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<h2>18. Interface to TeX
<a name="18. Interface to TeX"></a>
</h2>

TeX mode
is enabled by the &minus;t option. In TeX mode, pic
defines a vbox called \graph for each picture; the
name can be changed with the pseudo-variable figname
(which is actually a specially parsed command). You must
yourself print that vbox using, for example, the
command

\centerline{\box\graph}

Actually,
since the vbox has a height of zero (it is defined with
\vtop) this produces slightly more vertical space above the
picture than below it;

\centerline{\raise
1em\box\graph}

would
avoid this.

To make
the vbox having a positive height and a depth of zero (as
used e.g. by LaTeX&rsquo;s graphics.sty), define the
following macro in your document:

\def\gpicbox#1{%
 
\vbox{\unvbox\csname #1\endcsname\kern 0pt}}

Now you
can simply say \gpicbox{graph} instead of
\box\graph.

You must
use a TeX driver that supports the tpic specials,
version&nbsp;2.

Lines
beginning with \ are passed through transparently; a
% is added to the end of the line to avoid unwanted
spaces. You can safely use this feature to change fonts or
to change the value of \baselineskip. Anything else
may well produce undesirable results; use at your own risk.
Lines beginning with a period are not given any special
treatment.

The TeX
mode of pic(1) does not translate troff
font and size changes included in text strings!

Here an
example how to use figname.

.PS
 
figname = foo; 
... 
.PE

.PS
 
figname = bar; 
... 
.PE

\centerline{\box\foo
\hss \box\bar}

Use this
feature sparsingly and only if really needed: A different
name means a new box register in TeX, and the maximum number
of box registers is only 256. Also be careful not to use a
predefined TeX or LaTeX macro name as an argument to
figname since this inevitably causes an
error.
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