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