    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/portal/standard/wms/control/RecenterToLayerListener.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
    037    package org.deegree.portal.standard.wms.control;
    038
    039    import java.net.URL;
    040
    041    import javax.servlet.ServletRequest;
    042
    043    import org.deegree.enterprise.control.AbstractListener;
    044    import org.deegree.enterprise.control.FormEvent;
    045    import org.deegree.enterprise.control.RPCMethodCall;
    046    import org.deegree.enterprise.control.RPCParameter;
    047    import org.deegree.enterprise.control.RPCStruct;
    048    import org.deegree.enterprise.control.RPCWebEvent;
    049    import org.deegree.framework.util.MapUtils;
    050    import org.deegree.model.crs.CRSFactory;
    051    import org.deegree.model.crs.GeoTransformer;
    052    import org.deegree.model.spatialschema.Envelope;
    053    import org.deegree.ogcwebservices.wms.capabilities.ScaleHint;
    054    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilities;
    055    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilitiesDocument;
    056    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilitiesDocumentFactory;
    057    import org.deegree.portal.PortalException;
    058
    059    /**
    060     * This class sets the bounding box of the portal to the bounding box of one selected layer as it is specified in the
    061     * WMSCapabilities document of that layer.
    062     *
    063     * If the ScaleHint of the layer reduces the visible part of the layer's LatLonBoundingBox, then a new bounding box for
    064     * this scale hint is calculated. Ohterwise the LatLonBoundingBox is used.
    065     *
    066     * The chosen bounding box is transformed to the portals crs and the portals aspect ratio of width and height.
    067     *
    068     * @author <a href="mailto:ncho@lat-lon.de">Serge N'Cho</a>
    069     * @author <a href="mailto:mays@lat-lon.de">Judit Mays</a>
    070     * @author last edited by: $Author: mschneider $
    071     *
    072     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    073     */
    074    public class RecenterToLayerListener extends AbstractListener {
    075
    076        private static final double PIXEL_SIZE_IN_METERS = 0.00028;
    077
    078        /*
    079         * (non-Javadoc)
    080         *
    081         * @see org.deegree.enterprise.control.WebListener#actionPerformed(org.deegree.enterprise.control.FormEvent)
    082         */
    083        @Override
    084        public void actionPerformed( FormEvent event ) {
    085
    086            RPCWebEvent rpc = (RPCWebEvent) event;
    087            RPCMethodCall mc = rpc.getRPCMethodCall();
    088            RPCParameter param = mc.getParameters()[0];
    089            RPCStruct struct = (RPCStruct) param.getValue();
    090
    091            String capabilitiesRequest = struct.getMember( "capabilitiesRequest" ).getValue().toString();
    092            String layerName = struct.getMember( "layerName" ).getValue().toString();
    093
    094            String crs = struct.getMember( "crs" ).getValue().toString();
    095
    096            int mapWidth = Integer.parseInt( struct.getMember( "mapWidth" ).getValue().toString() );
    097            int mapHeight = Integer.parseInt( struct.getMember( "mapHeight" ).getValue().toString() );
    098
    099            try {
    100                URL url = new URL( capabilitiesRequest );
    101                WMSCapabilitiesDocument capsDoc = WMSCapabilitiesDocumentFactory.getWMSCapabilitiesDocument( url );
    102
    103                WMSCapabilities wmsCaps = (WMSCapabilities) capsDoc.parseCapabilities();
    104                // Envelope in epsg4326
    105                Envelope latLonBBox = wmsCaps.getLayer( layerName ).getLatLonBoundingBox();
    106
    107                if ( latLonBBox == null ) {
    108                    // this will never happen, because:
    109                    // capsDoc.parseCapabilities will check, that there is a latLonBBox for the
    110                    // document.
    111                    // otherwise an exception will be thrown there.
    112                    // getLayer( someName ).getLatLonBoundingBox() returns the bbox for the given layer,
    113                    // or, if not set, returns the bbox of the parentLayer.
    114                    throw new PortalException( "LatLonBoundingBox not found in Capabilities" );
    115                }
    116
    117                Envelope outBBox = null;
    118                final String epsg4326 = "EPSG:4326";
    119                ScaleHint scaleHint = wmsCaps.getLayer( layerName ).getScaleHint();
    120
    121                // should use Double.POSITIVE_INFINITY instead of Double.MAX_VALUE
    122                if ( scaleHint.getMax() == Double.MAX_VALUE && scaleHint.getMin() == 0 ) {
    123                    // scaleHint is not defined in capabilities
    124
    125                    double latLonScale = MapUtils.calcScale( mapWidth, mapHeight, latLonBBox,
    126                                                             CRSFactory.create( epsg4326 ), PIXEL_SIZE_IN_METERS );
    127                    Envelope scaleHintBBox = MapUtils.scaleEnvelope( latLonBBox, latLonScale, scaleHint.getMax() );
    128
    129                    // both bboxes are in crs EPSG:4326
    130                    if ( scaleHintBBox.getWidth() < latLonBBox.getWidth()
    131                         && scaleHintBBox.getHeight() < latLonBBox.getHeight() ) {
    132
    133                        outBBox = scaleHintBBox;
    134                    } else {
    135                        outBBox = latLonBBox;
    136                    }
    137                } else {
    138                    outBBox = latLonBBox;
    139                }
    140
    141                // transform outBBox to the crs of the portal
    142                outBBox = new GeoTransformer( crs ).transform( outBBox, epsg4326 );
    143
    144                // ensure aspect ratio of the portal
    145                outBBox = MapUtils.ensureAspectRatio( outBBox, mapWidth, mapHeight );
    146
    147                double layerBBoxArray[] = { outBBox.getMin().getX(), outBBox.getMin().getY(), outBBox.getMax().getX(),
    148                                           outBBox.getMax().getY() };
    149
    150                ServletRequest req = this.getRequest();
    151                req.setAttribute( "BBOX", layerBBoxArray );
    152
    153            } catch ( Exception e ) {
    154                e.printStackTrace();
    155            }
    156        }
    157
    158    }