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LiveGpsLayer.java

package livegps;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.gpx.GpxData;
import org.openstreetmap.josm.data.gpx.GpxTrack;
import org.openstreetmap.josm.data.gpx.WayPoint;
import org.openstreetmap.josm.gui.MapView;
import org.openstreetmap.josm.gui.layer.GpxLayer;
import org.openstreetmap.josm.tools.ColorHelper;

public class LiveGpsLayer extends GpxLayer implements PropertyChangeListener {
    public static final String LAYER_NAME = "LiveGPS layer";
    public static final String KEY_LIVEGPS_COLOR ="color.livegps.position";
      LatLon lastPos;
      WayPoint lastPoint;
      GpxTrack trackBeingWritten;
      Collection<WayPoint> trackSegment;
      float speed;
      float course;
      String status;
      //JLabel lbl;
      boolean autocenter;
      private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
      
      public LiveGpsLayer(GpxData data)
      {
            super (data, LAYER_NAME);
            trackBeingWritten = new GpxTrack();
            trackBeingWritten.attr.put("desc", "josm live gps");
            trackSegment = new ArrayList<WayPoint>();
            trackBeingWritten.trackSegs.add(trackSegment);
            data.tracks.add(trackBeingWritten);
      }
      
      void setCurrentPosition(double lat, double lon)
      {
          //System.out.println("adding pos " + lat + "," + lon);
            LatLon thisPos = new LatLon(lat, lon);
            if ((lastPos != null) && (thisPos.equalsEpsilon(lastPos))) {
                  // no change in position
                  // maybe show a "paused" cursor or some such
                  return;
            }
                  
            lastPos = thisPos;
            lastPoint = new WayPoint(thisPos);
            lastPoint.attr.put("time", dateFormat.format(new Date()));
            // synchronize when adding data, as otherwise the autosave action
            // needs concurrent access and this results in an exception!
            synchronized (LiveGpsLock.class) {
                trackSegment.add(lastPoint);            
        }
            if (autocenter) {
                center();
            }
            
            //Main.map.repaint();
      }

      public void center()
      {
            if (lastPoint != null) 
                  Main.map.mapView.zoomTo(lastPoint.eastNorth, Main.map.mapView.getScale());
      }
      
//    void setStatus(String status)
//    {
//          this.status = status;
//          Main.map.repaint();
//        System.out.println("LiveGps status: " + status);
//    }
      
      void setSpeed(float metresPerSecond)
      {
            speed = metresPerSecond;
            //Main.map.repaint();
      }

      void setCourse(float degrees)
      {
            course = degrees;
            //Main.map.repaint();
      }
      
      public void setAutoCenter(boolean ac)
      {
            autocenter = ac;
      }

      @Override public void paint(Graphics g, MapView mv)
      {
          //System.out.println("in paint");
          synchronized (LiveGpsLock.class) {
              //System.out.println("in synced paint");
              super.paint(g, mv);
//            int statusHeight = 50;
//            Rectangle mvs = mv.getBounds();
//            mvs.y = mvs.y + mvs.height - statusHeight;
//            mvs.height = statusHeight;
//            g.setColor(new Color(1.0f, 1.0f, 1.0f, 0.8f)); 
//            g.fillRect(mvs.x, mvs.y, mvs.width, mvs.height);

              
              if (lastPoint != null)
              {
                  String colorString = Main.pref.get(KEY_LIVEGPS_COLOR);
                  if(colorString.length() == 0) {
                      colorString = ColorHelper.color2html(Color.RED);
                      Main.pref.put(KEY_LIVEGPS_COLOR, colorString);
                  }
                  Color color = ColorHelper.html2color(colorString);
                  Point screen = mv.getPoint(lastPoint.eastNorth);
                  g.setColor(color);
                  g.drawOval(screen.x-10, screen.y-10,20,20);
                  g.drawOval(screen.x-9, screen.y-9,18,18);
              }

//            lbl.setText("gpsd: "+status+" Speed: " + speed + " Course: "+course);
//            lbl.setBounds(0, 0, mvs.width-10, mvs.height-10);
//            Graphics sub = g.create(mvs.x+5, mvs.y+5, mvs.width-10, mvs.height-10);
//            lbl.paint(sub);

//            if(status != null) {
//            g.setColor(Color.WHITE);
//            g.drawString("gpsd: " + status, 5, mv.getBounds().height - 15); // lower left corner
//            }
          }
      }
    
    /* (non-Javadoc)
     * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
     */
    public void propertyChange(PropertyChangeEvent evt) {
        if(!visible) {
            return;
        }
        if("gpsdata".equals(evt.getPropertyName())) {
            LiveGpsData data = (LiveGpsData) evt.getNewValue();
            if(data.isFix()) {
                setCurrentPosition(data.getLatitude(), data.getLongitude());
                if(!Float.isNaN(data.getSpeed())) {
                    setSpeed(data.getSpeed());
                }
                if(!Float.isNaN(data.getCourse())) {
                    setCourse(data.getCourse());
                }
                Main.map.repaint();
            }
        }
        
    }

}

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