Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.fmap.mapcontrol.tools;

import java.awt.Image;

import java.awt.geom.Point2D;

import javax.swing.ImageIcon;

import org.gvsig.fmap.IconThemeHelper;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.exception.CreateEnvelopeException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontrol.MapControl;

import org.gvsig.fmap.mapcontrol.tools.Events.PointEvent;

import org.gvsig.fmap.mapcontrol.tools.Listeners.PointListener;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * <p>Listener for doing a <i>zoom out</i> operation on the extent of the <code>ViewPort</code> of the associated {@link MapControl MapControl}

 *  object, selecting a point of the <code>MapControl</code> by a single click of any mouse's button.</p>

 *

 * <p>Calculates the new extent <i>r</i> with this equations:

 *  <code><br>

 *   ViewPort vp = mapControl.getMapContext().getViewPort();<br>

 *   Point2D p2 = vp.toMapPoint(event.getPoint());<br>

 *   double factor = 1/MapContext.ZOOMOUTFACTOR;<br>

 *   Rectangle2D.Double r = new Rectangle2D.Double();<br>

 *   double nuevoX = p2.getX() - ((vp.getExtent().getWidth() * factor) / 2.0);<br>

 *   double nuevoY = p2.getY() - ((vp.getExtent().getHeight() * factor) / 2.0);<br>

 *   r.x = nuevoX;<br>

 *   r.y = nuevoY;<br>

 *   r.width = vp.getExtent().getWidth() * factor;<br>

 *   r.height = vp.getExtent().getHeight() * factor;<br>

 *   vp.setExtent(r);

 *  </code>

 * </p>

 *

 * <p>The ultimately extent will be an adaptation from that, calculated by the <code>ViewPort</code>

 *  bearing in mind the ratio of the available rectangle.</p>

 *

 * @see MapContext#ZOOMOUTFACTOR

 * @see ViewPort#setEnvelope(Envelope)

 * @see ZoomInListenerImpl

 * @see ZoomOutRightButtonListener

 *

 * @author Vicente Caballero Navarro

 */

public class ZoomOutListenerImpl implements PointListener {

        private static final GeometryManager geomManager = GeometryLocator.getGeometryManager();

        private static final Logger logger = LoggerFactory.getLogger(ZoomOutListenerImpl.class);

        /**

         * The image to display when the cursor is active.

         */

//        private final Image izoomout = new ImageIcon(MapControl.class.getClassLoader().getResource(

//                                "org/gvsig/fmap/mapcontrol/images/ZoomOutCursor.gif")).getImage();

        /**

         * Reference to the <code>MapControl</code> object that uses.

         */

        private MapControl mapControl;

        /**

         * <p>Creates a new <code>ZoomOutListenerImpl</code> object.</p>

         *

         * @param mapControl the <code>MapControl</code> where will be applied the changes

         */

        public ZoomOutListenerImpl(MapControl mapControl) {

                this.mapControl = mapControl;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PointListener#point(com.iver.cit.gvsig.fmap.tools.Events.PointEvent)

         */

        public void point(PointEvent event) {

                ViewPort vp = mapControl.getMapContext().getViewPort();

                Point2D p2 = vp.toMapPoint(event.getPoint());

                double nuevoX;

                double nuevoY;

                double factor = 1/MapContext.ZOOMOUTFACTOR;

                nuevoX = p2.getX() - ((vp.getExtent().getWidth() * factor) / 2.0);

                nuevoY = p2.getY() - ((vp.getExtent().getHeight() * factor) / 2.0);

                double x = nuevoX;

                double y = nuevoY;

                double width = vp.getExtent().getWidth() * factor;

                double height = vp.getExtent().getHeight() * factor;

                Envelope r;

                try {

                        r = geomManager.createEnvelope(x,y, x+width, y+height, SUBTYPES.GEOM2D);

                        vp.setEnvelope(r);

                } catch (CreateEnvelopeException e) {

                        logger.error("Error creating the envelope", e);

                }                

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#getImageCursor()

         */

        public Image getImageCursor() {

                return IconThemeHelper.getImage("cursor-zoom-out");

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#cancelDrawing()

         */

        public boolean cancelDrawing() {

            logger.debug("cancelDrawing true");

                return true;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PointListener#pointDoubleClick(com.iver.cit.gvsig.fmap.tools.Events.PointEvent)

         */

        public void pointDoubleClick(PointEvent event) {

                // TODO Auto-generated method stub

        }

}