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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+This file is part of groff, the GNU roff type-setting system.
+
+Copyright (C) 2004-2020 Free Software Foundation, Inc.
+Written by Peter Schaffter (peter@schaffter.ca).
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
+Texts.
+
+A copy of the Free Documentation License is included as a file called
+FDL in the main directory of the groff source package.
+-->
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>
+ <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
+ <title>Mom -- Graphical Objects</title>
+ <link rel="stylesheet" type="text/css" href="stylesheet.css" />
+</head>
+
+<body style="background-color: #f5faff;">
+
+<!-- ==================================================================== -->
+
+<div id="top" class="page">
+
+<!-- Navigation links -->
+<table style="width: 100%;">
+<tr>
+ <td><a href="toc.html">Back to Table of Contents</a></td>
+ <td style="text-align: right;"><a href="docprocessing.html#top">Next: Document processing</a></td>
+</tr>
+</table>
+
+<h1 class="docs">Graphical objects</h1>
+
+<div style="text-align: center;">
+<ul class="no-enumerator" style="margin-left: -2.5em;">
+ <li><a href="#intro-graphical">Introduction to graphical objects</a></li>
+ <li><a href="#behaviour">Graphical objects behaviour</a></li>
+ <li><a href="#order">Order of arguments</a></li>
+ <li><a href="#index-graphical">Index of graphical objects macros</a></li>
+</ul>
+</div>
+
+<div class="rule-medium"><hr/></div>
+
+<h2 id="intro-graphical" class="docs">Introduction to graphical objects</h2>
+
+<p>
+Groff has a number of
+<a href="definitions.html#inlines">inline escapes</a>
+for drawing rules, polygons, ellipses and splines. All begin with
+<kbd>\D</kbd> (presumably for &#8220;Draw&#8221;) and are documented
+in the groff info manual:
+<br/>
+<span class="pre-in-pp">
+ info groff \D
+</span>
+The escapes allow you to draw just about any simple graphical object
+you can think of, but owing to their syntax they&#8217;re not always easy
+to read, which can make tweaking them difficult. Additionally,
+while they perform in a <i>consistent</i> manner, they don&#8217;t
+always perform in an <i>expected</i> manner.
+</p>
+
+<p>
+Experience shows that the most common graphical elements typesetters
+need are rules (horizontal and vertical), boxes, and circles (or
+ellipses). For this reason, mom provides macros
+to draw these objects in an easy-to-understand way; the results are
+predictable, and mom&#8217;s syntax makes fixes or tweaks
+painless.
+</p>
+
+<p id="graphical-example">
+For example, if you want to draw a 2-inch square outline box at the left
+margin using groff&#8217;s <kbd>\D</kbd> escapes, it looks like this:
+<br/>
+<span class="pre-in-pp">
+ back up
+ by
+ weight
+ +-------+
+ | |
+ \D't 500'\h'-500u'\D'p 2i 0 0 2i -2i 0 0 -2i'
+ | | | |
+ +-------+ +------------------------+
+ set rule draw box, 1 line at a time
+ weight
+</span>
+
+Obviously, this isn&#8217;t very efficient for something as simple as a
+box.
+</p>
+
+<p>
+Here&#8217;s the same box, drawn with mom&#8217;s box drawing
+macro
+<kbd><a href="#dbx">DBX</a></kbd>:
+<br/>
+<span class="pre-in-pp">
+ left margin indent--+ +--box width
+ | |
+ .DBX .5 0 2i 2i
+ | |
+ rule weight--+ +--box depth
+ (in points)
+</span>
+</p>
+
+<p>
+Mom&#8217;s graphical object macros allow&mdash;in fact,
+require&mdash;giving the rule weight (&#8220;thickness&#8221;) for
+the object (or saying that you want it filled), an indent from the
+left margin where the object begins, the dimensions of the object,
+and optionally a colour for the object.
