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diff --git a/doc/groff.html.node/Artificial-Fonts.html b/doc/groff.html.node/Artificial-Fonts.html new file mode 100644 index 0000000..6f9d43d --- /dev/null +++ b/doc/groff.html.node/Artificial-Fonts.html @@ -0,0 +1,252 @@ +<!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>Artificial Fonts (The GNU Troff Manual)</title> + +<meta name="description" content="Artificial Fonts (The GNU Troff Manual)"> +<meta name="keywords" content="Artificial Fonts (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="Using-Fonts.html" rel="up" title="Using Fonts"> +<link href="Ligatures-and-Kerning.html" rel="next" title="Ligatures and Kerning"> +<link href="Special-Fonts.html" rel="prev" title="Special Fonts"> +<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} +ul.mark-bullet {list-style-type: disc} +--> +</style> + + +</head> + +<body lang="en"> +<div class="subsection-level-extent" id="Artificial-Fonts"> +<div class="nav-panel"> +<p> +Next: <a href="Ligatures-and-Kerning.html" accesskey="n" rel="next">Ligatures and Kerning</a>, Previous: <a href="Special-Fonts.html" accesskey="p" rel="prev">Special Fonts</a>, Up: <a href="Using-Fonts.html" accesskey="u" rel="up">Using Fonts</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="subsection" id="Artificial-Fonts-1">5.19.7 Artificial Fonts</h4> +<a class="index-entry-id" id="index-artificial-fonts"></a> +<a class="index-entry-id" id="index-fonts_002c-artificial"></a> + +<p>There are a number of requests and escape sequences for artificially +creating fonts. These are largely vestiges of the days when output +devices did not have a wide variety of fonts, and when <code class="code">nroff</code> and +<code class="code">troff</code> were separate programs. Most of them are no longer +necessary in GNU <code class="code">troff</code>. Nevertheless, they are supported. +</p> +<dl class="first-deffn"> +<dt class="deffn" id="index-_005cH_0027height_0027"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\H<code class="code">'</code></code><span class="r"><i class="slanted">height</i></span><code class="t"><code class="code">'</code></code></strong><a class="copiable-link" href='#index-_005cH_0027height_0027'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_005cH"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cH_0027_002bheight_0027"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\H<code class="code">'</code></code><span class="r"><i class="slanted"><code class="t">+</code>height</i></span><code class="t"><code class="code">'</code></code></strong><a class="copiable-link" href='#index-_005cH_0027_002bheight_0027'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cH_0027_002dheight_0027"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\H<code class="code">'</code></code><span class="r"><i class="slanted"><code class="t">-</code>height</i></span><code class="t"><code class="code">'</code></code></strong><a class="copiable-link" href='#index-_005cH_0027_002dheight_0027'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eheight_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.height]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eheight_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002eheight"></a> +<a class="index-entry-id" id="index-changing-the-font-height-_0028_005cH_0029"></a> +<a class="index-entry-id" id="index-font-height_002c-changing-_0028_005cH_0029"></a> +<a class="index-entry-id" id="index-height_002c-font_002c-changing-_0028_005cH_0029"></a> +<p>Change (increment, decrement) the height of the current font, but not +the width. If <var class="var">height</var> is zero, restore the original height. +Default scaling unit is ‘<samp class="samp">z</samp>’. +</p> +<p>The read-only register <code class="code">.height</code> contains the font height as set by +<code class="code">\H</code>. +</p> +<p>Currently, only the <samp class="option">-Tps</samp> and <samp class="option">-Tpdf</samp> devices support +this feature. +</p> +<p><code class="code">\H</code> doesn’t produce an input token in GNU <code class="code">troff</code>. As a +consequence, it can be used in requests like <code class="code">mc</code> (which expects +a single character as an argument) to change the font on the fly: +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.mc \H'+5z'x\H'0' +</pre></div></div> + +<p>In compatibility mode, <code class="code">gtroff</code> behaves differently: If an +increment or decrement is used, it is always taken relative to the +current type size and not relative to the previously selected font +height. Thus, +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.cp 1 +\H'+5'test \H'+5'test +</pre></div></div> + +<p>prints