Re: [docbook-apps] imagedata as olink anchors

["administrator at ivanmoravec dot net" <denis dot bradford at verizon dot net>]

> Regarding image maps, there is no support in the DocBook
> stylesheets for them.  Perhaps someone has written a
> customization that can do that.

I implemented a client-side image map. An example is in my  Website 
project at http://www.ivanmoravec.net/schedule/schedule.html. On the 
image side I customized two templates in docbook/html/graphics.xsl. The 
map side then just required a few simple new templates. Source markup is 
pretty straightforward.

FWIW, here's how it works:

Sample page source markup:
--------------------------
    <mediaobject>
      <imageobject>          <!-- image to be mapped -->
        <?usemap mymap?>     <!-- PI to specify the map name  -->
        <imagedata depth="134px" fileref="../images/bigworld.gif" 
width="512px"/>
      </imageobject>

         .
         .
         .
<!-- Section for map. label must match name in usemap PI. -->
  <section label="mymap" role="imagemap">
    <title role="ignore"></title>
    <para role="area">
       <phrase role="shape">CIRCLE</phrase>
       <phrase role="coords">401,53,4</phrase>
       <phrase role="href">#apr29.2004gig</phrase>
       <phrase role="alt">Prague 29.4.2004</phrase>
    </para>
    <para role="area">
       <phrase role="shape">CIRCLE</phrase>
         .
         .
         .
  </section>

XSL customizations (with a little context):
-------------------------------------------
1. <xsl:template name="process.image">
        <xsl:param name="mapname"/>      <!-- imagemap customization -->
         .
         .
         .
        <xsl:if test="@align">
            <xsl:attribute name="align">
              <xsl:choose>
                <xsl:when test="@align = 'center'">middle</xsl:when>
                <xsl:otherwise>
                  <xsl:value-of select="@align"/>
                </xsl:otherwise>
              </xsl:choose>
            </xsl:attribute>
          </xsl:if>

     <!-- imagemap customization -->
          <xsl:if test="$mapname">
            <xsl:attribute name="usemap">
              <xsl:text>#</xsl:text><xsl:value-of select="$mapname"/>
            </xsl:attribute>
          </xsl:if>
     <!-- end imagemap customization -->

2. <xsl:template match="imagedata">
         .
         .
         .
      <xsl:call-template name="process.image">

<!--  imagemap customization -->
        <xsl:with-param name="mapname">
          <xsl:value-of 
select="ancestor::*/processing-instruction('usemap')"/>
        </xsl:with-param>
<!-- end imagemap customization  -->

3. New templates:

<xsl:template match="section[@role='imagemap']">
  <map>
    <xsl:attribute name="name">
      <xsl:value-of select="./@label"/>
    </xsl:attribute>
    <xsl:apply-templates/>
  </map>
</xsl:template>

<xsl:template match="para[@role='area']">
  <xsl:text>
  </xsl:text>
  <area>
    <xsl:attribute name="shape">
      <xsl:value-of select="phrase[@role='shape']"/>
    </xsl:attribute>

    <xsl:attribute name="coords">
      <xsl:value-of select="phrase[@role='coords']"/>
    </xsl:attribute>

    <xsl:attribute name="href">
      <xsl:value-of select="phrase[@role='href']"/>
    </xsl:attribute>

    <xsl:attribute name="alt">
      <xsl:value-of select="phrase[@role='alt']"/>
    </xsl:attribute>
  </area>
</xsl:template>



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