Application: gvSIG desktop

/**

 * 

 */

package com.iver.cit.gvsig.project.documents.view.toolListeners;

import java.awt.Cursor;

import java.awt.Image;

import java.awt.Point;

import java.awt.Toolkit;

import java.awt.event.InputEvent;

import java.awt.event.MouseEvent;

import java.awt.geom.Rectangle2D;

import javax.swing.ImageIcon;

import com.iver.cit.gvsig.fmap.MapControl;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.tools.BehaviorException;

import com.iver.cit.gvsig.fmap.tools.Events.MoveEvent;

import com.iver.cit.gvsig.fmap.tools.Events.RectangleEvent;

import com.iver.cit.gvsig.fmap.tools.Listeners.PanListener;

import com.iver.cit.gvsig.fmap.tools.Listeners.RectangleListener;

import com.iver.cit.gvsig.project.documents.view.MapOverview;

/**

 * <p>Listener for changes of the zoom caused by selecting a rectangular area on the associated

 *  {@link MapOverview MapOverview} object with the first button of the mouse.</p>

 *

 * <p>If the kind of action was a movement on the associated object,

 *  updates the <i>extent</i> of its rectangular area.</p>

 * 

 * <p>If the kind of action is the selection of a rectangular area, and is bigger than 3x3 pixels,

 *  applies a <i>zoom in</i> operation centering its <code>ViewPort</code> according the equivalent <i>extent</i>

 *  in map coordinates.</p>

 * 

 * @see ViewPort

 * 

 * @author jmvivo

 */

public class MapOverviewChangeZoomListener implements RectangleListener, PanListener {

        /**

         * The image to display when the cursor is active.

         */

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

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

        /**

         * 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.

         */

        protected MapControl mapControl;

        /**

         * <p>Creates a new listener for changes of zoom at the associated {@link MapOverview MapOverview} object.</p>

         *

         * @param mapControl the <code>MapControl</code> object which represents the <code>MapOverview</code>  

         */

        public MapOverviewChangeZoomListener(MapControl mapControl) {

                this.mapControl=mapControl;

        }

        /*

         * (non-Javadoc)

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

         */

        public void rectangle(RectangleEvent event) throws BehaviorException {

                if (!checkModifiers(event.getEvent())){

                        return;

                }

                MapOverview mov=(MapOverview) this.mapControl;

                ViewPort vpView=mov.getAssociatedMapContext().getViewPort();

                ViewPort vp = mov.getViewPort();

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

                        // Recuperamos las coordenadas del evento en px

                        Rectangle2D pxRectangle = event.getPixelCoordRect();

                        // Recuperamos las coordenadas del evento en coordenadas de la vista de localizador

                        Rectangle2D realRectangle = event.getWorldCoordRect();                        

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

                        {

                                // rectangulo < 3 px no hacemos nada

                                return;

                        } else {

                                // Cambiamos la extension de la vista asociada al localizador

                                vpView.setExtent(realRectangle);                                

                        }

                }

        }

        /*

         * (non-Javadoc)

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

         */

        public Cursor getCursor() {

                return this.cur;

        }

        /* (non-Javadoc)

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

         */

        public boolean cancelDrawing() {                

                return true; //???

        }

        /*

         * (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) throws BehaviorException {

                if (!checkModifiers(event.getEvent())){

                        return;

                }

                System.out.println("mapOvervierChangeZoom");

                MapOverview mov=(MapOverview) this.mapControl;

                ViewPort vpView=mov.getAssociatedMapContext().getViewPort();

                ViewPort vp = mov.getViewPort();        

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

                        // Creamos un recuadro con las coordenadas del raton

                        // traducidas a la del mapa

                        Rectangle2D realRectangle = new Rectangle2D.Double();                        

                        realRectangle.setFrameFromDiagonal(vp.toMapPoint(event.getFrom()),vp.toMapPoint(event.getTo()));                        

                        // Establecemos la forma

                        mov.refreshOverView(realRectangle);

                }

        }

        /** 

         * Determines if has pressed the button 1 of the mouse.

         */

        private boolean checkModifiers(MouseEvent event) {        

                int modifiers = event.getModifiers();

                int keyPressedMask = InputEvent.BUTTON1_MASK;

                return ((modifiers & keyPressedMask) == keyPressedMask);

        }

}