I had a closer look into Batik's source code for methods
SVGGraphics2D.stream and DOMUtilities.writeDocument and saw that they use
different node traversal methods:
DOMUtilities.writeDocument(...) uses
Node n = doc.getFirstChild();
and loops over
n = n.getNextSibling();
whereas
SVGGraphics2D.stream(...) uses
NodeList childList = docFragment.getChildNodes();
and loops over
Node child = childList.item(i);
Probably this is the reason for the different behaviour, so that in my case
only SVGGraphics2D.stream(...) works.
But I have not debugged the code to gain further explanations...
Best regards,
Maik
----- Original Message -----
From: "Bibek Sahu" <[EMAIL PROTECTED]>
To: "Batik Users" <[EMAIL PROTECTED]>
Sent: Friday, February 06, 2004 8:53 PM
Subject: Re: storing SVG DOM tree contents to a file by method
org.apache.batik.svggen.SVGGraphics2D.stream(...) very slow !
>
> Hrm... confusing.
>
> Of course, the more I think about it, if there were high-performance code
> in one of those methods, then it would probably also be in the other...
> (and I think they both use the same underlying XmlWriter, so). Silly
> idea o' mine. But that doesn't explain why the document contains no nodes
> when you write it out with with DOMUtilities; the document should be the
> same for both situation.
>
> The only other suggestion I could make is to increase the size of your
> write buffer. I notice that it's "only" 128k. If your files end up in
> the 1.5MB range, you might see an improvement by kicking your buffer size
> up to 1MB or so. I notice that the code inside SVGGraphics2D.stream()
> doesn't even use a BufferedWriter; I have no idea whether there's a reason
> for that or not.
>
> Good luck,
> Bibek
>
>
> On Fri, 6 Feb 2004, Magic Finger wrote:
>
> > Thanks for your help Bibek, but unfortunately no elements were written
out
> > to SVG file when replacing in my code shown below the statement
> > svgGenerator.stream(out, useCSS);
> > by your alternative suggestion
> > DOMUtilities.writeDocument(myFactory, out);
> >
> > It seems that 'myFactory' (which is an instance of org.w3c.dom.Document)
> > contains no Node elements -- very strange !?
> >
> > Best regards,
> > Maik
> >
> >
> > ----- Original Message -----
> > From: "Bibek Sahu" <[EMAIL PROTECTED]>
> > To: "Batik Users" <[EMAIL PROTECTED]>
> > Sent: Friday, February 06, 2004 4:23 PM
> > Subject: Re: storing SVG DOM tree contents to a file by method
> > org.apache.batik.svggen.SVGGraphics2D.stream(...) very slow !
> >
> >
> > >
> > > Another way is to use
> > >
org.apache.batik.dom.util.DOMUtilities.writeDocument(org.w3c.dom.Document
> > doc, java.io.Writer w)
> > >
> > >
> > > Don't know whether it's faster or not, but it's worth a shot. It
works
> > > pretty well for me, but my SVGs are smaller than yours...
> > >
> > > Good luck!
> > > - Bibek
> > >
> > >
> > > On Fri, 6 Feb 2004, Magic Finger wrote:
> > >
> > > > Hello,
> > > >
> > > > I have serious performance problems when writing out the SVG DOM
tree by
> > the
> > > > Batik SVG-Generator method
> > > > org.apache.batik.svggen.SVGGraphics2D.stream(...).
> > > >
> > > > Writing out ~ 20.000 lines to a SVG file by method
> > SVGGraphics2D.stream(...)
> > > > with BufferedWriter takes ~3 minutes -- that's unbelievable slow.
> > > > The resulting size of the SVG file is ~1.3 MB.
> > > >
> > > > Does anybody can tell me how to accelerate file writing, or is it
just a
> > > > normal, poor behaviour of Batik's internal SVGGraphics2D.XmlWriter ?
> > > >
> > > > And any idea how to give a "I am working..." feedback to users while
> > > > streaming out the DOM tree contents to an SVG file, e.g. by showing
a
> > > > progressbar ?
