Hi ConTeXt users, That's indeed magic and it works! Hans, thanks for your prompt answer! But I would like to take this a step further, by introducing a macro within the start/stopuseMPgraphic structure like so: \startuseMPgraphic{name}{s::lbl} def mymacro (text lb) = pair a ; a := (3cm,3cm) ;label.top("String: " & str lb,a) ; enddef ; mymacro(\MPvariable{lbl}) ; \stopuseMPgraphic and this works too, but what if I introduce another text argument like: \startuseMPgraphic{name}{s::lbl,s::label} def mymacro (text lb,lbx) = pair a ; a := (3cm,3cm) ;label.top("String: " & str lb & ", " & str lbx,a) ; enddef ; mymacro(\MPvariable{lbl},\MPvariable{label}) ; \stopuseMPgraphic However this doesn't work! It gives the following error: ! Missing argument to mymacro. Isn't that weird? But perhaps it has to do with me not understanding argument passing properly within METAPOST macros! Can someone please explain why this 2 argument example doesn't work? (But maybe this isn't the proper list to ask questions like these. If so, I'm sorry for bothering you!) Regards, Gerard On 16-09-2020 16:32, Geert Verhaag wrote:
Hi,
I'm trying to pass a string argument value to an MPgraphic but it doesn't seem to work:
Tried the following:
\startuseMPgraphic{name}{lbl} pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ; \stopuseMPgraphic
\starttext \useMPgraphic{name}{lbl=1} \stoptext
The above works as expected!
But the following doesn't:
\startuseMPgraphic{name}{lbl} pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ; \stopuseMPgraphic
\starttext \useMPgraphic{name}{lbl=abc} \stoptext
It yields:
1 \startuseMPgraphic{name}{lbl} 2 pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ; 3 \stopuseMPgraphic 4 5 %\startuseMPgraphic{name}fill fullcircle scaled 200pt withcolor .625yellow ;\stopuseMPgraphic 6 7 \starttext 8 Example: 9 >> \useMPgraphic{name}{lbl=abc} 10 \stoptext 11
<to be read again> a \m_meta_current_variable a-a bc <argument> ... \hbox {\scratchdimen \m_meta_current_variable sp}\ifzeropt \wd \b_meta_v... \secondoftwoarguments #1#2b-#2
\9>>1 #1,2-\meta_prepare_instance_variable {#1} \syst_helpers_do_process_comm... \syst_helpers_do_process_comma_list ...rgument #1, ]\relax \global \advance \... ... l.9 \useMPgraphic{name}{lbl=abc}
So it seems that only numbers can be passed not character strings! Why is that? Is there a possibility to achieve this functionality?
Regards, Gerard
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