[vtkusers] How to move points interactively, vtkHandleWidget

[Dirk Fressmann]

Got it! Thank you very much! That was a big help and spared a lot of time!


Karthik Krishnan wrote:
> You can get it from the representation...
> as in    widgetRep->GetWorldPosition( pos );
> 
> Dirk Fressmann wrote:
>>
>> Oh thanks that helped :-) I figured out how to use it and got the 
>> sphere on the screen. But how do I get the new position (after 
>> translation) in world coordinates?
>>
>> Thanks in advance
>> Cheers Dirk
>>
>>
>>
>> Karthik Krishnan wrote:
>>> On Fri, Oct 17, 2008 at 10:24 AM, Dirk Fressmann
>>> <dirk.fressmann at dynamore.de> wrote:
>>>> Hey Guys,
>>>>
>>>> I have a vtkUnstructuredGrid defined and want to be able to mousepick
>>>> certain nodes to move them in space. I found two possibilities:
>>>> - vtkPointWidget
>>>> - vtkHandleWidget/vtkPointHandleRepresentation3D or
>>>> vtkSphererHandleRepresentation.
>>>>
>>>> Especially since I want to highlight those points, which can be 
>>>> moved by the
>>>> user, I think the latter one is the best method. Unfortunately I 
>>>> can't find
>>>> any information or examples about this
>>>
>>> Did you take a look at the VTKTests.
>>>
>>> Specifically the following two tests are the examples you are
>>> looking for:
>>>
>>>   TestSphereHandleWidget.cxx
>>>   TestHandleWidget.cxx
>>>
>>>
>>>> and I don't see any effects if I do
>>>> something like this (python)
>>>>
>>>> vtkHandleRepr = vtk.vtkSphereHandleRepresentation()
>>>> vtkHandleRepr.SetWorldPosition([0.0,0.0,0.0])
>>>> vtkHandleRepr.SetHandleSize(5.0)
>>>> vtkHandleRepr.SetSphereRadius(5)
>>>> vtkHandleRepr.ActiveRepresentationOn()
>>>> vtkHandleRepr.SetRenderer(ren)
>>>>
>>>> vtkHandle = vtk.vtkHandleWidget()
>>>> vtkHandle.SetRepresentation(vtkHandleRepr)
>>>> vtkHandle.SetInteractor(iren)
>>>>
>>>> # callback function
>>>> def _testit(object,event):
>>>>    print "hello"
>>>> vtkHandle.AddObserver("LeftButtonPressEvent", _testit)
>>>>
>>>> or c++
>>>>
>>>>  vtkSphereHandleRepresentation *handleRep =
>>>>    vtkSphereHandleRepresentation::New();
>>>>  double pos[3] = {0.0, 0.0, 0.0};
>>>>  handleRep->SetWorldPosition(pos);
>>>>  handleRep->SetPlaceFactor(2.5);
>>>>  handleRep->SetSphereRadius(5.0);
>>>>  handleRep->PlaceWidget(vtkActor[1]->GetBounds());
>>>>  handleRep->ActiveRepresentationOn();
>>>>
>>>>  vtkHandleWidget *handleWidget = vtkHandleWidget::New();
>>>>  handleWidget->SetInteractor(iren);
>>>>  handleWidget->SetRepresentation(handleRep);
>>>>
>>>> where there should be at least a sphere at position (0,0,0).
>>>> Anyone any ideas or experiences with this?
>>>>
>>>> Cheers Dirk
>>>> _______________________________________________
>>>> This is the private VTK discussion list.
>>>> Please keep messages on-topic. Check the FAQ at:
>>>> http://www.vtk.org/Wiki/VTK_FAQ
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>>
>>>
>>>
>>>
>>
> 

-- 
DYNAmore - Gesellschaft fuer Ingenieurdienstleistungen mbH
Dirk Fressmann, Dr.-Ing.
Industriestrasse 2
D-70565 Stuttgart-Vaihingen
--------------------------------------------------------------------
Tel             +49 (0)711 - 45 96 00 - 23
Fax             +49 (0)711 - 45 96 00 - 29
E-Mail          dirk.fressmann at dynamore.de
Internet        www.dynamore.de