001 //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/ogcwebservices/wpvs/utils/SunLight.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.ogcwebservices.wpvs.utils;
037
038 import javax.vecmath.Color3f;
039
040 /**
041 * class for calculating sun light according to a specific tima, day of
042 * the year (northern hemisper)
043 *
044 *
045 * @version $Revision: 18195 $
046 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
047 * @author last edited by: $Author: mschneider $
048 *
049 * $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
050 *
051 */
052 public class SunLight {
053
054 private static final float BASE_LIGHT_INTENSITY = 0.95f;
055 private SunPosition sunPosition;
056 private double latitude;
057
058 /**
059 * @param latitude the position on the earth
060 * @param sunPosition the Position of the sun
061 */
062 public SunLight( double latitude, SunPosition sunPosition ){
063 this.latitude = latitude;
064 this.sunPosition = sunPosition;
065 }
066
067
068 /**
069 * @return a Color of the sunlight
070 */
071 public Color3f calculateSunlight( ) {
072
073 double vDir = sunPosition.getVerticalSunposition( latitude );
074 float c = 7.25f*((float)Math.sin( vDir ));
075
076 float r = (float)(BASE_LIGHT_INTENSITY + (c/16.0) + 0.05)*0.6f;
077 float g = (float)(BASE_LIGHT_INTENSITY + (c/18.5) + 0.05)*0.6f;
078 float b = (float)(BASE_LIGHT_INTENSITY +(c/17.0) + 0.05)*0.55f;
079 if ( r > 1 ) r = 1;
080 if ( g > 1 ) g = 1;
081 if ( b > 1 ) b = 1;
082
083 return new Color3f( r, g, b );
084 }
085
086 /**
087 * @param cloudFactor describing howmuch clouds cover the sun
088 * @return the intensity of the
089 */
090 public float calcSunlightIntensity( float cloudFactor) {
091 if( cloudFactor < 0 || cloudFactor > 1.0 )
092 cloudFactor = 1;
093 Color3f vec = calculateSunlight( );
094 return ((vec.x + vec.y + vec.z)* 0.33333f )* cloudFactor;
095 }
096
097 }