diff options
Diffstat (limited to '')
| -rw-r--r-- | doc/groff.html.node/Graphics-Commands.html | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/doc/groff.html.node/Graphics-Commands.html b/doc/groff.html.node/Graphics-Commands.html new file mode 100644 index 0000000..87a856c --- /dev/null +++ b/doc/groff.html.node/Graphics-Commands.html @@ -0,0 +1,247 @@ +<!DOCTYPE html> +<html> +<!-- Created by GNU Texinfo 7.0.3, https://www.gnu.org/software/texinfo/ --> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<!-- This manual documents GNU troff version 1.23.0. + +Copyright © 1994-2023 Free Software Foundation, Inc. + +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, no Front-Cover Texts, and no Back-Cover Texts. A +copy of the license is included in the section entitled "GNU Free +Documentation License". --> +<title>Graphics Commands (The GNU Troff Manual)</title> + +<meta name="description" content="Graphics Commands (The GNU Troff Manual)"> +<meta name="keywords" content="Graphics Commands (The GNU Troff Manual)"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta name="viewport" content="width=device-width,initial-scale=1"> + +<link href="index.html" rel="start" title="Top"> +<link href="Request-Index.html" rel="index" title="Request Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Command-Reference.html" rel="up" title="Command Reference"> +<link href="Device-Control-Commands.html" rel="next" title="Device Control Commands"> +<link href="Simple-Commands.html" rel="prev" title="Simple Commands"> +<style type="text/css"> +<!-- +div.example {margin-left: 3.2em} +span.r {font-family: initial; font-weight: normal; font-style: normal} +--> +</style> + + +</head> + +<body lang="en"> +<div class="subsubsection-level-extent" id="Graphics-Commands"> +<div class="nav-panel"> +<p> +Next: <a href="Device-Control-Commands.html" accesskey="n" rel="next">Device Control Commands</a>, Previous: <a href="Simple-Commands.html" accesskey="p" rel="prev">Simple Commands</a>, Up: <a href="Command-Reference.html" accesskey="u" rel="up">Command Reference</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> +</div> +<hr> +<h4 class="subsubsection" id="Graphics-Commands-1">6.1.2.3 Graphics Commands</h4> + +<p>Each graphics or drawing command in the intermediate output starts with +the letter ‘<samp class="samp">D</samp>’, followed by one or two characters that specify a +subcommand; this is followed by a fixed or variable number of integer +arguments that are separated by a single space character. A ‘<samp class="samp">D</samp>’ +command may not be followed by another command on the same line (apart +from a comment), so each ‘<samp class="samp">D</samp>’ command is terminated by a syntactical +line break. +</p> +<p><code class="code">gtroff</code> output follows the classical spacing rules (no space +between command and subcommand, all arguments are preceded by a single +space character), but the parser allows optional space between the +command letters and makes the space before the first argument optional. +As usual, each space can be any sequence of tab and space characters. +</p> +<p>Some graphics commands can take a variable number of arguments. In this +case, they are integers representing a size measured in basic units +‘<samp class="samp">u</samp>’. The arguments called <var class="var">h1</var>, <var class="var">h2</var>, …, <var class="var">hn</var> +stand for horizontal distances where positive means right, negative +left. The arguments called <var class="var">v1</var>, <var class="var">v2</var>, …, <var class="var">vn</var> stand +for vertical distances where positive means down, negative up. All +these distances are offsets relative to the current location. +</p> +<p>Each graphics command directly corresponds to a similar <code class="code">gtroff</code> +<code class="code">\D</code> escape sequence. See <a class="xref" href="Drawing-Geometric-Objects.html">Drawing Geometric Objects</a>. +</p> +<p>Unknown ‘<samp class="samp">D</samp>’ commands are assumed to be device-specific. Its +arguments are parsed as strings; the whole information is then sent to +the postprocessor. +</p> +<p>In the following command reference, the syntax element ‹<span class="r">line +break</span>› means a syntactical line break as defined above. +</p> +<dl class="table"> +<dt><code class="code">D~ <var class="var">h1</var> <var class="var">v1</var> <var class="var">h2</var> <var class="var">v2</var> … <var class="var">hn</var> <var class="var">vn</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw B-spline from current position