+</p>
+
+<p>
+There are no defaults for the arguments to mom&#8217;s graphical
+object macros, which means you must supply the arguments every time
+you invoke them.
+</p>
+
+<div class="box-tip">
+<p class="tip">
+<span class="note">Note:</span>
+As stated above, mom only provides macros for commonly-used
+graphical objects (rules, boxes, circles). More complex objects
+(polygons, non-straight lines, splines) must be drawn using
+groff&#8217;s <kbd>\D</kbd> escapes.
+</p>
+</div>
+
+<h3 id="behaviour" class="docs">Graphical object behaviour</h3>
+
+<p>
+Mom&#8217;s graphical object macros all behave in the following,
+carved-in-stone ways:
+</p>
+<ol style="margin-top: -.5em; margin-bottom: -.5em;">
+ <li>Objects are drawn from the
+ <a href="definitions.html#baseline">baseline</a>
+ down, including horizontal rules.</li>
+ <li>Objects begin precisely at the left indent supplied as
+ an argument to the macro.</li>
+ <li>Objects are drawn from left to right.</li>
+ <li>Enclosed objects (boxes, circles) are drawn from the
+ perimeter <i>inward</i>.</li>
+ <li>Objects return to their horizontal/vertical point of origin.</li>
+</ol>
+
+<p>
+The consistency means that once you&#8217;ve mastered the very
+simple order of arguments that applies to invoking graphical
+object macros, you can draw objects with full confidence that you
+know exactly where they&#8217;re placed and how much room they
+occupy. Furthermore, because all return to their point of origin,
+you&#8217;ll know exactly where you are on the page.
+</p>
+
+<h3 id="order" class="docs">Order of arguments</h3>
+
+<p>
+The order of arguments to the graphical object macros is the same
+for every macro:
+</p>
+<ul style="margin-top: -.5em; margin-bottom: -.5em;">
+ <li>the rule weight
+ <ul style="margin-left: -.75em;">
+ <li>the single word <kbd>SOLID</kbd> may be used in place
+ of <kbd>weight</kbd> if you want boxes or circles filled</li>
+ </ul></li>
+ <li>the indent from the current left margin at which to begin
+ the object
+ </li>
+ <li>the width of the object if applicable</li>
+ <li>the depth of the object if applicable</li>
+ <li>the colour of the object (optional)</li>
+</ul>
+
+<div class="macro-list-container">
+<h3 id="index-graphical" class="macro-list">Graphical objects macros</h3>
+
+<ul class="macro-list">
+ <li><a href="#drh">DRH</a>
+ &ndash; horizontal rules</li>
+ <li><a href="#drv">DRV</a>
+ &ndash; vertical rules</li>
+ <li><a href="#dbx">DBX</a>
+ &ndash; box</li>
+ <li><a href="#dcl">DCL</a>
+ &ndash; circles or ellipses</li>
+</ul>
+</div>
+
+<!-- -DRH- -->
+
+<div class="macro-id-overline">
+<h3 id="drh" class="macro-id">Drawing horizontal rules</h3>
+</div>
+
+<div class="box-macro-args">
+Macro: <b>DRH</b> <kbd class="macro-args">&lt;none&gt; | &lt;weight&gt; &lt;indent&gt; &lt;width&gt; [&lt;colour&gt;]</kbd>
+</div>
+
+<p class="requires">
+&bull;&nbsp;
+the argument to <kbd class="normal">&lt;weight&gt;</kbd> is in
+<a href="definitions.html#picaspoints" class="normal">points</a>,
+but do <span class="normal">not</span> append the
+<a href="definitions.html#unitsofmeasure">unit of measure</a>,
+<kbd class="normal">p</kbd>
+<br/>
+&bull;&nbsp;
+<kbd class="normal">&lt;indent&gt;</kbd>
+and
+<kbd class="normal">&lt;width&gt;</kbd>
+require a unit of measure
+<br/>
+&bull;&nbsp;
+arithmetic expressions to
+<kbd class="normal">&lt;indent&gt;</kbd>
+and
+<kbd class="normal">&lt;width&gt;</kbd>
+must be surrounded by parentheses
+</p>
+
+<p>
+If all you want is to draw a rule from your current left
+margin to your current right margin (in other words, a &quot;full
+measure&quot; rule), you may invoke <kbd>.DRH</kbd> without any
+arguments.