> > > >
> > > > The DOM tree contents are just lines and the resulting SVG file
looks
> > like
> > > > this:
> > >
> >
> --------------------------------------------------------------------------
> > > > <?xml version="1.0"?>
> > > >
> > > > <!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.0//EN'
> > > > 'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'>
> > > > <svg fill-opacity="1" xmlns:xlink="http://www.w3.org/1999/xlink";
> > > > color-rendering="auto" color-interpolation="auto"
text-rendering="auto"
> > > > stroke="black" stroke- linecap="square" stroke-miterlimit="10"
> > > > shape-rendering="auto" stroke-opacity="1" fill="black"
> > > > stroke-dasharray="none" font-weight="normal" stroke-width="1"
> > > > xmlns="http://www.w3.org/2000/svg";
font-family="'sansserif'"
> > > > font-style="normal" stroke-linejoin="miter" font-size="12"
> > > > stroke-dashoffset="0" image-rendering="auto">
> > > > <!--Generated by Foo-->
> > > > <defs id="genericDefs" />
> > > > <g>
> > > > <g fill="white" stroke="white">
> > > > <rect width="562" x="0" height="378" y="0" stroke="none" />
> > > > </g>
> > > > <g stroke-linecap="round" fill="rgb(204,255,204)"
> > > > text-rendering="optimizeLegibility" stroke-linejoin="round"
> > > > stroke="rgb(204,255,204)" stroke- width="0.375">
> > > > <line y2="217" fill="none" x1="222" x2="222" y1="217" />
> > > > ...
> > > > <line fill="none" x1="60" x2="61" y1="153" y2="153"
stroke="blue"
> > > > stroke-width="0.5" />
> > > > ...
> > > > <line fill="none" x1="477" x2="477" y1="258" y2="258"
> > stroke="black"
> > > > stroke-width="2" />
> > > > ...
> > > > </g>
> > > > </g>
> > > > </svg>
> > >
> >
> --------------------------------------------------------------------------
> > > >
> > > > The lines were generated for a JPanel by explicetely calling its
> > > > paintComponent(Graphics g) method with an instance of SVGGraphics2D
as
> > the
> > > > parameter 'g' (please see code snippets below):
> > >
> >
> --------------------------------------------------------------------------
> > > > ...
> > > > File svgFile;
> > > > ...
> > > > DOMImplementation domImpl =
> > > > GenericDOMImplementation.getDOMImplementation();
> > > > Document myFactory =
> > > >
domImpl.createDocument(/*null*/SVGDOMImplementation.SVG_NAMESPACE_URI,
> > > > "svg", null);
> > > > SVGGeneratorContext ctx =
> > SVGGeneratorContext.createDefault(myFactory);
> > > >
> > > > ctx.setComment("Generated by Foo");
> > > >
> > > > SVGGraphics2D svgGenerator = new SVGGraphics2D(ctx, false);
> > > > ...
> > > > MyJPanel panel = new MyJPanel();
> > > > ....
> > > > panel.paintComponent(svgGenerator);
> > > > ....
> > > > FileOutputStream fileout = new FileOutputStream(svgFile);
> > > > Writer out = new BufferedWriter(new OutputStreamWriter(fileout,
> > > > "UTF-8"), 131072/*buffersize=128kB*/);
> > > >
> > > > boolean useCSS = false; // CSS style attribute
> > > > svgGenerator.stream(out, useCSS);
> > > > ...
> > >
> >
> --------------------------------------------------------------------------
> > > >
> > > > class MyJPanel extends JPanel {
> > > > ...
> > > > BasicStroke strokeLine = new BasicStroke(thicknessLine,
> > > > BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
> > > > ...
> > > >
> > > > public void paintComponent(Graphics g) {
> > > >
> > > > Graphics2D g2 = (Graphics2D) g;
> > > >
> > > > int maxX = this.getSize().width;
> > > > int maxY = this.getSize().height;
> > > >
> > > > // set white background
> > > > g2.setColor(Color.white);
> > > > g2.fillRect(0, 0, maxX, maxY);
> > > >
> > > > ...
> > > > // loop over ~ 20.000 lines with different colors and
> > strokes
> > > > ...
> > > > g2.setColor(colorLine);
> > > > g2.setStroke(strokeLine);
> > > > g2.draw(new Line2D.Double(line[i].startX,
line[i].startY,
> > > > line[i].endX, line[i].endY));
> > > > ...
> > > > }
> > > > }
> > >
> >
> --------------------------------------------------------------------------
> > > >
> > > > Thanks in advance for any help or tips !!!
> > > >
> > > > Maik Diergardt
> > > > extreme.soft
> > > >
> > > >
> > >
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