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Next: <a href="Macro-Package-Intro.html" accesskey="n" rel="next">Macro Packages</a>, Previous: <a href="What-Is-groff_003f.html" accesskey="p" rel="prev">What Is <code class="code">groff</code>?</a>, Up: <a href="Introduction.html" accesskey="u" rel="up">Introduction</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p>
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<h3 class="section" id="groff-Capabilities-1">1.3 <code class="code">groff</code> Capabilities</h3>
<a class="index-entry-id" id="index-groff-capabilities"></a>
<a class="index-entry-id" id="index-capabilities-of-groff"></a>
<p>GNU <code class="code">troff</code> is a typesetting document formatter; it provides a wide
range of low-level text and page operations within the framework of a
programming language. These operations compose to generate footnotes,
tables of contents, mathematical equations, diagrams, multi-column text,
and other elements of typeset works. Here is a survey of formatter
features; all are under precise user control.
</p>
<ul class="itemize mark-bullet">
<li>text filling, breaking, alignment to the left or right margin; centering
</li><li>adjustment of inter-word space size to justify text, and of
inter-sentence space size to suit local style conventions
</li><li>automatic and manual determination of hyphenation break points
</li><li>pagination
</li><li>selection of any font available to the output device
</li><li>adjustment of type size and vertical spacing (or “leading”)
</li><li>configuration of line length and indentation amounts; columnation
</li><li>drawing of geometric primitives (lines, arcs, polygons, circles,
…)
</li><li>setup of stroke and fill colors (where supported by the output
device)
</li><li>embedding of hyperlinks, images, document metadata, and other inclusions
(where supported by the output device)
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