[vtkusers] rotating a 2D actor

[Kalpathi Subramanian]

One way to to do this is to make a texture(vtkTexture) out of this image 
and then map it on to vtkPlaneSource (I think thats right, just
use a single quadrilateral). Then that object can be transformed as you 
please.  The texture is input to the actor (there is a actor
method for this)..

I have done this long time back..

    == krs


Pankaj Daga wrote:
> Hi Kalpathi,
>
> Thanks for replying.
>
> Basically, I have a PNG imag that I read using vtkPNGReader and 
> display it using vtkActor2D and vtkImageMapper objects. So, I just 
> wanted to do a simple 2D rotation on it.
>
> Cheers and thanks,
>
> Pankaj
>
> On 10/2/06, *Kalpathi Subramanian* <krs at uncc.edu 
> <mailto:krs at uncc.edu>> wrote:
>
>     Pankaj:
>
>     There is no transformation matrix associated with 2D actors and
>     hence you cannot transform it (like rotate).. if you
>     need to transform your objects use vtkActor.  Tell us what object
>     you need to rotate in your app and we might be
>     able to offer suggestions.  (again, read the vtk doc for vtkAcor2D
>     you will see this in the description).
>
>         == krs
>
>
>     Pankaj Daga wrote:
>>     Hi there,
>>
>>     @Tony: I am a bit confused as to how a vtkCubeAxesActor2D fits into this??? Could you elaborate a bit
>>
>>     Posting my original message again, as the old one is in September thread.
>>
>>     I have a vtkActor2D object that I wish to rotate. Is there a simple way to
>>
>>     rotate it about its center?
>>
>>     I know all vtkProp3D based objects have built in rotation functions. How can
>>
>>     I implement something similar in a vtkActor2D?
>>
>>     Basically, I have a 2D image that I wish to rotate on the screen.
>>
>>
>>     Thanks,
>>
>>     Pankaj
>>     ------------------------------------------------------------------------
>>
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>
>     -- 
>     K.R.Subramanian                        Phone: (704) 687-8579
>     Department of Computer Science         FAX:   (704) 687-3516
>     UNC Charlotte, Woodward 435E           Email: 
>     krs at uncc.edu <mailto:krs at uncc.edu>
>     Charlotte, NC 28223-0001               Web: http://www.cs.uncc.edu/~krs <http://www.cs.uncc.edu/%7Ekrs>  
>         
>
>

-- 
K.R.Subramanian                        Phone: (704) 687-8579
Department of Computer Science         FAX:   (704) 687-3516
UNC Charlotte, Woodward 435E           Email: krs at uncc.edu
Charlotte, NC 28223-0001               Web: http://www.cs.uncc.edu/~krs  

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