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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render;
// Java
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import org.w3c.dom.Document;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.dom.AbstractDocument;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
import org.apache.fop.render.RendererContext.RendererContextWrapper;
import org.apache.fop.svg.SVGEventProducer;
import org.apache.fop.svg.SVGUserAgent;
/**
* Generic XML handler for SVG. Uses Apache Batik for SVG processing and simply paints to
* a Graphics2DAdapter and thus ultimatively to Graphics2D interface that is presented.
* <p>
* To use this class, subclass it and implement the missing methods (supportsRenderer, for example).
*/
public abstract class AbstractGenericSVGHandler implements XMLHandler, RendererContextConstants {
/** logging instance */
protected static Log log = LogFactory.getLog(AbstractGenericSVGHandler.class);
/** {@inheritDoc} */
public void handleXML(RendererContext context,
Document doc, String ns) throws Exception {
if (SVGDOMImplementation.SVG_NAMESPACE_URI.equals(ns)) {
renderSVGDocument(context, doc);
}
}
/**
* Render the SVG document.
* @param context the renderer context
* @param doc the SVG document
* @throws IOException In case of an I/O error while painting the image
*/
protected void renderSVGDocument(final RendererContext context,
final Document doc) throws IOException {
updateRendererContext(context);
final RendererContextWrapper wrappedContext = RendererContext.wrapRendererContext(context);
int x = wrappedContext.getCurrentXPosition();
int y = wrappedContext.getCurrentYPosition();
//Prepare
SVGUserAgent ua = new SVGUserAgent(
context.getUserAgent(),
new AffineTransform());
GVTBuilder builder = new GVTBuilder();
final BridgeContext ctx = new BridgeContext(ua);
//Build the GVT tree
final GraphicsNode root;
try {
root = builder.build(ctx, doc);
} catch (Exception e) {
SVGEventProducer eventProducer = SVGEventProducer.Provider.get(
context.getUserAgent().getEventBroadcaster());
eventProducer.svgNotBuilt(this, e, getDocumentURI(doc));
return;
}
//Create the painter
Graphics2DImagePainter painter = new Graphics2DImagePainter() {
public void paint(Graphics2D g2d, Rectangle2D area) {
// If no viewbox is defined in the svg file, a viewbox of 100x100 is
// assumed, as defined in SVGUserAgent.getViewportSize()
float iw = (float) ctx.getDocumentSize().getWidth();
float ih = (float) ctx.getDocumentSize().getHeight();
float w = (float) area.getWidth();
float h = (float) area.getHeight();
g2d.scale(w / iw, h / ih);
root.paint(g2d);
}
public Dimension getImageSize() {
return new Dimension(wrappedContext.getWidth(), wrappedContext.getHeight());
}
};
//Let the painter paint the SVG on the Graphics2D instance
Graphics2DAdapter adapter = context.getRenderer().getGraphics2DAdapter();
adapter.paintImage(painter, context,
x, y, wrappedContext.getWidth(), wrappedContext.getHeight());
}
/**
* Gets the document URI from a Document instance if possible.
* @param doc the Document
* @return the URI or null
*/
protected String getDocumentURI(Document doc) {
String docURI = null;
if (doc instanceof AbstractDocument) {
AbstractDocument level3Doc = (AbstractDocument)doc;
docURI = level3Doc.getDocumentURI();
}
return docURI;
}
/**
* Override this method to update the renderer context if it needs special settings for
* certain conditions.
* @param context the renderer context
*/
protected void updateRendererContext(RendererContext context) {
//nop
}
/** {@inheritDoc} */
public String getNamespace() {
return SVGDOMImplementation.SVG_NAMESPACE_URI;
}
}
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