<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>length-in-points</title><link rel="stylesheet" type="text/css" href="../reference.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="../index.html" title="DocBook XSL Stylesheets: Reference Documentation"><link rel="up" href="generallibrary.html" title="General Library Templates"><link rel="prev" href="length-spec.html" title="length-spec"><link rel="next" href="pi-attribute.html" title="pi-attribute"><link rel="copyright" href="copyright.html" title="License"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">length-in-points</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="length-spec.html">Prev</a> </td><th width="60%" align="center">General Library Templates</th><td width="20%" align="right"> <a accesskey="n" href="pi-attribute.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="length-in-points"></a><div class="titlepage"></div>
<div class="refnamediv"><h2>length-in-points</h2><p>
length-in-points
— Returns the size, in points, of a specified length
</p></div>
<div class="refsect1"><a name="idp9540224"></a><h2>Description</h2>
<p>The <code class="function">length-in-points</code> template converts a length
specification to points and returns that value as an unqualified
number.
</p>
<div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
<p>There is no way for the template to infer the size of an
<code class="literal">em</code>. It relies on the default <em class="parameter"><code>em.size</code></em>
which is initially <code class="literal">10</code> (for 10pt).</p>
<p>Similarly, converting pixels to points relies on the
<a href="../html/pixels.per.inch.html"><em class="parameter"><code>pixels.per.inch</code></em></a> parameter which is initially
<code class="literal">90</code>.
</p>
</div>
<a name="length-in-points.frag"></a><pre class="programlisting">
<xsl:template name="length-in-points">
<xsl:param name="length" select="'0pt'"></xsl:param>
<xsl:param name="em.size" select="10"></xsl:param>
<xsl:param name="pixels.per.inch" select="90"></xsl:param>
<xsl:variable name="magnitude">
<xsl:call-template name="length-magnitude">
<xsl:with-param name="length" select="$length"></xsl:with-param>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="units">
<xsl:value-of select="substring($length, string-length($magnitude)+1)"></xsl:value-of>
</xsl:variable>
<xsl:choose>
<xsl:when test="$units = 'pt'">
<xsl:value-of select="$magnitude"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'cm'">
<xsl:value-of select="$magnitude div 2.54 * 72.0"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'mm'">
<xsl:value-of select="$magnitude div 25.4 * 72.0"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'in'">
<xsl:value-of select="$magnitude * 72.0"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'pc'">
<xsl:value-of select="$magnitude * 12.0"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'px'">
<xsl:value-of select="$magnitude div $pixels.per.inch * 72.0"></xsl:value-of>
</xsl:when>
<xsl:when test="$units = 'em'">
<xsl:value-of select="$magnitude * $em.size"></xsl:value-of>
</xsl:when>
<xsl:otherwise>
<xsl:message>
<xsl:text>Unrecognized unit of measure: </xsl:text>
<xsl:value-of select="$units"></xsl:value-of>
<xsl:text>.</xsl:text>
</xsl:message>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</pre>
</div>
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