    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/graphics/displayelements/LineStringDisplayElement.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.BasicStroke;
    039    import java.awt.Color;
    040    import java.awt.Graphics;
    041    import java.awt.Graphics2D;
    042    import java.awt.Image;
    043    import java.awt.geom.AffineTransform;
    044    import java.io.Serializable;
    045    import java.util.ArrayList;
    046    import java.util.Iterator;
    047
    048    import org.deegree.framework.log.ILogger;
    049    import org.deegree.framework.log.LoggerFactory;
    050    import org.deegree.graphics.sld.LineSymbolizer;
    051    import org.deegree.graphics.sld.Symbolizer;
    052    import org.deegree.graphics.transformation.GeoTransform;
    053    import org.deegree.model.feature.Feature;
    054    import org.deegree.model.filterencoding.FilterEvaluationException;
    055    import org.deegree.model.spatialschema.Curve;
    056    import org.deegree.model.spatialschema.Envelope;
    057    import org.deegree.model.spatialschema.Geometry;
    058    import org.deegree.model.spatialschema.GeometryFactory;
    059    import org.deegree.model.spatialschema.LineString;
    060    import org.deegree.model.spatialschema.MultiCurve;
    061    import org.deegree.model.spatialschema.Position;
    062    import org.deegree.model.spatialschema.Surface;
    063
    064    /**
    065     * {@link DisplayElement} that encapsulates a linestring or multi-linestring geometry and a
    066     * {@link LineSymbolizer}.
    067     * <p>
    068     * It can be rendered using a solid stroke or a graphics stroke.
    069     *
    070     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
    071     * @author <a href="mailto:mschneider@lat-lon.de">Markus Schneider</a>
    072     * @author last edited by: $Author: mschneider $
    073     *
    074     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    075     */
    076    class LineStringDisplayElement extends GeometryDisplayElement implements DisplayElement, Serializable {
    077
    078        private static final ILogger LOG = LoggerFactory.getLogger( LineStringDisplayElement.class );
    079
    080        /** Use serialVersionUID for interoperability. */
    081        private final static long serialVersionUID = -4657962592230618248L;
    082
    083        /**
    084         * Creates a new {@link LineStringDisplayElement} object.
    085         *
    086         * @param feature
    087         * @param geometry
    088         */
    089        public LineStringDisplayElement( Feature feature, Curve geometry ) {
    090            super( feature, geometry, null );
    091
    092            Symbolizer defaultSymbolizer = new LineSymbolizer();
    093            this.setSymbolizer( defaultSymbolizer );
    094        }
    095
    096        /**
    097         * Creates a new {@link LineStringDisplayElement} object.
    098         *
    099         * @param feature
    100         * @param geometry
    101         * @param symbolizer
    102         */
    103        public LineStringDisplayElement( Feature feature, Curve geometry, LineSymbolizer symbolizer ) {
    104            super( feature, geometry, symbolizer );
    105        }
    106
    107        /**
    108         * Creates a new {@link LineStringDisplayElement} object.
    109         *
    110         * @param feature
    111         * @param geometry
    112         */
    113        public LineStringDisplayElement( Feature feature, MultiCurve geometry ) {
    114            super( feature, geometry, null );
    115
    116            Symbolizer defaultSymbolizer = new LineSymbolizer();
    117            this.setSymbolizer( defaultSymbolizer );
    118        }
    119
    120        /**
    121         * Creates a new {@link LineStringDisplayElement} object.
    122         *
    123         * @param feature
    124         * @param geometry
    125         * @param symbolizer
    126         */
    127        public LineStringDisplayElement( Feature feature, MultiCurve geometry, LineSymbolizer symbolizer ) {
    128            super( feature, geometry, symbolizer );
    129        }
    130
    131        /**
    132         * Draws a graphics symbol (image) onto a defined position on the line.
