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|
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="generator" content="AsciiDoc test">
<title>LaTeX Filter</title>
<style type="text/css">
/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
/* Default font. */
body {
font-family: Georgia,serif;
}
/* Title font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
thead, p.table.header,
#toctitle,
#author, #revnumber, #revdate, #revremark,
#footer {
font-family: Arial,Helvetica,sans-serif;
}
body {
margin: 1em 5% 1em 5%;
}
a {
color: blue;
text-decoration: underline;
}
a:visited {
color: fuchsia;
}
em {
font-style: italic;
color: navy;
}
strong {
font-weight: bold;
color: #083194;
}
h1, h2, h3, h4, h5, h6 {
color: #527bbd;
margin-top: 1.2em;
margin-bottom: 0.5em;
line-height: 1.3;
}
h1, h2, h3 {
border-bottom: 2px solid silver;
}
h2 {
padding-top: 0.5em;
}
h3 {
float: left;
}
h3 + * {
clear: left;
}
h5 {
font-size: 1.0em;
}
div.sectionbody {
margin-left: 0;
}
hr {
border: 1px solid silver;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
ul, ol, li > p {
margin-top: 0;
}
ul > li { color: #aaa; }
ul > li > * { color: black; }
.monospaced, code, pre {
font-family: "Courier New", Courier, monospace;
font-size: inherit;
color: navy;
padding: 0;
margin: 0;
}
pre {
white-space: pre-wrap;
}
#author {
color: #527bbd;
font-weight: bold;
font-size: 1.1em;
}
#email {
}
#revnumber, #revdate, #revremark {
}
#footer {
font-size: small;
border-top: 2px solid silver;
padding-top: 0.5em;
margin-top: 4.0em;
}
#footer-text {
float: left;
padding-bottom: 0.5em;
}
#footer-badges {
float: right;
padding-bottom: 0.5em;
}
#preamble {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
div.admonitionblock {
margin-top: 2.0em;
margin-bottom: 2.0em;
margin-right: 10%;
color: #606060;
}
div.content { /* Block element content. */
padding: 0;
}
/* Block element titles. */
div.title, caption.title {
color: #527bbd;
font-weight: bold;
text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
}
div.title + * {
margin-top: 0;
}
td div.title:first-child {
margin-top: 0.0em;
}
div.content div.title:first-child {
margin-top: 0.0em;
}
div.content + div.title {
margin-top: 0.0em;
}
div.sidebarblock > div.content {
background: #ffffee;
border: 1px solid #dddddd;
border-left: 4px solid #f0f0f0;
padding: 0.5em;
}
div.listingblock > div.content {
border: 1px solid #dddddd;
border-left: 5px solid #f0f0f0;
background: #f8f8f8;
padding: 0.5em;
}
div.quoteblock, div.verseblock {
padding-left: 1.0em;
margin-left: 1.0em;
margin-right: 10%;
border-left: 5px solid #f0f0f0;
color: #888;
}
div.quoteblock > div.attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock > pre.content {
font-family: inherit;
font-size: inherit;
}
div.verseblock > div.attribution {
padding-top: 0.75em;
text-align: left;
}
/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
div.verseblock + div.attribution {
text-align: left;
}
div.admonitionblock .icon {
vertical-align: top;
font-size: 1.1em;
font-weight: bold;
text-decoration: underline;
color: #527bbd;
padding-right: 0.5em;
}
div.admonitionblock td.content {
padding-left: 0.5em;
border-left: 3px solid #dddddd;
}
div.exampleblock > div.content {
border-left: 3px solid #dddddd;
padding-left: 0.5em;
}
div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; vertical-align: text-bottom; }
a.image:visited { color: white; }
dl {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
dt {
margin-top: 0.5em;
margin-bottom: 0;
font-style: normal;
color: navy;
}
dd > *:first-child {
margin-top: 0.1em;
}
ul, ol {
list-style-position: outside;
}
ol.arabic {
list-style-type: decimal;
}
ol.loweralpha {
list-style-type: lower-alpha;
}
ol.upperalpha {
list-style-type: upper-alpha;
}
ol.lowerroman {
list-style-type: lower-roman;
}
