W3C home > Mailing lists > Public > www-svg@w3.org > September 2008

Re: [1.2T-LC] inverse and constrained transformations

From: David Woolley <forums@david-woolley.me.uk>
Date: Sun, 28 Sep 2008 18:40:45 +0100
Message-ID: <48DFC19D.7050004@david-woolley.me.uk>
To: www-svg@w3.org

Dr. Olaf Hoffmann wrote:
> David Woolley:
>> Can you provide a concrete example.  I would have thought that, if the 
>> inverse didn't exist, there will always be points that don't have a 
>> unique image when the transform is reversed.
> If the determinant of the transformation matrix is zero, 
> 2-dimensional and 1-dimensional structures are mapped
> to 1-dimensional structures or points. Just looking at the
> result, it is not possible to reverse such transformation,
> it is not a bijective function, just surjective.

That was my point.  There is no way of inverting the transform, even if 
one works with the individual steps, not just the matrix.

David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
Received on Sunday, 28 September 2008 17:41:33 UTC

This archive was generated by hypermail 2.3.1 : Wednesday, 8 March 2017 09:47:15 UTC