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From "John R. Callahan" <jcalla...@sphere.com>
Subject Re: [ANNONUNCEMENT] ChartTransformer 0.0.4 released
Date Tue, 28 Jan 2003 20:32:09 GMT
I had some trouble with the ChartTransformer, but I have solved them and
wanted to share my results with fellow cocoon-users:

Context:
======
Cocoon2.1dev
Resin-2.1.6
Linux and Win2K
JDK 1.3.1 (_05 and _06)

(1) The use of GenericDOMImplementation produced weird SVG output:
the SVG elements had no tag names!  Very bizzare.  So, I thought that it
might be a problem with the DOM implementation.  So, I decided to use
the SVGDOMImplementation instead of GenericDOMImplementation.
First, import the SVGDOMImplementation package (part of Batik that
is packaged with 2.1dev):

import org.apache.batik.dom.svg.SVGDOMImplementation;

Then, around line 545 (in method endElement), I made the following
change.  (Sorry no patch).

     // build the svg
     //DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
     //Document document = domImpl.createDocument(null , "svg", null);
     DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
     String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
     Document document = domImpl.createDocument(svgNS,"svg",null);

(2) The ChartTransformer works under Win2K, but not under Linux!  It turns out
to be a problem with headless Java.  Since I am using JDK1.3.1, I had to
remember to set my DISPLAY environment variable appropriately.  Duh!

I like the ChartTransformer very much.  I am an experienced SVG hacker and
this has a comfortable feel with the rest of my tools.  It is simpler to understand
than Wings (althought I should have spent more time with Wings).   There is also
the xReporter tool that I have yet to examine carefully.  Perhaps a "graph" DTD
or WXS is in our future so that "Chart" Transformers can be interchangable.

-- jack

John R. Callahan, Ph.D.
jcallahan@sphere.com





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