source: osm/applications/editors/josm/plugins/livegps/livegps/LiveGpsLayer.java@ 6160

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.gui.layer.RawGpsLayer;
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();
            }
        }
        
    }

}