skrueger/geotools/LegendIconFeatureRenderer.java

/*******************************************************************************
 * Copyright (c) 2009 Martin O. J. Schmitz.
 * 
 * This file is part of the SCHMITZM library - a collection of utility 
 * classes based on Java 1.6, focusing (not only) on Java Swing 
 * and the Geotools library.
 * 
 * The SCHMITZM project is hosted at:
 * http://wald.intevation.org/projects/schmitzm/
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License (license.txt)
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * or try this link: http://www.gnu.org/licenses/lgpl.html
 * 
 * Contributors:
 *     Martin O. J. Schmitz - initial API and implementation
 *     Stefan A. Tzeggai - additional utility classes
 ******************************************************************************/
/** 
 Copyright 2008 Stefan Alfons Tzeggai and parts from some Geotools code  
 
 atlas-framework - This file is part of the Atlas Framework

 This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
 This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA

 Diese Bibliothek ist freie Software; Sie dürfen sie unter den Bedingungen der GNU Lesser General Public License, wie von der Free Software Foundation veröffentlicht, weiterverteilen und/oder modifizieren; entweder gemäß Version 2.1 der Lizenz oder (nach Ihrer Option) jeder späteren Version.
 Diese Bibliothek wird in der Hoffnung weiterverbreitet, daß sie nützlich sein wird, jedoch OHNE IRGENDEINE GARANTIE, auch ohne die implizierte Garantie der MARKTREIFE oder der VERWENDBARKEIT FÜR EINEN BESTIMMTEN ZWECK. Mehr Details finden Sie in der GNU Lesser General Public License.
 Sie sollten eine Kopie der GNU Lesser General Public License zusammen mit dieser Bibliothek erhalten haben; falls nicht, schreiben Sie an die Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA.
 **/
package skrueger.geotools;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;

import javax.swing.tree.DefaultTreeCellRenderer;

import org.apache.log4j.Logger;
import org.geotools.factory.GeoTools;
import org.geotools.factory.Hints;
import org.geotools.feature.IllegalAttributeException;
import org.geotools.geometry.jts.LiteShape2;
import org.geotools.renderer.lite.StyledShapePainter;
import org.geotools.renderer.style.SLDStyleFactory;
import org.geotools.renderer.style.Style2D;
import org.geotools.styling.LineSymbolizer;
import org.geotools.styling.PointSymbolizer;
import org.geotools.styling.PolygonSymbolizer;
import org.geotools.styling.RasterSymbolizer;
import org.geotools.styling.Rule;
import org.geotools.styling.Style;
import org.geotools.styling.Symbolizer;
import org.geotools.styling.TextSymbolizer;
import org.geotools.util.NumberRange;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;

import schmitzm.geotools.feature.FeatureUtil;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Polygon;

/**
 * Based on geoserver!
 * <hr>
 * <b>Changes by <a href="mailto:[email protected]">Martin Schmitz</a></b>
 * <br>
 * <ul>
 * <li>07.02.2008:<br>
 * Determining the default values of a {@link SimpleFeatureType} by
 * {@link FeatureUtil#getDefaultAttributeValues(SimpleFeatureType)} instead of using
 * {@link AttributeDescriptor#createDefaultValue()} directly, because the latter
 * returns {@code null} even though the attribut is not nillable.</li>
 * </ul>
 * 
 * @author Stefan Alfons Tzeggai
 */
public class LegendIconFeatureRenderer extends DefaultTreeCellRenderer {
//      private static final Dimension SIZE = new Dimension(30,20);

        Logger LOGGER = Logger.getLogger(LegendIconFeatureRenderer.class);

        /**
         * This is a static class
         */
        private LegendIconFeatureRenderer() {
        }

        final static LegendIconFeatureRenderer instance = new LegendIconFeatureRenderer();

        public static LegendIconFeatureRenderer getInstance() {
                // In GT 2.4.5 it we have to create a new one all the time!
                
