Re: Using dsrom with MKIV

[Aditya Mahajan <adityam@umich.edu>]

On Wed, 24 Dec 2008, Hans Hagen wrote:

> Aditya Mahajan wrote:
>> Hi,
>> 
>> The dsrom math font only works partially with MKIV, and I do not understand 
>> what is happening. Consider the following example from 
>> http://wiki.contextgarden.net/Doublestroke (which I wrote, after 
>> suggestions on the mailing list). One needs the fonts, which are part of TL 
>> and are also available at http://ctan.org/tex-archive/fonts/doublestroke/
>> 
>> %=======================================================================
>> \loadmapfile[dstroke.map]
>> 
>> \starttypescript [math] [modern,computer-modern,latin-modern,ams] [size]
>>   \definebodyfont [17.3pt,14.4pt,12pt][mm]
>>                   [mb=dsrom12 sa 1]
>>   \definebodyfont [11pt,10pt,9pt] [mm]
>>                   [mb=dsrom10 sa 1]
>>   \definebodyfont [8pt,7pt,6pt,5pt,4pt] [mm]
>>                   [mb=dsrom8 sa 1]
>> \stoptypescript
>> 
>> \definetypeface [modern] [mm] [math] [modern] [ams] [encoding=texnansi]
>> \setupbodyfont[reset,modern,10pt]
>> 
>> \definefamilysynonym [default] [doublestroke]   [mb]
>> 
>> \def\dstroke {\fam\purefamily  {doublestroke}}
>> 
>> \def\doublestroke#1{{\dstroke#1}}
>> 
>> \starttext
>> $\doublestroke{E} \doublestroke{1}$
>> \stoptext
>> %=======================================================================
>> 
>> 
>> This works correctly in MKII (Both E and 1 are shown in dsrom font). 
>> However, in MKIV the 1 is shown in LM Roman rather than dsrom.
>> 
>> Is this a bug in context font handling, or a bug in the typescript?
>> 
>> I am using: context version: 2008.12.01 10:25
>> This is LuaTeX, Version snapshot-0.30.3-2008112812
>
> \def\doublestroke#1{{\fam\mbfam#1}}

Thanks. I never understood why one needed to define such things using 
familysynonyms. The above defintition makes more sense. I will clean up 
the wiki examples for using other fonts.

> \starttext
> $\doublestroke{E} \doublestroke{1}$
> \stoptext
>
> indeed does not give a dstroked 1 ... i wonder why; maybe something with the 
> mathcodes

But why does it work if I replace mc by mr (as Wolfgang showed). Also, how 
can I check the mathcode of a character, other than going through the 
sources and figuring out where it is set.

Aditya
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