Re: cairopdf terminal help (for Japanese)

[Shigeharu T. <sh...@ie...>]

shige 08/03 2007
----------------

Ethan Merritt wrote:
> On my linux systems, the Japanese + cairopdf problem can be
> solved by adding a call to 
>         setlocale(LC_CTYPE,"");
> on program entry. That may or may not be an acceptable change, however.
> 
> Perhaps it would be better to make this part of the "set encoding"
> command.  For terminals such as cairopdf it would be sufficient
> to add an option
>         set encoding locale
> without actually adding to the internal table of known encodings.
> I append a patch below that implements this.

I tested your patch and it works fine on Solaris 9 and FreeBSD 
5.4. 

http://takeno.iee.niit.ac.jp/~shige/unix/gnuplot/data/cairopdf-euc-1.pdf
http://takeno.iee.niit.ac.jp/~shige/unix/gnuplot/data/cairopdf-utf-1.pdf

are the result of the followings:
 
  set encoding locale
  set term cairopdf
  set out 'cairopdf.pdf'
  set title "ABCDE (jastring)" font "Sazanami Gothic,20"
  set xlabel "ABCDE (jastring)" font "IPAGothic,16"
  set ylabel "ABCDE (jastring)" font "IPAMincho,14"
  set label "ABCDE (jastring)" rotate by 60 \
    font "Sazanami Mincho,24" tc lt 3
  plot sin(x)
  set out

> I was already planning to add utf8 (needed for png terminal + Adobe
> symbol font, and for PostScript using patchset #1746352).
> Perhaps we also should have some or all of 
>     EUC-JP shift-jis ujis iso_2022_jp
> But I really don't know how to support these for most terminal types.

I think this is not so easy. 

For example, gdlib 2.X supports unicode encoding fonts and we can
use UTF-8 string by gdImageStringTTF(). But for other encoding 
strings (EUC-JP, Shift_JIS, ISO-2022-JP), we must build the gdlib
with the compilation flag -DJISX0208. That is, the treatment of 
Japanese encoding strings depends on the library itself. To give 
the EUC-JP strings to default gdlib, we must convert the string 
encoding to utf-8 in gnuplot (by iconv(3), for example).

+========================================================+
 Shigeharu TAKENO     NIigata Institute of Technology
                       kashiwazaki,Niigata 945-1195 JAPAN
 sh...@ie...   TEL(&FAX): +81-257-22-8161
+========================================================+