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                // TODO TEST, whether we still need to recreate the renderer here....
                return new LegendIconFeatureRenderer();
//               return instance;
        }

        /**
         * used to create sample point shapes with LiteShape (not lines nor
         * polygons)
         */
        private static final GeometryFactory geomFac = FeatureUtil.GEOMETRY_FACTORY;

        /** padding percentage factor at both sides of the legend. */
        private static final float hpaddingFactor = 0.11f; // was 0.15

        /** top & bottom padding percentage factor for the legend */
        private static final float vpaddingFactor = 0.08f; // was 0.15

        /**
         * Just a holder to avoid creating many polygon shapes from inside
         * <code>getSampleShape()</code>
         */
        private LiteShape2 sampleRect;

        /**
         * Just a holder to avoid creating many line shapes from inside
         * <code>getSampleShape()</code>
         */
        private LiteShape2 sampleLine;

        /**
         * Just a holder to avoid creating many point shapes from inside
         * <code>getSampleShape()</code>
         */
        private LiteShape2 samplePoint;

        private Hints hints;

        /**
         * Returns a <code>java.awt.Shape</code> appropiate to render a legend
         * graphic given the symbolizer type and the legend dimensions.
         * 
         * @param symbolizer
         *            the Symbolizer for whose type a sample shape will be created
         * @param legendWidth
         *            the requested width, in output units, of the legend graphic
         * @param legendHeight
         *            the requested height, in output units, of the legend graphic
         * 
         * @return an appropiate Line2D, Rectangle2D or LiteShape(Point) for the
         *         symbolizer, wether it is a LineSymbolizer, a PolygonSymbolizer,
         *         or a Point ot Text Symbolizer
         * 
         * @throws IllegalArgumentException
         *             if an unknown symbolizer impl was passed in.
         */
        private LiteShape2 getSampleShape(Symbolizer symbolizer, int legendWidth,
                        int legendHeight) {
                LiteShape2 sampleShape;
                final float hpad = (legendWidth * hpaddingFactor);
                final float vpad = (legendHeight * vpaddingFactor);

                if (symbolizer instanceof LineSymbolizer) {
                        if (this.sampleLine == null) {
                                Coordinate[] coords = {
                                                new Coordinate(hpad, legendHeight - vpad),
                                                new Coordinate(legendWidth - hpad, vpad) };
                                LineString geom = geomFac.createLineString(coords);

                                try {
                                        this.sampleLine = new LiteShape2(geom, null, null, false);
                                } catch (Exception e) {
                                        this.sampleLine = null;
                                }
                        }

                        sampleShape = this.sampleLine;
                } else if ((symbolizer instanceof PolygonSymbolizer)
                                || (symbolizer instanceof RasterSymbolizer)) {
                        if (this.sampleRect == null) {
                                final float w = legendWidth - (2 * hpad);
                                final float h = legendHeight - (2 * vpad);

                                Coordinate[] coords = { new Coordinate(hpad, vpad),
                                                new Coordinate(hpad, vpad + h),
                                                new Coordinate(hpad + w, vpad + h),
                                                new Coordinate(hpad + w, vpad),
                                                new Coordinate(hpad, vpad) };
                                LinearRing shell = geomFac.createLinearRing(coords);
                                Polygon geom = geomFac.createPolygon(shell, null);

                                try {
                                        this.sampleRect = new LiteShape2(geom, null, null, false);
                                } catch (Exception e) {
                                        this.sampleRect = null;
                                }
                        }

                        sampleShape = this.sampleRect;
                } else if (symbolizer instanceof PointSymbolizer
                                || symbolizer instanceof TextSymbolizer) {
                        if (this.samplePoint == null) {
                                Coordinate coord = new Coordinate(legendWidth / 2,
                                                legendHeight / 2);

                                try {
                                        this.samplePoint = new LiteShape2(geomFac
                                                        .createPoint(coord), null, null, false);
                                } catch (Exception e) {
                                        this.samplePoint = null;
                                }
                        }

                        sampleShape = this.samplePoint;
                } else {
                        throw new IllegalArgumentException("Unknown symbolizer: "
                                        + symbolizer);
                }
                return sampleShape;
        }
        
        /**
         * Creates a little BufferedImage that presents the Style/Symbols used by
         * the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
         * 
         * @param rule
         *            {@link Rule} that provides the text and the style to present
         * @param featureType
         *            Schema that describes the kind of the sample {@link SimpleFeature}
         *            that will be rendered with the {@link Style}
         * @param bg
         *            Background {@link Color} or <code>null</code>
         * 
         * @throws IllegalAttributeException
         */
        public BufferedImage createImageForRule(Rule rule, SimpleFeatureType featureType,
                        Dimension size, Color bg) {

                Symbolizer[] symbolizers = rule.getSymbolizers();

