Question on JFreeChart and Batik

From: Shripathi Kamath (_at_)
Date: 11/26/03 

Date: Tue, 25 Nov 2003 17:17:52 -0800

I am trying to create SVG output for charts that can be produced by
JFreeChart.

I managed to figure out the necessary jar files to be included, and was able
to modify one of the demos to produce an SVG file. A SVG viewer shows the
correct output.

However, when I examine the SVG file, I see that the SVG generation looks
something like the following:

...
  <g>
    <defs id="defs1">
      <clipPath clipPathUnits="userSpaceOnUse" id="clipPath1">
        <path d="M0 0 L500 0 L500 270 L0 270 L0 0 Z" />
      </clipPath>
    </defs>
    <g style="font-family:sans-serif;" transform="translate(4,23)">
      <image x="0" y="0" width="500"
xlink:href="data:image/png;base64,iVBORw0KGg....image data...mCC"
style="clip-path:url(#clipPath1);" height="270" preserveAspectRatio="none"
/>
    </g>
  </g>

I do not see the vector graphics instructions that actually create the
chart, instead I see the rendered image.

Of course, I can use Batik and see that vector graphics elements for lines,
rectangles, etc.. do indeed get produced when I create a drawing myself.

The question is what should I be doing so that I can use Batik to generate
an SVG file format (with no embedded images) chart from JFreeChart.

Does someone have an example they wouldn't mind sharing, or know of a place
on the web where this info is readily available?

Thanks.

Here is my sample code:

+++
public void createSVG(Component component)
{
    // Get a DOMImplementation
    DOMImplementation domImpl =
GenericDOMImplementation.getDOMImplementation();

    // Create an instance of org.w3c.dom.Document
    Document document = domImpl.createDocument(null, "svg", null);

    // Create an instance of the SVG Generator
    SVGGraphics2D svgGenerator = new SVGGraphics2D(document);

    // Ask the object to render into the SVG Graphics2D implementation
    component.update(svgGenerator);

    // Finally, stream out SVG to the standard output using UTF-8
    // character to byte encoding
    boolean useCSS = true; // we want to use CSS style attribute
    try
    {
        Writer out = new OutputStreamWriter(new
FileOutputStream("output.svg"), "UTF-8");
        svgGenerator.stream(out, useCSS);
        out.close();
    }
    catch (Exception e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

and the sample modified.

public static void main(String[] args)
{
    AreaChartDemo demo = new AreaChartDemo("Area Chart Demo");
    demo.pack();
    RefineryUtilities.centerFrameOnScreen(demo);
    demo.setVisible(true);
    demo.createSVG(demo);
}

+++ 

-- 
Shripathi Kamath
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