ol.upperroman {
list-style-type: upper-roman;
}
div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
margin-top: 0.1em;
margin-bottom: 0.1em;
}
tfoot {
font-weight: bold;
}
td > div.verse {
white-space: pre;
}
div.hdlist {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
div.hdlist tr {
padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
font-weight: bold;
}
td.hdlist1 {
vertical-align: top;
font-style: normal;
padding-right: 0.8em;
color: navy;
}
td.hdlist2 {
vertical-align: top;
}
div.hdlist.compact tr {
margin: 0;
padding-bottom: 0;
}
.comment {
background: yellow;
}
.footnote, .footnoteref {
font-size: 0.8em;
}
span.footnote, span.footnoteref {
vertical-align: super;
}
#footnotes {
margin: 20px 0 20px 0;
padding: 7px 0 0 0;
}
#footnotes div.footnote {
margin: 0 0 5px 0;
}
#footnotes hr {
border: none;
border-top: 1px solid silver;
height: 1px;
text-align: left;
margin-left: 0;
width: 20%;
min-width: 100px;
}
div.colist td {
padding-right: 0.5em;
padding-bottom: 0.3em;
vertical-align: top;
}
div.colist td img {
margin-top: 0.3em;
}
@media print {
#footer-badges { display: none; }
}
#toc {
margin-bottom: 2.5em;
}
#toctitle {
color: #527bbd;
font-size: 1.1em;
font-weight: bold;
margin-top: 1.0em;
margin-bottom: 0.1em;
}
div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
margin-top: 0;
margin-bottom: 0;
}
div.toclevel2 {
margin-left: 2em;
font-size: 0.9em;
}
div.toclevel3 {
margin-left: 4em;
font-size: 0.9em;
}
div.toclevel4 {
margin-left: 6em;
font-size: 0.9em;
}
span.aqua { color: aqua; }
span.black { color: black; }
span.blue { color: blue; }
span.fuchsia { color: fuchsia; }
span.gray { color: gray; }
span.green { color: green; }
span.lime { color: lime; }
span.maroon { color: maroon; }
span.navy { color: navy; }
span.olive { color: olive; }
span.purple { color: purple; }
span.red { color: red; }
span.silver { color: silver; }
span.teal { color: teal; }
span.white { color: white; }
span.yellow { color: yellow; }
span.aqua-background { background: aqua; }
span.black-background { background: black; }
span.blue-background { background: blue; }
span.fuchsia-background { background: fuchsia; }
span.gray-background { background: gray; }
span.green-background { background: green; }
span.lime-background { background: lime; }
span.maroon-background { background: maroon; }
span.navy-background { background: navy; }
span.olive-background { background: olive; }
span.purple-background { background: purple; }
span.red-background { background: red; }
span.silver-background { background: silver; }
span.teal-background { background: teal; }
span.white-background { background: white; }
span.yellow-background { background: yellow; }
span.big { font-size: 2em; }
span.small { font-size: 0.6em; }
span.underline { text-decoration: underline; }
span.overline { text-decoration: overline; }
span.line-through { text-decoration: line-through; }
div.unbreakable { page-break-inside: avoid; }
/*
* xhtml11 specific
*
* */
div.tableblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
div.tableblock > table {
border: 3px solid #527bbd;
}
thead, p.table.header {
font-weight: bold;
color: #527bbd;
}
p.table {
margin-top: 0;
}
/* Because the table frame attribute is overridden by CSS in most browsers. */
div.tableblock > table[frame="void"] {
border-style: none;
}
div.tableblock > table[frame="hsides"] {
border-left-style: none;
border-right-style: none;
}
div.tableblock > table[frame="vsides"] {
border-top-style: none;
border-bottom-style: none;
}
/*
* html5 specific
*
* */
table.tableblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
thead, p.tableblock.header {
font-weight: bold;
color: #527bbd;
}
p.tableblock {
margin-top: 0;
}
table.tableblock {
border-width: 3px;
border-spacing: 0px;
border-style: solid;
border-color: #527bbd;
