SVGUtilities


1   /*
2    * $Id: SVGUtilities.java,v 1.2.2.1 2003/02/25 15:08:11 jeremias Exp $
3    * ============================================================================
4    *                    The Apache Software License, Version 1.1
5    * ============================================================================
6    * 
7    * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
8    * 
9    * Redistribution and use in source and binary forms, with or without modifica-
10   * tion, are permitted provided that the following conditions are met:
11   * 
12   * 1. Redistributions of source code must retain the above copyright notice,
13   *    this list of conditions and the following disclaimer.
14   * 
15   * 2. Redistributions in binary form must reproduce the above copyright notice,
16   *    this list of conditions and the following disclaimer in the documentation
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19   * 3. The end-user documentation included with the redistribution, if any, must
20   *    include the following acknowledgment: "This product includes software
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22   *    Alternately, this acknowledgment may appear in the software itself, if
23   *    and wherever such third-party acknowledgments normally appear.
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25   * 4. The names "FOP" and "Apache Software Foundation" must not be used to
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44   * ============================================================================
45   * 
46   * This software consists of voluntary contributions made by many individuals
47   * on behalf of the Apache Software Foundation and was originally created by
48   * James Tauber <jtauber@jtauber.com>. For more information on the Apache
49   * Software Foundation, please see <http://www.apache.org/>.
50   */ 
51  package org.apache.fop.svg;
52  
53  import java.util.*;
54  import java.awt.geom.AffineTransform  ;
55  import java.awt.geom.Rectangle2D  ;
56  import java.awt.font.FontRenderContext  ;
57  
58  import org.apache.fop.svg.*;
59  import org.w3c.dom.*;
60  
61  import org.apache.batik.dom.svg.SVGDOMImplementation;
62  
63  /**
64   * Some utilities for creating svg DOM documents and elements.
65   */
66  public class SVGUtilities {
67      static final String   svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
68  
69  
70      public static final Document createSVGDocument(float width,
71              float height) {
72          DOMImplementation impl = SVGDOMImplementation.getDOMImplementation();
73          Document doc = impl.createDocument(svgNS, "svg", null);
74  
75          Element svgRoot = doc.getDocumentElement();
76          svgRoot.setAttributeNS(null, "width", "" + width);
77          svgRoot.setAttributeNS(null, "height", "" + height);
78          return doc;
79      }
80  
81      /**
82       * Get the string width for a particular string given the font.
83       */
84      public static final float getStringWidth(String   str, java.awt.Font   font) {
85          Rectangle2D   rect =
86              font.getStringBounds(str, 0, str.length(),
87                                   new FontRenderContext  (new AffineTransform  (),
88                                   true, true));
89          return (float)rect.getWidth();
90      }
91  
92      /**
93       * Get the string height for a particular string given the font.
94       */
95      public static final float getStringHeight(String   str,
96                                                java.awt.Font   font) {
97          Rectangle2D   rect =
98              font.getStringBounds(str, 0, str.length(),
99                                   new FontRenderContext  (new AffineTransform  (),
100                                  true, true));
101         return (float)rect.getHeight();
102     }
103 
104     /**
105      * Get the string bounds for a particular string given the font.
106      */
107     public static final Rectangle2D   getStringBounds(String   str,
108             java.awt.Font   font) {
109         return font.getStringBounds(str, 0, str.length(),
110                                     new FontRenderContext  (new AffineTransform  (),
111                                     true, true));
112     }
113 
114     /**
115      * Create an SVG Line
116      */
117     public static final Element createLine(Document doc, float x, float y,
118                                            float x2, float y2) {
119         Element ellipse = doc.createElementNS(svgNS, "line");
120         ellipse.setAttributeNS(null, "x1", "" + x);
121         ellipse.setAttributeNS(null, "x2", "" + x2);
122         ellipse.setAttributeNS(null, "y1", "" + y);
123         ellipse.setAttributeNS(null, "y2", "" + y2);
124         return ellipse;
125     }
126 
127     /**
128      * Create an SVG Ellipse
129      */
130     public static final Element createEllipse(Document doc, float cx,
131                                               float cy, float rx, float ry) {
132         Element ellipse = doc.createElementNS(svgNS, "ellipse");
133         ellipse.setAttributeNS(null, "cx", "" + cx);
134         ellipse.setAttributeNS(null, "rx", "" + rx);
135         ellipse.setAttributeNS(null, "cy", "" + cy);
136         ellipse.setAttributeNS(null, "ry", "" + ry);
137         return ellipse;
138     }
139 
140     /**
141      * Create an SVG Path.
142      */
143     public static final Element createPath(Document doc, String   str) {
144         Element path = doc.createElementNS(svgNS, "path");
145         path.setAttributeNS(null, "d", str);
146         return path;
147     }
148 
149     /**
150      * Create an SVG Text object.
151      */
152     public static final Element createText(Document doc, float x, float y,
153                                            String   str) {
154         Element textGraph = doc.createElementNS(svgNS, "text");
155         textGraph.setAttributeNS(null, "x", "" + x);
156         textGraph.setAttributeNS(null, "y", "" + y);
157         org.w3c.dom.Text   text = doc.createTextNode(str);
158         textGraph.appendChild(text);
159         return textGraph;
160     }
161 
162     /**
163      * Create an SVG Rectangle.
164      */
165     public static final Element createRect(Document doc, float x, float y,
166                                            float width, float height) {
167         Element border = doc.createElementNS(svgNS, "rect");
168         border.setAttributeNS(null, "x", "" + x);
169         border.setAttributeNS(null, "y", "" + y);
170         border.setAttributeNS(null, "width", "" + width);
171         border.setAttributeNS(null, "height", "" + height);
172         return border;
173     }
174 
175     /**
176      * Create an SVG G.
177      */
178     public static final Element createG(Document doc) {
179         Element border = doc.createElementNS(svgNS, "g");
180         return border;
181     }
182 
183     /**
184      * Create an SVG Clip.
185      */
186     public static final Element createClip(Document doc, Element els,
187                                            String   id) {
188         Element border = doc.createElementNS(svgNS, "clipPath");
189         border.setAttributeNS(null, "id", id);
190         border.appendChild(els);
191         return border;
192     }
193 
194     public static final Element createImage(Document doc, String   ref,
195                                             float width, float height) {
196         Element border = doc.createElementNS(svgNS, "image");
197         border.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href",
198                               ref);
199         border.setAttributeNS(null, "width", "" + width);
200         border.setAttributeNS(null, "height", "" + height);
201         return border;
202     }
203 
204     /**
205      * Create some SVG text that is wrapped into a specified width..
206      */
207     public static final Element wrapText(Document doc, String   str,
208                                          java.awt.Font   font, float width) {
209         Element g = createG(doc);
210         Element text;
211         StringTokenizer st = new StringTokenizer(str, " \t\r\n");
212         float totalWidth = 0;
213         String   totalStr = "";
214         int line = 0;
215         float height = getStringHeight(str, font);
216         while (st.hasMoreTokens()) {
217             String   token = st.nextToken();
218             float strwidth = getStringWidth(token, font);
219             totalWidth += strwidth;
220             if (totalWidth > width) {
221                 if (totalStr.equals("")) {
222                     totalStr = token;
223                     token = "";
224                     strwidth = 0;
225                 }
226                 text = createText(doc, 0, line * (height + 5), totalStr);
227                 g.appendChild(text);
228                 totalStr = token;
229                 totalWidth = strwidth;
230                 line++;
231             } else {
232                 totalStr = totalStr + " " + token;
233             }
234         }
235 
236         return g;
237     }
238 
239 }
240
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