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SVG1.1 TestSuite 2006-12-13 animate-elem-62-t wallclock test

From: Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>
Date: Wed, 10 Jan 2007 14:43:06 +0100
To: www-svg@w3.org
Message-Id: <200701101443.06650.Dr.O.Hoffmann@gmx.de>

Hello,

If I understand SMIL correct, description and (at present) PNG of
the subtest for wallclock in animate-elem-62-t seems to be wrong.

For this:
"
<rect x="-6" y="-6" width="12" height="12" fill="#F33">
  <set attributeName="fill" to="#3F3" end="wallclock(2200-06-10T12:34:56Z)" 
dur="indefinite"/>
</rect>
"

it is explained:
"
The eight's <set> target has its end attribute set to 'wallclock()'. 
Therefore, the target should never turn green because the target wallclock 
time is in the very distant future, so the animation should not end (unless 
this test is used for close to two hundred years, in which case the end date 
should be updated for an additional two or three hundred years).
"

I think, correct would be something like (and in the PNG the rectangle has 
to be green for the next years):
"
The eight's <set> target has its end attribute set to 'wallclock()'. 
The result depends on the presentation time. 
If the document is viewed completely before 2200-06-10T12:34:56Z,
the rectangle has to be always green. begin is not explicitely set, therefore 
it is zero, dur is indefinite and end is in the future.
If the document is viewed completely after 2200-06-10T12:34:56Z, the only end 
value is before the implicitely given only begin value and therefore the set
does not start, the rectangle remains red.
If the document is viewed in a time interval started before 
2200-06-10T12:34:56Z and ended after this date,
the rectangle will start green at the beginning, change to red at 
2200-06-10T12:34:56Z and will remain red until the end of presentation.
"

See (3.2.1) 
http://www.w3.org/TR/2001/REC-smil-animation-20010904/#AnimFuncTiming

Because wallclock values are converted into document time, a wallclock value
in the future is the same as a positive offset for end. 
The viewer has just to determine the offset at the begin of the presentation, 
and can replace the wallclock value for end with this offset.


The description of the first subtest has a minor problem too:
"
The first <set> has an unspecified end attribute. That value defaults to an 
offset of 0s so the animation should apply as soon as the document is loaded.
"

If end is not explicitely given, the default is not 0s or something else. 
A default value for unspecified end may cause problems or another behaviour 
as specified in SMIL in more complicated situations. 

Happy testing...
Received on Wednesday, 10 January 2007 15:09:15 GMT

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