+</p>
+<div class="box-tip">
+<p class="tip">
+<span class="note">Note:</span>
+DRH is the only graphical object macro that may be invoked
+without arguments. The weight (&#8220;thickness&#8221;) of
+the rule is determined by the argument you last gave the
+macro
+<a href="inlines.html#rule-weight">RULE_WEIGHT</a>.
+DRH, used this way, is exactly equivalent to entering the
+<a href="definitions.html#inlines">inline escape</a>
+<a href="inlines.html#inline-rule-mom"><kbd><span class="nobr">\*[RULE]</span></kbd></a>.
+</p>
+</div>
+
+<p style="margin-top: -.5em;">
+To draw horizontal rules of a specified width, you must, at
+a minimum, supply DRH with the arguments <kbd>weight,</kbd>
+<kbd>indent</kbd> (measured from the current left margin) and
+<kbd>width</kbd>.
+</p>
+
+<p>
+Optionally, you may give a <kbd>color</kbd> argument. The colour
+may be either one defined with
+<a href="color.html#newcolor">NEWCOLOR</a>,
+or a named X-color initialized with
+<a href="color.html#xcolor">XCOLOR</a>,
+or an X-color alias (again, initialized with XCOLOR).
+</p>
+
+<p>
+Say, for example, you want to draw a 1-1/4 point horizontal rule
+that starts 2 picas from the current left margin and runs for 3
+inches. To do so, you&#8217;d invoke <kbd>.DRH</kbd> like this:
+<br/>
+<span class="pre-in-pp">
+ weight width
+ | |
+ .DRH 1.25 2P 3i
+ |
+ indent
+</span>
+(Note that the rule weight argument, which is expressed in points,
+must not have the unit of measure <kbd>p</kbd> appended to it.)
+</p>
+
+<p>
+If, in addition, you want the rule blue:
+<br/>
+<span class="pre-in-pp">
+ .DRH 1.25 2P 3i blue
+</span>
+</p>
+
+<h3 class="docs">How mom handles the positioning of horizontal rules</h3>
+
+<p>
+Horizontal rules are drawn from left to right, and from the baseline
+down. &#8220;From the baseline down&#8221; means that if you request
+a rule with a weight of four points, the four points of rule fall
+entirely below the baseline.
+</p>
+
+<p>
+Furthermore, after the rule is drawn, mom returns you to the current
+left margin, at the same vertical position on the page as when DRH
+was invoked. In other words, DRH causes no movement on the page,
+either horizontal or vertical.
+</p>
+
+<!-- -DRV- -->
+
+<div class="macro-id-overline">
+<h3 id="drv" class="macro-id">Drawing vertical rules</h3>
+</div>
+
+<div class="box-macro-args">
+Macro: <b>DRV</b> <kbd class="macro-args">&lt;weight&gt; &lt;indent&gt; &lt;depth&gt; [&lt;colour&gt;]</kbd>
+</div>
+
+<p class="requires">
+&bull;&nbsp;
+the argument to <kbd class="normal">&lt;weight&gt;</kbd> is in
+<a href="definitions.html#picaspoints" class="normal">points</a>,
+but do <span class="normal">not</span> append the
+<a href="definitions.html#unitsofmeasure">unit of measure</a>,
+<kbd class="normal">p</kbd>
+<br/>
+&bull;&nbsp;
+<kbd class="normal">&lt;indent&gt;</kbd>
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+require a unit of measure
+<br/>
+&bull;&nbsp;
+arithmetic expressions to
+<kbd class="normal">&lt;indent&gt;</kbd>
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+must be surrounded by parentheses
+</p>
+
+<p>
+To draw vertical rules of a specified depth, you must, at
+a minimum, supply DRV with the arguments <kbd>weight,</kbd>
+<kbd>indent</kbd> (measured from the current left margin) and
+<kbd>depth</kbd>.
