带有OpenStreetMap示例的GWT-Openlayers
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21-09-2019 - |
题
我想将OSM集成到GWT中。我找到了这个称为GWT-Openlayers的库,但是我不明白如何使其与OSM地图一起使用。
谁能为我提供一个简短的例子?
解决方案
确保通过将以下内容添加到模块文件中,从GWT-Openlayers继承:
<inherits name='org.gwtopenmaps.openlayers.OpenLayers'/>
另外,请确保通过在“ application.html”页面中添加以下行:
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
<script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js"></script>
然后,创建使用开放式街道地图的图层应该很简单:
OSM openStreetMap = OSM.Osmarender("Base Map");
openStreetMap.setIsBaseLayer(true);
MapWidget mapWidget = new MapWidget("350px", "350px");
mapWidget.getMap().addLayer(openStreetMap);
其他提示
GWT-OpenlayersHelloWorld
使用OpenStreetMap
以下示例对我来说很好OpenLayers-2.8/OpenLayers.js
和OpenStreetMap.js
如上所述:
public void 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); }
您可以在此处找到GWT-Openlayers的当前版本: http://sourceforge.net/projects/gwt-openlayers/