Peter Rolf wrote:
Hi all,
I pass a string to a MP graphic using \setMPtext{LABEL}{TEXT}. The
string can also be empty, and then no action (for the text) is taken.
How can I test in MP, if the given \MPstring{LABEL} is empty?
I have tried everything I can imagine in the last one hour, but no
success. Not my day...
This is the old, not working version
if not(\MPstring{LABEL}="") : % is always true.
unless to set it to nothign (currently you don't assign it at all)
take this:
\setupcolors[state=start]
\starttext
\startuseMPgraphic{test}
fill fullcircle
scaled 1cm
withcolor if not(\MPstring{XX}="") : red else : green fi ;
\stopuseMPgraphic
\useMPgraphic{test} \start \setMPtext{XX}{} \useMPgraphic{test} \stop
\unprotect
\def\MPtext #1{\executeifdefined{\@@MPT#1}\empty}
\def\MPstring #1{"\executeifdefined{\@@MPT#1}\empty"}
\def\MPbetex #1{btex \executeifdefined{\@@MPT#1}\empty etex}
\protect
\useMPgraphic{test} \start \setMPtext{XX}{} \useMPgraphic{test} \stop
\stoptext
the current definitions return "\relax" when a text is not defined; i'll
change the definitions
Hans
_______________________________________________
ntg-context mailing list
ntg-context@ntg.nl
http://www.ntg.nl/mailman/listinfo/ntg-context