    133         *
    134         * @param image
    135         * @param g
    136         * @param x
    137         * @param y
    138         * @param rotation
    139         */
    140        private void paintImage( Image image, Graphics2D g, int x, int y, double rotation ) {
    141
    142            // get the current transform
    143            AffineTransform saveAT = g.getTransform();
    144
    145            // translation parameters (rotation)
    146            AffineTransform transform = new AffineTransform();
    147            transform.rotate( rotation, x, y );
    148            transform.translate( -image.getWidth( null ), -image.getHeight( null ) / 2.0 );
    149            g.setTransform( transform );
    150
    151            // render the image
    152            g.drawImage( image, x, y, null );
    153
    154            // restore original transform
    155            g.setTransform( saveAT );
    156        }
    157
    158        /**
    159         * Renders the DisplayElement to the submitted graphic context.
    160         *
    161         * @param g
    162         * @param projection
    163         * @param scale
    164         */
    165        public void paint( Graphics g, GeoTransform projection, double scale ) {
    166            synchronized ( symbolizer ) {
    167                if ( geometry == null ) {
    168                    return;
    169                }
    170
    171                // a local instance must be used because the following intersection operation may change
    172                // the
    173                // geometry type
    174                Geometry geom = geometry;
    175                try {
    176                    Envelope screenRect = projection.getSourceRect();
    177                    // grow by 5 percent to cope with partly overlapping stroke graphics
    178                    screenRect = growEnvelope( screenRect, 0.05f );
    179                    Surface sur = GeometryFactory.createSurface( screenRect, null );
    180                    geom = sur.intersection( geometry );
    181                } catch ( Exception e ) {
    182                    // use original geometry
    183                }
    184                if ( geom == null ) {
    185                    return;
    186                }
    187
    188                LOG.logDebug( "After clipping: " + geom.getClass().getName() );
    189
    190                ( (ScaledFeature) feature ).setScale( scale );
    191
    192                LineSymbolizer sym = (LineSymbolizer) symbolizer;
    193                org.deegree.graphics.sld.Stroke stroke = sym.getStroke();
    194
    195                // no stroke defined -> don't draw anything
    196                if ( stroke == null ) {
    197                    return;
    198                }
    199
    200                try {
    201                    if ( stroke.getOpacity( feature ) > 0.001 ) {
    202                        // do not paint if feature is completly transparent
    203                        int[][] pos = null;
    204                        Graphics2D g2 = (Graphics2D) g;
    205
    206                        if ( geom instanceof Curve ) {
    207                            pos = calcTargetCoordinates( projection, (Curve) geom );
    208                            drawLine( g2, pos, stroke );
    209                        } else {
    210                            MultiCurve mc = (MultiCurve) geom;
    211                            for ( int i = 0; i < mc.getSize(); i++ ) {
    212                                pos = calcTargetCoordinates( projection, mc.getCurveAt( i ) );
    213                                drawLine( g2, pos, stroke );
    214                            }
    215                        }
    216                    }
    217                } catch ( Exception e ) {
    218                    LOG.logError( e.getMessage(), e );
    219                }
    220
    221                // GraphicStroke label
    222                if ( stroke.getGraphicStroke() != null ) {
    223                    try {
    224                        Image image = stroke.getGraphicStroke().getGraphic().getAsImage( feature );
    225                        CurveWalker walker = new CurveWalker( g.getClipBounds() );
    226
    227                        if ( geom instanceof Curve ) {
    228                            int[][] pos = LabelFactory.calcScreenCoordinates( projection, (Curve) geom );
    229                            ArrayList<double[]> positions = walker.createPositions( pos, image.getWidth( null ), false );
    230                            Iterator<double[]> it = positions.iterator();
    231                            while ( it.hasNext() ) {
    232                                double[] label = it.next();
    233                                int x = (int) ( label[0] + 0.5 );
    234                                int y = (int) ( label[1] + 0.5 );
    235                                paintImage( image, (Graphics2D) g, x, y, Math.toRadians( label[2] ) );
    236                            }
    237                        } else {
    238                            MultiCurve mc = (MultiCurve) geom;
    239                            for ( int i = 0; i < mc.getSize(); i++ ) {
    240                                int[][] pos = LabelFactory.calcScreenCoordinates( projection, mc.getCurveAt( i ) );
    241                                ArrayList<double[]> positions = walker.createPositions( pos, image.getWidth( null ), false );
    242                                Iterator<double[]> it = positions.iterator();
    243                                while ( it.hasNext() ) {
    244                                    double[] label = it.next();
    245                                    int x = (int) ( label[0] + 0.5 );
    246                                    int y = (int) ( label[1] + 0.5 );
    247                                    paintImage( image, (Graphics2D) g, x, y, Math.toRadians( label[2] ) );
    248                                }
    249                            }
    250                        }
    251                    } catch ( Exception e ) {
    252                        LOG.logError( e.getMessage(), e );
    253                    }
    254                }
    255            }
    256        }
    257
    258        /**
    259         * Calculates the screen coordinates of the curve.
