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 org.apache.log4j.Logger;
import org.geotools.factory.GeoTools;
import org.geotools.factory.Hints;
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.IllegalAttributeException;
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>
 * <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 {
        // private static final Dimension SIZE = new Dimension(30,20);

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

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

        /**
         * We have to return new instances here. Otherwise the sample features are
         * not recreated and the sizes of the previews are locaked to the size of
         * the first request.
         */
        public static LegendIconFeatureRenderer getInstance() {
                return new LegendIconFeatureRenderer();
        }

        /**
         * 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> appropriate 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
         * 
         */
        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);

                                if (sampleFeature == null)
                                        LOGGER.debug("sampleFeature " + sampleFeature);

                                // 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) {
                                        StyledShapePainter styledShapePainter = new StyledShapePainter(
                                                        null);
                                        styledShapePainter.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 org.apache.log4j.Logger;
52	import org.geotools.factory.GeoTools;
53	import org.geotools.factory.Hints;
54	import org.geotools.geometry.jts.LiteShape2;
55	import org.geotools.renderer.lite.StyledShapePainter;
56	import org.geotools.renderer.style.SLDStyleFactory;
57	import org.geotools.renderer.style.Style2D;
58	import org.geotools.styling.LineSymbolizer;
59	import org.geotools.styling.PointSymbolizer;
60	import org.geotools.styling.PolygonSymbolizer;
61	import org.geotools.styling.RasterSymbolizer;
62	import org.geotools.styling.Rule;
63	import org.geotools.styling.Style;
64	import org.geotools.styling.Symbolizer;
65	import org.geotools.styling.TextSymbolizer;
66	import org.geotools.util.NumberRange;
67	import org.opengis.feature.IllegalAttributeException;
68	import org.opengis.feature.simple.SimpleFeature;
69	import org.opengis.feature.simple.SimpleFeatureType;
70	import org.opengis.feature.type.AttributeDescriptor;
71
72	import schmitzm.geotools.feature.FeatureUtil;
73
74	import com.vividsolutions.jts.geom.Coordinate;
75	import com.vividsolutions.jts.geom.GeometryFactory;
76	import com.vividsolutions.jts.geom.LineString;
77	import com.vividsolutions.jts.geom.LinearRing;
78	import com.vividsolutions.jts.geom.Polygon;
79
80	/**
81	* Based on geoserver!
82	* <hr>
83	* <b>Changes by <a href="mailto:[email protected]">Martin Schmitz</a></b>
84	* <li>07.02.2008:<br>
85	* Determining the default values of a {@link SimpleFeatureType} by
86	* {@link FeatureUtil#getDefaultAttributeValues(SimpleFeatureType)} instead of
87	* using {@link AttributeDescriptor#createDefaultValue()} directly, because the
88	* latter returns {@code null} even though the attribut is not nillable.</li>
89	* </ul>
90	*
91	* @author Stefan Alfons Tzeggai
92	*/
93	public class LegendIconFeatureRenderer {
94	// private static final Dimension SIZE = new Dimension(30,20);
95
96	Logger LOGGER = Logger.getLogger(LegendIconFeatureRenderer.class);
97
98	/**
99	* This is a static class
100	*/
101	private LegendIconFeatureRenderer() {
102	}
103
104	/**
105	* We have to return new instances here. Otherwise the sample features are
106	* not recreated and the sizes of the previews are locaked to the size of
107	* the first request.
108	*/
109	public static LegendIconFeatureRenderer getInstance() {
