diff options
Diffstat (limited to 'doc/groff.html.node/Colors.html')
| -rw-r--r-- | doc/groff.html.node/Colors.html | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/doc/groff.html.node/Colors.html b/doc/groff.html.node/Colors.html new file mode 100644 index 0000000..8c23dcb --- /dev/null +++ b/doc/groff.html.node/Colors.html @@ -0,0 +1,208 @@ +<!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>Colors (The GNU Troff Manual)</title> + +<meta name="description" content="Colors (The GNU Troff Manual)"> +<meta name="keywords" content="Colors (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="GNU-troff-Reference.html" rel="up" title="GNU troff Reference"> +<link href="Strings.html" rel="next" title="Strings"> +<link href="Manipulating-Type-Size-and-Vertical-Spacing.html" rel="prev" title="Manipulating Type Size and Vertical Spacing"> +<style type="text/css"> +<!-- +a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} +div.example {margin-left: 3.2em} +span.r {font-family: initial; font-weight: normal; font-style: normal} +span:hover a.copiable-link {visibility: visible} +strong.def-name {font-family: monospace; font-weight: bold; font-size: larger} +--> +</style> + + +</head> + +<body lang="en"> +<div class="section-level-extent" id="Colors"> +<div class="nav-panel"> +<p> +Next: <a href="Strings.html" accesskey="n" rel="next">Strings</a>, Previous: <a href="Manipulating-Type-Size-and-Vertical-Spacing.html" accesskey="p" rel="prev">Manipulating Type Size and Vertical Spacing</a>, Up: <a href="GNU-troff-Reference.html" accesskey="u" rel="up">GNU <code class="code">troff</code> 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> +<h3 class="section" id="Colors-1">5.21 Colors</h3> +<a class="index-entry-id" id="index-colors"></a> + +<a class="index-entry-id" id="index-stroke-color"></a> +<a class="index-entry-id" id="index-color_002c-stroke"></a> +<a class="index-entry-id" id="index-fill-color"></a> +<a class="index-entry-id" id="index-color_002c-fill"></a> +<p>GNU <code class="code">troff</code> supports color output with a variety of color spaces +and up to 16 bits per channel. Some devices, particularly terminals, +may be more limited. When color support is enabled, two colors are +current at any given time: the <em class="dfn">stroke color</em>, with which glyphs, +rules (lines), and geometric objects like circles and polygons are +drawn, and the <em class="dfn">fill color</em>, which can be used to paint the interior +of a closed geometric figure. +</p> +<dl class="first-deffn"> +<dt class="deffn" id="index-_002ecolor"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.color</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">n</i></span>]</var><a class="copiable-link" href='#index-_002ecolor'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-color"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002ecolor_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.color]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002ecolor_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002ecolor-1"></a> +<p>If <var class="var">n</var> is missing or non-zero, enable the output of color-related +device-independent output commands (this is the default); otherwise, +disable them. This request sets a global flag; it does not produce an +input token (see <a class="pxref" href="Gtroff-Internals.html"><code class="code">gtroff</code> Internals</a>). +</p> +<p>The read-only register <code class="code">.color</code> is 1 if colors are enabled, +0 otherwise. +</p> +<p>Color can also be disabled with the <samp class="option">-c</samp> command-line option. +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002edefcolor"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.defcolor</code></strong> <var class="def-var-arguments">ident scheme color-component …</var><a class="copiable-link" href='#index-_002edefcolor'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-defcolor"></a> +<p>Define a color named <var class="var">ident</var>. <var class="var">scheme</var> selects a color space +and determines the quantity of required <var class="var">color-component</var>s; it must +be one of ‘<samp class="samp">rgb</samp>’ (three components), ‘<samp class="samp">cmy</samp>’ (three), ‘<samp class="samp">cmyk</samp>’ +(four), or ‘<samp class="samp">gray</samp>’ (one). ‘<samp class="samp">grey</samp>’ is accepted as a synonym of +‘<samp class="samp">gray</samp>’. The color components can be encoded as a single +hexadecimal value starting with ‘<samp class="samp">#</samp>’ or ‘<samp class="samp">##</samp>’. The former +indicates that each component is in the range 0–255 (0–FF), the latter +the range 0–65,535 (0–FFFF). +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.defcolor half gray #7f +.defcolor pink rgb #FFC0CB +.defcolor magenta rgb ##ffff0000ffff +</pre></div></div> + +<a class="index-entry-id" id="index-f-scaling-unit"></a> +<a class="index-entry-id" id="index-unit_002c-scaling_002c-f"></a> +<a class="index-entry-id" id="index-scaling-unit-f"></a> +<p>Alternatively, each color component can be specified as a decimal +fraction in the range 0–1, interpreted using a default scaling +unit of <code class="code">f</code>, which multiplies its value by 65,536 (but +clamps it at 65,535). +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.defcolor gray50 rgb 0.5 0.5 0.5 +.defcolor darkgreen rgb 0.1f 0.5f 0.2f +</pre></div></div> +</dd></dl> + +<a class="index-entry-id" id="index-default-color"></a> +<a class="index-entry-id" id="index-color_002c-default"></a> +<p>Each output device has a color named ‘<samp class="samp">default</samp>’, which cannot be +redefined. A device’s default stroke and fill colors are not +necessarily the same. For the <code class="code">dvi</code>, <code class="code">html</code>, <code class="code">pdf</code>, +<code class="code">ps</code>, and <code class="code">xhtml</code> output devices, GNU <code class="code">troff</code> +automatically loads a macro file defining many color names at startup. +By the same mechanism, the devices supported by <code class="code">grotty</code> recognize +the eight standard ISO 6429/EMCA-48 color names.