                BufferedImage buffImage = new BufferedImage(size.width, size.height,
                                BufferedImage.TYPE_INT_ARGB);
                Graphics2D graphics = buffImage.createGraphics();

                if (bg != null) {
                        // ****************************************************************************
                        // The following lines define the background color for the rendered
                        // images
                        // ****************************************************************************
                        graphics.setBackground(bg);
                        graphics.setColor(bg);
                        graphics.fillRect(0, 0, size.width, size.height);
                }

                // Enable anti-aliasing for the legend symbols
                graphics.setRenderingHints(getHints());

                final NumberRange<Integer> scaleRange = NumberRange.create(Integer.MAX_VALUE,Integer.MAX_VALUE);

                try {

                        for (int sIdx = 0; sIdx < symbolizers.length; sIdx++) {
                                Symbolizer symbolizer = symbolizers[sIdx];

                                if (symbolizer instanceof TextSymbolizer) {
                                        continue;
                                }

                                // if (symbolizer instanceof RasterSymbolizer) {
                                // log.warn("createImageForRule method can't be used for
                                // RasterSymbolizers..");
                                // }
                                // else
                                final SimpleFeature sampleFeature = FeatureUtil.createSampleFeature(featureType);

                                // The SLDStyleFactory has to be recreated, as it seams to cache
                                // some stuff.
                                SLDStyleFactory sldStyleFactory = new SLDStyleFactory();
                                Style2D style2d = sldStyleFactory.createStyle(sampleFeature,
                                                symbolizer, scaleRange);

                                LiteShape2 shape = getSampleShape(symbolizer, size.width,
                                                size.height);

                                if (style2d != null) {
                                        new StyledShapePainter(null).paint(graphics, shape,
                                                        style2d, Integer.MAX_VALUE );
                                }
                        }
                } catch (Exception e) {
                        LOGGER
                                        .error(
                                                        "Error during createImageForRule, returning empty Image",
                                                        e);
                }
                return buffImage;
        }

        /**
         * Define Java2D and other Hints
         * 
         * @param hints
         * @author <a href="mailto:[email protected]">Stefan Alfons
         *         Tzeggai</a>
         */
        public void setHints(Hints hints) {
                getHints().add(hints);
        }

        private Hints getHints() {
                if (hints == null) {
                        hints = GeoTools.getDefaultHints();
                        hints.put(RenderingHints.KEY_ANTIALIASING,
                                        RenderingHints.VALUE_ANTIALIAS_ON);
                        hints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
                                        RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
                        hints.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
                                        RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
                        hints.put(RenderingHints.KEY_RENDERING,
                                        RenderingHints.VALUE_RENDER_QUALITY);
                        hints.put(RenderingHints.KEY_COLOR_RENDERING,
                                        RenderingHints.VALUE_COLOR_RENDER_QUALITY);
                }
                return hints;
        }

        /**
         * Creates a little BufferedImage that presents the Style/Symbols used by
         * the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
         * 
         * @param rule
         *            {@link Rule} that provides the text and the style to present
         * @param featureType
         *            Schema that describes the kind of the sample {@link SimpleFeature}
         *            that will be rendered with the {@link Style}
         * 
         * @throws IllegalAttributeException
         */
        public BufferedImage createImageForRule(final Rule rule,
                        final SimpleFeatureType featureType, final Dimension size) {
                return createImageForRule(rule, featureType, size, null);
        }

