RE: another clarification needed

[Kevin O'Kane <kevoka@AUTO-TROL.com>]

Yes, this is the behavior we expect.

Kevin

> -----Original Message-----
> From:	Lofton Henderson [SMTP:lofton@rockynet.com]
> Sent:	Wednesday, May 30, 2001 6:03 PM
> To:	cgmopen-members@lists.oasis-open.org
> Subject:	another clarification needed
> 
> CGM Open Members --
> 
> Nothing like writing a test suite to flush out the language of the spec!
> 
> Here is another question.  I hope and expect that the answer to this one
> is 
> non-controversial.  The text of 'grobject' (3.2.1.1), about picking 
> *without* a 'region' APS attribute, says:
> 
> "a click on non-transparent areas of the graphical elements of the object 
> selects the object"
> 
> I believe that our wording is sloppy and we mean this to include the cases
> 
> of filled-area objects with:
> 
> 1. hollow interior style and non-transparent fill color;
> 2. or empty interior style with a non-transparent edge.
> 
> i.e., picking within the interior of a filled-area object with a visible 
> (non-transparent) boundary or edge.
> 
> Example.   b/w drawing with a CGM "circle" element, drawn with default 
> (hollow) interior style and black fill color on a white 
> background.  Picking on the interior would select the object?  I think the
> 
> answer is "yes".  If the answer is "no", then one could achieve the result
> 
> by setting interior style to solid, white.  It would look identical 
> (assuming that nothing had been drawn behind).
> 
> I seem to remember discussion of this in the past.  If the answer is "no",
> 
> then we start to get onto a slippery slope about things that are visible, 
> things that are transparent, things that are "camouflaged" (solid but in 
> background color), and things like the above that are part visible, part 
> transparent or camouflaged.  (And everyone's "pick" algorithms get very 
> cumbersome.)
> 
> Does everyone agree that the answer is: "yes", a hollow or empty 
> filled-area object with visible boundary or edge is picked by clicking in 
> the interior?
> 
> Regards,
> -Lofton.
> 
> p.s.  I do recall, that we do *not* want it to include the cases of line 
> primitives which happen to form something that looks like a polygonal or 
> solid object.  I.e., if it is line primitives, and not within a Closed 
> Figure, then you must pick on the lines.
> 
> *******************
> Lofton Henderson
> 1919 Fourteenth St., #604
> Boulder, CO   80302
> 
> Phone:  303-449-8728
> Email:  lofton@rockynet.com
> *******************
> 
> 
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