| gvSIG desktop 1

/* 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.Rectangle2D;

import java.net.URL;

import javax.swing.ImageIcon;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

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.EnvelopeEvent;

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

/**

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

 *  object, defining a rectangular area.</p>

 *

 * <p>If the area defined is smaller than 3 pixels x 3 pixels holds the zoom, otherwise, calculates the new extent <i>r</i>

 *  with this equations:

 *  <code><br>

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

 *         Rectangle2D rect = event.getWorldCoordRect();<br>

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

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

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

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

 *   Rectangle2D.Double r; // This will be the new extent<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 where display the graphical information.</p>

 *

 * @see MapContext#ZOOMINFACTOR

 * @see ViewPort#setEnvelope(Envelope)

 * @see ZoomOutListenerImpl

 * @see ZoomOutRightButtonListener

 *

 * @author Vicente Caballero Navarro

 */

public class ZoomInListenerImpl implements RectangleListener {

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

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

        /**

         * The image to display when the cursor is active.

         */

        private final Image izoomin;

        /**

         * The cursor used to work with this tool listener.

         *

         * @see #getCursor()

         */

//        private Cursor cur = Toolkit.getDefaultToolkit().createCustomCursor(izoomin,

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

        /**

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

         */

        private MapControl mapCtrl;

    /**

     * 

     */

    public ZoomInListenerImpl() {

        URL res = MapControl.class.getResource("images/ZoomInCursor.gif");

        if( res == null ) {

            this.izoomin = new ImageIcon().getImage();

            logger.error("Can't load icon 'images/ZoomInCursor.gif'");

        } else {

            this.izoomin = new ImageIcon(res).getImage();

        }

    }

    /**

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

         *

         * @param mapCtrl the <code>MapControl</code> where is defined the rectangle

         */

        public ZoomInListenerImpl(MapControl mapCtrl) {

            this();

                this.mapCtrl = mapCtrl;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.RectangleListener#rectangle(com.iver.cit.gvsig.fmap.tools.Events.RectangleEvent)

         */

        public void rectangle(EnvelopeEvent event) {

                Envelope rect = event.getWorldCoordRect();

                Rectangle2D pixelRect = event.getPixelCoordRect();

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

                if ((pixelRect.getWidth() < 3) && (pixelRect.getHeight() < 3))

                {

                        if (vp.getExtent()!=null){

                                double factor = 1/MapContext.ZOOMINFACTOR;

                                double x = rect.getMaximum(0) -

                                        ((vp.getExtent().getWidth() * factor) / 2.0);

                                double y = rect.getMaximum(1) -

                                        ((vp.getExtent().getHeight() * factor) / 2.0);

                                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);

                                }

                        }

                }

                else

                {

                    vp.setEnvelope(event.getWorldCoordRect());

                }

        }

        /*

         * (non-Javadoc)

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

         */

        public Image getImageCursor() {

                return izoomin;

        }

        /*

         * (non-Javadoc)

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

         */

        public boolean cancelDrawing() {

            logger.debug("cancelDrawing true");

                return true;

        }

}