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Re: transform animation and decomposition

From: Doug Schepers <schepers@w3.org>
Date: Wed, 25 Mar 2009 22:36:26 -0400
Message-ID: <49CAEA2A.1070509@w3.org>
To: Dean Jackson <dino@apple.com>
CC: SVG WG <public-svg-wg@w3.org>
Hi, Dean-

Dean Jackson wrote (on 3/25/09 5:52 PM):
> (see the following message for a real world example)
> I wonder if this decomposition should be added to SVG animation as well.
> It will "break" existing content, but only in a way that makes things
> better in the majority of cases. And I doubt there is much content out
> there that is animating matrices.

Sorry to be a bit dense... Could you clarify what you mean by "breaking" 
existing content?

Is the problem that Dr. Olaf points out that there is mismatch between a 
matrix animation and the corresponding animation if decomposed into, 
say, a translate, rotate, and scale?

If so, I do understand his concern, but I would also agree with you (if 
I understand you correctly) that this allows an author to achieve 
different effects by using different methods of animation, which may be 
more desirable than pure mathematical consistency.  If this doesn't 
prevent authors from achieving their goals in one manner or another 
(though it may have occasional surprising behavior), then I am not 
particularly bothered.

I appreciate your posting the example... it might be useful and 
compelling if you could put together some actual running code to 
illustrate the various differences (preferably something that could be 
used as a test or as a tutorial later).

-Doug Schepers
W3C Team Contact, SVG and WebApps WGs
Received on Thursday, 26 March 2009 02:36:39 UTC

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