[vtkusers] Put labels onto image

[Wayne Christopher]

You should be able to change the position of the actor (as opposed to 
the attachment point) to move the relative caption position.  See 
http://www.vtk.org/doc/nightly/html/classvtkCaptionActor2D.html#_details

     Wayne

On 8/26/11 6:46 AM, Xiaopeng Yang wrote:
>
> Thank you very much. One more question, I tried to put 2 captions onto 
> the sphere. So I used two caption widgets. However, the two captions 
> are overlapped at the left bottom corner. How to assign different 
> location for different caption?
>
> Best,
>
> Xiaopeng
>
> *From:*Dz(enan Zukic' [mailto:dzenanz at gmail.com]
> *Sent:* Friday, August 26, 2011 10:28 PM
> *To:* Xiaopeng Yang
> *Cc:* David Doria; vtkusers at vtk.org
> *Subject:* Re: [vtkusers] Put labels onto image
>
> You can group it into a vtkAssembly together with the sphere, and then 
> rotate that assembly.
>
> On Fri, Aug 26, 2011 at 15:14, Xiaopeng Yang <yxp233 at postech.ac.kr 
> <mailto:yxp233 at postech.ac.kr>> wrote:
>
> David,
>
> The second example is what I want since I need to assign the caption 
> to certain point in a 3D object. However, in the example, the caption 
> itself does not move when I rotate the sphere. My question is how to 
> make it move along with the 3D object during rotation.
>
> Thank you so much.
>
> Xiaopeng
>
> *From:*David Doria [mailto:daviddoria at gmail.com 
> <mailto:daviddoria at gmail.com>]
> *Sent:* Friday, August 26, 2011 8:33 PM
> *To:* Xiaopeng Yang
> *Cc:* vtkusers at vtk.org <mailto:vtkusers at vtk.org>
>
>
> *Subject:* Re: [vtkusers] Put labels onto image
>
> On Fri, Aug 26, 2011 at 3:43 AM, Xiaopeng Yang <yxp233 at postech.ac.kr 
> <mailto:yxp233 at postech.ac.kr>> wrote:
>
> Hi Wayne,
>
> It works good. Thank you. However, when I rotate the 3D object, the 
> caption which associated with a point on the 3D object should be 
> covered (invisible) when that point is rotated to the backside 
> (invisible). But is always visible and appear on the object, which can 
> mislead the user  to know the position of the caption.
>
> Do you have any good idea to avoid this happening?
>
> Thanks,
>
> Xiaopeng
>
> CaptionActor2D is great for 2D, but for 3D I think you'll want:
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Follower
>
> or
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/Caption
>
> David
>
>
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