border-collapse: collapse;
}
th.tableblock, td.tableblock {
border-width: 1px;
padding: 4px;
border-style: solid;
border-color: #527bbd;
}
table.tableblock.frame-topbot {
border-left-style: hidden;
border-right-style: hidden;
}
table.tableblock.frame-sides {
border-top-style: hidden;
border-bottom-style: hidden;
}
table.tableblock.frame-none {
border-style: hidden;
}
th.tableblock.halign-left, td.tableblock.halign-left {
text-align: left;
}
th.tableblock.halign-center, td.tableblock.halign-center {
text-align: center;
}
th.tableblock.halign-right, td.tableblock.halign-right {
text-align: right;
}
th.tableblock.valign-top, td.tableblock.valign-top {
vertical-align: top;
}
th.tableblock.valign-middle, td.tableblock.valign-middle {
vertical-align: middle;
}
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
vertical-align: bottom;
}
/*
* manpage specific
*
* */
body.manpage h1 {
padding-top: 0.5em;
padding-bottom: 0.5em;
border-top: 2px solid silver;
border-bottom: 2px solid silver;
}
body.manpage h2 {
border-style: none;
}
body.manpage div.sectionbody {
margin-left: 3em;
}
@media print {
body.manpage div#toc { display: none; }
}
</style>
<script type="text/javascript">
/*<+'])');
// Function that scans the DOM tree for header elements (the DOM2
// nodeIterator API would be a better technique but not supported by all
// browsers).
var iterate = function (el) {
for (var i = el.firstChild; i != null; i = i.nextSibling) {
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
var mo = re.exec(i.tagName);
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
}
iterate(i);
}
}
}
iterate(el);
return result;
}
var toc = document.getElementById("toc");
if (!toc) {
return;
}
// Delete existing TOC entries in case we're reloading the TOC.
var tocEntriesToRemove = [];
var i;
for (i = 0; i < toc.childNodes.length; i++) {
var entry = toc.childNodes[i];
if (entry.nodeName.toLowerCase() == 'div'
&& entry.getAttribute("class")
&& entry.getAttribute("class").match(/^toclevel/))
tocEntriesToRemove.push(entry);
}
for (i = 0; i < tocEntriesToRemove.length; i++) {
toc.removeChild(tocEntriesToRemove[i]);
}
// Rebuild TOC entries.
var entries = tocEntries(document.getElementById("content"), toclevels);
for (var i = 0; i < entries.length; ++i) {
var entry = entries[i];
if (entry.element.id == "")
entry.element.id = "_toc_" + i;
var a = document.createElement("a");
a.href = "#" + entry.element.id;
a.appendChild(document.createTextNode(entry.text));
var div = document.createElement("div");
div.appendChild(a);
div.className = "toclevel" + entry.toclevel;
toc.appendChild(div);
}
if (entries.length == 0)
toc.parentNode.removeChild(toc);
},
/////////////////////////////////////////////////////////////////////
// Footnotes generator
/////////////////////////////////////////////////////////////////////
/* Based on footnote generation code from:
* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
*/
footnotes: function () {
// Delete existing footnote entries in case we're reloading the footnodes.
var i;
var noteholder = document.getElementById("footnotes");
if (!noteholder) {
return;
}
var entriesToRemove = [];
for (i = 0; i < noteholder.childNodes.length; i++) {
var entry = noteholder.childNodes[i];
if (entry.nodeName.toLowerCase() == 'div' && entry.getAttribute("class") == "footnote")
entriesToRemove.push(entry);
}
for (i = 0; i < entriesToRemove.length; i++) {
noteholder.removeChild(entriesToRemove[i]);
}
// Rebuild footnote entries.
var cont = document.getElementById("content");
var spans = cont.getElementsByTagName("span");
var refs = {};
var n = 0;
for (i=0; i<spans.length; i++) {
if (spans[i].className == "footnote") {
n++;
var note = spans[i].getAttribute("data-note");
if (!note) {
// Use [\s\S] in place of . so multi-line matches work.
