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Re: Paced rotation transform

From: Cameron McCormack <cam@mcc.id.au>
Date: Thu, 23 Oct 2008 12:01:25 +1100
To: public-svg-wg@w3.org
Message-ID: <20081023010125.GI20693@arc.mcc.id.au>

Cameron McCormack:
> New wording that was recently added for paced animation of rotations is:
>   Note, that the formula ensures only a paced animation interpolation,
>   if the rotation center remains unchanged within the animation. Authors
>   may not use paced animation interpolation if the angle is not changed
>   at all to prevent problems for the user agent.
>    — http://dev.w3.org/SVG/profiles/1.2T/publish/animate.html#complexDistances
> It’s not clear to me what that second sentence means.  Should it in fact
> be the opposite (i.e., if the angle is changed at all)?

Er, not the opposite, I misread angle as centre point.  However the
comment below still stands:

> I don’t know
> what sort of problems a user agent may have if an attempt is made to
> perform a paced animation of a rotation that includes a change in centre
> point, since the distance formula is clearly defined.  I suggest that it
> be reworded as:
>   Note that the distance formula for rotation transformations is defined
>   only in terms of the angles and not the center points.  Thus, if paced
>   animation of a rotation transformation that does include a change in
>   center point is performed, the result may not look truly paced.

Cameron McCormack ≝ http://mcc.id.au/
Received on Thursday, 23 October 2008 01:02:03 UTC

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