[vtkusers] rotate 2d image

[m26404030 at john.petra.ac.id]

hi all, i want to ask how to rotate a 2D bmp image(vtkImageData) using  
center of the image as center of the rotation..(i want to save the  
result in another file and display it with vtkImageViewer)
the problem is that i cant do the rotation..

can i use function SetResliceAxesDirectionCosines in the  
vtkImageReslice?? but i dont understand the parameter of the function..

plis help me with this..


Thanx in advance..=p