to offset (<var class="var">h1</var>,<var class="var">v1</var>), then +to offset (<var class="var">h2</var>,<var class="var">v2</var>), if given, etc., up to +(<var class="var">hn</var>,<var class="var">vn</var>). This command takes a variable number of argument +pairs; the current position is moved to the terminal point of the drawn +curve. +</p> +</dd> +<dt><code class="code">Da <var class="var">h1</var> <var class="var">v1</var> <var class="var">h2</var> <var class="var">v2</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw arc from current position to +(<var class="var">h1</var>,<var class="var">v1</var>)<em class="math">+</em>(<var class="var">h2</var>,<var class="var">v2</var>) with center at +(<var class="var">h1</var>,<var class="var">v1</var>); then move the current position to the final point +of the arc. +</p> +</dd> +<dt><code class="code">DC <var class="var">d</var>‹<span class="r">line break</span>›</code></dt> +<dt><code class="code">DC <var class="var">d</var> <var class="var">dummy-arg</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw a solid circle using the current fill color with +diameter <var class="var">d</var> (integer in basic units ‘<samp class="samp">u</samp>’) with leftmost +point at the current position; then move the current position to the +rightmost point of the circle. An optional second integer argument is +ignored (this allows the formatter to generate an even number of +arguments). This command is a <code class="code">gtroff</code> extension. +</p> +</dd> +<dt><code class="code">Dc <var class="var">d</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw circle line with diameter <var class="var">d</var> (integer in basic units +‘<samp class="samp">u</samp>’) with leftmost point at the current position; then move the +current position to the rightmost point of the circle. +</p> +</dd> +<dt><code class="code">DE <var class="var">h</var> <var class="var">v</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw a solid ellipse in the current fill color with a horizontal +diameter of <var class="var">h</var> and a vertical diameter of <var class="var">v</var> (both +integers in basic units ‘<samp class="samp">u</samp>’) with the leftmost point at the current +position; then move to the rightmost point of the ellipse. This command +is a <code class="code">gtroff</code> extension. +</p> +</dd> +<dt><code class="code">De <var class="var">h</var> <var class="var">v</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw an outlined ellipse with a horizontal diameter of <var class="var">h</var> and +a vertical diameter of <var class="var">v</var> (both integers in basic units +‘<samp class="samp">u</samp>’) with the leftmost point at current position; then move to the +rightmost point of the ellipse. +</p> +</dd> +<dt><code class="code">DF <var class="var">color-scheme</var> <span class="r">[</span><var class="var">component</var> …<span class="r">]</span>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects using different color schemes; +the analogous command for setting the color of text, line graphics, and +the outline of graphic objects is ‘<samp class="samp">m</samp>’. The color components are +specified as integer arguments between 0 and 65535. The number of color +components and their meaning vary for the different color schemes. +These commands are generated by <code class="code">gtroff</code>’s escape sequences +‘<samp class="samp">\D'F …'</samp>’ and <code class="code">\M</code> (with no other corresponding +graphics commands). No position changing. This command is a +<code class="code">gtroff</code> extension. +</p> +<dl class="table"> +<dt><code class="code">DFc <var class="var">cyan</var> <var class="var">magenta</var> <var class="var">yellow</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects using the CMY color scheme, +having the 3 color components <var class="var">cyan</var>, <var class="var">magenta</var>, and +<var class="var">yellow</var>. +</p> +</dd> +<dt><code class="code">DFd‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects to the default fill color value +(black in most cases). No component arguments. +</p> +</dd> +<dt><code class="code">DFg <var class="var">gray</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects to the shade of gray given by +the argument, an integer between 0 (black) and 65535 (white). +</p> +</dd> +<dt><code class="code">DFk <var class="var">cyan</var> <var class="var">magenta</var> <var class="var">yellow</var> <var class="var">black</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects using the