Hi Guys :-)
This is more a question for SVG afficionados, but at this point i'll take
any assistance !
I am trying to plumb bits together instead of re-inventing wheels.
My task is to generate thumbnail images from pdf documents.
To this end I have tried both JPedal and Snowbound.
Each has drawbacks (either financial or performance).
So, I have looked at the SVG world.
STEP 1:
I found a (commercial) product , pdfgo, which will convert a PDF to a valid
SVG xml document.
STEP 2a:
I then piped this xml doc thru to Batik.
I used code snippets like this for creating an internal SVGDocument.
It appears to be successful (I can at least read some key elements such as
doc width and height)
<quote>
SVGDocument outDoc = null;
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
try {
outDoc = f.createSVGDocument(null, is);
} catch (Exception e) {
throw new IllegalArgumentException
(e.getMessage());
}
return((SVGDocument)outDoc);
</quote>
STEP 2b:
I looked thru Batik for a thumbnail api but could not find one.
Then, i looked at the ThumbnailDialog class in the Squiggle-App and saw a
snippet which builds a suitable AffineTransform.
I ended up with the code below; you'll see some *strong* similarity to the
batik codebase :-)
You'll notice also that i have left in commented-calls which batik the
ThumbnailDialog class makes.
As soon as i hit the JGVTComponent class, I stopped delving deeper.
Our functionality is a server-side event, so no on-screen images (hence the
potential difficulty with the batik-squiggle code reuse).
And, I am not particularly 2D or SVG savvy.
As i followed the batik code i could see that there are custom event
dispatchers and listeners for a lot of the threaded repainting, so rather
than try to skin this cat, i thought the authors (esp) might be able to help
out :-)
The point i guess is that we have no (backing or thumbnail) image canvas in
our own scope, so.....??
Any soultions or pointers you could offer would be most appreciated :-))
<quote>
protected BufferedImage updateThumbnailRenderingTransform(SVGDocument
svgDocument)
{
if (svgDocument != null)
{
//some thumbnail props i hold internally
ThumbnailProperties tprops = getThumbnailProperties();
Dimension dim = new Dimension(tprops.getWidth(),
tprops.getHeight());
SVGSVGElement root = svgDocument.getRootElement();
AffineTransform Tx = ViewBox.getViewTransform(null, root, dim.width,
dim.height);
if (Tx.isIdentity())
{
String width =
svgDocument.getDocumentElement().getAttribute(SVGConstants.SVG_WIDTH_ATTRIBU
TE);
String height =
svgDocument.getDocumentElement().getAttribute(SVGConstants.SVG_HEIGHT_ATTRIB
UTE);
double sx = dim.width / Integer.parseInt(width);
double sy = dim.height / Integer.parseInt(height);
double s = Math.min(sx, sy);
Tx = AffineTransform.getScaleInstance(s, s);
return(getImage(dim, Tx));
}
// svgThumbnailCanvas.setRenderingTransform(Tx);
// overlay.synchronizeAreaOfInterest();
}
return(null);
}
private BufferedImage getImage(Dimension dim, AffineTransform
paintingTransform)
{
AffineTransform invert = null;
try
{
invert = paintingTransform.createInverse();
}
catch (NoninvertibleTransformException e)
{
log.error(e.getMessage());
}
BufferedImage image = new BufferedImage(dim.width, dim.height,
BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2d = image.createGraphics();
if (image != null)
{
if (paintingTransform != null)
{
g2d.transform(paintingTransform);
}
g2d.drawRenderedImage(image, null);
// Iterator it = overlays.iterator();
// while (it.hasNext()) {
// ((Overlay)it.next()).paint(g);
// }
}
return(image);
}
</quote>
Best Regards & mtia
Julian Salerno
Amcor iSpek Project
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