// Because JavaScript has no s (dotall) regex flag.
note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
spans[i].innerHTML =
"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
"' title='View footnote' class='footnote'>" + n + "</a>]";
spans[i].setAttribute("data-note", note);
}
noteholder.innerHTML +=
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</head>
<body class="article">
<div id="header">
<h1>LaTeX Filter</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The AsciiDoc distribution includes a LaTeX filter that translates LaTeX source
to an image which is automatically inserted into the AsciiDoc output document.
Although it can accept any LaTeX source, the primary use is to render
mathematical formulae (see the examples below). The filter implements the
<em>latex</em> Listing block and Paragraph styles.</p></div>
<div class="paragraph"><p>Two image formats are supported; PNG and SVG. PNG is the default since that
was the first format that this filter supported. However, SVG is a better
format since it’s scalable. Using SVG make formulas look good in both PDFs
and on web pages. SVG will also scale well when zooming in on a web page for
example. It is recommended to always use the SVG format. This can be done by
setting the <em>imgfmt</em> parameter to <em>svg</em>, as is done below. An even better way
is to set the global attribute <em>latex-imgfmt</em> to <em>svg</em>. Then SVG will be used
for all formulas.</p></div>
<div class="paragraph"><p>This LaTeX paragraph:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>["latex", imgfmt="svg"]
---------------------------------------------------------------------
\begin{equation*}
y = \int_0^\infty \gamma^2 \cos(x) dx
\end{equation*}
---------------------------------------------------------------------</pre>
</div></div>
<div class="paragraph"><p>Renders:</p></div>
<div class="imageblock latex">
<div class="content">
<img src="latex-filter__1.svg" alt="latex-filter__1.svg">
</div>
</div>
<div class="paragraph"><p>Compare the formula above, which is rendered as an SVG image, to the formula
below which has been rendered as a PNG image. The difference will be most
notable if zooming in on a web page, printing the web page or when rendering
the document as a PDF.</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>["latex", "latex2.png", 140, imgfmt="png"]
---------------------------------------------------------------------
\begin{equation*}
y = \int_0^\infty \gamma^2 \cos(x) dx
\end{equation*}
---------------------------------------------------------------------</pre>
</div></div>
<div class="paragraph"><p>Renders:</p></div>
<div class="imageblock latex">
<div class="content">
<img src="latex2.png" alt="latex2.png">
</div>
</div>
<div class="paragraph"><p>This LaTeX block:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>["latex","latex1.svg",imgfmt="svg",align="center"]
---------------------------------------------------------------------
\begin{equation*}
\displaystyle{ V_i = C_0 - C_3
\frac{C_1\cos(\theta_i+C_3)}{C_4+C_1\cos(\theta_i+C_2)} }
\end{equation*}
---------------------------------------------------------------------</pre>
</div></div>
<div class="paragraph"><p>Renders:</p></div>
<div class="imageblock latex" style="text-align:center;">
<div class="content">
<img src="latex1.svg" alt="latex1.svg">
</div>
</div>
<div class="paragraph"><p>This LaTeX block:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>.LaTeX filter example
[latex]
["latex","latex3.svg",imgfmt="svg"]
---------------------------------------------------------------------
\begin{equation}
\Re{z} =\frac{n\pi \dfrac{\theta +\psi}{2}}{
\left(\dfrac{\theta +\psi}{2}\right)^2 + \left( \dfrac{1}{2}
\log \left\lvert\dfrac{B}{A}\right\rvert\right)^2}.