CMYK color scheme, +having the 4 color components <var class="var">cyan</var>, <var class="var">magenta</var>, +<var class="var">yellow</var>, and <var class="var">black</var>. +</p> +</dd> +<dt><code class="code">DFr <var class="var">red</var> <var class="var">green</var> <var class="var">blue</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set fill color for solid drawing objects using the RGB color scheme, +having the 3 color components <var class="var">red</var>, <var class="var">green</var>, and +<var class="var">blue</var>. +</p></dd> +</dl> + +</dd> +<dt><code class="code">Df <var class="var">n</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>The argument <var class="var">n</var> must be an integer in the range <em class="math">-32767</em> +to 32767. +</p> +<dl class="table"> +<dt><em class="math">0 ≤ <var class="var">n</var> ≤ 1000</em></dt> +<dd><p>Set the color for filling solid drawing objects to a shade of gray, +where 0 corresponds to solid white, 1000 (the default) to solid black, +and values in between to intermediate shades of gray; this is obsoleted +by command ‘<samp class="samp">DFg</samp>’. +</p> +</dd> +<dt><em class="math"><var class="var">n</var> < 0</em> or <em class="math"><var class="var">n</var> > 1000</em></dt> +<dd><p>Set the filling color to the color that is currently being used for the +text and the outline, see command ‘<samp class="samp">m</samp>’. For example, the command +sequence +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">mg 0 0 65535 +Df -1 +</pre></div></div> + +<p>sets all colors to blue. +</p></dd> +</dl> + +<p>No position changing. This command is a <code class="code">gtroff</code> extension. +</p> +</dd> +<dt><code class="code">Dl <var class="var">h</var> <var class="var">v</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw line from current position to offset (<var class="var">h</var>,<var class="var">v</var>) (integers in +basic units ‘<samp class="samp">u</samp>’); then set current position to the end of the drawn +line. +</p> +</dd> +<dt><code class="code">Dp <var class="var">h1</var> <var class="var">v1</var> <var class="var">h2</var> <var class="var">v2</var> … <var class="var">hn</var> <var class="var">vn</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw a polygon line from current position to offset (<var class="var">h1</var>,<var class="var">v1</var>), +from there to offset (<var class="var">h2</var>,<var class="var">v2</var>), etc., up to offset +(<var class="var">hn</var>,<var class="var">vn</var>), and from there back to the starting position. For +historical reasons, the position is changed by adding the sum of all +arguments with odd index to the actual horizontal position and the even +ones to the vertical position. Although this doesn’t make sense it is +kept for compatibility. +This command is a <code class="code">gtroff</code> extension. +</p> +</dd> +<dt><code class="code">DP <var class="var">h1</var> <var class="var">v1</var> <var class="var">h2</var> <var class="var">v2</var> … <var class="var">hn</var> <var class="var">vn</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Draw a solid polygon in the current fill color rather than an outlined +polygon, using the same arguments and positioning as the corresponding +‘<samp class="samp">Dp</samp>’ command. +This command is a <code class="code">gtroff</code> extension. +</p> +</dd> +<dt><code class="code">Dt <var class="var">n</var>‹<span class="r">line break</span>›</code></dt> +<dd><p>Set the current line thickness to <var class="var">n</var> (an integer in basic +units ‘<samp class="samp">u</samp>’) if <em class="math"><var class="var">n</var>>0</em>; if <em class="math"><var class="var">n</var>=0</em> select the +smallest available line thickness; if <em class="math"><var class="var">n</var><0</em> set the line +thickness proportional to the type size (this is the default before the +first ‘<samp class="samp">Dt</samp>’ command was specified). For historical reasons, the +horizontal position is changed by adding the argument to the actual +horizontal position, while the vertical position is not changed. +Although this doesn’t make sense it is kept for compatibility. +This command is a <code class="code">gtroff</code> extension. +</p></dd> +</dl> + +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="Device-Control-Commands.html">Device Control Commands</a>, Previous: <a href="Simple-Commands.html">Simple Commands</a>, Up: <a href="Command-Reference.html">Command Reference</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> +</div> + + + +</body> +</html> |