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Re: Inheritance during SVG Animation of CSS properties -- should "base value" incorporate ancestors' animation effects?

From: Chris Lilley <chris@w3.org>
Date: Wed, 9 Jun 2010 14:11:20 +0200
Message-ID: <1409550814.20100609141120@w3.org>
To: "Erik Dahlstrom" <ed@opera.com>
CC: www-svg@w3.org
On Wednesday, June 9, 2010, 10:07:36 AM, Erik wrote:

ED> On Wed, 09 Jun 2010 02:38:35 +0200, Daniel Holbert <dholbert@mozilla.com>
ED> wrote:

ED> ...
>>   MY QUESTION: What should be used as the "base value" for this  
>> animation on the child node?  The actual underlying value is "inherit",  
>> but what should that evaluate to, when we place it at the base of the  
>> animation sandwich to compose the child's "by-animation"?  Should we use  
>> the parent's animated value, or the parent's underlying non-animated  
>> value?
ED> ...
>> This problem is (slightly) more general than this, though -- in  
>> particular, we hit the same basic question with the "currentColor"  
>> value, with no inheritance at all.  The situation for this is as  
>> follows: if we animate the "color" attribute on an element that has e.g.  
>> style="fill: currentColor", and then we begin a "by" animation on the  
>> "fill" property, should the "color" animation feed into the base value  
>> of the "fill" animation?  (I'd say "yes".)

ED> That sounds quite similar to this testcase:

ED>    http://dev.w3.org/SVG/profiles/1.1F2/test/svg/animate-elem-85-t.svg


Its also similar to animate-elem-41-t.svg
http://dev.w3.org/SVG/profiles/1.1F2/test/harness/htmlEmbed/animate-elem-41-t.html
and animate-elem-78-t.svg (which uses set)
http://dev.w3.org/SVG/profiles/1.1F2/test/harness/htmlEmbed/animate-elem-78-t.html

both of these test inheritance of animated values. currentColor is included in the tests.

Another test specific to currentColor and inherit is 
animate-elem-84-t.svg
http://dev.w3.org/SVG/profiles/1.1F2/test/harness/htmlEmbed/animate-elem-84-t.html



-- 
 Chris Lilley                    mailto:chris@w3.org
 Technical Director, Interaction Domain
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG
Received on Wednesday, 9 June 2010 12:12:12 GMT

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