+</p>
+
+<p>
+Optionally, you may give a <kbd>color</kbd> argument. The colour
+may be either one defined with
+<a href="color.html#newcolor">NEWCOLOR</a>,
+or a named X-color initialized with
+<a href="color.html#xcolor">XCOLOR</a>,
+or an X-color alias (again, initialized with XCOLOR).
+</p>
+
+<p>
+Say, for example, you want to draw a 3/4-point vertical rule that
+starts 19-1/2 picas from the current left margin and has a depth of
+6 centimetres. To do so, you&#8217;d invoke <kbd>.DRV</kbd> like
+this:
+<br/>
+<span class="pre-in-pp">
+ weight depth
+ | |
+ .DRV .75 19P+6p 6c
+ |
+ indent
+</span>
+(Note that the rule weight argument, which is expressed in points,
+must not have the unit of measure <kbd>p</kbd> appended to it.)
+</p>
+
+<p>
+If, in addition, you want the rule red:
+<br/>
+<span class="pre-in-pp">
+ .DRV .75 19P+6p 6c red
+</span>
+</p>
+
+<h3 class="docs">How mom handles the positioning of vertical rules</h3>
+
+<p>
+Vertical rules are drawn from the baseline down, and from left to
+right. &quot;Left to right&quot; means that if you request a rule
+with a weight of four points, the four points of rule fall entirely
+to the right of the indent given to DRV.
+</p>
+
+<p>
+Furthermore, after the rule is drawn, mom returns you to the current
+left margin, at the same vertical position on the page as when DRV
+was invoked. In other words, DRV causes no movement on the page,
+either horizontal or vertical.
+</p>
+
+<!-- -DBX- -->
+
+<div class="macro-id-overline">
+<h3 id="dbx" class="macro-id">Drawing boxes</h3>
+</div>
+
+<div class="box-macro-args">
+Macro: <b>DBX</b> <kbd class="macro-args">&lt;weight&gt;|SOLID &lt;indent&gt; &lt;width&gt;|FULL_MEASURE &lt;depth&gt; [&lt;color&gt;]</kbd>
+</div>
+
+<p class="requires">
+&bull;&nbsp;
+the argument to <kbd class="normal">&lt;weight&gt;</kbd> is in
+<a href="definitions.html#picaspoints" class="normal">points</a>,
+but do <span class="normal">not</span> append the
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+<kbd class="normal">p</kbd>
+<br/>
+&bull;&nbsp;<kbd class="normal">&lt;indent&gt;</kbd>,
+<kbd class="normal">&lt;width&gt;</kbd>,
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+require a unit of measure
+<br/>
+&bull;&nbsp;
+arithmetic expressions to
+<kbd class="normal">&lt;indent&gt;</kbd>,
+<kbd class="normal">&lt;width&gt;</kbd>,
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+must be enclosed in parentheses.
+</p>
+
+<p>
+To draw boxes you must, at a minimum, supply DBX with the arguments
+<kbd>weight</kbd> or <kbd>SOLID</kbd>, <kbd>indent</kbd>,
+<kbd>width</kbd> or <kbd>FULL_MEASURE</kbd>, and <kbd>depth</kbd>.
+</p>
+
+<p>
+<kbd>weight</kbd> is the rule weight of outlined boxes, given in
+points but without the
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+<kbd>p</kbd> appended.
+</p>
+
+<p>
+If <kbd>SOLID</kbd> is given as the first argument, the box is
+filled rather than outlined and no <kbd>weight</kbd> argument should
+be supplied.
