001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions;
003
004import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
005import static org.openstreetmap.josm.tools.I18n.tr;
006
007import java.awt.BorderLayout;
008import java.awt.GridBagLayout;
009import java.awt.event.ActionEvent;
010import java.awt.event.KeyEvent;
011
012import javax.swing.JLabel;
013import javax.swing.JOptionPane;
014import javax.swing.JPanel;
015import javax.swing.event.DocumentEvent;
016import javax.swing.event.DocumentListener;
017
018import org.openstreetmap.josm.Main;
019import org.openstreetmap.josm.data.Bounds;
020import org.openstreetmap.josm.data.coor.LatLon;
021import org.openstreetmap.josm.gui.MapFrame;
022import org.openstreetmap.josm.gui.MapFrameListener;
023import org.openstreetmap.josm.gui.MapView;
024import org.openstreetmap.josm.gui.dialogs.LatLonDialog;
025import org.openstreetmap.josm.gui.widgets.JosmTextField;
026import org.openstreetmap.josm.tools.GBC;
027import org.openstreetmap.josm.tools.ImageProvider;
028import org.openstreetmap.josm.tools.OsmUrlToBounds;
029import org.openstreetmap.josm.tools.Shortcut;
030
031/**
032 * Allows to jump to a specific location.
033 * @since 2575
034 */
035public class JumpToAction extends JosmAction {
036
037    /**
038     * Constructs a new {@code JumpToAction}.
039     */
040    public JumpToAction() {
041        super(tr("Jump To Position"), (ImageProvider) null, tr("Opens a dialog that allows to jump to a specific location"),
042                Shortcut.registerShortcut("tools:jumpto", tr("Tool: {0}", tr("Jump To Position")),
043                        KeyEvent.VK_J, Shortcut.CTRL), true, "action/jumpto", true);
044        putValue("help", ht("/Action/JumpToPosition"));
045    }
046
047    private final JosmTextField url = new JosmTextField();
048    private final JosmTextField lat = new JosmTextField();
049    private final JosmTextField lon = new JosmTextField();
050    private final JosmTextField zm = new JosmTextField();
051
052    class OsmURLListener implements DocumentListener {
053        @Override
054        public void changedUpdate(DocumentEvent e) {
055            parseURL();
056        }
057
058        @Override
059        public void insertUpdate(DocumentEvent e) {
060            parseURL();
061        }
062
063        @Override
064        public void removeUpdate(DocumentEvent e) {
065            parseURL();
066        }
067    }
068
069    class OsmLonLatListener implements DocumentListener {
070        @Override
071        public void changedUpdate(DocumentEvent e) {
072            updateUrl(false);
073        }
074
075        @Override
076        public void insertUpdate(DocumentEvent e) {
077            updateUrl(false);
078        }
079
080        @Override
081        public void removeUpdate(DocumentEvent e) {
082            updateUrl(false);
083        }
084    }
085
086    /**
087     * Displays the "Jump to" dialog.
088     */
089    public void showJumpToDialog() {
090        if (!Main.isDisplayingMapView()) {
091            return;
092        }
093        MapView mv = Main.map.mapView;
094        LatLon curPos = mv.getProjection().eastNorth2latlon(mv.getCenter());
095        lat.setText(Double.toString(curPos.lat()));
096        lon.setText(Double.toString(curPos.lon()));
097
098        double dist = mv.getDist100Pixel();
099        zm.setText(Long.toString(Math.round(dist*100)/100));
100        updateUrl(true);
101
102        JPanel panel = new JPanel(new BorderLayout());
103        panel.add(new JLabel("<html>"
104                              + tr("Enter Lat/Lon to jump to position.")