}
1	/*******************************************************************************
2	* Copyright (c) 2009 Martin O. J. Schmitz.
3	*
4	* This file is part of the SCHMITZM library - a collection of utility
5	* classes based on Java 1.6, focusing (not only) on Java Swing
6	* and the Geotools library.
7	*
8	* The SCHMITZM project is hosted at:
9	* http://wald.intevation.org/projects/schmitzm/
10	*
11	* This program is free software; you can redistribute it and/or
12	* modify it under the terms of the GNU Lesser General Public License
13	* as published by the Free Software Foundation; either version 3
14	* of the License, or (at your option) any later version.
15	*
16	* This program is distributed in the hope that it will be useful,
17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19	* GNU General Public License for more details.
20	*
21	* You should have received a copy of the GNU Lesser General Public License (license.txt)
22	* along with this program; if not, write to the Free Software
23	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24	* or try this link: http://www.gnu.org/licenses/lgpl.html
25	*
26	* Contributors:
27	* Martin O. J. Schmitz - initial API and implementation
28	* Stefan A. Tzeggai - additional utility classes
29	******************************************************************************/
30	/**
31	Copyright 2008 Stefan Alfons Tzeggai and parts from some Geotools code
32
33	atlas-framework - This file is part of the Atlas Framework
34
35	This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
36	This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
37	You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
38
39	Diese Bibliothek ist freie Software; Sie dürfen sie unter den Bedingungen der GNU Lesser General Public License, wie von der Free Software Foundation veröffentlicht, weiterverteilen und/oder modifizieren; entweder gemäß Version 2.1 der Lizenz oder (nach Ihrer Option) jeder späteren Version.
40	Diese Bibliothek wird in der Hoffnung weiterverbreitet, daß sie nützlich sein wird, jedoch OHNE IRGENDEINE GARANTIE, auch ohne die implizierte Garantie der MARKTREIFE oder der VERWENDBARKEIT FÜR EINEN BESTIMMTEN ZWECK. Mehr Details finden Sie in der GNU Lesser General Public License.
41	Sie sollten eine Kopie der GNU Lesser General Public License zusammen mit dieser Bibliothek erhalten haben; falls nicht, schreiben Sie an die Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA.
42	**/
43	package skrueger.geotools;
44
45	import java.awt.Color;
46	import java.awt.Dimension;
47	import java.awt.Graphics2D;
48	import java.awt.RenderingHints;
49	import java.awt.image.BufferedImage;
50
51	import javax.swing.tree.DefaultTreeCellRenderer;
52
53	import org.apache.log4j.Logger;
54	import org.geotools.factory.GeoTools;
55	import org.geotools.factory.Hints;
56	import org.geotools.feature.IllegalAttributeException;
57	import org.geotools.geometry.jts.LiteShape2;
58	import org.geotools.renderer.lite.StyledShapePainter;
59	import org.geotools.renderer.style.SLDStyleFactory;
60	import org.geotools.renderer.style.Style2D;
61	import org.geotools.styling.LineSymbolizer;
62	import org.geotools.styling.PointSymbolizer;
63	import org.geotools.styling.PolygonSymbolizer;
64	import org.geotools.styling.RasterSymbolizer;
65	import org.geotools.styling.Rule;
66	import org.geotools.styling.Style;
67	import org.geotools.styling.Symbolizer;
68	import org.geotools.styling.TextSymbolizer;
69	import org.geotools.util.NumberRange;
70	import org.opengis.feature.simple.SimpleFeature;
71	import org.opengis.feature.simple.SimpleFeatureType;
72	import org.opengis.feature.type.AttributeDescriptor;
73
74	import schmitzm.geotools.feature.FeatureUtil;
75
76	import com.vividsolutions.jts.geom.Coordinate;
77	import com.vividsolutions.jts.geom.GeometryFactory;
78	import com.vividsolutions.jts.geom.LineString;
79	import com.vividsolutions.jts.geom.LinearRing;
80	import com.vividsolutions.jts.geom.Polygon;
81
82	/**
83	* Based on geoserver!
84	* <hr>
85	* <b>Changes by <a href="mailto:[email protected]">Martin Schmitz</a></b>
86	* <br>
87	* <ul>
88	* <li>07.02.2008:<br>
89	* Determining the default values of a {@link SimpleFeatureType} by
90	* {@link FeatureUtil#getDefaultAttributeValues(SimpleFeatureType)} instead of using
91	* {@link AttributeDescriptor#createDefaultValue()} directly, because the latter
92	* returns {@code null} even though the attribut is not nillable.</li>
93	* </ul>
94	*
