如何在用户点击地图时在地图(OSM)上添加标记(航点)？

Question

我想添加在地图上，每当用户点击地图上的路点。每当用户点击时，我都会得到地图上的路点，但问题是之前的路点消失了，没有显示在地图上，只有由于当前单击而绘制的wapoint才会显示出来。以下是该路点的代码。

public class MapPanel {

 public static void acc(GeoPosition loc){
  MapPanel.drawNew(loc);
}

 public  static void drawNew(GeoPosition location ){

    GeoPosition fp = new GeoPosition(location.getLatitude(),location.getLongitude());
    List<GeoPosition> track =  Arrays.asList(fp);

//       Create waypoints from the geo-positions
    Set<Waypoint> waypoints = new HashSet<Waypoint>(Arrays.asList(
            new DefaultWaypoint(fp)));
//       Create a waypoint painter that takes all the waypoints
    waypointPainter.setWaypoints(waypoints);
//       Create a compound painter that uses both the route-painter and the waypoint-painter
    List<org.jxmapviewer.painter.Painter<org.jxmapviewer.JXMapViewer>> painters = new ArrayList<org.jxmapviewer.painter.Painter<org.jxmapviewer.JXMapViewer>>();
    painters.add(waypointPainter);
    CompoundPainter<org.jxmapviewer.JXMapViewer> painter = new CompoundPainter<org.jxmapviewer.JXMapViewer>(painters);
    frameWork.mapViewer.setOverlayPainter(painter);

}
public static void main (String args) {
    frame.setContentPane(frameWork.mainPanel);

    // Create a TileFactoryInfo for OpenStreetMap
    TileFactoryInfo info = new OSMTileFactoryInfo();
    DefaultTileFactory tileFactory = new DefaultTileFactory(info);
    frameWork.mapViewer.setTileFactory(tileFactory);

    // Set the Default Location
   GeoPosition chemnitz = new GeoPosition(50.833333, 12.916667);

    //Set the focus
    frameWork.mapViewer.setZoom(1);
    frameWork.mapViewer.setAddressLocation(chemnitz);

    // Add interactions
    MouseInputListener mia = new PanMouseInputListener(frameWork.mapViewer);

    frameWork.mapViewer.addMouseListener(mia);
    frameWork.mapViewer.addMouseMotionListener(mia);
    frameWork.mapViewer.addMouseListener(new CenterMapListener(frameWork.mapViewer));
    frameWork.mapViewer.addMouseWheelListener(new ZoomMouseWheelListenerCenter(frameWork.mapViewer));
    frameWork.mapViewer.addKeyListener(new   PanKeyListener(frameWork.mapViewer));

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //frame.pack();
    frame.setSize(900, 600);
    frame.setVisible(true);


}
}

Answer 1

如果没有完整的源代码，我只能假设问题可能出在1-你用来存储WayPoints的模型中:确保新的单击点被添加到模型中，而不是被最后一个所覆盖(检查所选WayPoints的大小)或2-你正在使用的视图为每个添加事件完全重新绘制；导致最后绘制的元素之前的所有丢失。