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.app.project.documents.view.toolListeners;

import java.awt.geom.Point2D;

import java.text.NumberFormat;

import java.util.Locale;

import org.cresques.cts.IProjection;

import org.geotools.measure.AngleFormat;

import org.gvsig.andami.PluginServices;

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontrol.MapControl;

import org.gvsig.fmap.mapcontrol.tools.MeasureListenerImpl;

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

/**

 * <p>Listener for calculating distances using vertexes of a polyline, defined in the associated {@link MapControl MapControl}

 *  object, and displaying that information at the status bar of the application's main frame.</p>

 *

 * <p>Calculates and displays:

 *  <ul>

 *   <li>Distance of the last segment of the polyline.</li>

 *   <li>Accumulated distance of all segments of the polyline.</li>

 *  </ul>

 * </p>

 *

 * @see MeasureListenerImpl

 *

 * @author Vicente Caballero Navarro

 */

public class MeasureListener extends MeasureListenerImpl {

        /**

         * <p>Creates a new listener for calculating distances using points of a polyline.</p>

         *

         * @param mc the <code>MapControl</code> where is calculated the length

         */

        public MeasureListener(MapControl mc) {

                super(mc);

        }

        /*

         * (non-Javadoc)

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

         */

        public void points(MeasureEvent event) {

                double dist = 0;

                double distAll = 0;

                double angle = 0;

                double sin = 0;

                double cos = 0;

                double dm = 0;

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

                IProjection proj = mapCtrl.getMapContext().getProjection();

                Point2D p = new Point2D.Double(event.getXs()[0].doubleValue(),event.getYs()[0].doubleValue());//vp.toMapPoint(new Point(event.getXs()[0].intValue(),event.getYs()[0].intValue()));

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

                        Point2D p2 = new Point2D.Double(event.getXs()[i].doubleValue(),        event.getYs()[i].doubleValue());// vp.toMapPoint(new Point(event.getXs()[i].intValue(),event.getYs()[i].intValue()));

                        dist = vp.distanceWorld(p, p2);

                        distAll += dist;

                        if (proj.isProjected()) {

                                dm = p.distance(p2);

                                sin = (p2.getX() - p.getX()) / dm;

                                cos = (p2.getY() - p.getY()) / dm;

                                if (sin >= 0) {

                                        angle = Math.toDegrees(Math.acos(cos));

                                } else {

                                        angle = 360 - Math.toDegrees(Math.acos(cos));

                                }

                        }

                        p = p2;

                }

                NumberFormat nf = NumberFormat.getInstance();

                AngleFormat af = AngleFormat.getInstance(Locale.getDefault());

        nf.setMaximumFractionDigits(2);

        if (PluginServices.getMainFrame() != null)

        {

                double[] trans2Meter=MapContext.getDistanceTrans2Meter();

            int distanceUnits = mapCtrl.getViewPort().getDistanceUnits();

                        PluginServices.getMainFrame().getStatusBar().setMessage("4",

                            "P=" + nf.format(dist/trans2Meter[distanceUnits]) + " " + MapContext.getDistanceAbbr()[distanceUnits]);

                    PluginServices.getMainFrame().getStatusBar().setMessage("5",

                            "T=" + nf.format(distAll/trans2Meter[distanceUnits]) + " " + MapContext.getDistanceAbbr()[distanceUnits]);

                    //

                    // El calculo del azimut esta pensado para trabajar en coordenadas proyectadas (metros)

                    // y probablemente cuando se esten usando coordenadas en lat/lang se generen resultados

                    // erroneos, asi que solo se calcula y muestra el azimut si la proyeccion es proyectada.

                    //

                    if( proj.isProjected() ) {

                            PluginServices.getMainFrame().getStatusBar().setMessage("azimut",

                                        "Azimut:" + af.format(angle) + "");

                    } else {

                            PluginServices.getMainFrame().getStatusBar().setMessage("azimut",

                                        "Azimut: (not available)");

                    }

        }

        }

}