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() {
        }

        final static LegendIconFeatureRenderer instance = new LegendIconFeatureRenderer();

        public static LegendIconFeatureRenderer getInstance() {
                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> 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	alfonx	244	/*******************************************************************************
2			* Copyright (c) 2009 Martin O. J. Schmitz.
3			*
4			* This file is part of the SCHMITZM library - a collection of utility
5	alfonx	256	* classes based on Java 1.6, focusing (not only) on Java Swing
6	alfonx	244	* 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	alfonx	862	* Stefan A. Tzeggai - additional utility classes
29	alfonx	244	******************************************************************************/
30	alfonx	154	/**
31	alfonx	862	Copyright 2008 Stefan Alfons Tzeggai and parts from some Geotools code
32	alfonx	1223
33	alfonx	154	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	alfonx	1270	import org.opengis.feature.IllegalAttributeException;
68	mojays	325	import org.opengis.feature.simple.SimpleFeature;
69			import org.opengis.feature.simple.SimpleFeatureType;
70	alfonx	332	import org.opengis.feature.type.AttributeDescriptor;
71	alfonx	154
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	alfonx	318	* Determining the default values of a {@link SimpleFeatureType} by
86	alfonx	1223	* {@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	alfonx	154	* </ul>
90			*
91	alfonx	862	* @author Stefan Alfons Tzeggai
92	alfonx	154	*/
93	alfonx	1270	public class LegendIconFeatureRenderer {
94	alfonx	1223	// private static final Dimension SIZE = new Dimension(30,20);
95	alfonx	154
96			Logger LOGGER = Logger.getLogger(LegendIconFeatureRenderer.class);
97
98			/**
99			* This is a static class
100			*/
101			private LegendIconFeatureRenderer() {
102			}
103
104			final static LegendIconFeatureRenderer instance = new LegendIconFeatureRenderer();
105
106			public static LegendIconFeatureRenderer getInstance() {
107	alfonx	1270	return instance;
108	alfonx	154	}
109
110			/**
111			* used to create sample point shapes with LiteShape (not lines nor
112			* polygons)
113			*/
114	alfonx	377	private static final GeometryFactory geomFac = FeatureUtil.GEOMETRY_FACTORY;
115	alfonx	154
116			/** padding percentage factor at both sides of the legend. */
117			private static final float hpaddingFactor = 0.11f; // was 0.15
118
119			/** top & bottom padding percentage factor for the legend */
120			private static final float vpaddingFactor = 0.08f; // was 0.15
121
122			/**
123			* Just a holder to avoid creating many polygon shapes from inside
124			* <code>getSampleShape()</code>
125			*/
126			private LiteShape2 sampleRect;
127
128			/**
129			* Just a holder to avoid creating many line shapes from inside
130			* <code>getSampleShape()</code>
131			*/
132			private LiteShape2 sampleLine;
133
134			/**
135			* Just a holder to avoid creating many point shapes from inside
136			* <code>getSampleShape()</code>
137			*/
138			private LiteShape2 samplePoint;
139
140			private Hints hints;
141
142			/**
143	alfonx	1270	* Returns a <code>java.awt.Shape</code> appropriate to render a legend
144	alfonx	154	* graphic given the symbolizer type and the legend dimensions.
145			*
146			* @param symbolizer
147			* the Symbolizer for whose type a sample shape will be created
148			* @param legendWidth
149			* the requested width, in output units, of the legend graphic
150			* @param legendHeight
151			* the requested height, in output units, of the legend graphic
152			*
153			* @return an appropiate Line2D, Rectangle2D or LiteShape(Point) for the
154			* symbolizer, wether it is a LineSymbolizer, a PolygonSymbolizer,
155			* or a Point ot Text Symbolizer
156			*
157			*/
158			private LiteShape2 getSampleShape(Symbolizer symbolizer, int legendWidth,
159			int legendHeight) {
160			LiteShape2 sampleShape;
161			final float hpad = (legendWidth * hpaddingFactor);
162			final float vpad = (legendHeight * vpaddingFactor);
163
164			if (symbolizer instanceof LineSymbolizer) {
165			if (this.sampleLine == null) {
166			Coordinate[] coords = {
167			new Coordinate(hpad, legendHeight - vpad),
168			new Coordinate(legendWidth - hpad, vpad) };
169			LineString geom = geomFac.createLineString(coords);
170
171			try {
172			this.sampleLine = new LiteShape2(geom, null, null, false);
173			} catch (Exception e) {
174			this.sampleLine = null;
175			}
176			}
177
178			sampleShape = this.sampleLine;
179			} else if ((symbolizer instanceof PolygonSymbolizer)
180			\|\| (symbolizer instanceof RasterSymbolizer)) {
181			if (this.sampleRect == null) {
182			final float w = legendWidth - (2 * hpad);
183			final float h = legendHeight - (2 * vpad);
184
185			Coordinate[] coords = { new Coordinate(hpad, vpad),
186			new Coordinate(hpad, vpad + h),
187			new Coordinate(hpad + w, vpad + h),
188			new Coordinate(hpad + w, vpad),
189			new Coordinate(hpad, vpad) };
190			LinearRing shell = geomFac.createLinearRing(coords);
191			Polygon geom = geomFac.createPolygon(shell, null);
192
193			try {
194			this.sampleRect = new LiteShape2(geom, null, null, false);
195			} catch (Exception e) {
196			this.sampleRect = null;
197			}
198			}
199
