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.Image;

import java.awt.geom.Point2D;

import java.text.NumberFormat;

import org.cresques.cts.IProjection;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.ui.mdiFrame.MainFrame;

import org.gvsig.fmap.mapcontext.MapContext;

import org.gvsig.fmap.mapcontrol.MapControl;

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

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

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

/**

 * <p>Listener that displays at the status bar of the application's main frame, the value of the point coordinates of the mouse's

 *  cursor on the associated <code>MapControl</code>, just as is received a <code>PointEvent</code> event.</p>

 *

 * <p>Calculates the coordinates equivalent to the point according this rules:

 *  <ul>

 *   <li>uses <i><code>formatDegrees(p.get{X or Y}()</code></i> if the associated <code>MapControl</code> object isn't projected.</li>

 *   <li>uses <i><code>formatDegrees({MapControl's projection}.toGeo(p.get{X or Y}())</code></i> if the associated

 *    <code>MapControl</code> object is projected and its <code>ViewPort</code>'s distance units are in degrees.</li>

 *   <li>uses <i><code>{NumberFormat according to {@link #setFractionDigits(Point2D) #setFractionDigits(Point2D)}}.format((p.get{X or Y}()/MapContext.CHANGEM[mapControl.getViewPort().getDistanceUnits()])*MapContext.CHANGEM[mapControl.getViewPort().getMapUnits()])</code></i>

 *    otherwise.</li>

 *  </ul>

 * </p>

 *

 * <p>The <u>prefix</u> of the coordinate expressions will be:

 *  <ul>

 *   <li>Longitude "<i>Long =</i>" and latitude "<i>Lat =</i>", if the associated <i>MapControl</i> object isn't projected, or the current distance unit

 *    of the <code>MapControl</code>'s view port is in degrees.</li>

 *   <li>X "<i>X =</i>" and Y "<i>Y =</i>", otherwise.</li>

 *  </ul>

 * </p>

 *

 * <p>And the <u>sufix</u> value:

 *  <ul>

 *   <li>If the associated <i>MapControl</i> object isn't projected, or the current distance unit

 *    of the <code>MapControl</code>'s view port is in degrees(expected latitude or longitude), according this pattern:<br>

 *    <code><b><i>S?G? M' S''</i></b></code>, having:<br>

 *    <ul>

 *     <li><i>S?</i> : optionally, if the value is negative, sets a "-" symbol.</li>

 *     <li><i>G</i> : equivalent grades.</li>

 *     <li><i>M</i> : equivalent minutes.</li>

 *     <li><i>S</i> : equivalent seconds.</li>

 *    </ul>

 *   </li>

 *   <li>Otherwise a decimal number according this rules:

 *    <ul>

 *     <li><i>8 decimals</i>, if is using any of the following geographic coordinate systems:

 *      <ul>

 *       <li><i>EPSG:4230 (known as <a href="http://en.wikipedia.org/wiki/ED50">ED50</a>)</i>.</li>

 *       <li><i>EPSG:4326 (known as <a href="http://en.wikipedia.org/wiki/WGS84">WGS84</a>)</i>.</li>

 *      </ul>

 *     <li><i>2 decimals</i>, otherwise.</li>

 *    </ul>

 *   </li>

 *  </ul>

 * </p>

 *

 * @author Vicente Caballero Navarro

 */

public class StatusBarListener implements PointListener {

        /**

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

         */

        private MapControl mapControl = null;

        /**

         * Format of the coordinates. Is used to set the number of decimals.

         */

        private NumberFormat nf = null;

        /**

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

         *

         * @param mc the <code>MapControl</code> where will be applied the changes

         */

        public StatusBarListener(MapControl mc) {

                mapControl = mc;

                nf = NumberFormat.getInstance();

                nf.setMaximumFractionDigits(2);

        }

        /*

         * (non-Javadoc)

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

         */

        public Image getImageCursor() {

                return null;

        }

        /*

         * (non-Javadoc)

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

         */

        public boolean cancelDrawing() {

                return false;

        }

        /*

         * 050211, jmorell: M?todo modificado para mejorar la manera de mostrar las

         * coordenadas geod?sicas en la barra de estado. Muestra Lat y Lon y aumenta

         * el n?mero de decimales para cuando trabajemos en coordenadas geod?sicas.

