Paint SVG to Graphics2D using a GVTBuilder and GraphicsNode

[Demian Gutierrez <pi...@gmail.com>]

Hello to all.

I had the problem of painting a SVG to a Graphics2D. But I needed to
do it with out a JSVGCanvas, JSVGComponent, etc. I had a lot of
problems finding documentation, examples, etc, and finally solved the
problem by my self. This is the code, I hope it may help to others:

public static void main(String[] args) throws Exception {
	SVGDocument document = null;

	// Load the document
	String parser = XMLResourceDescriptor.getXMLParserClassName();
	SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);

	File file = new File(LaMierdaEsta.class.getResource("test.svg").getFile());
	document = (SVGDocument) f.createDocument(file.toURL().toString());

	// Build the tree and get the document dimensions
	UserAgentAdapter userAgentAdapter = new UserAgentAdapter();
	BridgeContext bridgeContext = new BridgeContext(userAgentAdapter);

	GVTBuilder builder = new GVTBuilder();

	GraphicsNode graphicsNode = builder.build(bridgeContext, document);
	CanvasGraphicsNode canvasGraphicsNode = (CanvasGraphicsNode)
graphicsNode.getRoot().getChildren().get(0);

	Rectangle2D bounds = canvasGraphicsNode.getSensitiveBounds();

	// TODO: This is a workaround to solve the problem
	// of the nodes having a clip of size 1
	GVTTreeWalker treeWalker = new GVTTreeWalker(graphicsNode);
	GraphicsNode currNode;

	while ((currNode = treeWalker.nextGraphicsNode()) != null) {
		currNode.setClip(null);
	}

	// XXX: We want to scale 2 in x and 1.5 in y
	double scaleX = 2;
	double scaleY = 1.5;

	graphicsNode.setTransform(AffineTransform.getScaleInstance(scaleX, scaleY));

	// Paint it to a image using a Graphics2D
	BufferedImage bufferedImage = new BufferedImage((int)
(bounds.getWidth() * scaleX), (int) (bounds.getHeight() * scaleY),
BufferedImage.TYPE_INT_RGB);
	Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();

	graphicsNode.paint(g2d);
	g2d.dispose();

	// Write the image to a file
	ImageIO.write(bufferedImage, "png", new File("out.png"));
}

There is a TODO: the problem was that all objects in the tree has
clips with bounds of (0, 0, 1, 1) so the only thing I get first was a
black image only with the pixel at 0, 0 painted. I don't know why all
the clips are this way, y any one knows it please tell me. At least
the workaround works.

Regards, Demián Gutierrez.

PS: I',m very new using batik (a few days) so if you have coments or
suggestions about my code, they are welcomed. :-)

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Re: Paint SVG to Graphics2D using a GVTBuilder and GraphicsNode

[Thomas DeWeese <Th...@Kodak.com>]

Demian Gutierrez wrote:

> There is a TODO: the problem was that all objects in the tree has
> clips with bounds of (0, 0, 1, 1) so the only thing I get first was a
> black image only with the pixel at 0, 0 painted. I don't know why all
> the clips are this way, y any one knows it please tell me. At least
> the workaround works.

     I suspect that this is because you don't set a viewing
transform, and/or because your useragent doesn't provide a
viewport Size.

     You might take a look at the SVGAbstractTranscoder
in org.apache.batik.transcoder, see line 246 where it calculates
the viewing transform and 265 where it puts it on the GVT tree.

> Regards, Demián Gutierrez.
> 
> PS: I',m very new using batik (a few days) so if you have coments or
> suggestions about my code, they are welcomed. :-)

    Over all the code looks pretty good.


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