Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.mapcontrol.tools;

import java.awt.Image;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

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.ViewPort;

import org.gvsig.fmap.mapcontrol.MapControl;

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

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

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * <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 {

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

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

        /**

         * The image to display when the cursor is active.

         */

//        private final Image ipan = PluginServices.getIconTheme().get("cursor-pan").getImage();

        /**

         * 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();

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

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

                Rectangle2D extent = vp.getExtent();

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

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

                double width = extent.getWidth();

                double height = extent.getHeight();

                Envelope r;

                try {

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

                        vp.setEnvelope(r);

                } catch (CreateEnvelopeException e) {

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

                }

        }

        /*

         * (non-Javadoc)

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

         */

        public Image getImageCursor() {

                return IconThemeHelper.getImage("cursor-pan");

        }

        /*

         * (non-Javadoc)

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

         */

        public boolean cancelDrawing() {

                return true;

        }

}