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I would like to use e.g. the calligraphic font from two different fonts conveniently in the same document.

For example in the snippet below, how can I load in parallel e.g. the calligraphic fonts from LatinModern and use it via a command like \symcallatin{ABC}?

I have already found some solutions that rely on switching the whole font e.g. using mathversion. But I would like to avoid this and instead have a dedicated command that allows to write certain symbols in a predefined font. How can this be achieved?

% !TeX TS-program = lualatex
\documentclass{standalone}
\usepackage{fontspec,unicode-math}

\setmathfont{TeX Gyre Pagella Math}
\setmathfont[range={cal,bfcal},StylisticSet=1]{XITS Math}

\begin{document}
    $\symcal{ABC}$ 
\end{document}
bonanza
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1 Answers1

7

Combining different fonts in Math mode was traditionally implemented with the \fam primitive. unicode-math does not use \fam by default for OTF fonts, but you can change that by manually loading the fonts into mathgroups. The additional fonts are not loaded by the unicode-math machinery, so range etc. is not available:

\documentclass{article}
\usepackage{unicode-math}
\setmathfont{XITS Math}
\ExplSyntaxOn
\makeatletter
\cs_new:Npn\definemathgroup#1#2#3#4{
  \fontspec_set_family:Nnn\l_my_math_font_family{SmallCapsFont={},ItalicFont={},BoldFont={},Script=Math,#3}{#4}
  \exp_args:Nc\new@mathgroup{\string#1}
  \::c\::n\::f\:::\new@symbolfont{\string#1}{TU}{\l_my_math_font_family}{\seriesdefault}{\shapedefault}
  \cs_new:Npn#1##1{#2{\fam\use:c{\string#1}##1}}
}
\makeatother
\ExplSyntaxOff
\definemathgroup\mathmyothercal\symcal{}{Latin Modern Math}
\definemathgroup\mathtgcal\symcal{}{Tex Gyre DejaVu Math}
\begin{document}
\[ABC=\symcal{ABC}=\mathtgcal{ABC}=\mathmyothercal{ABC}\]
\end{document}

enter image description here

In the command \definemathgroup the second parameter(always \symcal in the examples above) select the math alphabet. This can be replaced by the other \sym... commands from unicode-math to load other math alphabets, e.g. \smybb for blackbord bold, \symfrak, \symit, \symnormal, ...

Marcel Krüger
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  • Thanks, that looks really great! Could you add what needs to be changed in the case other than calligraphic fonts are desired (e.g. fraktur, blackboard, typewriter, upright, italic etc. )? – bonanza Jul 06 '18 at 08:44
  • @bonanza Just replace \symcal with the corresponding \sym.... A full list is to be found in the unicode-math documentation. – Marcel Krüger Jul 06 '18 at 08:58
  • Thanks, I thought its more complicated as I believed that the \fontspec_set_family: .... line only loads the script glyphs. – bonanza Jul 06 '18 at 08:59
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    @bonanza Probably because of Script=Math, but that does not mean to only load script glyphs, it indicates that the font is used for mathematical writing instead of text in latin script, arabic script, etc. – Marcel Krüger Jul 06 '18 at 09:12
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    I added a issue to unicode-math for this https://github.com/wspr/unicode-math/issues/481 – Ulrike Fischer Jul 07 '18 at 16:00