[NTG-context] I (metapost) can't handle numbers bigger than 32767.99998

Zhichu chenzhichu at zjlab.org.cn
Fri Jul 5 11:42:30 CEST 2019


Hi Hans,

I simply put the unicode character there and everything works pretty well.

I was using only 5 Chinese characters in a document: 中國科學院, which means Chinese Academy of Sciences. Looked up their unicode number:

for c in u'中國科學院': print(ord(c))
20013
22283
31185
23416
38498

and draw every glyph carefully in a metapost file "cas-chars.mp":

beginglyph(20013,1000,1000,0);
  % a lot of fillings and drawingsendglyph;

then call them in a test file:

\definemetafont[cas-logo][cas-chars.mp]
\startTEXpage
\definefont[cas][cas at cas-logo]
    \cas 中國科學院\stopTEXpage

If I remove the beginglyph(38498,1000,1000,0) part in the mp file and “\cas 中國科學” will generate the correct output. or if I change beginglyph(38498,1000,1000,0) to  beginglyph(32767,1000,1000,0) and “\cas 中國科學\char"7FFF” also gives the right output.

I'm looking forward to “some” module :-)
------------------------------------------------------------------
From:Hans Hagen <j.hagen at xs4all.nl>
Send Time:2019 Jul. 5 (Fri.) 17:03
To:陈之初 <chenzhichu at zjlab.org.cn>; mailing list for ConTeXt users <ntg-context at ntg.nl>
Subject:Re: [NTG-context] I (metapost) can't handle numbers bigger than 32767.99998

On 7/5/2019 8:32 AM, Zhichu wrote:
> Hi everyone,
> 
> I was using metapost to generate some symbols, as in "tex/texmf-context/metapost/context/fonts/mpiv/demo-symbols.tex"

How do you use these symbols in a document? Do you call them up by 
number somehow? Using some glyph interface doesn't make much sense I 
think, as the font stuff comes from mf which is 8 bit. So, these 
character numbers (and simensions) are not really saying much, other 
than that they're properties of a figure.

(In context lmtx there will likely be some module for mp fonts. We can 
already do a lot but there is some more potential.)

Hans


> Occasionally, I want to customize a glyph whose charcode is a little large, say the character " 
> 院":
> ========================================
> ~~~IPython
> In [1]: for c in u'院': print(ord(c))
> 38498
> ========================================
> 
> so I wrote:
> ========================================
> beginglyph(38498,2,4,0) ; % high voltage
>      interim ahlength := 1 ;
>      drawarrow (1,4) -- (0,2) -- (2,3) -- (1,0) withcolor darkred ;
> endglyph ;
> ========================================
> 
> and I got:
> ========================================
> ! Enormous number has been reduced.
> l.60 beginzhglyph(38498
> );
> I can't handle numbers bigger than 32767.99998;
> so I've changed your constant to that maximum amount.
> ========================================
> 
> So charcode is a 15-bit integer?
> 
> Currently, I use `beginglyph(32767,2,4,0) ;` and call it with \char"7FFF. Not an elegant way I think.
> 
> Is there a fix? I checked the metapost manual and found that charcode is only used to set the filename to something like %{jobname}.%{charcode} I can't see why there's a limit for charcode.
> 
> 
> 
> 
> 
> 
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