1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
* 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.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.fop.fo.extensions.ExtensionElementMapping;
import org.apache.fop.render.RendererContext.RendererContextWrapper;
import org.apache.fop.svg.SVGEventProducer;
import org.apache.fop.svg.SVGUserAgent;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
import org.apache.xmlgraphics.util.QName;
import org.w3c.dom.Document;
/**
* 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 {
/** Qualified name for the "conversion-mode" extension attribute. */
protected static final QName CONVERSION_MODE = new QName(
ExtensionElementMapping.URI, null, "conversion-mode");
/** {@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);
//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());
final String uri = getDocumentURI(doc);
eventProducer.svgNotBuilt(this, e, uri);
return;
}
final RendererContextWrapper wrappedContext = RendererContext.wrapRendererContext(context);
//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,
wrappedContext.getCurrentXPosition(),
wrappedContext.getCurrentYPosition(),
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;
}
}
|
