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Re: animations and intervals

From: Sigurd Lerstad <sigler@bredband.no>
Date: Tue, 2 Sep 2003 14:25:28 +0200
Message-ID: <02fc01c3714d$4b605210$6e1273d5@mmstudio>
To: <cogit@ludicrum.org>, <www-svg@w3.org>, <www-smil@w3.org>

Hello,

a long time since I asked this, but I haven't worked on it since so...

I just need a simple clarification.

You are talking about intervals and not the instance time lists? The spec is
pretty clear about how to handle those.

thanks again,

--
Sigurd Lerstad

>
> Hi -
>
> I will jump in since I worked on the SMIL Timing stuff. Yes, you should
keep
> a list of historical intervals until you are reset (assuming you support
> time containment at some point).  Hyperlink navigation is an entirely
valid
> means of interaction and should not be dismissed as "just seeking".  The
> ability to seek backwards can be crucial to authors in some cases, and
this
> is why it was specifically included in SMIL 2 timing. The combination of
> hyperlinking and indeterminate timing (e.g. event based timing) is
somewhat
> complex, but it is consistent. For the SVG 1 case without time containers,
> it is actually fairly simple.
>
> Climbing out on a limb, I will comment that if you are considering not
> keeping the historical intervals, you may be treading close to some more
> serious problems in the implementation. If you are just considering a
minor
> optimization to toss out a few small objects, fine. If you are considering
> departing from the model described in the spec, you are likely headed for
> trouble.
>
> If you have other questions about the SMIL timing model, I would happy to
> help clarify the spec. I know it is not entirely obvious - it is a spec
and
> not a tutorial. In some places, we attempted to clarify precisely what we
> meant, but the detail can be bewildering on the first read.
>
> Good luck with it - Patrick
>
> > -----Original Message-----
> > From: www-smil-request@w3.org [mailto:www-smil-request@w3.org]On Behalf
> > Of Sigurd Lerstad
> > Sent: Tuesday, April 29, 2003 1:14 AM
> > To: www-svg@w3.org; www-smil@w3.org
> > Subject: animations and intervals
> >
> >
> >
> > Hello,
> >
> > Reading up on intervals and current interval etc. in the SMIL
> > timing model.
> >
> > Is it a good idea to keep a history of all the intervals created for an
> > animation element? I'm looking into seeking backwards, and
> > though the rules are not completely clear to me yet, is keeping a list
of
> > already happened intervals a good idea (or even necessery) to
> > seek backwards? It is my understanding that this is not necessary when
> > playing normally and when seeking forwards.
> >
> > As Thomas E Deweese said, it's a good thing to refer to the specs
> > and saying
> > why I think the spec isn't clear when asking a question, however, all
this
> > is very fuzzy at the moment, and I don't have a complete understanding
of
> > the spec yet, I'm simply asking for implementation advise on
> > wether keeping
> > a list of history intervals for the sake of seeking backwards is
> > a good idea
> > or not, a simple yes or no from someone with implementation
> > experience will
> > do, so I know I'm on the right track.
> >
> > thanks,
> >
> > --
> > Sigurd Lerstad
> >
>
>
Received on Tuesday, 2 September 2003 08:23:01 GMT

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