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-<head>
-<title>UK TeX FAQ -- question label mpprologues</title>
-</head><body>
-<h3>Displaying MetaPost output in <i>ghostscript</i></h3>
-<p/>MetaPost ordinarily expects its output to be included in some context
-where the &#8216;standard&#8217; Metafont fonts (that you&#8217;ve specified) are already
-defined &#8212; for example, as a figure in TeX document. If you&#8217;re
-debugging your MetaPost code, you may want to view it in
-<i>ghostscript</i> (or some other PostScript previewer). However,
-the PostScript &#8216;engine&#8217; in <i>ghostscript</i> <em>doesn&#8217;t</em>
-ordinarily have the fonts loaded, and you&#8217;ll experience an error such
-as
-<blockquote>
-<pre>
-Error: /undefined in cmmi10
-</pre>
-</blockquote><p>
-There is provision in MetaPost for avoiding this problem: issue the
-command <code>prologues := 2;</code> at the start of the <code>.mp</code> file.
-<p/>Unfortunately, the PostScript that MetaPost inserts in its output,
-following this command, is incompatible with ordinary use of the
-PostScript in inclusions into (La)TeX documents, so it&#8217;s best to
-make the <code>prologues</code> command optional. Furthermore, MetaPost takes a
-very simple-minded approach to font encoding: since TeX font
-encodings regularly confuse sophisticated minds, this can prove
-troublesome. If you&#8217;re suffering such problems (the symptom is that
-characters disappear, or are wrongly presented) the only solution is
-to view the &#8216;original&#8217; MetaPost output after processing through
-LaTeX and <i>dvips</i>.
-<p/>Conditional compilation may be done either
-by inputting <i>MyFigure.mp</i> indirectly from a simple wrapper
-<i>MyFigureDisplay.mp</i>:
-<blockquote>
-<pre>
-prologues := 2;
-input MyFigure
-</pre>
-</blockquote><p>
-or by issuing a shell command such as
-<blockquote>
-<pre>
-mp '\prologues:=2; input MyFigure'
-</pre>
-</blockquote><p>
-(which will work without the quote marks if you&#8217;re not using a Unix
-shell).
-<p/>A suitable LaTeX route would involve processing
-<i>MyFigure.tex</i>, which contains:
-<blockquote>
-<pre>
-\documentclass{article}
-\usepackage{graphicx}
-\begin{document}
-\thispagestyle{empty}
-\includegraphics{MyFigure.1}
-\end{document}
-</pre>
-</blockquote><p>
-Processing the resulting DVI file with the <i>dvips</i>
-command
-<blockquote>
-<pre>
-dvips -E -o MyFigure.eps MyFigure
-</pre>
-</blockquote><p>
-would then give a satisfactory Encapsulated PostScript file. This
-procedure may be automated using the <i>Perl</i> script
-<i>mps2eps</i>, thus saving a certain amount of tedium.
-<p/>The Plain TeX user may use an adaptation of a jiffy of Knuth&#8217;s, by
-Dan Luecking. Dan&#8217;s version <i>mpsproof.tex</i> will work under
-TeX to produce a DVI file for use with <i>dvips</i>, or
-under PDFTeX to produce a PDF file, direct. The output is
-set up to look like a proof sheet.
-<p/>A script application, <i>mptopdf</i>, is available in recent
-(La)TeX distributions: it seems fairly reliably to produce
-PDF from MetaPost, so may reasonably be considered an answer to
-the question&#8230;
-<dl>
-<dt><tt><i>mps2eps</i></tt><dd><a href="http://mirror.ctan.org/support/mps2eps.zip">support/mps2eps</a> (or <a href="http://mirror.ctan.org/support/mps2eps/">browse the directory</a>)
-<dt><tt><i>mpsproof.tex</i></tt><dd><a href="http://mirror.ctan.org/graphics/metapost/contrib/misc/mpsproof.tex">graphics/metapost/contrib/misc/mpsproof.tex</a>; <a href="http://mirror.ctan.org//help/Catalogue/entries/mpsproof.html">catalogue entry</a>
-<dt><tt><i>mptopdf</i></tt><dd>Part of <a href="http://mirror.ctan.org/graphics/metapost/contrib/tools/mptopdf.zip">graphics/metapost/contrib/tools/mptopdf</a> (or <a href="http://mirror.ctan.org/graphics/metapost/contrib/tools/mptopdf/">browse the directory</a>); <a href="http://mirror.ctan.org/help/Catalogue/entries/pdf-mps-supp.html">catalogue entry</a>
-</dl>
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mpprologues">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mpprologues</a>
-</body>