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	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	154
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	mojays	325	import org.opengis.feature.simple.SimpleFeature;
71			import org.opengis.feature.simple.SimpleFeatureType;
72	alfonx	332	import org.opengis.feature.type.AttributeDescriptor;
73	alfonx	154
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	alfonx	318	* Determining the default values of a {@link SimpleFeatureType} by
90			* {@link FeatureUtil#getDefaultAttributeValues(SimpleFeatureType)} instead of using
91	alfonx	332	* {@link AttributeDescriptor#createDefaultValue()} directly, because the latter
92	alfonx	154	* returns {@code null} even though the attribut is not nillable.</li>
93			* </ul>
94			*
95	alfonx	862	* @author Stefan Alfons Tzeggai
96	alfonx	154	*/
97			public class LegendIconFeatureRenderer extends DefaultTreeCellRenderer {
98	alfonx	377	// private static final Dimension SIZE = new Dimension(30,20);
99	alfonx	154
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	alfonx	377
113			// TODO TEST, whether we still need to recreate the renderer here....
114	alfonx	452	// 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	alfonx	154	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	alfonx	377	private static final GeometryFactory geomFac = FeatureUtil.GEOMETRY_FACTORY;
130	alfonx	154
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	alfonx	516
240	alfonx	154	/**
241			* Creates a little BufferedImage that presents the Style/Symbols used by
242	alfonx	318	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
243	alfonx	154	*
244			* @param rule
245			* {@link Rule} that provides the text and the style to present
246			* @param featureType
247	alfonx	318	* Schema that describes the kind of the sample {@link SimpleFeature}
248	alfonx	154	* 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	alfonx	318	public BufferedImage createImageForRule(Rule rule, SimpleFeatureType featureType,
255	alfonx	154	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	alfonx	918	// The following lines define the background color for the rendered
266	alfonx	154	// 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	alfonx	452	final NumberRange<Integer> scaleRange = NumberRange.create(Integer.MAX_VALUE,Integer.MAX_VALUE);
277	alfonx	154
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	alfonx	318	final SimpleFeature sampleFeature = FeatureUtil.createSampleFeature(featureType);
293	alfonx	154
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	alfonx	452	style2d, Integer.MAX_VALUE );
306	alfonx	154	}
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	alfonx	888	* Tzeggai</a>
323	alfonx	154	*/
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	alfonx	318	* the {@link MapLegend} to show a legend for the {@link SimpleFeatureType}
348	alfonx	154	*
349			* @param rule
350			* {@link Rule} that provides the text and the style to present
351			* @param featureType
352	alfonx	318	* Schema that describes the kind of the sample {@link SimpleFeature}
353	alfonx	154	* that will be rendered with the {@link Style}
354			*
355			* @throws IllegalAttributeException
356			*/
357			public BufferedImage createImageForRule(final Rule rule,
358	alfonx	318	final SimpleFeatureType featureType, final Dimension size) {
359	alfonx	154	return createImageForRule(rule, featureType, size, null);
360			}
361
362			}