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Subject: Re: [docbook-apps] Image callouts and roles



Hi Chris,
Rendering two images side-by-side in FO output is not expected behavior.  The selection process takes into account all the allowed objects:
 
<xsl:template name="select.mediaobject.index">
  <xsl:param name="olist"
             select="imageobject|imageobjectco
                     |videoobject|audioobject|textobject"/>
   ...
 
You say you got both the .svg and the .png image in your FO output?  I copied and pasted your example into a test file and processed it with the stock 1.76.1 stylesheet and I got just the .svg image.
 
Bob Stayton
Sagehill Enterprises
bobs@sagehill.net
 
 
----- Original Message -----
From: Chris Ridd
Sent: Thursday, September 29, 2011 3:29 AM
Subject: [docbook-apps] Image callouts and roles

I'm using role attributes and the docbook stylesheets (successfully) to use one image format when rendering to FO, and other when rendering to HTML (i.e. epub).

      <figure xml:id="foo"><title>Foo</title>
        <mediaobject>
          <imageobject role="fo">
            <imagedata fileref="images/DIT-local.pdf"/>
          </imageobject>

          <imageobject role="html">
            <imagedata fileref="images/DIT-local.png"/>
          </imageobject>
        </figure>

However I have a couple of images using callouts, and using roles like that doesn't seem to work:

          <screenshot>
            <mediaobject>
              <imageobjectco role="fo">
                <areaspec>
                  <area coords="50,443,129,463" xml:id="Setting_Up_init_user"/>
                </areaspec>

                <imageobject>
                  <imagedata fileref="images/MVC-DIT-structure.svg" scale="50"/>
                </imageobject>
              </imageobjectco>
          <imageobject role="html">
               <!--
                <areaspec>
                  <area coords="50,443,129,463" xml:id="Setting_Up_init_user"/>
                </areaspec>
                -->
        <imagedata fileref="images/MVC-DIT-structure.png" scale="50"/>
          </imageobject>
            </mediaobject>
          </screenshot>

The SVG is just a wrapper that references the similarly named PNG and then adds some callout bugs.

Rendering that to FO results in two images side-by-side. Not sure if that's a bug, or expected behaviour. It isn't what I want though.

However if I change the second imageobject to an imageobjectco, which seems the logical structure, the <area> is problematic - I have a single calloutlist that needs to refer to the "same" callout in either image. And I can't have two <area>s with have the same xml:id :-(

I hate image callouts! :-)

Is there a more correct way to organize my two alternate images?

Cheers,

Chris



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