In case anyone other than me had the same problem here is my solution :), in
short it is a class to make a java.awt.Image from a svg file given by a
java.net.URL or a org.w3c.dom.svg.SVGDocument.
tags: java.awt.BufferedImage Batik Swing
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package javarummikub;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.bridge.UserAgentAdapter;
import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.batik.util.XMLResourceDescriptor;
import org.w3c.dom.Element;
import org.w3c.dom.svg.SVGDocument;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import org.apache.batik.ext.awt.RenderingHintsKeyExt;
/**
* Immutable class to get the Image representation of a svg resource.
*/
public final class SvgImage {
/** Root node of svg document */
private final GraphicsNode rootSvgNode;
/** Loaded SVG document */
private final SVGDocument svgDocument;
/**
* Load the svg resource from a URL into a document.
* @param url location of svg resource.
* @throws java.io.IOException when svg resource cannot be read.
*/
public SvgImage(URL url) throws IOException {
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(parser);
svgDocument =
(SVGDocument) factory.createDocument(url.toString());
rootSvgNode = getRootNode(svgDocument);
}
/**
* Load the svg from a document.
*
* @param document svg resource
*/
public SvgImage(SVGDocument document) {
svgDocument = document;
rootSvgNode = getRootNode(svgDocument);
}
/**
* Get svg root from the given document.
*
* @param document svg resource
*/
private static GraphicsNode getRootNode(SVGDocument document) {
// Build the tree and get the document dimensions
UserAgentAdapter userAgentAdapter = new UserAgentAdapter();
BridgeContext bridgeContext = new BridgeContext(userAgentAdapter);
GVTBuilder builder = new GVTBuilder();
return builder.build(bridgeContext, document);
}
/**
* Get the svg root node of the document.
*
* @return svg root node.
*/
public GraphicsNode getRootSvgNode() {
return rootSvgNode;
}
/**
* Get the svg document.
* @return the svg document.
*/
public SVGDocument getSvgDocument() {
return svgDocument;
}
/**
* Renders and returns the svg based image.
*
* @param width desired width, if it is less than or equal to 0 aspect
* ratio is preserved and the size is determined by height.
* @param height desired height, if it is less than or equal to 0 aspect
* ratio is preserved and the size is determined by width.
* @return image of the rendered svg.'
* TODO: modify to also give a image that preserves aspects but matches
* width or height individually.
*/
public Image getImage(int width, int height) {
/* Adjusts the scale of the transformation below, if either width or
* height is less than or equal to 0 the aspect ratio is preserved.
*/
Element elt = svgDocument.getRootElement();
Rectangle2D bounds = rootSvgNode.getPrimitiveBounds();
double scaleX, scaleY;
if(width <= 0){
scaleX = scaleY = height/bounds.getHeight();
width = (int) (scaleX * bounds.getWidth());
}else if(height <= 0){
scaleX = scaleY = width/bounds.getWidth();
height = (int) (scaleY * bounds.getHeight());
}else{
scaleX = width/bounds.getWidth();
scaleY = height/bounds.getHeight();
}
// Paint svg into image buffer
BufferedImage bufferedImage = new BufferedImage(width,
height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
// For a smooth graphic with no jagged edges or rastorized look.
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHintsKeyExt.KEY_TRANSCODING,
RenderingHintsKeyExt.VALUE_TRANSCODING_PRINTING);
// Scale image to desired size
AffineTransform usr2dev =
new AffineTransform(scaleX, 0.0, 0.0, scaleY, 0.0, 0.0);
g2d.transform(usr2dev);
rootSvgNode.paint(g2d);
// Cleanup and return image
g2d.dispose();
return bufferedImage;
}
}
--
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