Hi
I am trying to generate tiled Jpegs from my SVG but it's generating blank images
My assumption is that
Document doc = domImpl.createDocument(svgNS, "svg", null);
SVGGraphics2D svg = new SVGGraphics2D(doc);
actually means that, when the app draws something in the graphical
context (svg), actually, nodes are being added to the SVG DOM
representation (doc)
but when I try to generate JPEGs from the DOM, all I've got are blank
tiles, while the SVG generation works well.
what am I doing wrong? (please check the code, I've left some comments there)
by the way, just another questions
- Is there a way to save my SVG as a PDF document?
- My SVG can become quite large, so I am afraid a in-memory DOM will
give me a OutOfMemory exception. Is there any workaroud? Like some
sort of file-based structure that can bypass the JVM 32-bit limitation
of addressing about up to (almost) 2 GB in the heap? What's the usual
approach for this?
my code looks like this
//create DOM
DOMImplementation domImpl =
GenericDOMImplementation.getDOMImplementation();
String svgNS = "http://www.w3.org/2000/svg";;
Document doc = domImpl.createDocument(svgNS, "svg", null);
SVGGraphics2D svg = new SVGGraphics2D(doc);
//paint something in the graphical context
paintComponent(svg);
SaveAsJPEGTiles p = new SaveAsJPEGTiles();
int dw2 = documentWidth / 2;
int dh2 = documentHeight / 2;
//generate 4 JPEG tiles - these tiles are being generated with the
right size, but all blank. why?
p.tile(doc, "/tmp/tileTopLeft.jpg", new Rectangle(0, 0, dw2, dh2));
p.tile(doc, "/tmp/tileTopRight.jpg", new Rectangle(dw2, 0, dw2, dh2));
p.tile(doc, "/tmp/tileBottomLeft.jpg", new Rectangle(0, dh2, dw2, dh2));
p.tile(doc, "/tmp/tileBottomRight.jpg", new Rectangle(dw2,
dh2, dw2, dh2));
//then generate the SVG file, this image is being generated successfully
boolean useCSS = true;
FileOutputStream fos = new FileOutputStream(new File("/tmp/mySVG.svg"));
Writer out = new OutputStreamWriter(fos, "UTF-8");
svg.stream(out, useCSS);
//where tile() is
private void tile(org.w3c.dom.Document doc,
String outputFilename,
Rectangle aoi) throws Exception {
trans.addTranscodingHint(JPEGTranscoder.KEY_WIDTH,
new Float(aoi.width));
trans.addTranscodingHint(JPEGTranscoder.KEY_HEIGHT,
new Float(aoi.height));
trans.addTranscodingHint(JPEGTranscoder.KEY_AOI, aoi);
TranscoderInput input = new TranscoderInput(doc);
OutputStream ostream = new FileOutputStream(outputFilename);
TranscoderOutput output = new TranscoderOutput(ostream);
trans.transcode(input, output);
ostream.flush();
ostream.close();
}
thanks in advance
Kenji
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http://kenjiria.blogspot.com
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