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Fwd: Re: [cgmo-webcgm] font metrics

From: Lofton Henderson <lofton@rockynet.com>
Date: Mon, 27 Apr 2009 17:01:35 -0600
Message-Id: <>
To: WebCGM WG <public-webcgm-wg@w3.org>
Cc: Forrest Carpenter <forrest@sdicgm.com>, Robert Orosz <roboro@auto-trol.com>,Ulrich Läsche <ulrich@cgmtech.de>
Forrest has finished his action item to illustrate the font metrics:
[1] http://lists.oasis-open.org/archives/cgmo-webcgm/200904/msg00131.html

Have a look at the great picture that he generated.

This should allow the dependent tests [gOE and gOET] to go forward.

For the spec, our question is:  what changes, if any, should go into the 
WebCGM spec to clarify this for future implementors?

1.) none -- the existence of "FontBBox -166 -225 1000 931" in the AFM data 
(Helvetica in this example) should be sufficient.
2.) normatively add to WebCGM spec the information from the AFM for the 
core-13 fonts of WebCGM.
3.) in the WebCGM spec, informatively explain or add or point to the 
information from the AFM.
4.) other?

We will discuss on Tuesday.

Note that options #2 and #3 don't answer the question for any font outside 
of the core-13, which can be any font that has an associated FONT 
PROPERTIES element.  (My opinion:  those generator/viewers need to figure 
out and understand what is 'bottom' and what is 'top' for the "odd" fonts, 
just as we have figured it out for core-13).


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>Forrest -- that's great!  I think your results unambiguously answer that 
>AFM ymin is CGM:1999 'bottom' and AFM ymax is CGM:1999 'top', for all 
>Stuart -- you should be able to check/update your tests to ensure that 
>you're using the right numbers for 'bottom' and 'top'.
>All -- we will discuss on the Tuesday vF2F agenda, what (if anything) to 
>do about this in the WebCGM specification.  (Which has normative reference 
>indirectly to other bits of the AFM via CGM:1999 annex I.)
>At 01:56 PM 4/27/2009 -0500, Forrest Carpenter wrote:
>>Attached are the adobe AFM file, a png image and a CGM file showing 
>>characters drawn with a cap height of 71.8 mm. The characters included 
>>are the A-ring which shows the max y of 931 and the C-cedilla which has 
>>the min y of -225. The image was generated on UNIX using the Microcosm 
>>font for Helvetica which is visually and metrically equivalent to the 
>>Adobe font. When drawn on Windows mapping Helvetica to Arial we get 
>>different results.
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Received on Monday, 27 April 2009 23:02:47 UTC

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