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< [[Graphics]]|[[Metafun]]|[[Metapost]]>__TOC__
ConTeXT provides a tight integration of TeX and [[Metapost]]. Metapost can used behind the scenes for some graphic trickery. This integration is also helpful for drawing figures in metapost and use them in the document. Some of the commonly used commands for this are
==<cmd>startMPenvironment</cmd>==This is used to change the body font for metapost graphics'''THE [[manual:metafun-p. For examplepdf|MetaFun manual]]''', to get the text also available in metapost graphics in times, usea [[manual:metafun-s.pdf|screen version]].
<texcode>
\startMPenvironment
\usetypescript[times][texnansi]
\switchtobodyfont[times,10pt]
\stopMPenvironment
</texcode>
An MPenvironment This page is sort a brief overview of like <b>verbatimtex..etex</b> in regular (standalone) MetaPost figures. Here is an example some of using verbatimtex in a regular MetaPost figure:<texcode>verbatimtex% center-align and stack the two arguments\def\2#1#2{\vbox{\halign{\hfil##\hfil\cr #1\cr #2\cr}}}etexcommonly used commands.
beginfig(1)
z0 = (2in,0);
draw fullcircle scaled 3cm;
label(btex \2{sun}{mass $M$} etex, origin);
draw fullcircle scaled 1.5cm shifted z0;
label(btex \2{earth}{mass $m$} etex, z0);
endfig;
end
</texcode>
To integrate such a graphic into a ConTeXt source file, there are several choices. = Commonly used commands =
1. Place the definition of <b>\2</b> in the MPenvironment. However; {{cmd|defineMPinstance}}, that fails (as of the 2006{{cmd|setupMPinstance}}: used to set up MetaPost invocations with particular features.09One use case could be to select a sans serif font for all MetaPost labels.28 beta but it: {{cmd|startMPenvironment}} '''is DEPRECATED'''s likely in which one could place settings that one only wanted to work soonapply in the MetaPost environment, knowing Hans) because but not in the definition is stored as a macro document itself, and then the parameters #1 . One should use {{cmd|defineMPinstance}} and #2 become ##1 and ##2{{cmd|setupMPinstance}}, alas. There is a <b>\startbuffer</b> trick that Hans posted on the mailing listinstead. But perhaps the easiest is:
2. Place the definition of <b>\2</b> in the ConTeXt environment; {{cmd|startMPinclusions}}: Inside, one can specify MetaPost files to ''input'', and change <b>btex..etex</b> to <b>\sometxt</b>also define MetaPost functions. Here's an example:
<texcode>% in a large document; {{cmd|startuseMPgraphic}}, put this def in an environment\def\2#1#2{\vbox{\haligncmd|useMPgraphic}}: defines a piece of graphics code that is processed anew every time the graphic is placed with {\hfil##\hfil\cr #1\cr #2\cr}{cmd|useMPgraphic}}.
\starttext; {{cmd|startreusableMPgraphic}}, {{cmd|reuseMPgraphic}}: For graphics that are the same every time, it is better to use {{cmd|startreusableMPgraphic}}: the graphic is compiled only once, and the one resulting picture can be placed at various points with {{cmd|reuseMPgraphic}}.
% earth and sun\startreusableMPgraphic{fig} z0 = (2in,0); draw fullcircle scaled 3cm; label(\sometxt{\2{sun}{mass $M$cmd|startMPcode}}: When reusing a graphic is not important, origin); draw fullcircle scaled 1.5cm shifted z0; label(\sometxtyou can simply use {\2{earthcmd|startMPcode}{mass $m$}}, z0);\stopreusableMPgraphic.
\reuseMPgraphic; {fig{cmd|startMPpage}}: produces a page a containing MetaPost graphic. The page is just large enough to contain the graphic. The resulting pdf is self-contained (it has all the fonts embedded). This is useful if you want to send the figure to a coauthor or a journal.
\stoptext; {{cmd|startstaticMPfigure}}, {{cmd|usestaticMPfigure}}: The {{cmd|startuseMPgraphic}} series of commands were designed for using MetaPost for drawing fancy frames and backgrounds and not for using <i>stand-alone</texcodei>graphics for a document. {{cmd|startstaticMPfigure}} creates a separate pdf file containing the graphic. This pdf can be included in the document using {{cmd|usestaticMPfigure}}. ConTeXt is clever enough to recompile the resulting MetaPost file only if something inside the {{cmd|startstaticMPfigure}} has changed.
