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<title>Motion Quanta (The GNU Troff Manual)</title>
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<div class="subsection-level-extent" id="Motion-Quanta">
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<h4 class="subsection" id="Motion-Quanta-1">5.3.1 Motion Quanta</h4>
<a class="index-entry-id" id="index-motion-quanta"></a>
<a class="index-entry-id" id="index-quanta_002c-motion"></a>
<p>An output device’s basic unit <code class="code">u</code> is not necessarily its smallest
addressable length; <code class="code">u</code> can be smaller to avoid problems with
integer roundoff. The minimum distances that a device can work with in
the horizontal and vertical directions are termed its <em class="dfn">motion
quanta</em>. Measurements are rounded to applicable motion quanta.
Half-quantum fractions round toward zero.
</p>
<a class="index-entry-id" id="index-horizontal-motion-quantum-register-_0028_002eH_0029"></a>
<a class="index-entry-id" id="index-motion-quantum_002c-horizontal_002c-register-_0028_002eH_0029"></a>
<a class="index-entry-id" id="index-horizontal-resolution-register-_0028_002eH_0029"></a>
<a class="index-entry-id" id="index-resolution_002c-horizontal_002c-register-_0028_002eH_0029"></a>
<dl class="first-deffn">
<dt class="deffn" id="index-_005cn_005b_002eH_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.H]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eH_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_002eH"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eV_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.V]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eV_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_002eV"></a>
<p>These read-only registers interpolate the horizontal and vertical motion
quanta, respectively, of the output device in basic units.
</p></dd></dl>
<p>For example, we might draw short baseline rules on a terminal device as
follows. See <a class="xref" href="Drawing-Geometric-Objects.html">Drawing Geometric Objects</a>.
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">.tm \n[.H]
error→ 24
.nf
\l'36u' 36u
\l'37u' 37u
⇒ _ 36u
⇒ __ 37u
</pre></div></div>
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