···<date: 2013-08-04, Sunday>···<from: Dmitriy Tokarev>···

> Hi all,
> 
> I want to set the font size by using the dimension variable, but it doesn't work. What am I doing wrong?
> 
> \definemeasure[AAA][20pt]
> \newdimen\BBB \BBB=20pt
> 
> \starttext
> TEXT
> 
> % don't work
> \switchtobodyfont[\measure{AAA}]
> AAA
> 
> % don't work
> \switchtobodyfont[\the\BBB]
> BBB
> 
> % ok
> \switchtobodyfont[20pt]
> TEXT 20pt
> 
> \stoptext

Hi Dmitriy,

the size-related arguments to \switchtobodyfont and
\setupbodyfont aren’t real TeX dimensions but identifiers for
predefined bodyfont sets. Example:

  \def\mainfontsize{20pt}
  \definebodyfontenvironment [\mainfontsize]

  \starttext
    TEXT
    \switchtobodyfont [\mainfontsize]
    TEXT 20pt
  \stoptext

See this thread for some background info:

  http://www.mail-archive.com/ntg-context@ntg.nl/msg63901.html

Best regards,
Philipp