Quoting nicola <[EMAIL PROTECTED]>:
> Hi,
> the following code
>
> \startMPinclusions
> drawoptions(withpen pencircle scaled 1mm);
> u := 1cm;
> \stopMPinclusions
>
> \startreusableMPgraphic{foo}
> draw origin--(u,u);
> \stopreusableMPgraphic
>
> \starttext
> \midaligned{\reuseMPgraphic{foo}}
> \stoptext
>
> produces a line with default thickness, not 1mm wide. Is this a bug?
No a feature of metapost. beginfig resets drawoptions. Otherwise
drawoptions from one figure will also affect the output of another
figure.
> Or > do I misunderstand the purpose of \startMPinclusions (I have assumed
> that it inserts the text verbatim inside each figure definition)?
It inserts text *before* the figure definitions. Have a look at the
resulting -mpgraph.mp file. The problem is that in metapost beginfig
resets drawoptions. This is how beginfig is defined
def beginfig(expr c) =
begingroup
charcode:=c;
clearxy; clearit; clearpen;
pickup defaultpen;
drawoptions();
scantokens extra_beginfig;
enddef;
So, you can use
\startMPinclusions
extra_beginfig := "drawoptions(withpen pencircle scaled 1mm)" ;
u := 1cm;
\stopMPinclusions
to override beginfig's redefinitions. I hope that some day there will
be a overhaul of plain.mp to something more flexible. Metafun provides
some useful enhancements, but the metapost user interface is still very
low level.
Aditya
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