In addition to European font it is also possible to use non-latin based fonts such as Cyrillic, Japanese and Chinese.
In all cases a suitable TTF font that supports the non-latin based language must be available.
For Cyrillic support the define LANGUAGE_CYRILLIC in jpg-config.php must be set to true. It is then possible to use a suitable Cyrillic font as replacement for the ordinary fonts.
For Chinese character set JpGraph supports both BIG5 and GB2312 encoding. For BIG5 encoding the PHP installation must have support for the "iconv()" function. Furthermore the define CHINESE_TTF_FONT must be set to the name of the Chinese BIG5 font that is to be used. By default this is set to "bkai00mp.ttf". To use the Chinese BIG5 font in the scripts one must then specify the font family as FF_CHINESE.
To use the alternative font files "simsun.ttc" and "simhei.ttf" (which uses the GB2312 encoding) the only step needed is to install those fonts in the normal TTF font directory and then specify the font family as FF_SIMSUN, the "simhei.ttf" is used when the font style is specified as FS_BOLD.