         *

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PointListener#point(com.iver.cit.gvsig.fmap.tools.Events.PointEvent)

         */

        public void point(PointEvent event) throws BehaviorException {

                String[] axisText = new String[2];

                axisText[0] = "X = ";

                axisText[1] = "Y = ";

                Point2D p = mapControl.getMapContext().getViewPort().toMapPoint(event.getPoint());

                setFractionDigits(p);

                axisText = setCoorDisplayText(axisText);

                MainFrame mF = PluginServices.getMainFrame();

                if (mF != null){

                        mF.getStatusBar().setMessage("units",

                            PluginServices.getText(this, MapContext.getDistanceNames()[mapControl.getMapContext().getViewPort().getDistanceUnits()]));

                        // FJP: No se debe llamar a setControlValue desde aqu?, porque

            // cambia la escala, y con ella el viewPort (adem?s, de

            // la vista que no es).

            // mF.getStatusBar().setControlValue("scale",String.valueOf(mapControl.getMapContext().getScaleView()));

            // Fin

                        mF.getStatusBar().setMessage("projection", mapControl.getViewPort().getProjection().getAbrev());

                        String[] coords=getCoords(p);

                        mF.getStatusBar().setMessage("x", axisText[0] + coords[0]);

                        mF.getStatusBar().setMessage("y", axisText[1] + coords[1]);

                }

        }

        /**

         * <p>Sets the number of decimals of the coordinates that will be displayed, according the current projection

         *  of the associated <code>MapControl</code>:

         *  <ul>

         *   <li><i>8 decimals</i>, if is using geographical coordinates:

         *    <ul>

         *     <li><i>EPSG:4230 (known as <a href="http://en.wikipedia.org/wiki/ED50">ED50</a>)</i>.</li>

         *     <li><i>EPSG:4326 (known as <a href="http://en.wikipedia.org/wiki/WGS84">WGS84</a>)</i>.</li>

         *    </ul>

         *   <li><i>2 decimals</i>, otherwise.</li>

         *  </ul>

         * </p>

         *

         * @param p unused parameter

         *

         * @version 050211

         * @author jmorell.

         */

        public void setFractionDigits(Point2D p) {

                IProjection iProj = mapControl.getMapContext().getProjection();

                if (!iProj.isProjected()) {

                        nf.setMaximumFractionDigits(8);

                } else {

                        nf.setMaximumFractionDigits(2);

                }

        }

        /**

         * <p>Gets the name of the coordinates:

         *  <ul>

         *   <li><i>Longitude</i> and <i>Latitude</i>, if the associated <i>MapControl</i> object isn't projected, or the current distance unit

         *    of the <code>MapControl</code>'s view port is in degrees.</li>

         *   <li><i>X</i> and <i>Y</i>, otherwise.</li>

         *  </ul>

         * </p>

         *

         * @param p array of at least two <code>String</code>, where text will be stored and returned

         *

         * @return text describing the coordinate value:

         *  <ul>

         *   <li>If isn't projected:

         *    <ul>

         *     <li><code>String[0]</code> : "Long = "</li>

         *     <li><code>String[1]</code> : "Lat = "</li>

         *    </ul>

         *   </li>

         *   <li>Otherwise:

         *    <ul>

         *     <li><code>String[0]</code> : "X = "</li>

         *     <li><code>String[1]</code> : "Y = "</li>

         *    </ul>

         *   </li>

         *  </ul>

         *

         * @version 050211

         * @author jmorell

         */

        public String[] setCoorDisplayText(String[] axisText) {

                IProjection iProj = mapControl.getMapContext().getProjection();

                if (!iProj.isProjected() || MapContext.getDistanceNames()[mapControl.getMapContext().getViewPort().getDistanceUnits()].equals("Grados")) {

                        axisText[0] = "Lon = ";

                        axisText[1] = "Lat = ";

                } else {

                        axisText[0] = "X = ";

                        axisText[1] = "Y = ";

                }

                return axisText;

