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Re: animateTransform type="matrix"

From: Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>
Date: Thu, 1 Nov 2007 12:11:09 +0200
To: www-svg@w3.org
Message-Id: <200711011111.10161.Dr.O.Hoffmann@gmx.de>

> the current Opera nightlies animate the attachment, though this is  
> stated to be a regression. 
>What is the reason the WG chose not to support the matrix value?
>it's not immediately clear to me how else this behaviour might be  

Surprise, surprise! 
However this is a very useful improvement, but should not happen for
a defined version like 1.0, 1.1 or tiny 1.2 ;o)
I already did some simulations using an animation of xlink:href to
simulate a frame-based animation and there is no technical
problem to animate matrix. The 'frame-based' method only blows
up the source code with superfluous constructions.
Maybe it is only excluded in the recommendations for historical 
reasons? Maybe the idea was, that it is a too complex construction
to be animated? (just guessing)
Of course especially in the filter chapter there are more complex
attribute constructions animatable as the type matrix of transform.
Maybe the matrix type should be animatable in SVG 1.2 full?
I would like to use it.
Something has to be fixed before - there are several problems
with implementations of animations only using the 'to' attribute
and a minor with 'by' and some general inconsistencies with
additive animations for animateTransform in general. But 
if this is clarified or aligned to a useful behaviour, there is
no really problem left with the type matrix, I can see.

Because authors are not allowed to animate matrix in the
current profiles, it is not really a problem, if it is possible with
Opera anyway, because in a correct document this will never
appear and there is no chance for Opera to animate this because
it simply does not exist in a correct document ;o)
And why to be fussy with the interpretation of faulty documents? ;o)
Received on Thursday, 1 November 2007 10:17:53 UTC

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