    260         */
    261        private int[][] calcTargetCoordinates( GeoTransform projection, Curve curve )
    262                                throws Exception {
    263            LineString lineString = curve.getAsLineString();
    264            int count = lineString.getNumberOfPoints();
    265            int[][] pos = new int[3][];
    266            pos[0] = new int[count];
    267            pos[1] = new int[count];
    268            pos[2] = new int[1];
    269
    270            int k = 0;
    271            for ( int i = 0; i < count; i++ ) {
    272                Position position = lineString.getPositionAt( i );
    273                double tx = projection.getDestX( position.getX() );
    274                double ty = projection.getDestY( position.getY() );
    275
    276                if ( i > 0 ) {
    277                    if ( distance( tx, ty, pos[0][k - 1], pos[1][k - 1] ) > 1 ) {
    278                        pos[0][k] = (int) ( tx + 0.5 );
    279                        pos[1][k] = (int) ( ty + 0.5 );
    280                        k++;
    281                    }
    282                } else {
    283                    pos[0][k] = (int) ( tx + 0.5 );
    284                    pos[1][k] = (int) ( ty + 0.5 );
    285                    k++;
    286                }
    287            }
    288            pos[2][0] = k;
    289
    290            return pos;
    291        }
    292
    293        /**
    294         * Renders a curve to the submitted graphic context.
    295         *
    296         * TODO: Calculate miterlimit.
    297         */
    298        private void drawLine( Graphics g, int[][] pos, org.deegree.graphics.sld.Stroke stroke )
    299                                throws FilterEvaluationException {
    300
    301            // Color & Opacity
    302            Graphics2D g2 = (Graphics2D) g;
    303            setColor( g2, stroke.getStroke( feature ), stroke.getOpacity( feature ) );
    304
    305            float[] dash = stroke.getDashArray( feature );
    306
    307            // use a simple Stroke if dash == null or its length < 2
    308            // that's faster
    309            float width = (float) stroke.getWidth( feature );
    310            int cap = stroke.getLineCap( feature );
    311            int join = stroke.getLineJoin( feature );
    312            BasicStroke bs2 = null;
    313
    314            if ( ( dash == null ) || ( dash.length < 2 ) ) {
    315                bs2 = new BasicStroke( width, cap, join );
    316            } else {
    317                bs2 = new BasicStroke( width, cap, join, 10.0f, dash, stroke.getDashOffset( feature ) );
    318            }
    319
    320            g2.setStroke( bs2 );
    321
    322            g2.drawPolyline( pos[0], pos[1], pos[2][0] );
    323
    324        }
    325
    326        private double distance( double x1, double y1, double x2, double y2 ) {
    327            return Math.sqrt( ( x2 - x1 ) * ( x2 - x1 ) + ( y2 - y1 ) * ( y2 - y1 ) );
    328        }
    329
    330        private Graphics2D setColor( Graphics2D g2, Color color, double opacity ) {
    331            if ( opacity < 0.999 ) {
    332                // just use a color having an alpha channel if a significant
    333                // level of transparency has been defined
    334                final int alpha = (int) Math.round( opacity * 255 );
    335                final int red = color.getRed();
    336                final int green = color.getGreen();
    337                final int blue = color.getBlue();
    338                color = new Color( red, green, blue, alpha );
    339            }
    340
    341            g2.setColor( color );
    342            return g2;
    343        }
    344    }