\end{equation}
\begin{equation}
\boxed{\eta \leq C(\delta(\eta) +\Lambda_M(0,\delta))}
\end{equation}
\begin{equation}\label{first}
a=b+c
\end{equation}
\begin{subequations}\label{grp}
\begin{align}
a&=b+c\label{second}\\
d&=e+f+g\label{third}\\
h&=i+j\label{fourth}
\end{align}
\end{subequations}
---------------------------------------------------------------------</pre>
</div></div>
<div class="paragraph"><p>Renders:</p></div>
<div class="imageblock latex">
<div class="content">
<img src="latex3.svg" alt="latex3.svg">
</div>
<div class="title">Figure 1. LaTeX filter example</div>
</div>
<div class="paragraph"><p>This LaTeX paragraph:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>.A LaTeX table
["latex",imgfmt="svg"]
\begin{tabular}{c r @{.} l}
Pi expression &
\multicolumn{2}{c}{Value} \\
\hline
$\pi$ & 3&1416 \\
$\pi^{\pi}$ & 36&46 \\
$(\pi^{\pi})^{\pi}$ & 80662&7 \\
\end{tabular}</pre>
</div></div>
<div class="paragraph"><p>Renders:</p></div>
<div class="imageblock latex">
<div class="content">
<img src="latex-filter__2.svg" alt="latex-filter__2.svg">
</div>
<div class="title">Figure 2. A LaTeX table</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_using_the_filter">Using the Filter</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
The LaTeX filter is invoked by setting the Listing block or
Paragraph style (the first positional block attribute) to <em>latex</em>.
</p>
</li>
<li>
<p>
The second positional attribute (named <em>target</em> is optional, it sets
the name of the generated image file. If this is not supplied a
file name like <span class="monospaced">{docname}__{target-number}.{imgfmt}</span> is synthesised
(where <span class="monospaced">{docname}</span> is the document file name, <span class="monospaced">{target-number}</span>
is an integer number and <span class="monospaced">{imgfmt}</span> is the image format (png or svg).
</p>
</li>
<li>
<p>
The third positional attribute, named <em>dpi</em>, is also optional; it is
an integer number that sets the output resolution in dots per inch
for a PNG image. It is ignored for an SVG image.
</p>
</li>
<li>
<p>
The image format to use can be selected by setting the <em>imgfmt</em>
parameter or by globally setting the <em>latex-imgfmt</em> attribute.
Setting it to <em>svg</em> will render SVG images and setting it to <em>png</em>
will render PNG images. The default is <em>png</em>.
</p>
</li>
</ul></div>
<div class="paragraph"><p>Because the LaTeX images are rendered using the image block templates
you can also use the optional named image block attributes (see
<a href="userguide.html#X55">Image macro attributes</a> in the AsciiDoc User
Guide).</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Tip</div>
</td>
<td class="content">
<div class="paragraph"><p>You can also change the image size using the following LaTeX commands:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>\tiny
\scriptsize
\footnotesize
\small
\normalsize
\large
\Large
\LARGE
\huge</pre>
</div></div>
<div class="paragraph"><p>For example:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>[latex]
\Large $y = \int_0^\infty \gamma^2 \cos(x) dx$</pre>
</div></div>
<div class="paragraph"><p>The <span class="monospaced">\Large</span> command is outside the <span class="monospaced">$</span> math delimiters.</p></div>
</td>
</tr></table>
</div>
<div class="paragraph"><p>The filter (<span class="monospaced">./filters/latex/latex2img.py</span>) can be used outside
AsciiDoc to convert LaTeX source to images.</p></div>
<div class="paragraph"><p>Execute the following command to see how to use it:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>$ ./filters/latex/latex2img.py --help</pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_limitations">Limitations</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
The <span class="monospaced">asciidoc(1)</span> input and output files cannot both be <span class="monospaced">-</span> (stdin
and stdout), either the input or output files (or both) must be a
named file.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_installation">Installation</h2>
<div class="sectionbody">
<div class="paragraph"><p>In addition to AsciiDoc you will need to have <span class="monospaced">latex(1)</span>,
<span class="monospaced">dvipng(1)</span> (for PNG) and/or <span class="monospaced">dvisvgm(1)</span> (for SVG) installed.</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr></div>
<div id="footer">
<div id="footer-text">
Last updated
2002-11-25 00:37:42 UTC
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