Re: More on getObjectExtent()

I would agree with dropping "abstract".  Locus is a perfectly valid term to
define the path of the primitive.

Probably ought to capture it somewhere to document the decision.

Dave

On Wed, Nov 19, 2008 at 8:04 AM, Lofton Henderson <lofton@rockynet.com>wrote:

> At 09:26 AM 11/19/2008 -0500, Bezaire, Benoit wrote:
>
> I think the wording should be revised.
>
>
> Fair enough.
>
> Even Google doesn't come up with anything meaning full for "Abstract
> locus".
>
>
> However, it does give lots of hits for a search like "definition of
> mathematical locus".  And we use "locus" repeatedly, in the proper sense, in
> the profile (Ch.6) -- i.e., "locus" is a pretty common term in  and has been
> used in WebCGM, for example, since 1999.  So it is my hastily-invented
> modifier "abstract" that is problematic.
>
> Actually, I think a good solution would be to drop the word "abstract".
> The next sentence after its occurrence fully explains what "abstract" was
> meant to convey.  (And we have agreed to clarify that sentence.)
>
> (See the getObjectExtent definition in 5.7.6:
> http://docs.oasis-open.org/webcgm/v2.1/cs01/WebCGM21-DOM.html#L5095 .)
>
> Okay?
>
> (Shall I just add this to fix to the clarification in DoC #3:
> http://www.w3.org/Graphics/WebCGM/WG/2008/WebCGM21-LC-comments.html#Issue3
> ?)
>
> -Lofton.
>
>
> ------------------------------
> *From:* Lofton Henderson [mailto:lofton@rockynet.com <lofton@rockynet.com>]
>
> *Sent:* Tuesday, November 18, 2008 6:52 PM
> *To:* Bezaire, Benoit; WebCGM WG
> *Subject:* Re: More on getObjectExtent()
>
> At 01:52 PM 11/18/2008 -0500, Bezaire, Benoit wrote:
>
> The wording says "[...] The bounding box calculation is based on the
> abstract locus of the primitives within the APS."
> What does 'abstract locus' mean?
>
>
> The locus is the set of points comprising the drawn primitive (it's a term
> I dredged up from my memory of some old math courses -- I hope I got it
> right).  "Abstract locus" means that things like line width are not
> included, but rather only the point positions as if the item were drawn with
> an abstract, infinitely fine pen.
>
>
> I'd like to know if getObjectExtent() returns a tight bounding box on a
> given APS. i.e., given a polybezier, are control points part of the bounding
> box calculations or not?
>
>
> No.  The control points are part of the defining data, but not part of the
> drawn primitive.
>
> -Lofton.
>
>