re: [cgmo-webcgm] Proposal for getObjectExtent with no graphical primitives.

[Don <dlarson@cgmlarson.com>]

Stuart Returning
 an exception seems to strong an action.  Returning
values like "0,0,-1,-1" which is often used to indicate a null rectangle.

But What's wrong with the way it's specified now, i.e. return an "empty 
string".


Don

 >  From the minutes:
 >  Question: How do we handle a getObjectExtent call to an APS that has no
 >  graphical primitives?
 >  Add an exception to the exception list? Should we consider another
 >  approach?
 >  JavaScript has a concept of undefined? This may be the right approach.
 >  Dave and
 >  Stuart will look at the options: 1) throw an exception, 2) add a 5th
 >  parameter to include a
 >  result, or 3) invent something invalid for the 4 floats.

 >  I would propose that we return the rectangle such that it is not
 >  expressed as lower
 >  left followed by the upper right point.  Then if the script author was
 >  worried
 >  about the potential for objects with no graphical primitives they could
 >  simply 
 >  take the results x0, y0, x1, y1 and check if x1 < x0

 >  Stuart.

 >  --
 >  Stuart Galt
 >  SGML Resource Group
 >  stuart.a.galt@boeing.com
 >  (206) 544-3656


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