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<h2>2. Invoking PIC
<a name="2. Invoking PIC"></a>
</h2>

Every pic description is
a little program describing drawing actions. The
[gtn]roff-dependent versions compile the program by
pic(1) into gtroff(1) macros; the
pic2plot(1) implementation uses a plotting library to
draw the picture directly. Programs that process or display
gtroff(1) output need not know or care that parts of
the image began life as pic descriptions.

The pic(1) program tries
to translate anything between .PS and .PE
markers, and passes through everything else. The normal
definitions of .PS and .PE in the ms
macro package and elsewhere have also the side-effect of
centering the pic output on the page.

<h3>2.1. PIC Error Messages
<a name="2.1. PIC Error Messages"></a>
</h3>

If you make a pic syntax
error, gpic(1) issues an error message in the
standard gcc(1)-like syntax. A typical error message
looks like this

pic:pic.ms:&lt;nnn&gt;:
parse error before &lsquo;&lt;token&gt;&rsquo; 
pic:pic.ms:&lt;nnn&gt;: giving up on this picture

where &lang; nnn&rang; is a line
number, and &lang; token&rang; is a token near (usually just
after) the error location.
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