Re: AW: [cgmo-webcgm] non-existent ACI font substition issue

[Lofton Henderson <lofton@rockynet.com>]

Reference:
http://www.w3.org/Graphics/WebCGM/drafts/current-editor-21/WebCGM21-Config.html#ACI-deffont

Here it says:

***** begin quote *****
>The defaultFont element specifies, via its useFont attribute, a string 
>defining the font to be used when a requested mapping cannot be accomplished.
>
><!ELEMENT defaultFont EMPTY >
><!ATTLIST defaultFont
>           useFont CDATA #REQUIRED >
>
>Attribute definitions:
>useFont="CDATA"
>The default font to use when the specified font mapping cannot be 
>accomplished. If the font(s) of mapList (substitutionList) are not 
>available, and if defaultFont (useFont) is not available, then the fontMap 
>element has no effect, and any viewer fallback action is viewer dependent. 
>The syntax and normalization rules of useFont are the same as those of the 
>substitutionList attribute, except that useFont shall have exactly one 
>font-family name or generic name in its list.
***** end quote *****

Perhaps I'm misreading this, but it seems to say that: defaultFont 
(useFont) shall be used if none of the fonts in mapList (substitutionList) 
are available; and, if defaultFont (useFont) is not available, then the 
fontMap shall have no effect, etc.

That seems to exactly answer Don's question.

Am I misreading?

Or maybe is that specification unsatisfactory and change is desired?

Regards,
-Lofton.




At 08:18 AM 4/17/2009 +0200, Ulrich Läsche wrote:
>Don,
>
>I would opt for "ignore" since switching to DefaultFont is not what the
>script writer intended.
>
>Regards
>Ulrich
>
>
>-----Ursprüngliche Nachricht-----
>Von: Don [mailto:dlarson@cgmlarson.com]
>Gesendet: Donnerstag, 16. April 2009 21:17
>An: CGM Open WebCGM TC
>Betreff: [cgmo-webcgm] non-existent ACI font substition issue
>
>All
>
>
>There seems to be an issue regarding what the viewer should
>do when when a substitution of a non-existent font occurs in
>an ACI file. For example, the CGM contains a Helvetica font and
>the ACI specifies that "Bogus" is to be substituted for Helvetica
>but "Bogus" font does not exist on the users system.
>
>  <fontMap>
>    <maplist forceSubstitution="yes"
>      cgmFont="Helvetica"
>     substitutionList="Bogus"/>
>  </fontMap>
>
>
>What to do, ignore this substitution or use defaultFont?
>
>
>Regards,
>Don
>Larson Software Technology
>Tel: (713)977.4177 ext. 102
>www.cgmlarson.com
>
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