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1 <refentry xmlns="http://docbook.org/ns/docbook" | |
2 xmlns:xlink="http://www.w3.org/1999/xlink" | |
3 xmlns:xi="http://www.w3.org/2001/XInclude" | |
4 xmlns:src="http://nwalsh.com/xmlns/litprog/fragment" | |
5 xmlns:xsl="http://www.w3.org/1999/XSL/Transform" | |
6 version="5.0" xml:id="nominal.image.width"> | |
7 <refmeta> | |
8 <refentrytitle>nominal.image.width</refentrytitle> | |
9 <refmiscinfo class="other" otherclass="datatype">length</refmiscinfo> | |
10 </refmeta> | |
11 <refnamediv> | |
12 <refname>nominal.image.width</refname> | |
13 <refpurpose>The nominal image width</refpurpose> | |
14 </refnamediv> | |
15 | |
16 <refsynopsisdiv> | |
17 <src:fragment xml:id="nominal.image.width.frag"> | |
18 <xsl:param name="nominal.image.width" select="6 * $pixels.per.inch"/> | |
19 </src:fragment> | |
20 </refsynopsisdiv> | |
21 | |
22 <refsection><info><title>Description</title></info> | |
23 | |
24 <para>Graphic widths expressed as a percentage are problematic. In the | |
25 following discussion, we speak of width and contentwidth, but | |
26 the same issues apply to depth and contentdepth.</para> | |
27 | |
28 <para>A width of 50% means "half of the available space for the image." | |
29 That's fine. But note that in HTML, this is a dynamic property and | |
30 the image size will vary if the browser window is resized.</para> | |
31 | |
32 <para>A contentwidth of 50% means "half of the actual image width". | |
33 But what does that mean if the stylesheets cannot assess the image's | |
34 actual size? Treating this as a width of 50% is one possibility, but | |
35 it produces behavior (dynamic scaling) that seems entirely out of | |
36 character with the meaning.</para> | |
37 | |
38 <para>Instead, the stylesheets define a | |
39 <parameter>nominal.image.width</parameter> and convert percentages to | |
40 actual values based on that nominal size.</para> | |
41 | |
42 </refsection> | |
43 </refentry> | |
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