Re: Using stylistic sets in math

[Khaled Hosny <khaledhosny@eglug.org>]

On Thu, Jul 15, 2010 at 09:45:57PM +0200, Hans Hagen wrote:
> On 15-7-2010 9:24, Khaled Hosny wrote:
> >In XITS I have stylistic sets (ss01-07) for accessing additional
> >alphabets not bresent in Unicode, or variants of exising ones.
> >
> >For example, ss01 maps the script alphabets to an alternate calligraphic
> >one, so I did:
> >
> >\starttext
> >\setupbodyfont[xits]
> >\ctxlua{fonts.otf.features.register_base_substitution('ss01')}
> >\definefontfeature[ss01][mode=base,script=math,ss01=yes]
> >$\addff{ss01}\cal ABCDEFG$
> >\stoptext
> >
> >(I was not expecting \addff to work in math, but anyway).
> >
> >This works, however, but I don't want to set the feature globally:
> >
> >\starttext
> >\ctxlua{fonts.otf.features.register_base_substitution('ss01')}
> >\definefontfeature[math-text][mode=base,script=math,ss01=yes]
> >\setupbodyfont[xits]
> >$\cal ABCDEF$
> >\stoptext
> 
> math currently operates in base mode; what i can do is map it onto
> some private range; as the number of math fonts is small it's no big
> deal to keep either a list of features that provide this; we'd best
> cook up such a list in small committee
> 
> also, context does math different than e.g. latex so having the
> glyphs in some well defined spot helps macro packages
> 
> actually, since there are probably more symbols not in unicode, i
> think that we need to define some extensions ourselves in the
> private use area.

I'm not a big fan of private use area myself, it just makes things more
unportable. The approach I used is mapping the new characters to the
closest matching existing ones, so calligraphic is mapped to script,
sans serif Greek is mapped to serif and so on. What I want is a way to
use different font for specific parts in the equation, for example a
\mathaltcal or \mathsfbfgreek etc that could have a different feature
than the main math font.

Regards,
 Khaled

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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