[vtk-developers] 3D widgets
Jeff Lee
jeff at cdnorthamerica.com
Wed Mar 27 13:37:47 EST 2002
Good stuff! But what would it take to be able to call these interactors
from your own event loop? I would like to be able to use vtkInteractors
from java, but because they require a vtkRenderWindowInteractor, I can't
use them. I have had to duplicate functionality just because I am using
a wrapper language. The same goes for tcl/tk and python - most apps
written in wrapper languages have to re-implement interactors. Is there
a clear way to control a vtkRenderWindowInteractor from your own event
loop i.e. just call iren.MousePressed(...), etc...?
-Jeff
Will Schroeder wrote:
> Hi Folks-
>
> There have been some recent changes (by Bill Hoffman) to VTK to enable
> 3D widgets (Command/Observer related changes), and I've added one 3D
> widget (vtkBoxWidget) plus an abstract superclass (vtk3DWidget). A 3D
> widget is something that you can interact with, it has a
> representation in the scene, and it usually provides some information
> that can be used to manipulate other VTK classes. For example, the
> vtkBoxWidget provides a linear transform (which can be used to control
> an actor or transform filter) as well as a vtkPlanes implicit function
> (that can be used for clipping, cutting, etc.).
>
> The changes to Command/Observer allows events to be precessed in
> priority order, as well as the possibility of aborting event
> processing. What this means is that you can combine 3D widgets (as
> many as you want), plus an interactor style (which are now event
> driven) all running simultaneously. In the case of the vtkBoxWidget,
> if you select the widget it handles the event and then does an abort
> (so the interactor does not see it). If you pick outside of the
> widget, then no abort is called so the interactor sees the event and
> does its dance.
>
> There is a simple example: Hybrid/Testing/Tcl/TestBoxWidget.tcl that
> you can play with. I've checked the stuff in to see how it does on the
> dashboard....once I get the defects out I'll try and figure out how to
> test the damn thing and move some code into VTK/Examples as well.
>
> Sebastien asked me if the widget works with the pure Tcl interactors:
> I have no idea. We'll have to look into that.
>
> Comments? Suggestions? before we announce it to the users list?
>
> Will
>
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