[vtkusers] Information during callback / vtkImplicitPlaneWidget2

[David Doria]

On Fri, Mar 5, 2010 at 8:47 AM, Sebastian Gatzka <
sebastian.gatzka at stud.tu-darmstadt.de> wrote:

>  How is that possible.
> I'm not understanding the syntax of the callback function.
> I'm afraid I can't alter it myself ...
>
>
The idea is that you just need to give the callback function access to the
thing you want to change. Everything is a pointer in VTK, so if you give the
callback function a pointer to something, you can then modify the object
that the pointer points to from the callback function and it modifies the
actual object.

    vtkIPWCallback():Plane(0),Actor(0),TextActor(0) {}
    vtkPlane *Plane;
    vtkActor *Actor;
    vtkTextActor *TextActor;

...

  vtkSmartPointer<vtkIPWCallback> myCallback =
      vtkSmartPointer<vtkIPWCallback>::New();
  myCallback->Plane = plane;
  myCallback->Actor = actor;
  myCallback->TextActor = textActor;

Does that help?

David
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