| 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 com.iver.cit.gvsig.fmap.tools;

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

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

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

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

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

import java.awt.Cursor;

import java.awt.Image;

import java.awt.Point;

import java.awt.Toolkit;

import java.awt.geom.Point2D;

import javax.swing.ImageIcon;

/**

 * Implementaci?n de la interfaz MeasureListener como herramienta para medir el

 * ?rea.

 *

 * @author Vicente Caballero Navarro

 */

public class AreaListenerImpl implements PolylineListener {

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

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

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

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

        protected MapControl mapCtrl;

        protected MeasureEvent event;

        /**

         * Crea un nuevo AreaListenerImpl.

         *

         * @param mc MapControl.

         */

        public AreaListenerImpl(MapControl mc) {

                this.mapCtrl = mc;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PolylineListener#points(com.iver.cit.gvsig.fmap.tools.Events.MeasureEvent)

         */

        public void points(MeasureEvent event) {

                this.event = event;

                double dist = 0;

                double distAll = 0;

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

                for (int i = 0; i < (event.getXs().length - 1); i++) {

                        dist = 0;

                        Point p = new Point(event.getXs()[i].intValue(),

                                        event.getXs()[i].intValue());

                        Point p2 = new Point(event.getXs()[i + 1].intValue(),

                                        event.getXs()[i + 1].intValue());

                        ///dist = vp.toMapDistance((int) p.distance(p2));

                        dist = vp.distanceWorld(p, p2);

                        distAll += dist;

                }

                System.out.println("Per?metro = " + distAll + " ?rea = " +

                        (returnArea(vp.toMapPoint(

                                        new Point2D.Double(

                                                event.getXs()[event.getXs().length - 2].doubleValue(),

                                                event.getYs()[event.getYs().length - 2].doubleValue())))));

        }

        /**

         * Calcula el ?rea.

         *

         * @param aux ?ltimo punto.

         *

         * @return ?rea.

         */

        protected double returnArea(Point2D aux) {

                System.out.println("aux = " + aux);

                double elArea;

                //int pos=0;

                Point2D pPixel;

                Point2D p = new Point2D.Double();

                Point2D.Double pAnt = new Point2D.Double();

                //long i;

                Double[] x = event.getXs();

                Double[] y = event.getYs();

                // double baseMayor, baseMenor, altura; // De cada trapezoide

                // El area de cada pareja de puntos ser? (x2-x1) * baseMenor + (baseMayor-baseMenor)*(x2-x1)

                // Simplificando la ecuaci?n queda: (x2-x1)*((baseMayor+baseMenor)/2). Es decir, que da igual

                // qui?n es la base mayor y quien la manor.

                // si la coordenada X del punto i+1 es mayor que la del punto i => Area negativa

                // si no => Area positiva

                /*if (x.length < 2) {

                        return 0.0;

                }*/

                //i = 0;

                elArea = 0.0;

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

                for (int pos = 0; pos < x.length; pos++) {

                        pPixel = new Point2D.Double(((Double) x[pos]).doubleValue(),

                                        ((Double) y[pos]).doubleValue());

                        p = pPixel;//vp.toMapPoint(pPixel);

                        // p.x = getMapContext().toMapDistance((long)((Float) poliLinesX.get(pos)).floatValue());

                        ///System.out.println("p.x = " + p.getX());

                        // p.y = getMapContext().toMapDistance((long)((Float) poliLinesY.get(pos)).floatValue());

                        ///System.out.println("p.y = " + p.getY());

                        if (pos == 0) {

                                pAnt.x = aux.getX();

                                pAnt.y = aux.getY();

                        }

                        elArea = elArea + ((pAnt.x - p.getX()) * (pAnt.y + p.getY()));

                        pAnt.setLocation(p);

                }

                elArea = elArea + ((pAnt.x - aux.getX()) * (pAnt.y + aux.getY()));

                elArea = Math.abs(elArea / 2.0);

                return elArea*MapContext.CHANGEM[vp.getMapUnits()];

        }

        /**

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

         */

        public Cursor getCursor() {

                return cur;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PolylineListener#pointFixed(com.iver.cit.gvsig.fmap.tools.Events.MeasureEvent)

         */

        public void pointFixed(MeasureEvent event) {

        }

        /**

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PolylineListener#polylineFinished(com.iver.cit.gvsig.fmap.tools.Events.MeasureEvent)

         */

        public void polylineFinished(MeasureEvent event) {

        }

        /**

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

         */

        public boolean cancelDrawing() {

                return false;

        }

}