<a class="footnote" id="DOCF86" href="groff.html_fot.html#FOOT86"><sup>86</sup></a> +</p> +<dl class="first-deffn"> +<dt class="deffn" id="index-_002egcolor"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.gcolor</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">color</i></span>]</var><a class="copiable-link" href='#index-_002egcolor'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-gcolor"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cmc"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\m</code><span class="r"><i class="slanted">c</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cmc'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_005cm"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cm_0028co"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\m(</code><span class="r"><i class="slanted">co</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cm_0028co'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cm_005bcolor_005d"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\m[</code><span class="r"><i class="slanted">color</i></span><code class="t">]</code></strong><a class="copiable-link" href='#index-_005cm_005bcolor_005d'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002em_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.m]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002em_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002em"></a> +<p>Set the stroke color to <var class="var">color</var>. +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.gcolor red +The next words +.gcolor +\m[red]are in red\m[] +and these words are in the previous color. +</pre></div></div> + +<p>The escape sequence <code class="code">\m[]</code> restores the previous stroke color, as +does a <code class="code">gcolor</code> request without an argument. +</p> +<a class="index-entry-id" id="index-stroke-color-name-register-_0028_002em_0029"></a> +<a class="index-entry-id" id="index-name_002c-stroke-color_002c-register-_0028_002em_0029"></a> +<a class="index-entry-id" id="index-color-name_002c-stroke_002c-register-_0028_002em_0029"></a> +<p>The name of the current stroke color is available in the read-only +string-valued register ‘<samp class="samp">.m</samp>’; it is associated with the environment +(see <a class="pxref" href="Environments.html">Environments</a>). It interpolates nothing when the stroke color +is the default. +</p> +<p><code class="code">\m</code> doesn’t produce an input token in GNU <code class="code">troff</code> +(see <a class="pxref" href="Gtroff-Internals.html"><code class="code">gtroff</code> Internals</a>). It therefore can be used in requests like +<code class="code">mc</code> (which expects a single character as an argument) to change +the color on the fly: +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.mc \m[red]x\m[] +</pre></div></div> +</dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002efcolor"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.fcolor</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">color</i></span>]</var><a class="copiable-link" href='#index-_002efcolor'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-fcolor"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cMc"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\M</code><span class="r"><i class="slanted">c</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cMc'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_005cM"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cM_0028co"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\M(</code><span class="r"><i class="slanted">co</i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cM_0028co'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cM_005bcolor_005d"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\M[</code><span class="r"><i class="slanted">color</i></span><code class="t">]</code></strong><a class="copiable-link" href='#index-_005cM_005bcolor_005d'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eM_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.M]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eM_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002eM"></a> +<p>Set the fill color for objects drawn with <code class="code">\D'…'</code> escape +sequences. The escape sequence <code class="code">\M[]</code> restores the previous fill +color, as does an <code class="code">fcolor</code> request without an argument. +</p> +<a class="index-entry-id" id="index-background-color-name-register-_0028_002eM_0029"></a> +<a class="index-entry-id" id="index-name_002c-background-color_002c-register-_0028_002eM_0029"></a> +<a class="index-entry-id" id="index-color-name_002c-background_002c-register-_0028_002eM_0029"></a> +<a class="index-entry-id" id="index-fill-color-name-register-_0028_002eM_0029"></a> +<a class="index-entry-id" id="index-name_002c-fill-color_002c-register-_0028_002eM_0029"></a> +<a class="index-entry-id" id="index-color-name_002c-fill_002c-register-_0028_002eM_0029"></a> +<p>The name of the current fill color is available in the read-only +string-valued register ‘<samp class="samp">.M</samp>’; it is associated with the environment +(see <a class="pxref" href="Environments.html">Environments</a>). It interpolates nothing when the fill color +is the default. <code class="code">\M</code> doesn’t produce an input token in GNU +<code class="code">troff</code>. +</p> +<p>Create an ellipse with a red interior as follows. +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">\M[red]\h'0.5i'\D'E 2i 1i'\M[] +</pre></div></div> +</dd></dl> + + + +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="Strings.html">Strings</a>, Previous: <a href="Manipulating-Type-Size-and-Vertical-Spacing.html">Manipulating Type Size and Vertical Spacing</a>, Up: <a href="GNU-troff-Reference.html">GNU <code class="code">troff</code> 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> |