    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/ogcwebservices/wms/capabilities/ScaleHint.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.wms.capabilities;
    037
    038
    039
    040    /**
    041     * Layers may include a <ScaleHint> element that suggests minimum and maximum
    042     * scales for which it is appropriate to display this layer. Because WMS output
    043     * is destined for output devices of arbitrary size and resolution, the usual
    044     * definition of scale as the ratio of map size to real-world size is not
    045     * appropriate here. The following definition of Scale Hint is recommended.
    046     * Consider a hypothetical map with a given Bounding Box, width and height.
    047     * The central pixel of that map (or the pixel just to the northwest of center)
    048     * will have some size, which can be expressed as the ground distance in meters
    049     * of the southwest to northeast diagonal of that pixel. The two values in
    050     * ScaleHint are the minimum and maximum recommended values of that diagonal. It
    051     * is recognized that this definition is not geodetically precise, but at the
    052     * same time the hope is that by including it conventions will develop that can
    053     * be later specified more clearly.
    054     * <p>----------------------------------------------------------------------</p>
    055     *
    056     * @author <a href="mailto:k.lupp@web.de">Andreas Poth</a>
    057     * @author <a href="mailto:mschneider@lat-lon.de">Markus Schneider</a>
    058     * @version $Revision: 18195 $
    059     */
    060    public class ScaleHint {
    061        private double max = Double.MAX_VALUE;
    062        private double min = 0;
    063
    064        /**
    065        * constructor initializing the class with the <ScaleHint>
    066         * @param min
    067         * @param max
    068        */
    069        public ScaleHint( double min, double max ) {
    070            setMin( min );
    071            setMax( max );
    072        }
    073
    074        /**
    075         * @return the minimum scale for which a layer is defined
    076         */
    077        public double getMin() {
    078            return min;
    079        }
    080
    081        /**
    082        * sets the minimum scale for which a layer is defined
    083        * @param min
    084        */
    085        public void setMin( double min ) {
    086            this.min = min;
    087        }
    088
    089        /**
    090         * @return the maximum scale for which a layer is defined
    091         */
    092        public double getMax() {
    093            return max;
    094        }
    095
    096        /**
    097        * sets the maximum scale for which a layer is defined
    098        * @param max
    099        */
    100        public void setMax( double max ) {
    101            this.max = max;
    102        }
    103
    104        @Override
    105        public String toString() {
    106            String ret = null;
    107            ret = "min = " + min + "\n";
    108            ret += ( "max = " + max + "\n" );
    109            return ret;
    110        }
    111
    112    }