[Gwt-openlayers-users] Markers in OpenStreetMap

[Hans T. M. <han...@ho...>]

Hi.

I'm having some difficulties with displaying markers when using the OSM 
class as the base layer.
When using a WMS layer it displays correctly, but when I change to OSM 
it don't get the coordinates
and are then displayed at the center of the map. Can someone explain this?

*Sample code from my project:*

public class Tutorial1 implements EntryPoint {

     private MapOptions mapOptions;
     private MapWidget mapWidget;
     private Map map;
     private OSM osmLayer;
     private Markers markers;
     private Marker marker;
     private LonLat center;
     private LonLat markerPosition;
     private Size size;
     private Icon icon;
     private DockPanel dockPanel;

     public void onModuleLoad() {
         mapOptions = new MapOptions();
         mapOptions.setControls(new JObjectArray(new JSObject[] {}));
         mapOptions.setProjection("EPSG:900913");
         mapOptions.setDisplayProjection(new Projection("EPSG:4326"));
         mapOptions.setMaxExtent(new
         Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34));
         mapOptions.setNumZoomLevels(19);
         mapOptions.setUnits("m");

         mapWidget = new MapWidget("1000px", "500px", mapOptions);
         map = mapWidget.getMap();
         map.addControl(new PanZoomBar());
         map.addControl(new MousePosition());
         map.addControl(new MouseToolbar());
         map.addControl(new LayerSwitcher());

         center = new LonLat(0, 0);
         map.setCenter(center, 3);

         osmLayer = OSM.Mapnik("OpenStreetMap");

         markers = new Markers("marker layer");

         map.addLayers(new Layer[] {osmLayer, markers});

         markerPosition = new LonLat(-73.99112, 40.77060);

         size = new Size(10,17);
         icon = new Icon("img/marker.png", size);
         marker = new Marker(markerPosition, icon);
         markers.addMarker(marker);

         dockPanel = new DockPanel();
         dockPanel.add(mapWidget, DockPanel.CENTER);
         dockPanel.setBorderWidth(1);
         RootPanel.get("map").add(dockPanel);
     }
}

Cheers,
Hans