//$Header: /home/deegree/jail/deegreerepository/deegree/src/org/deegree/portal/standard/wms/control/RecenterToLayerListener.java,v 1.1 2006/11/28 13:47:27 mays Exp $
/*---------------- FILE HEADER ------------------------------------------
This file is part of deegree.
Copyright (C) 2001-2006 by:
Department of Geography, University of Bonn
http://www.giub.uni-bonn.de/deegree/
lat/lon GmbH
http://www.lat-lon.de
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Andreas Poth
lat/lon GmbH
Aennchenstr. 19
53177 Bonn
Germany
E-Mail: poth@lat-lon.de
Prof. Dr. Klaus Greve
Department of Geography
University of Bonn
Meckenheimer Allee 166
53115 Bonn
Germany
E-Mail: greve@giub.uni-bonn.de
---------------------------------------------------------------------------*/
package org.deegree.portal.standard.wms.control;
import java.net.URL;
import javax.servlet.ServletRequest;
import org.deegree.enterprise.control.AbstractListener;
import org.deegree.enterprise.control.FormEvent;
import org.deegree.enterprise.control.RPCMethodCall;
import org.deegree.enterprise.control.RPCParameter;
import org.deegree.enterprise.control.RPCStruct;
import org.deegree.enterprise.control.RPCWebEvent;
import org.deegree.framework.util.MapUtils;
import org.deegree.model.crs.CRSFactory;
import org.deegree.model.crs.GeoTransformer;
import org.deegree.model.spatialschema.Envelope;
import org.deegree.ogcwebservices.wms.capabilities.ScaleHint;
import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilities;
import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilitiesDocument;
import org.deegree.portal.PortalException;
/**
* This class sets the bounding box of the portal to the bounding box of one selected layer as it
* is specified in the WMSCapabilities document of that layer.
*
* If the ScaleHint of the layer reduces the visible part of the layer's LatLonBoundingBox,
* then a new bounding box for this scale hint is calculated.
* Ohterwise the LatLonBoundingBox is used.
*
* The chosen bounding box is transformed to the portals crs
* and the portals aspect ratio of width and height.
*
* @author <a href="mailto:ncho@lat-lon.de">Serge N'Cho</a>
* @author <a href="mailto:mays@lat-lon.de">Judit Mays</a>
* @author last edited by: $Author: mays $
*
* @version $Revision: 1.1 $, $Date: 2006/11/28 13:47:27 $
*/
public class RecenterToLayerListener extends AbstractListener {
private static final double PIXEL_SIZE_IN_METERS = 0.00028;
/* (non-Javadoc)
* @see org.deegree.enterprise.control.WebListener#actionPerformed(org.deegree.enterprise.control.FormEvent)
*/
public void actionPerformed( FormEvent event ) {
RPCWebEvent rpc = (RPCWebEvent) event;
RPCMethodCall mc = rpc.getRPCMethodCall();
RPCParameter param = mc.getParameters()[0];
RPCStruct struct = (RPCStruct) param.getValue();
String capabilitiesRequest = struct.getMember( "capabilitiesRequest" ).getValue().toString();
String layerName = struct.getMember( "layerName" ).getValue().toString();
String crs = struct.getMember( "crs" ).getValue().toString();
int mapWidth = Integer.parseInt( struct.getMember( "mapWidth" ).getValue().toString() );
int mapHeight = Integer.parseInt( struct.getMember( "mapHeight" ).getValue().toString() );
try {
WMSCapabilitiesDocument capsDoc = new WMSCapabilitiesDocument();
capsDoc.load( new URL( capabilitiesRequest ) );
WMSCapabilities wmsCaps = (WMSCapabilities) capsDoc.parseCapabilities();
//Envelope in epsg4326
Envelope latLonBBox = wmsCaps.getLayer( layerName ).getLatLonBoundingBox();
if ( latLonBBox == null ) {
// this will never happen, because:
// capsDoc.parseCapabilities will check, that there is a latLonBBox for the document.
// otherwise an exception will be thrown there.
// getLayer( someName ).getLatLonBoundingBox() returns the bbox for the given layer,
// or, if not set, returns the bbox of the parentLayer.
throw new PortalException( "LatLonBoundingBox not found in Capabilities" );
}
Envelope outBBox = null;
final String epsg4326 = "EPSG:4326";
ScaleHint scaleHint = wmsCaps.getLayer( layerName ).getScaleHint();
//should use Double.POSITIVE_INFINITY instead of Double.MAX_VALUE
if ( scaleHint.getMax() == Double.MAX_VALUE && scaleHint.getMin() == 0 ){
// scaleHint is not defined in capabilities
double latLonScale = MapUtils.calcScale( mapWidth, mapHeight, latLonBBox,
CRSFactory.create( epsg4326 ),
PIXEL_SIZE_IN_METERS );
Envelope scaleHintBBox = MapUtils.scaleEnvelope( latLonBBox, latLonScale,
scaleHint.getMax() );
//both bboxes are in crs EPSG:4326
if ( scaleHintBBox.getWidth() < latLonBBox.getWidth() &&
scaleHintBBox.getHeight() < latLonBBox.getHeight() ) {
outBBox = scaleHintBBox;
} else {
outBBox = latLonBBox;
}
} else {
outBBox = latLonBBox;
}
// transform outBBox to the crs of the portal
outBBox = new GeoTransformer( crs ).transform( outBBox, epsg4326 );
// ensure aspect ratio of the portal
outBBox = MapUtils.ensureAspectRatio( outBBox, mapWidth, mapHeight );
double layerBBoxArray[] = { outBBox.getMin().getX(), outBBox.getMin().getY(),
outBBox.getMax().getX(), outBBox.getMax().getY() };
ServletRequest req = this.getRequest();
req.setAttribute( "BBOX", layerBBoxArray );
} catch ( Exception e ) {
e.printStackTrace();
}
}
}
/* ********************************************************************
Changes to this class. What the people have been up to:
$Log: RecenterToLayerListener.java,v $
Revision 1.1 2006/11/28 13:47:27 mays
add RecenterToLayerListener to deegree2 iGeoPortal Std.Ed.
********************************************************************** */