95	* @author Stefan Alfons Tzeggai
96	*/
97	public class LegendIconFeatureRenderer extends DefaultTreeCellRenderer {
98	// private static final Dimension SIZE = new Dimension(30,20);
99
100	Logger LOGGER = Logger.getLogger(LegendIconFeatureRenderer.class);
101
102	/**
103	* This is a static class
104	*/
105	private LegendIconFeatureRenderer() {
106	}
107
108	final static LegendIconFeatureRenderer instance = new LegendIconFeatureRenderer();
109
110	public static LegendIconFeatureRenderer getInstance() {
111	// In GT 2.4.5 it we have to create a new one all the time!
112
113	// TODO TEST, whether we still need to recreate the renderer here....
114	// TODO TEST, whether we still need to recreate the renderer here....
115	// TODO TEST, whether we still need to recreate the renderer here....
116	// TODO TEST, whether we still need to recreate the renderer here....
117	// TODO TEST, whether we still need to recreate the renderer here....
118	// TODO TEST, whether we still need to recreate the renderer here....
119	// TODO TEST, whether we still need to recreate the renderer here....
120	// TODO TEST, whether we still need to recreate the renderer here....
121	return new LegendIconFeatureRenderer();
122	// return instance;
123	}
124
125	/**
126	* used to create sample point shapes with LiteShape (not lines nor
127	* polygons)
128	*/
129	private static final GeometryFactory geomFac = FeatureUtil.GEOMETRY_FACTORY;
130
131	/** padding percentage factor at both sides of the legend. */
132	private static final float hpaddingFactor = 0.11f; // was 0.15
133
134	/** top & bottom padding percentage factor for the legend */
135	private static final float vpaddingFactor = 0.08f; // was 0.15
136
137	/**
138	* Just a holder to avoid creating many polygon shapes from inside
139	* <code>getSampleShape()</code>
140	*/
141	private LiteShape2 sampleRect;
142
143	/**
144	* Just a holder to avoid creating many line shapes from inside
145	* <code>getSampleShape()</code>
146	*/
147	private LiteShape2 sampleLine;
148
149	/**
150	* Just a holder to avoid creating many point shapes from inside
151	* <code>getSampleShape()</code>
152	*/
153	private LiteShape2 samplePoint;
154
155	private Hints hints;
156
157	/**
158	* Returns a <code>java.awt.Shape</code> appropiate to render a legend
159	* graphic given the symbolizer type and the legend dimensions.
160	*
161	* @param symbolizer
162	* the Symbolizer for whose type a sample shape will be created
163	* @param legendWidth
164	* the requested width, in output units, of the legend graphic
165	* @param legendHeight
166	* the requested height, in output units, of the legend graphic
167	*
168	* @return an appropiate Line2D, Rectangle2D or LiteShape(Point) for the
169	* symbolizer, wether it is a LineSymbolizer, a PolygonSymbolizer,
170	* or a Point ot Text Symbolizer
171	*
172	* @throws IllegalArgumentException
173	* if an unknown symbolizer impl was passed in.
174	*/
175	private LiteShape2 getSampleShape(Symbolizer symbolizer, int legendWidth,
176	int legendHeight) {
177	LiteShape2 sampleShape;
178	final float hpad = (legendWidth * hpaddingFactor);
179	final float vpad = (legendHeight * vpaddingFactor);
180
181	if (symbolizer instanceof LineSymbolizer) {
182	if (this.sampleLine == null) {
183	Coordinate[] coords = {
184	new Coordinate(hpad, legendHeight - vpad),
185	new Coordinate(legendWidth - hpad, vpad) };
186	LineString geom = geomFac.createLineString(coords);
187
188	try {
189	this.sampleLine = new LiteShape2(geom, null, null, false);
190	} catch (Exception e) {
191	this.sampleLine = null;
192	}
193	}
194
195	sampleShape = this.sampleLine;
196	} else if ((symbolizer instanceof PolygonSymbolizer)
197	\|\| (symbolizer instanceof RasterSymbolizer)) {
198	if (this.sampleRect == null) {
199	final float w = legendWidth - (2 * hpad);
200	final float h = legendHeight - (2 * vpad);
201
202	Coordinate[] coords = { new Coordinate(hpad, vpad),
203	new Coordinate(hpad, vpad + h),
204	new Coordinate(hpad + w, vpad + h),
205	new Coordinate(hpad + w, vpad),
206	new Coordinate(hpad, vpad) };
207	LinearRing shell = geomFac.createLinearRing(coords);
208	Polygon geom = geomFac.createPolygon(shell, null);
209
210	try {
211	this.sampleRect = new LiteShape2(geom, null, null, false);
212	} catch (Exception e) {
213	this.sampleRect = null;
214	}
215	}
216
217	sampleShape = this.sampleRect;
218	} else if (symbolizer instanceof PointSymbolizer
219	\|\| symbolizer instanceof TextSymbolizer) {
220	if (this.samplePoint == null) {
