* drawoptions in \startMPinclusions
@ 2007-06-14 16:36 nicola
2007-06-14 18:08 ` drawoptions in startMPinclusions Aditya Mahajan
0 siblings, 1 reply; 2+ messages in thread
From: nicola @ 2007-06-14 16:36 UTC (permalink / raw)
To: ntg-context
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? Or
do I misunderstand the purpose of \startMPinclusions (I have assumed
that it inserts the text verbatim inside each figure definition)? I am
using
ConTeXt ver: 2007.01.12 15:56 MKII fmt: 2007.6.8 int: english/english
Nicola
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* Re: drawoptions in startMPinclusions
2007-06-14 16:36 drawoptions in \startMPinclusions nicola
@ 2007-06-14 18:08 ` Aditya Mahajan
0 siblings, 0 replies; 2+ messages in thread
From: Aditya Mahajan @ 2007-06-14 18:08 UTC (permalink / raw)
To: ntg-context
Quoting nicola <vitacolo@dimi.uniud.it>:
> 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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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : https://foundry.supelec.fr/projects/contextrev/
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