001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/graphics/displayelements/PointDisplayElement.java $
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005     Department of Geography, University of Bonn
006     and
007     lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035     ----------------------------------------------------------------------------*/
036    package org.deegree.graphics.displayelements;
037    
038    import java.awt.Color;
039    import java.awt.Graphics;
040    import java.awt.Graphics2D;
041    import java.awt.Image;
042    import java.awt.image.BufferedImage;
043    
044    import org.deegree.framework.log.ILogger;
045    import org.deegree.framework.log.LoggerFactory;
046    import org.deegree.graphics.sld.PointSymbolizer;
047    import org.deegree.graphics.sld.Symbolizer;
048    import org.deegree.graphics.transformation.GeoTransform;
049    import org.deegree.model.feature.Feature;
050    import org.deegree.model.filterencoding.FilterEvaluationException;
051    import org.deegree.model.spatialschema.Envelope;
052    import org.deegree.model.spatialschema.MultiPoint;
053    import org.deegree.model.spatialschema.Point;
054    import org.deegree.model.spatialschema.Position;
055    
056    /**
057     * DisplayElement that encapsulates a point geometry (<tt>GM_Point</tt>) and a <tt>PointSymbolizer</tt>.
058     * <p>
059     * 
060     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
061     * @author <a href="mailto:mschneider@lat-lon.de">Markus Schneider</a>
062     * @version $Revision: 20198 $ $Date: 2009-10-20 09:18:00 +0200 (Di, 20 Okt 2009) $
063     */
064    class PointDisplayElement extends GeometryDisplayElement {
065    
066        private static ILogger LOG = LoggerFactory.getLogger( PointDisplayElement.class );
067    
068        /** Use serialVersionUID for interoperability. */
069        private final static long serialVersionUID = -2979559276151855757L;
070    
071        private transient static Image defaultImg = new BufferedImage( 7, 7, BufferedImage.TYPE_INT_ARGB );
072    
073        static {
074            Graphics g = defaultImg.getGraphics();
075            g.setColor( Color.LIGHT_GRAY );
076            g.fillRect( 0, 0, 9, 9 );
077            g.dispose();
078        }
079    
080        /**
081         * Creates a new PointDisplayElement_Impl object.
082         * 
083         * @param feature
084         * @param geometry
085         */
086        public PointDisplayElement( Feature feature, Point geometry ) {
087            super( feature, geometry, null );
088    
089            Symbolizer defaultSymbolizer = new PointSymbolizer();
090            this.setSymbolizer( defaultSymbolizer );
091        }
092    
093        /**
094         * Creates a new PointDisplayElement_Impl object.
095         * 
096         * @param feature
097         * @param geometry
098         * @param symbolizer
099         */
100        public PointDisplayElement( Feature feature, Point geometry, PointSymbolizer symbolizer ) {
101            super( feature, geometry, symbolizer );
102        }
103    
104        /**
105         * Creates a new PointDisplayElement object.
106         * 
107         * @param feature
108         * @param geometry
109         */
110        public PointDisplayElement( Feature feature, MultiPoint geometry ) {
111            super( feature, geometry, null );
112    
113            Symbolizer defaultSymbolizer = new PointSymbolizer();
114            this.setSymbolizer( defaultSymbolizer );
115        }
116    
117        /**
118         * Creates a new PointDisplayElement object.
119         * 
120         * @param feature
121         * @param geometry
122         * @param symbolizer
123         */
124        public PointDisplayElement( Feature feature, MultiPoint geometry, PointSymbolizer symbolizer ) {
125            super( feature, geometry, symbolizer );
126        }
127    
128        /**
129         * renders the DisplayElement to the submitted graphic context
130         */
131        public void paint( Graphics g, GeoTransform projection, double scale ) {
132            synchronized ( symbolizer ) {
133                ( (ScaledFeature) feature ).setScale( scale );
134                try {
135                    Image image = defaultImg;
136    
137                    if ( ( (PointSymbolizer) symbolizer ).getGraphic() != null ) {
138                        image = ( (PointSymbolizer) symbolizer ).getGraphic().getAsImage( feature );
139                    }
140                    Graphics2D g2D = (Graphics2D) g;
141    
142                    if ( geometry instanceof Point ) {
143                        drawPoint( g2D, (Point) geometry, projection, image );
144                    } else {
145                        MultiPoint mp = (MultiPoint) geometry;
146    
147                        for ( int i = 0; i < mp.getSize(); i++ ) {
148                            drawPoint( g2D, mp.getPointAt( i ), projection, image );
149                        }
150                    }
151                } catch ( FilterEvaluationException e ) {
152                    LOG.logError( "Exception caught evaluating an Expression!", e );
153                }
154            }
155        }
156    
157        /**
158         * renders one point to the submitted graphic context considering the also submitted projection
159         */
160        private void drawPoint( Graphics2D g, Point point, GeoTransform projection, Image image ) {
161            Envelope destSize = projection.getDestRect();
162            Position source = point.getPosition();
163            int x = (int) ( projection.getDestX( source.getX() ) + 0.5 );
164            int y = (int) ( projection.getDestY( source.getY() ) + 0.5 );
165    
166            int x_ = x - ( image.getWidth( null ) >> 1 );
167            int y_ = y - ( image.getHeight( null ) >> 1 );
168    
169            int dx = Math.min( image.getWidth( null ), (int) destSize.getWidth() - x_ );
170            int dy = Math.min( image.getHeight( null ), (int) destSize.getHeight() - y_ );
171            int tx = Math.min( (int) destSize.getWidth(), x_ + image.getWidth( null ) );
172            int ty = Math.min( (int) destSize.getHeight(), y_ + image.getHeight( null ) );
173    
174            g.drawImage( image, x_, y_, tx, ty, 0, 0, dx, dy, null );
175        }
176    }