Hi guys,
I am trying to use BATIK to create JPG-images from SVG-DOM-trees which are
retrieved from a directory containing svg-files. The images contain mostly
basic geometric shapes (lines, polylines, circles, rectangles and text). The
following code works just fine, unless it comes to really large pictures -
e.g. 800x3500. As one might expect the engine runs out of memory and the
application crashes.
My question: is there any way to solve this problem or at least find an
acceptable workaround that works also for even bigger images up to about
5000x5000? I am very much looking forward to your answers.
Best regards,
Max Hirschberger
public class ImageGenerator {
public static void createJPEGS(String sourceDir, String targetDir) {
try {
File source = new File(sourceDir);
/*
* Get all SVG-files from the specified directory
*/
String[] svgFiles = source.list(new FilenameFilter() {
public boolean accept(File directory, String
filename) {
if (filename.endsWith(".svg"))
return true;
return false;
}
});
for (int i = 0; i < svgFiles.length; i++) {
int count = svgFiles[i].lastIndexOf(".");
String filename = svgFiles[i].substring(0,
count);
String destination = targetDir + filename +
".jpg";
String destinationThumbnail = targetDir +
filename
+ "_thumbnail.jpg";
String sourceFile = sourceDir + svgFiles[i];
String parser =
XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new
SAXSVGDocumentFactory(parser);
String svgUri = new
File(sourceFile).toURI().toString();
Document doc = f.createDocument(svgUri);
int[] size = getSVGSize(doc);
/*
* Add height and width to the svg so it is
displayed in a
* normal fashion
*/
XMLSupportMethods.addAttribute((Element)
doc.getFirstChild(),
"width",
Integer.toString(size[0]));
XMLSupportMethods.addAttribute((Element)
doc.getFirstChild(),
"height",
Integer.toString(size[1]));
XMLSupportMethods
.storeDocumentToFile(doc, new
File(sourceFile));
/*
* Add area of Interest that determines which
part of the SVG is
* displayed in the JPG; important or tooltip
creation
*/
int aoiSize = Math.min(size[0], size[1]);
Svg2Jpg(doc, new File(destination),
size[0]+100, size[1]+100,
new Rectangle(0, 0,
size[0]+100, size[1]+100));
Svg2Jpg(doc, new File(destinationThumbnail),
120, 150,
new Rectangle(0, 0, aoiSize,
aoiSize
- ((int) 0.2 *
aoiSize)));
}
} catch (TranscoderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Function taking a svg dom and converting it to a jpeg file
* @param document SVG-DOM
* @param destination where to save
* @param width width of JPEG-Image
* @param height height of JPEG-Image
* @param areaOfInterest Determines which Part of the svg will be displayed.
* @throws TranscoderException
* @throws IOException
*/
public static void Svg2Jpg(Document document, File destination, int
width,
int height, Rectangle areaOfInterest) throws
TranscoderException,
IOException {
// Create Transcoder and set its quality and size hints
JPEGTranscoder t = new JPEGTranscoder();
t.addTranscodingHint(JPEGTranscoder.KEY_HEIGHT, new
Float(height));
t.addTranscodingHint(JPEGTranscoder.KEY_WIDTH, new
Float(width));
t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(.8));
t.addTranscodingHint(JPEGTranscoder.KEY_AOI, areaOfInterest);
// Set the transcoder input and output.
TranscoderInput input = new TranscoderInput(document);
OutputStream ostream = new FileOutputStream(destination);
TranscoderOutput output = new TranscoderOutput(ostream);
// Perform the transcoding.
t.transcode(input, output);
ostream.flush();
ostream.close();
}
--
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