Re: Strange XML output bug

[Archie Cobbs]

Thomas DeWeese wrote:
  I've looked at the code fairly closely and I can't see why
this would happen.  The only real difference I see is that I
think width/height get set twice.
That must have something to do with it...
I suppose this is likely not a Batik bug... I'm using xalan 2.6.0
and xerces 2.6.2.
   Does this mean that you are using the Xerces DOM Implementation
as well?  I suppose it's possible that there is a bug where
setting an attribute twice with a null namespace does this in
their DOM implementation.
I'm not sure what DOM implementation I'm using, I'm just using
the javax.xml APIs on JDK 1.4.2 (see attachment).
I tried to create a simple test case that reproduces this bug but
of course when I did that it didn't happen. Will keep trying.
   Of course ;)
   Please let us know if you succeed (a Bug report in any case
might be useful, but especially if there is a reproducible
test case).
I am determined to track this down today :-) In any case, attached
is my test program, which doesn't yet demonstrate the bug, but does
show basically how I'm doing things.
Thanks,
-Archie
__________________________________________________________________________
Archie Cobbs      *        CTO, Awarix        *      http://www.awarix.com
import java.awt.Color;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.io.ByteArrayOutputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.batik.svggen.SVGGraphics2D;
import org.apache.batik.util.SVGConstants;
import org.apache.batik.util.XMLConstants;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class ImportBug implements XMLConstants, SVGConstants {

    public static final String SVG_PUBLIC_ID
      = "-//W3C//DTD SVG 1.1//EN";
    public static final String SVG_DTD
      = "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd";;
    public static final String SVG_MEDIA_TYPE = "image/svg+xml";

    protected static DOMImplementation getDOMImplementation() throws Exception {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setNamespaceAware(true);
        dbf.setIgnoringComments(false);
        try {
            return dbf.newDocumentBuilder().getDOMImplementation();
        } catch (ParserConfigurationException e) {
            throw new Exception("Can't create XML document builder", e);
        }
    }

    protected static Document createDocument() throws Exception {
        DOMImplementation di = getDOMImplementation();
        Document doc = di.createDocument(SVG_NAMESPACE_URI, "svg",
          di.createDocumentType("svg", SVG_PUBLIC_ID, SVG_DTD));
        doc.getDocumentElement().setAttributeNS(XMLNS_NAMESPACE_URI,
          XMLNS_PREFIX, SVG_NAMESPACE_URI);
        doc.getDocumentElement().setAttributeNS(XMLNS_NAMESPACE_URI,
          XMLNS_PREFIX + ":" + XLINK_PREFIX, XLINK_NAMESPACE_URI);
        return doc;
    }

    protected static Transformer getTransformer() throws Exception {
        Transformer transformer;
        try {
            transformer = TransformerFactory.newInstance().newTransformer();
        } catch (TransformerConfigurationException e) {
            throw new Exception("can't create XML transformer", e);
        }
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.MEDIA_TYPE, SVG_MEDIA_TYPE);
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        return transformer;
    }

    public static void main(String[] args) throws Exception {

        // Create document
        Document doc = createDocument();

        // Build document
        createDoc(doc);

        // Output document
        getTransformer().transform(new DOMSource(doc),
          new StreamResult(new BufferedOutputStream(System.out)));
    }

    private static void createDoc(Document doc) throws Exception {

        // Get root <svg> element
        Element root = doc.getDocumentElement();
        root = addElement(root, "g");

        // Add a <svg> child
        Element svg = addElement(root, "svg");
        svg.setAttribute("viewBox", "0 0 200 200");
        svg.setAttribute("overflow", "visible");

        // Create a Graphics2D -> SVG transcoder
        SVGGraphics2D g2d = new SVGGraphics2D(svg.getOwnerDocument());

        // Render image, converting it to SVG
        g2d.setColor(Color.RED);
        g2d.fillRect(0, 0, 100, 100);
        g2d.drawImage(getImage(), 20, 20, 60, 60, null);

        // Get resulting SVG
        svg = g2d.getRoot(svg);

        // Set up viewbox
        svg.setAttribute("width", "200");
        svg.setAttribute("height", "200");

        // Discard converter
//        g2d.dispose();
    }

    private static Element addElement(Element parent, String name) {
        Element elem = parent.getOwnerDocument().createElementNS(
          SVG_NAMESPACE_URI, name);
        parent.appendChild(elem);
        return elem;
    }

    private static Image getImage() throws Exception {
        return new javax.swing.ImageIcon("jc.png").getImage();
    }
}

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