Re: [docbook-apps] general approach to image maps

["Bob Stayton" <bobs@sagehill.net>]

I've been meaning to modularize that big process.image template to make it 
easier to customize.  Maybe by 1.72.

You could instead customize the template named process.image.attributes 
from html/graphics.xsl.  It is called by process.image, it is only about 
100 lines, and its purpose is to add attributes to img.

Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs@sagehill.net


----- Original Message ----- 
From: "Georges Schmitz" <georges.schmitz@arcor.de>
To: <docbook-apps@lists.oasis-open.org>
Sent: Thursday, November 02, 2006 1:09 AM
Subject: [docbook-apps] general approach to image maps


> I'm searching for a general approach for using image maps with DocBook
> and I'm not referring to the image maps of callout objects.
>
> I'm using graphviz to produce PNGs and the corresponding MAP files, so I
> can rely on correctly calculated maps. All I need is a meaningful place
> for leaving some information that a specific image comes along with a
> map (which of course - as external code - needs to be included into the
> html code).
>
> If I would just have to insert the map content directly after the <img>
> tag, one could surely argue, that a PI (eg. dbhtml-include) could do the
> job (similar to what Bob mentions in
> http://www.sagehill.net/docbookxsl/InsertExtHtml.html#CodeInPage). But
> this will not work for 2 reasons:
>
>   1. PIs are only processed outside figure markup (eg. only explicit
>      apply-templates="imagedata" in imageobject prevent PIs to become
>      effective)
>   2. I need a usemap attribute directly in the img tag
>
> Currently for me a straightforward approach would be something like the
> following:
>
>      <figure>
>         <title>ER diagram (compact) of Type Certification</title>
>         <mediaobject>
>            <imageobject role="fo">
>               <imagedata depth="22cm" height="22cm" format="SVG"
> fileref="../dot/tc-compact.svg"/>
>            </imageobject>
>            <imageobject role="html">
>               <imagedata format="PNG" fileref="../dot/tc-compact.png"/>
>               <?imagemap fileref="../dot/tc-compact.map"?>
>            </imageobject>
>         </mediaobject>
>      </figure>
>
> But where to start? There are 2 templates to deal with, when I
> want to introduce such functionality in a customization layer
>
> (A) (very simple)
> <xsl:template match="imageobject">
> just needs to be extended with a <xsl:apply-templates
> select="processing-instruction()"/> for loading the map and pasting it
> into the html code.
>
> (B) (with 800 lines to big for a customization layer in my opinion)
> <xsl:template name="process.image">
>
> In (A) I would load the map into a variable, extract the map name or id,
> pass it over as parameter "usemap" to the imagedata template which in
> its turn passes it to the named template "process.image" (B).
>
> But what should I do with <xsl:template name="process.image">? As I
> already said, I don't think that copying and pasting such a template
> into a customization layer is the right approach. Should I extend it
> first on my own and than file a request to see appear such functionality
> in the main distribution?
>
> Thanks,
> Georges
>
>
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