110	return new LegendIconFeatureRenderer();
111	}
112
113	/**
114	* used to create sample point shapes with LiteShape (not lines nor
115	* polygons)
116	*/
117	private static final GeometryFactory geomFac = FeatureUtil.GEOMETRY_FACTORY;
118
119	/** padding percentage factor at both sides of the legend. */
120	private static final float hpaddingFactor = 0.11f; // was 0.15
121
122	/** top & bottom padding percentage factor for the legend */
123	private static final float vpaddingFactor = 0.08f; // was 0.15
124
125	/**
126	* Just a holder to avoid creating many polygon shapes from inside
127	* <code>getSampleShape()</code>
128	*/
129	private LiteShape2 sampleRect;
130
131	/**
132	* Just a holder to avoid creating many line shapes from inside
133	* <code>getSampleShape()</code>
134	*/
135	private LiteShape2 sampleLine;
136
137	/**
138	* Just a holder to avoid creating many point shapes from inside
139	* <code>getSampleShape()</code>
140	*/
141	private LiteShape2 samplePoint;
142
143	private Hints hints;
144
145	/**
146	* Returns a <code>java.awt.Shape</code> appropriate to render a legend
147	* graphic given the symbolizer type and the legend dimensions.
148	*
149	* @param symbolizer
150	* the Symbolizer for whose type a sample shape will be created
151	* @param legendWidth
152	* the requested width, in output units, of the legend graphic
153	* @param legendHeight
154	* the requested height, in output units, of the legend graphic
155	*
156	* @return an appropiate Line2D, Rectangle2D or LiteShape(Point) for the
157	* symbolizer, wether it is a LineSymbolizer, a PolygonSymbolizer,
158	* or a Point ot Text Symbolizer
159	*
160	*/
161	private LiteShape2 getSampleShape(Symbolizer symbolizer, int legendWidth,
162	int legendHeight) {
163	LiteShape2 sampleShape;
164	final float hpad = (legendWidth * hpaddingFactor);
165	final float vpad = (legendHeight * vpaddingFactor);
166
167	if (symbolizer instanceof LineSymbolizer) {
168	if (this.sampleLine == null) {
169	Coordinate[] coords = {
170	new Coordinate(hpad, legendHeight - vpad),
171	new Coordinate(legendWidth - hpad, vpad) };
172	LineString geom = geomFac.createLineString(coords);
173
174	try {
175	this.sampleLine = new LiteShape2(geom, null, null, false);
176	} catch (Exception e) {
177	this.sampleLine = null;
178	}
179	}
180
181	sampleShape = this.sampleLine;
182	} else if ((symbolizer instanceof PolygonSymbolizer)
183	\|\| (symbolizer instanceof RasterSymbolizer)) {
184	if (this.sampleRect == null) {
185	final float w = legendWidth - (2 * hpad);
186	final float h = legendHeight - (2 * vpad);
187
188	Coordinate[] coords = { new Coordinate(hpad, vpad),
189	new Coordinate(hpad, vpad + h),
190	new Coordinate(hpad + w, vpad + h),
191	new Coordinate(hpad + w, vpad),
192	new Coordinate(hpad, vpad) };
193	LinearRing shell = geomFac.createLinearRing(coords);
194	Polygon geom = geomFac.createPolygon(shell, null);
195
196	try {
197	this.sampleRect = new LiteShape2(geom, null, null, false);
198	} catch (Exception e) {
199	this.sampleRect = null;
200	}
201	}
202
203	sampleShape = this.sampleRect;
204	} else if (symbolizer instanceof PointSymbolizer
205	\|\| symbolizer instanceof TextSymbolizer) {
206	if (this.samplePoint == null) {
207	Coordinate coord = new Coordinate(legendWidth / 2,
208	legendHeight / 2);
209
210	try {
211	this.samplePoint = new LiteShape2(
212	geomFac.createPoint(coord), null, null, false);
213	} catch (Exception e) {
214	this.samplePoint = null;
215	}
216	}
217
218	sampleShape = this.samplePoint;
219	} else {
220	throw new IllegalArgumentException("Unknown symbolizer: "
221	+ symbolizer);
222	}
223	return sampleShape;
224	}
225
226	/**
227	* Creates a little BufferedImage that presents the Style/Symbols used by
228	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
229	*
230	* @param rule
231	* {@link Rule} that provides the text and the style to present
232	* @param featureType