200			sampleShape = this.sampleRect;
201			} else if (symbolizer instanceof PointSymbolizer
202			\|\| symbolizer instanceof TextSymbolizer) {
203			if (this.samplePoint == null) {
204			Coordinate coord = new Coordinate(legendWidth / 2,
205			legendHeight / 2);
206
207			try {
208	alfonx	1223	this.samplePoint = new LiteShape2(
209			geomFac.createPoint(coord), null, null, false);
210	alfonx	154	} catch (Exception e) {
211			this.samplePoint = null;
212			}
213			}
214
215			sampleShape = this.samplePoint;
216			} else {
217			throw new IllegalArgumentException("Unknown symbolizer: "
218			+ symbolizer);
219			}
220			return sampleShape;
221			}
222	alfonx	1223
223	alfonx	154	/**
224			* Creates a little BufferedImage that presents the Style/Symbols used by
225	alfonx	318	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
226	alfonx	154	*
227			* @param rule
228			* {@link Rule} that provides the text and the style to present
229			* @param featureType
230	alfonx	1223	* Schema that describes the kind of the sample
231			* {@link SimpleFeature} that will be rendered with the
232			* {@link Style}
233	alfonx	154	* @param bg
234			* Background {@link Color} or <code>null</code>
235			*
236			* @throws IllegalAttributeException
237			*/
238	alfonx	1223	public BufferedImage createImageForRule(Rule rule,
239			SimpleFeatureType featureType, Dimension size, Color bg) {
240	alfonx	154
241			Symbolizer[] symbolizers = rule.getSymbolizers();
242
243			BufferedImage buffImage = new BufferedImage(size.width, size.height,
244			BufferedImage.TYPE_INT_ARGB);
245			Graphics2D graphics = buffImage.createGraphics();
246
247			if (bg != null) {
248			// ****************************************************************************
249	alfonx	918	// The following lines define the background color for the rendered
250	alfonx	154	// images
251			// ****************************************************************************
252			graphics.setBackground(bg);
253			graphics.setColor(bg);
254			graphics.fillRect(0, 0, size.width, size.height);
255			}
256
257			// Enable anti-aliasing for the legend symbols
258			graphics.setRenderingHints(getHints());
259
260	alfonx	1223	final NumberRange<Integer> scaleRange = NumberRange.create(
261			Integer.MAX_VALUE, Integer.MAX_VALUE);
262	alfonx	154
263			try {
264
265			for (int sIdx = 0; sIdx < symbolizers.length; sIdx++) {
266			Symbolizer symbolizer = symbolizers[sIdx];
267
268			if (symbolizer instanceof TextSymbolizer) {
269			continue;
270			}
271
272			// if (symbolizer instanceof RasterSymbolizer) {
273			// log.warn("createImageForRule method can't be used for
274			// RasterSymbolizers..");
275			// }
276			// else
277	alfonx	1223	final SimpleFeature sampleFeature = FeatureUtil
278			.createSampleFeature(featureType);
279	alfonx	154
280	alfonx	1223	if (sampleFeature == null)
281			LOGGER.debug("sampleFeature " + sampleFeature);
282
283	alfonx	154	// The SLDStyleFactory has to be recreated, as it seams to cache
284			// some stuff.
285			SLDStyleFactory sldStyleFactory = new SLDStyleFactory();
286			Style2D style2d = sldStyleFactory.createStyle(sampleFeature,
287			symbolizer, scaleRange);
288
289			LiteShape2 shape = getSampleShape(symbolizer, size.width,
290			size.height);
291
292			if (style2d != null) {
293	alfonx	1270	StyledShapePainter styledShapePainter = new StyledShapePainter(
294			null);
295			styledShapePainter.paint(graphics, shape, style2d,
296			Integer.MAX_VALUE);
297	alfonx	154	}
298			}
299			} catch (Exception e) {
300	alfonx	1223	LOGGER.error(
301			"Error during createImageForRule, returning empty Image", e);
302	alfonx	154	}
303			return buffImage;
304			}
305
306			/**
307			* Define Java2D and other Hints
308			*
309			* @param hints
310	alfonx	1273	* @author <a href="mailto:[email protected]">Stefan Alfons Tzeggai</a>
311	alfonx	154	*/
312			public void setHints(Hints hints) {
313			getHints().add(hints);
314			}
315
316			private Hints getHints() {
317			if (hints == null) {
318			hints = GeoTools.getDefaultHints();
319			hints.put(RenderingHints.KEY_ANTIALIASING,
320			RenderingHints.VALUE_ANTIALIAS_ON);
321			hints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
322			RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
323			hints.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
324			RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
325			hints.put(RenderingHints.KEY_RENDERING,
326			RenderingHints.VALUE_RENDER_QUALITY);
327			hints.put(RenderingHints.KEY_COLOR_RENDERING,
328			RenderingHints.VALUE_COLOR_RENDER_QUALITY);
329			}
330			return hints;
331			}
332
333			/**
334			* Creates a little BufferedImage that presents the Style/Symbols used by
335	alfonx	318	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
336	alfonx	154	*
337			* @param rule
338			* {@link Rule} that provides the text and the style to present
339			* @param featureType
340	alfonx	1223	* Schema that describes the kind of the sample
341			* {@link SimpleFeature} that will be rendered with the
342			* {@link Style}
343	alfonx	154	*
344			* @throws IllegalAttributeException
345			*/
346			public BufferedImage createImageForRule(final Rule rule,
347	alfonx	318	final SimpleFeatureType featureType, final Dimension size) {
348	alfonx	154	return createImageForRule(rule, featureType, size, null);
349			}
350
351			}