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Sourcecode: josm version File versions  Download package

BoundingBoxSelection.java

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.gui.download;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.HashMap;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Bounds;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.tools.GBC;
/**
 * Bounding box selector.
 * 
 * Provides max/min lat/lon input fields as well as the "URL from www.openstreetmap.org" text field.
 * 
 * @author Frederik Ramm <frederik@remote.org>
 *
 */
00036 public class BoundingBoxSelection implements DownloadSelection {

      private JTextField[] latlon = new JTextField[] {
                  new JTextField(11),
                  new JTextField(11),
                  new JTextField(11),
                  new JTextField(11) };
      final JTextArea osmUrl = new JTextArea();
      
      final JLabel sizeCheck = new JLabel();
      
      public void addGui(final DownloadDialog gui) {

            JPanel dlg = new JPanel(new GridBagLayout());
            osmUrl.setText(tr("You can paste an URL here to download the area."));

            final FocusListener dialogUpdater = new FocusAdapter() {
                  @Override public void focusLost(FocusEvent e) {
                        SwingUtilities.invokeLater(new Runnable() {
                              public void run() {
                                    try {
                                          double minlat = Double.parseDouble(latlon[0].getText());
                                          double minlon = Double.parseDouble(latlon[1].getText());
                                          double maxlat = Double.parseDouble(latlon[2].getText());
                                          double maxlon = Double.parseDouble(latlon[3].getText());
                                          if (minlat != gui.minlat || minlon != gui.minlon || maxlat != gui.maxlat || maxlon != gui.maxlon) {
                                                gui.minlat = minlat; gui.minlon = minlon; 
                                                gui.maxlat = maxlat; gui.maxlon = maxlon;
                                                gui.boundingBoxChanged(BoundingBoxSelection.this);
                                          }
                                    } catch (NumberFormatException x) {
                                          // ignore
                                    }
                                    updateUrl(gui);
                                    updateSizeCheck(gui);
                              }
                        });
                  }
            };
            
            for (JTextField f : latlon) {
                  f.setMinimumSize(new Dimension(100,new JTextField().getMinimumSize().height));
                  f.addFocusListener(dialogUpdater);
            }
            
            final KeyListener osmUrlRefresher = new KeyAdapter() {
                  @Override public void keyTyped(KeyEvent e) {
                        SwingUtilities.invokeLater(new Runnable() {
                              public void run() {
                                    Bounds b = osmurl2bounds(osmUrl.getText());
                                    if (b != null) {
                                          gui.minlon = b.min.lon();
                                          gui.minlat = b.min.lat();
                                          gui.maxlon = b.max.lon();
                                          gui.maxlat = b.max.lat();
                                          gui.boundingBoxChanged(BoundingBoxSelection.this);
                                          updateBboxFields(gui);
                                          updateSizeCheck(gui);
                                    }
                              }
                        });
                  }
            };
            
            osmUrl.addKeyListener(osmUrlRefresher);
            
            // select content on receiving focus. this seems to be the default in the
            // windows look+feel but not for others. needs invokeLater to avoid strange
            // side effects that will cancel out the newly made selection otherwise.
            osmUrl.addFocusListener(new FocusAdapter() {
                  @Override public void focusGained(FocusEvent e) {
                    SwingUtilities.invokeLater(new Runnable() {
                            public void run() {
                              osmUrl.selectAll();
                              }
                        });
                  }
            });
            osmUrl.setLineWrap(true);
            osmUrl.setBorder(latlon[0].getBorder());
            
            Font labelFont = sizeCheck.getFont();
            sizeCheck.setFont(labelFont.deriveFont(Font.PLAIN, labelFont.getSize()));
            
            dlg.add(new JLabel(tr("min lat")), GBC.std().insets(10,20,5,0));
            dlg.add(latlon[0], GBC.std().insets(0,20,0,0));
            dlg.add(new JLabel(tr("min lon")), GBC.std().insets(10,20,5,0));
            dlg.add(latlon[1], GBC.eol().insets(0,20,0,0));
            dlg.add(new JLabel(tr("max lat")), GBC.std().insets(10,0,5,0));
            dlg.add(latlon[2], GBC.std());
            dlg.add(new JLabel(tr("max lon")), GBC.std().insets(10,0,5,0));
            dlg.add(latlon[3], GBC.eol());
            
