/* * 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; // DOM import org.w3c.dom.Document; // Batik import org.apache.batik.bridge.GVTBuilder; import org.apache.batik.bridge.BridgeContext; import org.apache.batik.dom.svg.SVGDOMImplementation; import org.apache.batik.gvt.GraphicsNode; // FOP import org.apache.fop.render.Graphics2DAdapter; import org.apache.fop.render.Graphics2DImagePainter; import org.apache.fop.render.RendererContextConstants; import org.apache.fop.render.XMLHandler; import org.apache.fop.render.RendererContext; import org.apache.fop.render.RendererContext.RendererContextWrapper; import org.apache.fop.svg.SVGUserAgent; // Commons-Logging import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * 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. *

* To use this class, subclass it and implement the missing methods (supportsRenderer, for example). */ public abstract class AbstractGenericSVGHandler implements XMLHandler, RendererContextConstants { /** logging instance */ private static Log log = LogFactory.getLog(AbstractGenericSVGHandler.class); /** @see org.apache.fop.render.XMLHandler */ 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 { final RendererContextWrapper wrappedContext = RendererContext.wrapRendererContext(context); int x = wrappedContext.getCurrentXPosition(); int y = wrappedContext.getCurrentYPosition(); //Prepare SVGUserAgent ua = new SVGUserAgent( context.getUserAgent().getSourcePixelUnitToMillimeter(), 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) { log.error("SVG graphic could not be built: " + e.getMessage(), e); 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()); } /** @see org.apache.fop.render.XMLHandler#getNamespace() */ public String getNamespace() { return SVGDOMImplementation.SVG_NAMESPACE_URI; } }