2010-03-22 76 views

回答

11

務必從GWT-的OpenLayers繼承通過添加以下到您的模塊文件:

<inherits name='org.gwtopenmaps.openlayers.OpenLayers'/>

另外,還要確保你在的OpenLayers JavaScript庫和OpenStreetMap的的OpenLayers到通過添加下面的應用程序帶來

<script src="http://www.openlayers.org/api/OpenLayers.js"></script>

<script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js"></script>

:在 「Application.html」 頁面線

,那麼它應該一件簡單的事情,以創建一個使用開放街道地圖圖層:

OSM openStreetMap = OSM.Osmarender("Base Map"); openStreetMap.setIsBaseLayer(true);

MapWidget mapWidget = new MapWidget("350px", "350px"); mapWidget.getMap().addLayer(openStreetMap);

+0

有沒有的OpenLayers一個安全的CDN .js和OpenStreetMap.js? – 2017-12-15 21:41:42

11

GWT-的OpenLayers HelloWorld與OpenStreetMap的

的以下示例適用於我使用OpenLayers-2.8/OpenLayers.jsOpenStreetMap.js如上所述:

公共無效onModuleLoad(){

MapOptions defaultMapOptions = new MapOptions(); 
MapWidget mapWidget = new MapWidget("800px", "600px", defaultMapOptions); 

OSM osm_1 = OSM.Osmarender("Osmarender"); // Label for menu 'LayerSwitcher' 
    osm_1.setIsBaseLayer(true); 

OSM osm_2 = OSM.Mapnik("Mapnik"); // Label for menu 'LayerSwitcher' 
    osm_2.setIsBaseLayer(true); 

OSM osm_3 = OSM.CycleMap("CycleMap"); 
    osm_3.setIsBaseLayer(true); 

OSM osm_4 = OSM.Maplint("Maplint"); 
    osm_4.setIsBaseLayer(true); 

Map map = mapWidget.getMap(); 
    map.addLayer(osm_1); 
    map.addLayer(osm_2); 
    map.addLayer(osm_3); 
    map.addLayer(osm_4); 
    map.addControl(new LayerSwitcher()); 
    map.addControl(new MousePosition()); 

// map.setCenter(new LonLat(6.95, 50.94), 12);   // Warning: In the case of OSM-Layers the method 'setCenter()' uses Gauss-Krueger coordinates, 
                  //   thus we have to transform normal latitude/longitude values into this projection first: 
    LonLat lonLat = new LonLat(6.95, 50.94);    //   (6.95, 50.94) --> (773670.4, 6610687.2) 
      lonLat.transform("EPSG:4326", "EPSG:900913"); //   
    map.setCenter(lonLat, 12);        //   see http://docs.openlayers.org/library/spherical_mercator.html 

RootPanel.get().add(mapWidget); } 
+1

'defaultMapOptions'和'map.setCenter(lonLat,12);'部分似乎非常重要...... – Ich 2012-08-02 23:40:05