            dlg.add(new JLabel(tr("URL from www.openstreetmap.org")), GBC.eol().insets(10,20,5,0));
            dlg.add(osmUrl, GBC.eop().insets(10,0,5,0).fill());
            dlg.add(sizeCheck, GBC.eop().insets(10,0,5,20));

            gui.tabpane.addTab("Bounding Box", dlg);
      }
      
      /**
       * Called when bounding box is changed by one of the other download dialog tabs.
       */
00139       public void boundingBoxChanged(DownloadDialog gui) {
            updateBboxFields(gui);
            updateUrl(gui);
            updateSizeCheck(gui);
      }
      
      private void updateBboxFields(DownloadDialog gui) {
            latlon[0].setText(Double.toString(gui.minlat));
            latlon[1].setText(Double.toString(gui.minlon));
            latlon[2].setText(Double.toString(gui.maxlat));
            latlon[3].setText(Double.toString(gui.maxlon));
            for (JTextField f : latlon) 
                  f.setCaretPosition(0);
      }
      
      private void updateUrl(DownloadDialog gui) {    
            double lat = (gui.minlat + gui.maxlat)/2;
            double lon = (gui.minlon + gui.maxlon)/2;
            // convert to mercator (for calculation of zoom only)
            double latMin = Math.log(Math.tan(Math.PI/4.0+gui.minlat/180.0*Math.PI/2.0))*180.0/Math.PI;
            double latMax = Math.log(Math.tan(Math.PI/4.0+gui.maxlat/180.0*Math.PI/2.0))*180.0/Math.PI;
            double size = Math.max(Math.abs(latMax-latMin), Math.abs(gui.maxlon-gui.minlon));
            int zoom = 0;
            while (zoom <= 20) {
                  if (size >= 180)
                        break;
                  size *= 2;
                  zoom++;
            }
            osmUrl.setText("http://www.openstreetmap.org/index.html?mlat="+lat+"&mlon="+lon+"&zoom="+zoom);
      }
      
      private void updateSizeCheck(DownloadDialog gui) {
            double squareDegrees = (gui.maxlon-gui.minlon)*(gui.maxlat-gui.minlat);
            double maxBboxSize = 0.25;
            try {
                  Double.parseDouble(Main.pref.get("osm-server.max-request-area", "0.25"));
            } catch (NumberFormatException nfe) {
                  maxBboxSize = 0.25;
            }
            if (squareDegrees > maxBboxSize) {
                  sizeCheck.setText(tr("Download area too large; will probably be rejected by server"));
                  sizeCheck.setForeground(Color.red);
            } else {
                  sizeCheck.setText(tr("Download area ok, size probably acceptable to server"));
                  sizeCheck.setForeground(Color.darkGray);
            }
      }
      
      public static Bounds osmurl2bounds(String url) {
            int i = url.indexOf('?');
            if (i == -1)
                  return null;
            String[] args = url.substring(i+1).split("&");
            HashMap<String, String> map = new HashMap<String, String>();
            for (String arg : args) {
                  int eq = arg.indexOf('=');
                  if (eq != -1) {
                        map.put(arg.substring(0, eq), arg.substring(eq + 1));
                  }
            }

            Bounds b = null;
            try {
                  if (map.containsKey("bbox")) {
                        String bbox[] = map.get("bbox").split(",");
                        b = new Bounds(
                              new LatLon(Double.parseDouble(bbox[1]), Double.parseDouble(bbox[0])),
                              new LatLon(Double.parseDouble(bbox[3]), Double.parseDouble(bbox[2])));
                  
                  } else {
                        double size = 180.0 / Math.pow(2, Integer.parseInt(map.get("zoom")));
                        b = new Bounds(
                        new LatLon(parseDouble(map, "lat") - size/2, parseDouble(map, "lon") - size),
                        new LatLon(parseDouble(map, "lat") + size/2, parseDouble(map, "lon") + size));
                  }
            } catch (NumberFormatException x) {
            } catch (NullPointerException x) {
            }
            return b;
      }

      private static double parseDouble(HashMap<String, String> map, String key) {
            if (map.containsKey(key))
                  return Double.parseDouble(map.get(key));
            return Double.parseDouble(map.get("m"+key));
    }
}

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