source: osm/applications/editors/josm/plugins/surveyor/src/livegps/LiveGpsLayer.java@ 2974

package livegps;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
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.gui.MapView;
import org.openstreetmap.josm.gui.layer.RawGpsLayer;

public class LiveGpsLayer extends RawGpsLayer implements PropertyChangeListener {
    public final static String LAYER_NAME = "LiveGPS layer";
        LatLon lastPos;
        GpsPoint lastPoint;
        Collection<GpsPoint> trackBeingWritten;
        float speed;
        float course;
        String status;
        //JLabel lbl;
        boolean autocenter;
        
        public LiveGpsLayer(Collection<Collection<GpsPoint>> data)
        {
                super (data, LAYER_NAME, null);
                if (data.isEmpty())
                {
                        data.add(new ArrayList<GpsPoint>());
                }
                // use last track in collection:
                for (Collection<GpsPoint> track : data) { 
                    trackBeingWritten = track;
                }
                //lbl = new JLabel();
        }
        
        void setCurrentPosition(double lat, double 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 GpsPoint (thisPos, new Date().toString());
                // synchronize when adding data, as otherwise the autosave action
                // needs concurrent access and this results in an exception!
                synchronized (LiveGpsLock.class) {
                    trackBeingWritten.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();
        }
        
        void setAutoCenter(boolean ac)
        {
                autocenter = ac;
        }

        @Override public void paint(Graphics g, MapView mv)
        {
                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)
                {
                        Point screen = mv.getPoint(lastPoint.eastNorth);
                        g.setColor(Color.RED);
                        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();
            }
        }
        
    }

}