[NTG-context] Re: Playing with math font setup

[Hans Hagen <j.hagen@xs4all.nl>]

On 5/21/2024 4:40 PM, Ali Ali wrote:
> Hi, hope everyone's doing well!
> 
> Is it possible to setup math font so that all the basic ascii characters (i.e. a..zA..Z0..9) glyphs are substituted with current serif (or sans) font. I tried playing with fallback thing but it didn't got me anywhere!
> 
> e.g. $x$ will use the 'x' glyph from current serif italic font, and $\bf x$ will use the 'x' glyph from current serif bold font!
> I would appreciate any suggestions and help!
> 
> Suppose we have all the required font files in the 'font' directory of the working directory, and below is the minimal source code!
> """
> \starttypescriptcollection[CustomFontSelection]
>    \starttypescript [serif] [CustomFontSelection] [name]
>      \setups[font:fallback:serif]
>      \definefontsynonym [Serif]
>          % [file:font/Lora-Regular.ttf]
>          [file:font/Lora-Medium.ttf]
>          [features=default,fallbacks=Serif]
>      \definefontsynonym [SerifBold]
>          [file:font/Lora-Bold.ttf]
>          [features=default,fallbacks=SerifBold]
>      \definefontsynonym [SerifItalic]
>          % [file:font/Lora-Italic.ttf]
>          [file:font/Lora-MediumItalic.ttf]
>          [features=default,fallbacks=SerifItalic]
>      \definefontsynonym [SerifBoldItalic]
>          [file:font/Lora-BoldItalic.ttf]
>          [features=default,fallbacks=SerifBoldItalic]
>    \stoptypescript
> 
>    \starttypescript [math] [CustomFontSelection] [name]
>      %%% \definefontfallback [MathRomanFallBack]
>      %%%     [SansItalic]
>      %%%     [extendedlatin]
>      %%%     [force=yes]
>      \definefontsynonym [MathRoman]
>          [file:font/STIXTwoMath-Regular.otf]
>          [features=math,fallbacks=MathRomanFallBack]
>    \stoptypescript
> 
>    \starttypescript[CustomFontSelection]
>      \definetypeface [CustomFontSelection] [rm] [serif] [CustomFontSelection]    [default] [rscale=0.9]
>      \definetypeface [CustomFontSelection] [ss] [sans]  [newcomputermodern-book] [default]
>      \definetypeface [CustomFontSelection] [tt] [mono]  [newcomputermodern-book] [default]
>      \definetypeface [CustomFontSelection] [mm] [math]  [CustomFontSelection]    [default] [rscale=0.97]
>    \stoptypescript
> \stoptypescriptcollection
> 
> \setupbodyfont[CustomFontSelection]
> 
> 
> \starttext
> 
> We use $X$, $Y$, $Z$ and $n$, $m$, etc. $\sin(x) \to \limsup x_n$ whatever.
> 
> \mathematics{%
>    \delta_{ij} =
>      \startmathcases
>      \NC 1 \NC \text{if } i = j \NR
>      \NC 0 \NC \text{otherwise} \NR
>      \stopmathcases
> }
> 
> We use $\bf X$, $\bf Y$, $\bf Z$ and $\bf n$, $\bf m$, etc. $\bf \sin(x) \gets \limsup x_n$ whatever.
> 
> \stoptext
> """

More like this (if you want decent math). Also, use a math font as base 
that matches the fallbacks, also metric wise.

\starttypescriptcollection[CustomFontSelection]

     \starttypescript [serif] [CustomFontSelection] [name]
         \setups[font:fallback:serif]
         \definefontsynonym [Serif]           [name:dejavuserif] 
   [features=default]
         \definefontsynonym [SerifBold]       [name:dejavuserifbold] 
   [features=default]
         \definefontsynonym [SerifItalic]     [name:dejavuserifitalic] 
   [features=default]
         \definefontsynonym [SerifBoldItalic] 
[name:dejavuserifbolditalic] [features=default]
     \stoptypescript

     \starttypescript [math] [CustomFontSelection] [name]
         \definefontfallback [MathRomanFallBack]
             [name:dejavuserifitalic]
             [lowercaseitalic,uppercaseitalic]
             [force=yes]
         \definefontfallback [MathRomanFallBack]
             [name:dejavuserifbolditalic]
             [lowercasebolditalic,uppercasebolditalic]
             [force=yes]
         \definefontfallback [MathRomanFallBack]
             [name:dejavuserif]
             [lowercasenormal,uppercasenormal]
             [force=yes]
         \definefontfallback [MathRomanFallBack]
             [name:dejavuserifbold]
             [lowercasebold,uppercasebold]
             [force=yes]
         \definefontsynonym
             [MathRoman]
             [file:stixtwomath-regular.ttf]
 
[features={math\mathsizesuffix,stixtwomath,stixtwo:mathextra,mathextra},%
              fallbacks=MathRomanFallBack,%
              goodies=stixtwo-math]
         \definefontsynonym
             [MathRomanBold]
             [file:stixtwomath-regular.ttf]
 
[features={math\mathsizesuffix,stixtwo-math-bold,stixtwomath,stixtwo:mathextra,mathextra},%
              fallbacks=MathRomanFallBack,%
              goodies=stixtwo-math]
     \stoptypescript

     \starttypescript[CustomFontSelection]
         \definetypeface [CustomFontSelection] [rm] [serif] 
[CustomFontSelection]    [default] [rscale=0.9]
         \definetypeface [CustomFontSelection] [ss] [sans] 
[newcomputermodern-book] [default]
         \definetypeface [CustomFontSelection] [tt] [mono] 
[newcomputermodern-book] [default]
         \definetypeface [CustomFontSelection] [mm] [math] 
[CustomFontSelection]    [default] [rscale=0.97]
     \stoptypescript

\stoptypescriptcollection

\setupbodyfont[CustomFontSelection]


\starttext

We use $X$, $Y$, $Z$ and $n$, $m$, etc. $\sin(x) \to \limsup x_n$ whatever.

We use $\bf X$, $\bf Y$, $\bf Z$ and $\bf n$, $\bf m$, etc. $\bf \sin(x) 
\gets \limsup x_n$ whatever.

\stoptext


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