Am 25.03.10 16:21, schrieb Hans Hagen:
Who about something like (pseudocode)
\definecharacterkerning[letterspace]
\def\letterspace
{\bgroup
\dosingleempty\doletterspace}
\def\doletterspace[#1]#2% use \groupedcommand?
{\iffirstargument
\setupcharacterkerning[letterspace][factor=\ctxlua{tex.sprint(#1/1000)}]}%
\fi
\setcharacterkerning[letterspace]#2%
\egroup}
\starttext
text \letterspace{text} text \letterspace[200]{text} text
looks ok, apart from the name ... we don't space letters but
characters (or glyphs) so maybe \kerncharacters or so
to be more concrete i think about this (why is the last value taken for
the complete paragraph?)
\definecharacterkerning[kerncharacters]
\unexpanded\def\kerncharacters
{\dosingleempty\dokerncharacters}
\def\dokerncharacters[#1]%
{\groupedcommand
{\iffirstargument
\setupcharacterkerning[kerncharacters][factor=\ctxlua{tex.write(#1/1000)}]%
\fi
\setcharacterkerning[kerncharacters]}
{}}
\setuphead[section][style=\sca,textstyle={\kerncharacters[250]}]
\starttext
\section{Section}
text \kerncharacters{text} text \kerncharacters[200]{text} text
\kerncharacters[2000]{text} text
text {\kerncharacters text} text {\kerncharacters[200] text} text
{\kerncharacters[2000] text} text
text \kerncharacters[200]{text} text \kerncharacters[1000]{text} text
text \kerncharacters[1000]{text} text \kerncharacters[200]{text} text
\stoptext
Wolfgang
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