        }

        /**

         * <p>Converts a decimal value (expected latitude or longitude) in degrees, and formats it according this pattern:<br>

         *  <code><b><i>S?G? M' S''</i></b></code>, having:<br>

         *  <ul>

         *   <li><i>S?</i> : optionally, if the value is negative, sets a "-" symbol.</li>

         *   <li><i>G</i> : equivalent grades.</li>

         *   <li><i>M</i> : equivalent minutes.</li>

         *   <li><i>S</i> : equivalent seconds.</li>

         *  </ul>

         * </p>

         *

         * @param d the latitude or longitude value to convert

         *

         * @return value formatted in degrees

         */

        private String formatDegrees(double d) {

                String signo = d<0 ? "-" : "";

                d = Math.abs(d);

                long grado = 0;

                double minuto = 0;

                double segundo = 0;

                grado = (long)(d);

                minuto = (d - grado) * 60;

                segundo = (minuto - (long) minuto)*60;

//                System.out.println("Grados: " + grado);

//                System.out.println("Minutos: " + minuto);

//                System.out.println("Segundos: " + segundo);

                return signo+grado+"? "+(long) minuto+"' "+(long)segundo+"''";

        }

        /**

         * <p>Returns the coordinates equivalent to <code>p</code>:

         *  <ul>

         *   <li>Uses <i><code>formatDegrees(p.get{X or Y}()</code></i> if the associated <code>MapControl</code> object isn't projected.</li>

         *   <li>Uses <i><code>formatDegrees({MapControl's projection}.toGeo(p.get{X or Y}())</code></i> if the associated

         *    <code>MapControl</code> object is projected and its <code>ViewPort</code>'s distance units are in degrees.</li>

         *   <li>Uses <i><code>{NumberFormat according to {@link #setFractionDigits(Point2D) #setFractionDigits(Point2D)}}.format((p.get{X or Y}()/MapContext.CHANGEM[mapControl.getViewPort().getDistanceUnits()])*MapContext.CHANGEM[mapControl.getViewPort().getMapUnits()])</code></i>

         *    otherwise.</li>

         *  </ul>

         * </p>

         *

         * @param p point 2D to convert in text coordinates according the projection of the associated <code>MapControl</code> and the

         *  distance units of its <code>ViewPort</code>.

         *

         * @return coordinates equivalent to <code>p</code>, according to the algorithm explained up

         */

        public String[] getCoords(Point2D p) {

                String[] coords=new String[2];

                IProjection iProj = mapControl.getMapContext().getProjection();

                if (!iProj.isProjected()) {

                        coords[0]=String.valueOf(formatDegrees(p.getX()));

                        coords[1]=String.valueOf(formatDegrees(p.getY()));

                } else {

                        double[] trans2Meter=MapContext.getDistanceTrans2Meter();

                        if (PluginServices.getText(this,MapContext.getDistanceNames()[mapControl.getViewPort().getDistanceUnits()]).equals(PluginServices.getText(this,"Grados"))) {

                                Point2D pgeo=iProj.toGeo(p);

                                coords[0]=String.valueOf(formatDegrees(pgeo.getX()));

                                coords[1]=String.valueOf(formatDegrees(pgeo.getY()));

                        }else {

                                if (PluginServices.getText(this,MapContext.getDistanceNames()[mapControl.getViewPort().getMapUnits()]).equals(PluginServices.getText(this,"Grados"))) {

                                        mapControl.getViewPort().setMapUnits(1);

                                }

                                coords[0]=String.valueOf(nf.format((p.getX()/trans2Meter[mapControl.getViewPort().getDistanceUnits()])*trans2Meter[mapControl.getViewPort().getMapUnits()]));

                                coords[1]=String.valueOf(nf.format((p.getY()/trans2Meter[mapControl.getViewPort().getDistanceUnits()])*trans2Meter[mapControl.getViewPort().getMapUnits()]));

                        }

                }

                return coords;

        }

        /*

         * (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.tools.Listeners.PointListener#pointDoubleClick(com.iver.cit.gvsig.fmap.tools.Events.PointEvent)

         */

        public void pointDoubleClick(PointEvent event) throws BehaviorException {

                // TODO Auto-generated method stub

        }

}