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Paced rotation transform

From: Cameron McCormack <cam@mcc.id.au>
Date: Thu, 23 Oct 2008 11:57:12 +1100
To: public-svg-wg@w3.org
Message-ID: <20081023005712.GH20693@arc.mcc.id.au>

Hello WG.

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)?  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 00:57:52 GMT

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