[NTG-context] Fwd: Re: Using legacy math fonts

9 Aug 2017

      -------- Forwarded Message --------
Subject: Re: [NTG-context] Using legacy math fonts
Date: Wed, 9 Aug 2017 10:52:34 +0200
From: Hans Hagen 
To: Henri 

On 8/9/2017 7:01 AM, Henri wrote:
...
Furthermore the example only works in TeXlive 2017 but not in beta.  What has changed and how do I
make it work again?
I'm surprised that it worked because we do math deep down in a different 
way than you (probably) assume. Anyway, your definitions are not ok as 
they refer to the wrong family. Also, you need to refer to the lm fonts 
as these are the cm replacements.

% Load CM calligraphic

\font\tensy  =lmsy10 at \mathstyleface\textstyle
\font\sevensy=lmsy7  at \mathstyleface\scriptstyle
\font\fivesy =lmsy5  at \mathstyleface\scriptscriptstyle

% Allocate family

\newfam\cmcalfam

% Assign font families

\textfont        \cmcalfam=\tensy
\scriptfont      \cmcalfam=\sevensy
\scriptscriptfont\cmcalfam=\fivesy

\newtoks\cmcalmathcodes \cmcalmathcodes{%
     \Umathcode`A=\zerocount\cmcalfam`A%
     \Umathcode`B=\zerocount\cmcalfam`B%
     \Umathcode`C=\zerocount\cmcalfam`C%
     \Umathcode`D=\zerocount\cmcalfam`D%
     \Umathcode`E=\zerocount\cmcalfam`E%
     \Umathcode`F=\zerocount\cmcalfam`F%
     \Umathcode`G=\zerocount\cmcalfam`G%
     \Umathcode`H=\zerocount\cmcalfam`H%
     \Umathcode`I=\zerocount\cmcalfam`I%
     \Umathcode`J=\zerocount\cmcalfam`J%
     \Umathcode`K=\zerocount\cmcalfam`K%
     \Umathcode`L=\zerocount\cmcalfam`L%
     \Umathcode`M=\zerocount\cmcalfam`M%
     \Umathcode`N=\zerocount\cmcalfam`N%
     \Umathcode`O=\zerocount\cmcalfam`O%
     \Umathcode`P=\zerocount\cmcalfam`P%
     \Umathcode`Q=\zerocount\cmcalfam`Q%
     \Umathcode`R=\zerocount\cmcalfam`R%
     \Umathcode`S=\zerocount\cmcalfam`S%
     \Umathcode`T=\zerocount\cmcalfam`T%
     \Umathcode`U=\zerocount\cmcalfam`U%
     \Umathcode`V=\zerocount\cmcalfam`V%
     \Umathcode`W=\zerocount\cmcalfam`W%
     \Umathcode`X=\zerocount\cmcalfam`X%
     \Umathcode`Y=\zerocount\cmcalfam`Y%
     \Umathcode`Z=\zerocount\cmcalfam`Z%
}

% Make a macro wrapper

\showglyphs

\unexpanded\def\cmcal#1{{\fam\cmcalfam\the\cmcalmathcodes#1}}

\starttext

     [$\mathcal{TUVA}$]
     [$\cmcal  {TUVA}$]

\stoptext

These old fonts with glyph widths that cheat assume an old math engine 
(with respect to kerning and italics which are fundamentally different 
in opentype math) so there you need to compensate yourself.

It's proabbly easier to use the math font fallback mechanism and map 
that range to some other math font.

Hans
...
On Wed, 2017-08-09 at 17:00 +1200, Henri wrote:
...
Dear list,
Because I don't like that Euler calligraphic script provided by Latin Modern Math, I want to
revert
to Computer Modern for the uppercase calligraphic letters.  I got so far, that the command will
produce the correct glyphs, however, the kerning is borken.  What did I miss?
Cheers, Henri
---
% Allocate tokens for legacy math codes
\newtoks\legacymathcodes\legacymathcodes={
\Umathcode`A="7"1"41 \Umathcode`B="7"1"42 \Umathcode`C="7"1"43
\Umathcode`D="7"1"44 \Umathcode`E="7"1"45 \Umathcode`F="7"1"46
\Umathcode`G="7"1"47 \Umathcode`H="7"1"48 \Umathcode`I="7"1"49
\Umathcode`J="7"1"4A \Umathcode`K="7"1"4B \Umathcode`L="7"1"4C
\Umathcode`M="7"1"4D \Umathcode`N="7"1"4E \Umathcode`O="7"1"4F
\Umathcode`P="7"1"50 \Umathcode`Q="7"1"51 \Umathcode`R="7"1"52
\Umathcode`S="7"1"53 \Umathcode`T="7"1"54 \Umathcode`U="7"1"55
\Umathcode`V="7"1"56 \Umathcode`W="7"1"57 \Umathcode`X="7"1"58
\Umathcode`Y="7"1"59 \Umathcode`Z="7"1"5A
}
% Load CM calligraphic
\font\tensy  =cmsy10 at \mathstyleface\textstyle
\font\sevensy=cmsy7  at \mathstyleface\scriptstyle
\font\fivesy =cmsy5  at \mathstyleface\scriptscriptstyle
% Allocate family
\newfam\cmcalfam
% Assign font families
\textfont        \cmcalfam=\tensy
\scriptfont      \cmcalfam=\sevensy
\scriptscriptfont\cmcalfam=\fivesy
% Make a macro wrapper
\unexpanded\def\cmcal#1{{\fam\cmcalfam\the\legacymathcodes#1}}
\starttext
$\mathcal{TUV}$
$\cmcal{TUV}$
\stoptext
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________
-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------