221	Coordinate coord = new Coordinate(legendWidth / 2,
222	legendHeight / 2);
223
224	try {
225	this.samplePoint = new LiteShape2(geomFac
226	.createPoint(coord), null, null, false);
227	} catch (Exception e) {
228	this.samplePoint = null;
229	}
230	}
231
232	sampleShape = this.samplePoint;
233	} else {
234	throw new IllegalArgumentException("Unknown symbolizer: "
235	+ symbolizer);
236	}
237	return sampleShape;
238	}
239
240	/**
241	* Creates a little BufferedImage that presents the Style/Symbols used by
242	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
243	*
244	* @param rule
245	* {@link Rule} that provides the text and the style to present
246	* @param featureType
247	* Schema that describes the kind of the sample {@link SimpleFeature}
248	* that will be rendered with the {@link Style}
249	* @param bg
250	* Background {@link Color} or <code>null</code>
251	*
252	* @throws IllegalAttributeException
253	*/
254	public BufferedImage createImageForRule(Rule rule, SimpleFeatureType featureType,
255	Dimension size, Color bg) {
256
257	Symbolizer[] symbolizers = rule.getSymbolizers();
258
259	BufferedImage buffImage = new BufferedImage(size.width, size.height,
260	BufferedImage.TYPE_INT_ARGB);
261	Graphics2D graphics = buffImage.createGraphics();
262
263	if (bg != null) {
264	// ****************************************************************************
265	// The following lines define the background color for the rendered
266	// images
267	// ****************************************************************************
268	graphics.setBackground(bg);
269	graphics.setColor(bg);
270	graphics.fillRect(0, 0, size.width, size.height);
271	}
272
273	// Enable anti-aliasing for the legend symbols
274	graphics.setRenderingHints(getHints());
275
276	final NumberRange<Integer> scaleRange = NumberRange.create(Integer.MAX_VALUE,Integer.MAX_VALUE);
277
278	try {
279
280	for (int sIdx = 0; sIdx < symbolizers.length; sIdx++) {
281	Symbolizer symbolizer = symbolizers[sIdx];
282
283	if (symbolizer instanceof TextSymbolizer) {
284	continue;
285	}
286
287	// if (symbolizer instanceof RasterSymbolizer) {
288	// log.warn("createImageForRule method can't be used for
289	// RasterSymbolizers..");
290	// }
291	// else
292	final SimpleFeature sampleFeature = FeatureUtil.createSampleFeature(featureType);
293
294	// The SLDStyleFactory has to be recreated, as it seams to cache
295	// some stuff.
296	SLDStyleFactory sldStyleFactory = new SLDStyleFactory();
297	Style2D style2d = sldStyleFactory.createStyle(sampleFeature,
298	symbolizer, scaleRange);
299
300	LiteShape2 shape = getSampleShape(symbolizer, size.width,
301	size.height);
302
303	if (style2d != null) {
304	new StyledShapePainter(null).paint(graphics, shape,
305	style2d, Integer.MAX_VALUE );
306	}
307	}
308	} catch (Exception e) {
309	LOGGER
310	.error(
311	"Error during createImageForRule, returning empty Image",
312	e);
313	}
314	return buffImage;
315	}
316
317	/**
318	* Define Java2D and other Hints
319	*
320	* @param hints
321	* @author <a href="mailto:[email protected]">Stefan Alfons
322	* Tzeggai</a>
323	*/
324	public void setHints(Hints hints) {
325	getHints().add(hints);
326	}
327
328	private Hints getHints() {
329	if (hints == null) {
330	hints = GeoTools.getDefaultHints();
331	hints.put(RenderingHints.KEY_ANTIALIASING,
332	RenderingHints.VALUE_ANTIALIAS_ON);
333	hints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
334	RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
335	hints.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
336	RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
337	hints.put(RenderingHints.KEY_RENDERING,
338	RenderingHints.VALUE_RENDER_QUALITY);
339	hints.put(RenderingHints.KEY_COLOR_RENDERING,
340	RenderingHints.VALUE_COLOR_RENDER_QUALITY);
341	}
342	return hints;
343	}
344
345	/**
346	* Creates a little BufferedImage that presents the Style/Symbols used by
347	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
348	*
349	* @param rule
350	* {@link Rule} that provides the text and the style to present
351	* @param featureType
352	* Schema that describes the kind of the sample {@link SimpleFeature}
353	* that will be rendered with the {@link Style}
354	*
355	* @throws IllegalAttributeException
356	*/
357	public BufferedImage createImageForRule(final Rule rule,
358	final SimpleFeatureType featureType, final Dimension size) {
359	return createImageForRule(rule, featureType, size, null);
360	}
361
362	}