105                              + "<br>"
106                              + tr("You can also paste an URL from www.openstreetmap.org")
107                              + "<br>"
108                              + "</html>"),
109                  BorderLayout.NORTH);
110
111        OsmLonLatListener x = new OsmLonLatListener();
112        lat.getDocument().addDocumentListener(x);
113        lon.getDocument().addDocumentListener(x);
114        zm.getDocument().addDocumentListener(x);
115        url.getDocument().addDocumentListener(new OsmURLListener());
116
117        JPanel p = new JPanel(new GridBagLayout());
118        panel.add(p, BorderLayout.NORTH);
119
120        p.add(new JLabel(tr("Latitude")), GBC.eol());
121        p.add(lat, GBC.eol().fill(GBC.HORIZONTAL));
122
123        p.add(new JLabel(tr("Longitude")), GBC.eol());
124        p.add(lon, GBC.eol().fill(GBC.HORIZONTAL));
125
126        p.add(new JLabel(tr("Zoom (in metres)")), GBC.eol());
127        p.add(zm, GBC.eol().fill(GBC.HORIZONTAL));
128
129        p.add(new JLabel(tr("URL")), GBC.eol());
130        p.add(url, GBC.eol().fill(GBC.HORIZONTAL));
131
132        Object[] buttons = {tr("Jump there"), tr("Cancel")};
133        LatLon ll = null;
134        double zoomLvl = 100;
135        while (ll == null) {
136            int option = JOptionPane.showOptionDialog(
137                            Main.parent,
138                            panel,
139                            tr("Jump to Position"),
140                            JOptionPane.OK_CANCEL_OPTION,
141                            JOptionPane.PLAIN_MESSAGE,
142                            null,
143                            buttons,
144                            buttons[0]);
145
146            if (option != JOptionPane.OK_OPTION) return;
147            try {
148                zoomLvl = Double.parseDouble(zm.getText());
149                ll = new LatLon(Double.parseDouble(lat.getText()), Double.parseDouble(lon.getText()));
150            } catch (NumberFormatException ex) {
151                try {
152                    ll = LatLonDialog.parseLatLon(lat.getText() + "; " + lon.getText());
153                } catch (IllegalArgumentException ex2) {
154                    JOptionPane.showMessageDialog(Main.parent,
155                            tr("Could not parse Latitude, Longitude or Zoom. Please check."),
156                            tr("Unable to parse Lon/Lat"), JOptionPane.ERROR_MESSAGE);
157                }
158            }
159        }
160
161        double zoomFactor = 1/dist;
162        mv.zoomToFactor(mv.getProjection().latlon2eastNorth(ll), zoomFactor * zoomLvl);
163    }
164
165    private void parseURL() {
166        if (!url.hasFocus()) return;
167        String urlText = url.getText();
168        Bounds b = OsmUrlToBounds.parse(urlText);
169        if (b != null) {
170            lat.setText(Double.toString((b.getMinLat() + b.getMaxLat())/2));
171            lon.setText(Double.toString((b.getMinLon() + b.getMaxLon())/2));
172
173            int zoomLvl = 16;
174            int hashIndex = urlText.indexOf("#map");
175            if (hashIndex >= 0) {
176                zoomLvl = Integer.parseInt(urlText.substring(hashIndex+5, urlText.indexOf('/', hashIndex)));
177            } else {
178                String[] args = urlText.substring(urlText.indexOf('?')+1).split("&");
179                for (String arg : args) {
180                    int eq = arg.indexOf('=');
181                    if (eq == -1 || !"zoom".equalsIgnoreCase(arg.substring(0, eq))) continue;
182
183                    zoomLvl = Integer.parseInt(arg.substring(eq + 1));
184                    break;
185                }
186            }
187
188            // 10 000 000 = 10 000 * 1000 = World * (km -> m)
189            zm.setText(Double.toString(Math.round(10000000d * Math.pow(2d, (-1d) * zoomLvl))));
190        }
191    }
192
193    private void updateUrl(boolean force) {
194        if (!lat.hasFocus() && !lon.hasFocus() && !zm.hasFocus() && !force) return;
195        try {
196            double dlat = Double.parseDouble(lat.getText());
197            double dlon = Double.parseDouble(lon.getText());
198            double m = Double.parseDouble(zm.getText());
199            // Inverse function to the one above. 18 is the current maximum zoom
200            // available on standard renderers, so choose this is in case m should be zero
201            int zoomLvl = 18;
202            if (m > 0)
203                zoomLvl = (int) Math.round((-1) * Math.log(m/10000000)/Math.log(2));
204
205            url.setText(OsmUrlToBounds.getURL(dlat, dlon, zoomLvl));
206        } catch (NumberFormatException x) {
207            Main.debug(x.getMessage());
208        }
209    }
210
211    @Override
212    public void actionPerformed(ActionEvent e) {
213        showJumpToDialog();
214    }
215
216    @Override
217    protected void updateEnabledState() {
218        setEnabled(Main.isDisplayingMapView());
219    }
220
221    @Override
222    protected void installAdapters() {
223        super.installAdapters();
224        // make this action listen to mapframe change events
225        Main.addMapFrameListener(new MapFrameListener() {
226            @Override
227            public void mapFrameInitialized(MapFrame oldFrame, MapFrame newFrame) {
228                updateEnabledState();
229            }
230        });
231    }
232}