[vtkusers] vtkSphereHandleRepresentation problem

[Karthik Krishnan]

On Tue, Apr 15, 2008 at 7:38 AM, Greg Ushomirsky <gregus at gmail.com> wrote:
> Hi,
>
>  I'm having a problem using vtkSphereHandleRepresentation class. I have
>  a simple program that places the widget at the location of an existing
>  actor. When I press "i", I expect to see the sphere and be able to
>  move it.. However, what happens is (1)  I don't see the sphere widget
>  (2)  the cursor changes into a hand the first time around, but, after
>  I click on the middle of the actor (where the sphere handle should
>  be), the cursor changes back into an arrow. After that, no matter how
>  many times I press "i", it looks like the interaction doesn't start
>  again.   What am I doing wrong??

Nice catch.

There was indeed a bug in vtkSphereHandleRepresentation. Sorry about
that. I should've added a test when I committed the class.

The prop was getting culled away due to a bug in reporting the bounds
for the prop. This was just fixed CVS..
A test exercising it has also been added:
Testing/Cxx/Widgets/TestSphereHandleWidget.cxx

http://public.kitware.com/cgi-bin/viewcvs.cgi/Widgets/vtkSphereHandleRepresentation.cxx?sortby=date&view=log
http://public.kitware.com/cgi-bin/viewcvs.cgi/Widgets/vtkSphereHandleRepresentation.h?sortby=date&view=log
http://public.kitware.com/cgi-bin/viewcvs.cgi/Widgets/Testing/Cxx/TestSphereHandleWidget.cxx?sortby=date&view=log

-----

As you've figured out by now, I've added a
vtkPolygonalHandleRepresentation3D class that can represent arbitrary
polygonal shapes
as handles.

Setting the handle source to be the output of a vtkSphereSource
results in the same behaviour as using a
vtkSphereHandleRepresentation.

In addition the class "vtkPolygonalHandleRepresentation3D" is
integrated into the
PointPlacer framework in VTK, thereby allowing you to place contraints
on the placement of the handles. See the test:
TestPolygonalRepresentationHandleWidget.cxx which constrains the
handle placement on the surface of the terrain.


Thanks
--
karthik

>
>  Below is an excerpt from the program I use. Note that if I create a
>  vtkPointHandleRepresentation instead of a
>  vtkSphereHandleRepresentation, or even if I make a
>  vtkPolygonalHandleRepresentation and feed it a sphere source, the
>  interaction proceeds as it should, or at least the widget is visible.
>  This leads me to believe that there may be a problem with
>  vtkSphereHandleRepresentation.
>
>  Also, it would be helpful to have either an example of the class being
>  used, or at least a regression test that can be used as a basis for
>  new code. Do these exist??
>
>  Thanks in advance,
>  Greg
>
>  =======code===============
>  #include "vtkCamera.h"
>  #include "vtkRenderWindow.h"
>  #include "vtkRenderWindowInteractor.h"
>  #include "vtkPolyData.h"
>  #include "vtkPointSource.h"
>  #include "vtkRenderer.h"
>  #include "vtkActor.h"
>  #include "vtkProperty.h"
>  #include "vtkSmartPointer.h"
>  #include "vtkPolyDataMapper.h"
>  #include "vtkParticleReader.h"
>  #include "vtkCylinderSource.h"
>  #include "vtkPointHandleRepresentation3D.h"
>  #include "vtkSphereHandleRepresentation.h"
>  #include "vtkPolygonalHandleRepresentation3D.h"
>  #include "vtkHandleWidget.h"
>  #include "vtkIndent.h"
>
>  int main( int argc, char *argv[] )
>  {
>         vtkSmartPointer<vtkRenderer> ren                                = vtkRenderer::New();
>         vtkSmartPointer<vtkRenderWindow> renWin                 = vtkRenderWindow::New();
>         renWin->AddRenderer(ren);
>
>         vtkSmartPointer<vtkRenderWindowInteractor> iren =
>  vtkRenderWindowInteractor::New();
>         iren->SetRenderWindow(renWin);
>
>         vtkSmartPointer<vtkCylinderSource> src          = vtkCylinderSource::New();
>         vtkSmartPointer<vtkPolyDataMapper> mapper               = vtkPolyDataMapper::New();
>         mapper->SetInputConnection(src->GetOutputPort());
>
>         vtkSmartPointer<vtkActor> actor                                 = vtkActor::New();
>         actor->SetMapper(mapper);
>
>         ren->AddActor(actor);
>
>         //THIS WIDGET DOES NOT WORK
>         vtkSmartPointer<vtkSphereHandleRepresentation> handleRep =
>  vtkSphereHandleRepresentation::New();
>
>         //BUT THIS ONE SEEMS TO WORK JUST FINE
>         //vtkSmartPointer<vtkPointHandleRepresentation3D> handleRep =
>  vtkPointHandleRepresentation3D::New();
>
>         //OR EVEN THIS ONE
>         //vtkSmartPointer<vtkPolygonalHandleRepresentation3D> handleRep =
>  vtkPolygonalHandleRepresentation3D::New();
>         //vtkSmartPointer<vtkSphereSource> sph = vtkSphereSource::New();
>         //sph->SetThetaResolution(16);   sph->SetPhiResolution(8); sph->SetRadius(0.1);
>         //handleRep->SetHandle(sph->GetOutput());
>
>
>         handleRep->PlaceWidget(actor->GetBounds());
>         vtkHandleWidget *handleWidget = vtkHandleWidget::New();
>         handleWidget->SetInteractor(iren);
>         handleWidget->SetRepresentation(handleRep);
>
>
>         ren->SetBackground(0,0,0);
>         iren->Initialize();
>
>         renWin->Render();
>
>         iren->Start();
>
>         return 0;
>  }
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