Thanks

The AddObserver method expects a vtkCommand-compatible instance, whose
`Execute' method is invoked when the event is dispatched.  To get your own
function called, you can set up a `vtkCallbackCommand' accordingly and pass it
to `AddObserver':

|	picker = vtkCellPicker::New();
|	annotatePickCallback = vtkCallbackCommand::New();
|	annotatePickCallback->SetCallback(annotatePick);
|	annotatePickCallback->SetClientData(this);
|	picker->AddObserver(vtkCommand::EndPickEvent, annotatePickCallback);

where `annotatePickCallback' is your own function, which has to accept four
parameters, one of which is set to whatever you provided via `SetClientData'.
This mechanism is needed to pass custom data to your callback function.

> Can anyone help me convert annotatepick.tcl to
> annotatepick.cxx.

I have attached a C++ version of "annotatePick.tcl".

Feel free to contact me directly for further questions.


Regards

Obada
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