Re: Persian digits in math formulas

[Hans Hagen <pragma@wxs.nl>]

On 8/15/2013 4:22 PM, Mingranina Gingranina wrote:
> Dear All,
>   Hello,
>
>   I am trying to use Persian digits in math formulas. My document reads:
>
> \font\4 = {name:dejavusans} at 10pt
>
> \font\5 = {name:dejavusans} at 7pt
>
> \font\6 = {name:dejavusans} at 5pt
>
> \textfont4=\4 \scriptfont4=\5 \scriptscriptfont4=\6
>
> \Umathcode`3="1"4`۳
>
> \definefontfeature [persian] [arabic]
>
> \mainlanguage[pe]
>
> \starttext
>
>    \definedfont[dejavusans*persian]
>
>    \setupalign[r2l]
>
>      این یک آزمایش است.
>
>    3+2=5
>
>    $3+2=5$
>
>      \setupalign[l2r]
>
>      This is a test.
>
>    3+2=5
>
>    $3+2=5$
>
> \stoptext
>
>   However in the output the replaced digit "3" disappears.
>   Any help is gratefully appreciated.

For a text font you can add:

\definefontfeature [persian-fake-math] [arabic] [anum=yes]

and say:

     \definedfont[dejavusans*persian-fake-math]

but ... nicer is this:

\mainlanguage[pe]

\usetypescriptfile[dejavu]

\definetypeface [dejavu] [rm] [serif] [dejavu]   [default]
\definetypeface [dejavu] [ss] [sans]  [dejavu]   [default]
\definetypeface [dejavu] [tt] [mono]  [dejavu]   [default]
\definetypeface [dejavu] [mm] [math]  [xitsbidi] [default] 
[direction=both,rscale=1.2]

\setuptypeface[dejavu]

\starttext

     \start \setupalign[r2l] \setupmathematics[align=r2l] arabic: این یک 
آزمایش است. \par text: 3+2=5 \par math: $3+2=5$ $\sqrt{3+2=5}$ \par \stop

     \start \setupalign[l2r] \setupmathematics[align=l2r] latin:  This 
is a test.    \par text: 3+2=5 \par math: $3+2=5$ $\sqrt{3+2=5}$\par \stop

\stoptext

(see bidi-001.tex in the test suite)

Hans

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