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.Cursor;

import java.awt.Image;

import java.awt.Point;

import java.awt.Toolkit;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import javax.swing.ImageIcon;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontrol.MapControl;

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

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

/**

 * <p>Listener for moving the extent of the associated {@link MapControl MapControl} object

 *  according the movement between the initial and final points of line determined by the movement

 *  dragging with the third button of the mouse.</p>

 * 

 * <p>Updates the extent of its <code>ViewPort</code> with the new position.</p>

 *

 * @author Vicente Caballero Navarro

 */

public class PanListenerImpl implements PanListener {

        /**

         * The image to display when the cursor is active.

         */

        private final Image ipan = new ImageIcon(MapControl.class.getResource(

                                "images/Hand.gif")).getImage();

        /**

         * The cursor used to work with this tool listener.

         * 

         * @see #getCursor()

         */

        private Cursor cur = Toolkit.getDefaultToolkit().createCustomCursor(ipan,

                        new Point(16, 16), "");

        /**

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

         */

        private MapControl mapControl;

        /**

           * <p>Creates a new listener for changing the position of the extent of the associated {@link MapControl MapControl} object.</p>

         * 

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

         */

        public PanListenerImpl(MapControl mapControl) {

                this.mapControl = mapControl;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PanListener#move(com.iver.cit.gvsig.fmap.tools.Events.MoveEvent)

         */

        public void move(MoveEvent event) {

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

                // System.out.println(vp);

                Point2D from = vp.toMapPoint(event.getFrom());

                Point2D to = vp.toMapPoint(event.getTo());

                Rectangle2D.Double r = new Rectangle2D.Double();

                Rectangle2D extent = vp.getExtent();

                r.x = extent.getX() - (to.getX() - from.getX());

                r.y = extent.getY() - (to.getY() - from.getY());

                r.width = extent.getWidth();

                r.height = extent.getHeight();

                vp.setExtent(r);

                mapControl.getMapContext().clearAllCachingImageDrawnLayers();

                // mapControl.drawMap();

        }

        /*

         * (non-Javadoc)

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

         */

        public Cursor getCursor() {

                return cur;

        }

        /*

         * (non-Javadoc)

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

         */

        public boolean cancelDrawing() {

                return true;

        }

}