Re: [cgmo-webcgm] getObjectExtent for text

[Lofton Henderson <lofton@rockynet.com>]

Forrest, All --

Good question.  If you look at p.441 of CGM:1999...

1.) capheight agrees (718)
2.) there are chars with diacritical marks, like A-umlaut.

Therefore #2 implies that Top > Cap.

Does anyone have the answer, what is (and where-to-find) the Top value for 
Helvetica (and the other 12 standard fonts)?

Forrest, what is the difference if you use the Helvetica 'ymax' 
value?  I.e., what does the gOE text expect and what is the ymax-based result?

-Lofton.

p.s. I forgot to include this link earlier:
[1] 
http://www.w3.org/Graphics/WebCGM/drafts/current-editor-21/WebCGM21-DOM.html#getObjectExtent


At 11:17 AM 4/21/2009 -0500, Forrest Carpenter wrote:
>All,
>
>For text the getObjectExtent is based on bottomline-to-topline distance of
>the font. Is there some where this is specified for the standard WebCGM
>fonts? We are using metrics from Microcosm (Tom Wright) for ours. For
>Helvetica we have cap height = 718, ascender = 718 and descender = 207 using
>these values we match Stuart's values for the text string in the
>getObjectExtentTransformed test. In our calculations we use the yMax value
>for the topline calculation which for this font is 931 and gives a different
>value than Stuart's. What values should be used for the topline calculation?
>
>Regards,
>Forrest
>
>
>-----Original Message-----
>From: Galt, Stuart A [mailto:stuart.a.galt@boeing.com]
>Sent: Monday, April 20, 2009 6:07 PM
>To: WebCGM
>Subject: [cgmo-webcgm] getObjectExtent and getObjectExtentTransformed
>
>Hello,
>
>I have updated the getObjectExtent.htm and the
>getObjectExtentTransformed.htm
>files on the FTP server.
>
>For both tests:
>- I have added a try block so if the getObjectExtent() call fails then I
>
>   put "getObjectExtent not implemented" in the result table.
>
>- Changed the calculated box value for the text string to take into
>account
>   the decender of the 'g'
>
>For getObjectExtentTransformed:
>- Changed the how far the circle was translated from 40 to 120.
>
>Stuart.
>
>--
>Stuart Galt
>SGML Resource Group
>stuart.a.galt@boeing.com
>(206) 544-3656
>
>
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