[vtkusers] circle

[Renaud Isabelle]

Hi,
 
Thanks guys for all your answers. 
 
I tried vtkDisksource and I think this is the best and easiest way to do it.
 
Isabelle


David.Pont at ensisjv.com a écrit :

Renaud Isabelle wrote on 17/08/2005 08:22:43:

> Hi,
>
> I would like to draw a circle each time and where exactly the user
> clicks on my displayed image.
>
> I saw examples to draw a sphere:
>
> vtkSphereSource* m_sphere = vtkSphereSource::New();
> vtkActor* m_sphereActor = vtkActor::New();
> vtkPolyDataMapper* sphereMapper = vtkPolyDataMapper::New();
> sphereMapper->SetInput(m_sphere->GetOutput());
> m_sphereActor->SetMapper(sphereMapper);
> m_Renderer->AddActor( m_sphereActor );
>
> But is there a way to draw a circle (that is empty disk and in 2D)
> instead of a filled sphere in 3D? Maybe vtkSphereSource added to
vtkActor2D
> could be a way?
>
> I am not familiar with VTK for the moment, so, please, excuse me if
> this seems obvious....

You could try:
vtkCutter with vtkPlane and your vtkSphereSource
vtkDiskSource
vtkTexture loaded with an image of a circle on a transparent (alpha=0)
background and placed on a vtkPlaneSource
vtkImageViewer (never used this but worth a look I think...) with an
image of a circle...

Dave P

>
> Isabelle
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