233	* Schema that describes the kind of the sample
234	* {@link SimpleFeature} that will be rendered with the
235	* {@link Style}
236	* @param bg
237	* Background {@link Color} or <code>null</code>
238	*
239	* @throws IllegalAttributeException
240	*/
241	public BufferedImage createImageForRule(Rule rule,
242	SimpleFeatureType featureType, Dimension size, Color bg) {
243
244	Symbolizer[] symbolizers = rule.getSymbolizers();
245
246	BufferedImage buffImage = new BufferedImage(size.width, size.height,
247	BufferedImage.TYPE_INT_ARGB);
248	Graphics2D graphics = buffImage.createGraphics();
249
250	if (bg != null) {
251	// ****************************************************************************
252	// The following lines define the background color for the rendered
253	// images
254	// ****************************************************************************
255	graphics.setBackground(bg);
256	graphics.setColor(bg);
257	graphics.fillRect(0, 0, size.width, size.height);
258	}
259
260	// Enable anti-aliasing for the legend symbols
261	graphics.setRenderingHints(getHints());
262
263	final NumberRange<Integer> scaleRange = NumberRange.create(
264	Integer.MAX_VALUE, Integer.MAX_VALUE);
265
266	try {
267
268	for (int sIdx = 0; sIdx < symbolizers.length; sIdx++) {
269	Symbolizer symbolizer = symbolizers[sIdx];
270
271	if (symbolizer instanceof TextSymbolizer) {
272	continue;
273	}
274
275	// if (symbolizer instanceof RasterSymbolizer) {
276	// log.warn("createImageForRule method can't be used for
277	// RasterSymbolizers..");
278	// }
279	// else
280	final SimpleFeature sampleFeature = FeatureUtil
281	.createSampleFeature(featureType);
282
283	if (sampleFeature == null)
284	LOGGER.debug("sampleFeature " + sampleFeature);
285
286	// The SLDStyleFactory has to be recreated, as it seams to cache
287	// some stuff.
288	SLDStyleFactory sldStyleFactory = new SLDStyleFactory();
289	Style2D style2d = sldStyleFactory.createStyle(sampleFeature,
290	symbolizer, scaleRange);
291
292	LiteShape2 shape = getSampleShape(symbolizer, size.width,
293	size.height);
294
295	if (style2d != null) {
296	StyledShapePainter styledShapePainter = new StyledShapePainter(
297	null);
298	styledShapePainter.paint(graphics, shape, style2d,
299	Integer.MAX_VALUE);
300	}
301	}
302	} catch (Exception e) {
303	LOGGER.error(
304	"Error during createImageForRule, returning empty Image", e);
305	}
306	return buffImage;
307	}
308
309	/**
310	* Define Java2D and other Hints
311	*
312	* @param hints
313	* @author <a href="mailto:[email protected]">Stefan Alfons Tzeggai</a>
314	*/
315	public void setHints(Hints hints) {
316	getHints().add(hints);
317	}
318
319	private Hints getHints() {
320	if (hints == null) {
321	hints = GeoTools.getDefaultHints();
322	hints.put(RenderingHints.KEY_ANTIALIASING,
323	RenderingHints.VALUE_ANTIALIAS_ON);
324	hints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
325	RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
326	hints.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
327	RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
328	hints.put(RenderingHints.KEY_RENDERING,
329	RenderingHints.VALUE_RENDER_QUALITY);
330	hints.put(RenderingHints.KEY_COLOR_RENDERING,
331	RenderingHints.VALUE_COLOR_RENDER_QUALITY);
332	}
333	return hints;
334	}
335
336	/**
337	* Creates a little BufferedImage that presents the Style/Symbols used by
338	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
339	*
340	* @param rule
341	* {@link Rule} that provides the text and the style to present
342	* @param featureType
343	* Schema that describes the kind of the sample
344	* {@link SimpleFeature} that will be rendered with the
345	* {@link Style}
346	*
347	* @throws IllegalAttributeException
348	*/
349	public BufferedImage createImageForRule(final Rule rule,
350	final SimpleFeatureType featureType, final Dimension size) {
351	return createImageForRule(rule, featureType, size, null);
352	}
353
354	}