the word ‘<samp class="samp">test</samp>’ twice with the same font height (five points +larger than the current font size). +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_005cS_0027slant_0027"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\S<code class="code">'</code></code><span class="r"><i class="slanted">slant</i></span><code class="t"><code class="code">'</code></code></strong><a class="copiable-link" href='#index-_005cS_0027slant_0027'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_005cS"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eslant_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.slant]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eslant_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002eslant"></a> +<a class="index-entry-id" id="index-changing-the-font-slant-_0028_005cS_0029"></a> +<a class="index-entry-id" id="index-font-slant_002c-changing-_0028_005cS_0029"></a> +<a class="index-entry-id" id="index-slant_002c-font_002c-changing-_0028_005cS_0029"></a> +<p>Slant the current font by <var class="var">slant</var> degrees. Positive values slant to +the right. Only integer values are possible. +</p> +<p>The read-only register <code class="code">.slant</code> contains the font slant as set by +<code class="code">\S</code>. +</p> +<p>Currently, only the <samp class="option">-Tps</samp> and <samp class="option">-Tpdf</samp> devices support +this feature. +</p> +<p><code class="code">\S</code> doesn’t produce an input token in GNU <code class="code">troff</code>. As a +consequence, it can be used in requests like <code class="code">mc</code> (which expects +a single character as an argument) to change the font on the fly: +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.mc \S'20'x\S'0' +</pre></div></div> + +<a class="index-entry-id" id="index-CSTR-_002354-errata-3"></a> +<a class="index-entry-id" id="index-CSTR-_002354-erratum_002c-_005cS-escape"></a> +<p>This escape is incorrectly documented in the <abbr class="acronym">AT&T</abbr> +<code class="code">troff</code> manual; the slant is always set to an absolute value. +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002eul"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.ul</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">lines</i></span>]</var><a class="copiable-link" href='#index-_002eul'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-ul"></a> +<a class="index-entry-id" id="index-underlining-_0028ul_0029"></a> +<p>The <code class="code">ul</code> request normally underlines subsequent lines if a TTY +output device is used. Otherwise, the lines are printed in italics +(only the term ‘underlined’ is used in the following). The single +argument is the quantity of input lines to be underlined; with no +argument, the next line is underlined. If <var class="var">lines</var> is zero or +negative, stop the effects of <code class="code">ul</code> (if it was active). Requests +and empty lines do not count for computing the number of underlined +input lines, even if they produce some output like <code class="code">tl</code>. Lines +inserted by macros (e.g., invoked by a trap) do count. +</p> +<p>At the beginning of <code class="code">ul</code>, the current font is stored and the +underline font is activated. Within the span of a <code class="code">ul</code> request, it +is possible to change fonts, but after the last line affected by +<code class="code">ul</code> the saved font is restored. +</p> +<p>This number of lines still to be underlined is associated with the +environment (see <a class="pxref" href="Environments.html">Environments</a>). The underline font can be changed +with the <code class="code">uf</code> request. +</p> + + +<p>The <code class="code">ul</code> request does not underline spaces. +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002ecu"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.cu</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">lines</i></span>]</var><a class="copiable-link" href='#index-_002ecu'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-cu"></a> +<a class="index-entry-id" id="index-continuous-underlining-_0028cu_0029"></a> +<a class="index-entry-id" id="index-underlining_002c-continuous-_0028cu_0029"></a> +<p>The <code class="code">cu</code> request is similar to <code class="code">ul</code> but underlines spaces as +well (if a TTY output device is used). +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002euf"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.uf</code></strong> <var class="def-var-arguments">font</var><a class="copiable-link" href='#index-_002euf'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-uf"></a> +<a