[Insight-developers] itkIndex & itkOffset

[Joshua Cates]

That certainly works for me.  I think there are definite advantages to
having a signed index.

Josh.

______________________________
 Josh Cates			
 School of Computer Science	
 University of Utah
 Email: cates@cs.utah.edu
 Phone: (801) 587-7697
 URL:   www.cs.utk.edu/~cates


On Tue, 3 Apr 2001, Stephen R. Aylward wrote:

> Again - how about changing itkIndex back to signed?
> 
> Isn't that what we decided before?
> 
> s
> 
> Joshua Cates wrote:
> > 
> > Hello all,
> > 
> > Now that itkIndex has been changed to unsigned and there is a
> > signed itkOffset class, we need to establish the definitions
> > and relationship between the two classes in very concrete terms.
> > 
> > The documentation for itkOffset defines it as the difference between two
> > itkIndex's, but the implementation of itkIndex does not support this
> > definition. Currently all arithmetic operations between two itkIndex
> > return itkIndex. This is no longer appropriate.
> > 
> > If itkOffset is the difference btwn two itkIndex it follows that:
> > 
> >  itkIndex - itkIndex  = itkOffset
> >  itkIndex - itkOffset = itkIndex
> >  itkIndex + itkOffset = itkIndex
> >  itkIndex + itkIndex  = itkOffset? itkIndex? or undefined?
> > 
> > Another issue is whether to check the itkIndex - itkOffset case for
> > negative results, which will produce undefined values in itkIndex.
> > What do others think?
> > 
> > Josh.
> > 
> > ______________________________
> >  Josh Cates
> >  School of Computer Science
> >  University of Utah
> >  Email: cates@cs.utah.edu
> >  Phone: (801) 587-7697
> >  URL:   www.cs.utk.edu/~cates
> > 
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> 
> -- 
> ===============================================
> Stephen R. Aylward
> Assistant Professor of Radiology
> Adjunct Assistant Professor of Computer Science
> http://www.cs.unc.edu/~aylward
> aylward@unc.edu
> (919) 966-9695
>