Warning: <b>\sometxt</b> cannot be used in loops. Instead use <b>\textext</b>. [Someone who understands why should expand this statement!]= Documentation and links =
==<cmd>startMPinclusions<* [[manual:mmakempy.pdf|MakeMPY]]: create MetaPost outlines (by Pragma)* [[Flow Charts|FlowCharts]]: encapsulated application, demonstration of MetaPost/cmd>==MetaFunThis can be used for specifying metapost files to ''input'' and also to define metapost functions* [http://www.pragma-ade.com/general/sources/mptopdf.For example<texcode>\startMPinclusions input boxes ; vardef my_metapost_funpdf MPtoPDF]: create PDF from MetaPost (expr varby Pragma)= * [http://www.pragma-ade.com/show-gra.pdf a few examples of MetaPost graphics] enddef ;* [http://www.pragma-ade.com/articles/art-puzz.pdf Puzzling graphics in MetaPost] (article)\stopMPinclusions<* [http://www.ntg.nl/maps/25/texcode>15.pdf metapost metafun. Hans Hagen at MAPS]
==<cmd>startMPpage</cmd>==----This produces a page containing metapost graphic. The resulting pdf is self contained (it has all the fonts embedded) This is useful if you want to send the figure to a coauthor or a journal. For example, one can have[[Category:Graphics]] <texcode>\starttext\startMPpage draw fullcircle scaled 2cm ; dotlabel.bot(textext("(0,0)"),origin) ;\stopMPpage[[Category:Metapost]]
\startMPpage
draw fullcircle scaled 2cm ;
drawarrow (0,0)--(1cm,0) ;
label.bot(textext("$r$"),(5mm,0)) ;
\stopMPpage
\stoptext</texcode> Processing this file using<texcode> texmfstart texexec --pdf filename</texcode>gives a pdf with two pages of graphics. ==<cmd>startstaticMPfigure</cmd>==<cmd>startuseMPgraphic</cmd> series of commands were designed for using metapost for drawing fancy frames and backgrounds and not for using <i>stand-alone</i> graphics for a document. <cmd>startstaticMPfigure</cmd> creates a separate pdf file containing the graphic. This pdf can be included in the document using <cmd>usestaticMPfigure</cmd>. Context is clever enough to recompile the resulting metapost file, only if something inside the start stop staticMPgraphic has changed. For example,<texcode>\startstaticMPfigure{center} draw fullcircle scaled 2cm ; dotlabel.bot(textext("(0,0)"),origin) ;\stopstaticMPfigure \startstaticMPfigure{radiusMetaPost see also} draw fullcircle scaled 2cm ; drawarrow (0,0)--(1cm,0) ; label.bot(textext("$r$"),(5mm,0)) ;\stopstaticMPfigure \starttext Circle centered \usestaticMPfigure[center][width=1cm] at origin with radius\usestaticMPfigure[radius][width=1cm] $r=1\,\text{cm}$. \stoptext</texcode> * '''center''' and '''radius''' above are ''labels'' that are used to access the figure.* <cmd>usestaticMPfigure</cmd> takes the first argument as the ''label'' of the figure to be inserted. The second argument has the same options as the second argument of <cmd>externalfigure</cmd>* To force the figure files to be regenerated, remove all the <code>*.mp.md5</code> files from the current directory.==Transparent colors in figures== You can use transparent colors! For example: <texcode>\runMPgraphicstrue\setupcolors[state=start]\starttext\startreusableMPgraphic{a}fill unitsquare scaled 1cm withcolor yellow;fill unitsquare shifted (0.5,0.5) scaled 1cm withcolor transparent(1,0.5,red);\stopreusableMPgraphic \placefigure[force,none]{Metapost navbox}{\reuseMPgraphic{a}}\stoptext</texcode> If you see black squares rather than a yellow one underneath a partially transparent red one, then you probably hit the 'missing specials' problem diagnosed by Taco (ntg-context list, 23 Sep 2006 22:00:42 +0200): <pre>This all sounds like the 'missing specials' problem that is causedby conflicting -progname= arguments when using the web2c versionof metapost. Make sure you do not have conflicting memory settings for both main_memory.mpostas well as main_memory.metafun The best is to remove all trace of '.mpost' and '.metafun' memorysettings from your texmf.cnf, but at least make sure all the'.mpost' and 'metafun' values are the same . Then regenerate metafun using texexec --make, and all should bewell again.</pre> And indeed it fixed it for me (Sanjoy). These were the memory setting in the ''/etc/texmf/texmf.d/95NonPath.cnf''configlet that is part of Debian and Ubuntu distributions of TeX: <pre>main_memory = 1000000 % words of inimemory available; also applies to inimf&mpmain_memory.context = 1500000main_memory.mpost = 1500000</pre> I commented out the .mpost line (there was no separate metafun line,which I guess instead used the main_memory value of 1000000),regenerated ''/etc/texmf/texmf.cnf'' with ''update-texmf'' (as root), then regenerated metafun with ''texexec --make metafun'' (as me) and transparency worked. [[Category:Graphics]][[Category:Metapost]]
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MetaFun is ConTeXt extension the [[MetaPost]] language. It provides a tight integration of both TeX and [[MetaPost]]. MetaPost can used behind the scenes for some graphic trickery. This integration is also helpful for drawing figures in MetaPost and use them in the document.