+</p>
+
+<p>
+<kbd>indent</kbd> is measured from the current left margin. If
+<kbd>FULL_MEASURE</kbd> is given, <kbd>indent</kbd> should be set to
+&#8220;0&#8221;.
+</p>
+
+<p>
+<kbd>width</kbd> is the width of the box with a
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+appended, caclculated from <kbd>indent</kbd> argument.
+</p>
+
+<p>
+If <kbd>FULL_MEASURE</kbd> is given instead of <kbd>width</kbd>,
+it circumvents having to calculate the width when left and/or right
+indents are in effect; mom draws the box from the current left
+margin to the current right margin. When no indents are in effect,
+<kbd>FULL_MEASURE</kbd> or <kbd>\n[.l]u</kbd>&#8212;the groff
+way of saying &#8220;the current line length&#8221;&#8212;have the
+same effect.
+</p>
+
+<p>
+Optionally, you may give a <kbd>color</kbd> argument. The colour
+may be either one defined with
+<a href="color.html#newcolor">NEWCOLOR</a>,
+or a named X-color initialized with
+<a href="color.html#xcolor">XCOLOR</a>,
+or an X-color alias (again, initialized with XCOLOR).
+</p>
+
+<p>
+Say, for example, you want to draw a 1/2 point outline box that
+starts one inch from the current left margin and has the dimensions
+12 picas x 6 picas. To do so, you&#8217;d invoke <kbd>.DBX</kbd>
+like this:
+<br/>
+<span class="pre-in-pp">
+ indent depth
+ | |
+ .DBX .5 1i 12P 6P
+ | |
+ weight width
+</span>
+(Note that the box weight argument, which is expressed in points,
+must not have the unit of measure <kbd>p</kbd> appended to it.)
+</p>
+
+<p>
+If you want the same box, but solid (&#8220;filled&#8221;) rather
+than drawn as an outline:
+<br/>
+<span class="pre-in-pp">
+ .DBX SOLID 1i 12P 6P
+</span>
+Additionally, if you want the box green:
+<br/>
+<span class="pre-in-pp">
+ .DBX .5 1i 12P 6P green
+</span>
+or
+<span class="pre-in-pp">
+ .DBX SOLID 1i 12P 6P green
+</span>
+</p>
+
+<h3 class="docs">How mom handles the positioning of boxes</h3>
+
+<p>
+Boxes are drawn from the baseline down, from left to right, and
+from the perimeter <i>inward</i>. &#8220;From the perimeter
+inward&#8221; means that if you request a box weight of six points,
+the 6-point rules used to draw the outline of the box fall entirely
+<i>within</i> the dimensions of the box.
+</p>
+
+<p>
+Furthermore, after the box is drawn, mom returns you to the current
+left margin, at the same vertical position on the page as when DBX
+was invoked. In other words, DBX causes no movement on the page,
+either horizontal or vertical.
+</p>
+
+<!-- -DCL- -->
+
+<div class="macro-id-overline">
+<h3 id="dcl" class="macro-id">Drawing circles (ellipses)</h3>
+</div>
+
+<div class="box-macro-args">
+Macro: <b>DCL</b> <kbd class="macro-args">&lt;weight&gt;|SOLID &lt;indent&gt; &lt;width&gt;|FULL_MEASURE &lt;depth&gt; [&lt;color&gt;]</kbd>
+</div>
+
+<p class="requires">
+&bull;&nbsp;
+the argument to <kbd class="normal">&lt;weight&gt;</kbd> is in
+<a href="definitions.html#picaspoints" class="normal">points</a>,
+but do <span class="normal">not</span> append the
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+<kbd class="normal">p</kbd>
+<br/>
+&bull;&nbsp;<kbd class="normal">&lt;indent&gt;</kbd>,
+<kbd class="normal">&lt;width&gt;</kbd>,
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+require a unit of measure
+<br/>
+&bull;&nbsp;
+arithmetic expressions to
+<kbd class="normal">&lt;indent&gt;</kbd>,
+<kbd class="normal">&lt;width&gt;</kbd>,
+and
+<kbd class="normal">&lt;depth&gt;</kbd>
+must be enclosed in parentheses.
