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Re: SVGAnimationElement.getStartTime

From: Cameron McCormack <cam@mcc.id.au>
Date: Thu, 29 Jan 2009 17:00:07 +1100
To: www-svg@w3.org
Cc: birtles@gmail.com
Message-ID: <20090129060007.GB4140@arc.mcc.id.au>

Hi Brian.

Brian Birtles:
> I would like to revisit the specification of
> SVGAnimationElement.getStartTime. As noted by Cameron McCormack in January
> 2006[1] the SVG 1.1 specification simply states that this method:
> 
>   Returns the start time in seconds for this animation.[2]
> 
> However, it does not specify which start time in the case of multiple start
> times. Is it the start time of the current active interval? And if there is
> no current active interval is it the start time of the next interval or the
> previous interval?
> 
> I have produced a small test of this behaviour[3] and note that Opera 9.62
> appears to return the start time of the current interval, or failing that
> the start time of the next interval, or failing that the start time of the
> previous interval.
> 
> I think it is necessary to define this behaviour more adequately.
> Unfortunately Cameron McCormack's previous query went unanswered. Is it
> possible to add an erratum specifying this behaviour?

The Working Group discussed this and settled on the method returning the
begin time of the current interval, where “current interval” is defined by
SMIL to be the active interval, if one exists, otherwise the next
interval that will begin, if such an interval is known.  If called when
there is no current interval, then an INVALID_STATE_ERR DOMException is
thrown.

The erratum is here:

  http://dev.w3.org/SVG/profiles/1.1F2/errata/errata.xml#getStartTime-return-value

and will be published to the official SVG 1.1 errata page soon.  The
link to the test case is broken, but the test is at:

  http://dev.w3.org/SVG/profiles/1.1F2/test/svg/animate-dom-01-f.svg

though note that it hasn’t been reviewed yet.

Thanks,

Cameron
(ISSUE-2201)

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Thursday, 29 January 2009 06:00:52 GMT

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