class="index-entry-id" id="index-underline-font-_0028uf_0029"></a> +<a class="index-entry-id" id="index-font-for-underlining-_0028uf_0029"></a> +<p>Set the underline font (globally) used by <code class="code">ul</code> and <code class="code">cu</code>. By +default, this is the font at position 2. <var class="var">font</var> can be either +a non-negative font position or the name of a font. +</p></dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002ebd"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.bd</code></strong> <var class="def-var-arguments">font [<span class="r"><i class="slanted">offset</i></span>]</var><a class="copiable-link" href='#index-_002ebd'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-bd"></a> +</dd><dt class="deffnx def-cmd-deffn" id="index-_002ebd-1"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.bd</code></strong> <var class="def-var-arguments">font1 font2 [<span class="r"><i class="slanted">offset</i></span>]</var><a class="copiable-link" href='#index-_002ebd-1'> ¶</a></span></dt> +<dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eb_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.b]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eb_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-_002eb"></a> +<a class="index-entry-id" id="index-imitating-boldface-_0028bd_0029"></a> +<a class="index-entry-id" id="index-boldface_002c-imitating-_0028bd_0029"></a> +<p>Embolden <var class="var">font</var> by overstriking its glyphs offset by <var class="var">offset</var> +units minus one. +</p> +<p>Two syntax forms are available. +</p> +<ul class="itemize mark-bullet"> +<li>Imitate a bold font unconditionally. The first argument specifies the +font to embolden, and the second is the number of basic units, minus +one, by which the two glyphs are offset. If the second argument is +missing, emboldening is turned off. + +<p><var class="var">font</var> can be either a non-negative font position or the name of a +font. +</p> +<p><var class="var">offset</var> is available in the <code class="code">.b</code> read-only register if a +special font is active; in the <code class="code">bd</code> request, its default unit is +‘<samp class="samp">u</samp>’. +</p> +</li><li><a class="index-entry-id" id="index-fspecial-request_002c-and-imitating-bold"></a> +<a class="index-entry-id" id="index-special"></a> +<a class="index-entry-id" id="index-embolding-of-special-fonts"></a> +<a class="index-entry-id" id="index-special-fonts_002c-emboldening"></a> +Imitate a bold form conditionally. Embolden <var class="var">font1</var> by <var class="var">offset</var> +only if font <var class="var">font2</var> is the current font. This request can be +issued repeatedly to set up different emboldening values for different +current fonts. If the second argument is missing, emboldening is turned +off for this particular current font. + +<p>This affects special fonts only (either set up with the <code class="code">special</code> +command in font files or with the <code class="code">fspecial</code> request). +</p></li></ul> +</dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002ecs"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.cs</code></strong> <var class="def-var-arguments">font [<span class="r"><i class="slanted">width</i></span> [<span class="r"><i class="slanted">em-size</i></span>]]</var><a class="copiable-link" href='#index-_002ecs'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-cs"></a> +<a class="index-entry-id" id="index-constant-glyph-space-mode-_0028cs_0029"></a> +<a class="index-entry-id" id="index-mode-for-constant-glyph-space-_0028cs_0029"></a> +<a class="index-entry-id" id="index-glyph_002c-constant-space"></a> +<a class="index-entry-id" id="index-ps-request_002c-and-constant-glyph-space-mode"></a> +<p>Switch to and from <em class="dfn">constant glyph space mode</em>. If activated, the +width of every glyph is <em class="math"><var class="var">width</var>/36</em> ems. The em size is given +absolutely by <var class="var">em-size</var>; if this argument is missing, the em value +is taken from the current font size (as set with the <code class="code">ps</code> request) +when the font is effectively in use. Without second and third argument, +constant glyph space mode is deactivated. +</p> +<p>Default scaling unit for <var class="var">em-size</var> is ‘<samp class="samp">z</samp>’; <var class="var">width</var> is an +integer. +</p></dd></dl> + + +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="Ligatures-and-Kerning.html">Ligatures and Kerning</a>, Previous: <a href="Special-Fonts.html">Special Fonts</a>, Up: <a href="Using-Fonts.html">Using Fonts</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> |