+</p>
+
+<p>
+To draw circles you must, at a minimum, supply DCL with the arguments
+<kbd>weight</kbd> or <kbd>SOLID</kbd>, <kbd>indent</kbd>,
+<kbd>width</kbd> or <kbd>FULL_MEASURE</kbd>, and <kbd>depth</kbd>.
+</p>
+
+<p>
+<kbd>weight</kbd> is the rule weight of outlined circles, given in
+points but without the unit of measure
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+<kbd>p</kbd> appended.
+</p>
+
+<p>
+If <kbd>SOLID</kbd> is given as the first argument, the circle is
+filled rather than outlined and no <kbd>weight</kbd> argument should
+be supplied.
+</p>
+
+<p>
+<kbd>indent</kbd> is measured from the current left margin. If
+<kbd>FULL_MEASURE</kbd> is given, <kbd>indent</kbd> should be set to
+&#8220;0&#8221;.
+</p>
+
+<p>
+<kbd>width</kbd> is the width of the circle with a
+<a href="definitions.html#unitsofmeasure">unit of measure</a>
+appended, caclculated from <kbd>indent</kbd> argument.
+</p>
+
+<p>
+If <kbd>FULL_MEASURE</kbd> is given instead of <kbd>width</kbd>,
+it circumvents having to calculate the width when left and/or right
+indents are in effect; mom draws the circle from the current left
+margin to the current right margin. When no indents are in effect,
+<kbd>FULL_MEASURE</kbd> or <kbd>\n[.l]u</kbd>&#8212;the groff
+way of saying &#8220;the current line length&#8221;&#8212;have the
+same effect.
+</p>
+
+<p>
+Optionally, you may give a <kbd>color</kbd> argument. The colour
+may be either one defined with
+<a href="color.html#newcolor">NEWCOLOR</a>,
+or a named X-color initialized with
+<a href="color.html#xcolor">XCOLOR</a>,
+or an X-color alias (again, initialized with XCOLOR).
+</p>
+
+<p>
+Say, for example, you want to draw a 1/2 point outline circle that
+starts one inch from the current left margin and has the dimensions
+12 picas x 6 picas. To do so, you&#8217;d invoke <kbd>.DCL</kbd>
+like this:
+<br/>
+<span class="pre-in-pp">
+ indent depth
+ | |
+ .DCL .5 1i 12P 6P
+ | |
+ weight width
+</span>
+(Note that the circle weight argument, which is expressed in points,
+must not have the unit of measure <kbd>p</kbd> appended to it.)
+</p>
+
+<p>
+If you want the same circle, but solid (&#8220;filled&#8221;) rather
+than drawn as an outline:
+<br/>
+<span class="pre-in-pp">
+ .DCL SOLID 1i 12P 6P
+</span>
+Additionally, if you want the circle green:
+<br/>
+<span class="pre-in-pp">
+ .DCL .5 1i 12P 6P green
+</span>
+or
+<span class="pre-in-pp">
+ .DCL SOLID 1i 12P 6P green
+</span>
+</p>
+
+
+<h3 class="docs">How mom handles the positioning of circles (ellipses)</h3>
+
+<p>
+Circles (ellipses) are drawn from the baseline down, from left
+to right, and from the perimeter <i>inward</i>. &#8220;From the
+perimeter inward&#8221; means that if you request a circle weight of
+six points, the 6-point rule used to draw the outline of the circle
+or ellipse falls entirely <i>within</i> the dimensions of the
+circle or ellipse.
+</p>
+
+<p>
+Furthermore, after the circle is drawn, mom returns you to the
+current left margin, at the same vertical position on the page as
+when DCL was invoked. In other words, DCL causes no movement on the
+page, either horizontal or vertical.
+</p>
+
+<div class="rule-long"><hr/></div>
+
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