Examples with GeoJson ol.format.GeoJson used on opensource projects

Example 1 with GeoJson

use of ol.format.GeoJson in project gwt-ol3 by TDesjardins.

the class GeoJsonExample method show.

/* (non-Javadoc)
     * @see de.desjardins.ol3.demo.client.example.Example#show() */
@Override
public void show(String exampleId) {
    // create linestring
    Coordinate coordinate1 = new Coordinate(4e6, 2e6);
    Coordinate coordinate2 = new Coordinate(8e6, -2e6);
    Coordinate[] coordinates = { coordinate1, coordinate2 };
    LineString lineString = new LineString(coordinates);
    // create feature
    FeatureOptions featureOptions = new FeatureOptions();
    featureOptions.setGeometry(lineString);
    Feature feature = new Feature(featureOptions);
    // convert feature to GeoJSON
    GeoJson geoJsonFormat = new GeoJson();
    java.lang.Object geoJson = geoJsonFormat.writeFeatureObject(feature, null);
    // convert features from GeoJSON
    Feature featureGeoJson = geoJsonFormat.readFeature(geoJson, null);
    // show converted features
    Collection<Feature> lstFeatures = new Collection<Feature>();
    lstFeatures.push(featureGeoJson);
    VectorOptions vectorSourceOptions = new VectorOptions();
    vectorSourceOptions.setFeatures(lstFeatures);
    Vector vectorSource = new Vector(vectorSourceOptions);
    VectorLayerOptions vectorLayerOptions = new VectorLayerOptions();
    vectorLayerOptions.setSource(vectorSource);
    ol.layer.Vector vectorLayer = new ol.layer.Vector(vectorLayerOptions);
    // create a OSM-layer
    XyzOptions osmSourceOptions = new XyzOptions();
    Osm osmSource = new Osm(osmSourceOptions);
    LayerOptions osmLayerOptions = new LayerOptions();
    osmLayerOptions.setSource(osmSource);
    Tile osmLayer = new Tile(osmLayerOptions);
    // create a view
    View view = new View();
    Coordinate centerCoordinate = new Coordinate(0, 0);
    view.setCenter(centerCoordinate);
    view.setZoom(2);
    // create the map
    MapOptions mapOptions = new MapOptions();
    mapOptions.setTarget(exampleId);
    mapOptions.setView(view);
    Collection<Base> lstLayer = new Collection<Base>();
    lstLayer.push(osmLayer);
    lstLayer.push(vectorLayer);
    mapOptions.setLayers(lstLayer);
    Map map = new Map(mapOptions);
    // add some controls
    map.addControl(new ScaleLine());
    DemoUtils.addDefaultControls(map.getControls());
    // add some interactions
    map.addInteraction(new KeyboardPan());
    map.addInteraction(new KeyboardZoom());
    map.addControl(new Rotate());
}

Example 2 with GeoJson

use of ol.format.GeoJson in project gwt-ol3 by TDesjardins.

the class WfsExample method show.

/* (non-Javadoc)
     * @see de.desjardins.ol3.demo.client.example.Example#show()
     */
@Override
public void show(String exampleId) {
    // create a vector layer
    Vector vectorSource = new Vector();
    VectorLayerOptions vectorLayerOptions = new VectorLayerOptions();
    vectorLayerOptions.setSource(vectorSource);
    ol.layer.Vector wfsLayer = new ol.layer.Vector(vectorLayerOptions);
    // create a view
    View view = new View();
    Coordinate centerCoordinate = new Coordinate(-8908887.277395891, 5381918.072437216);
    view.setCenter(centerCoordinate);
    view.setZoom(12);
    view.setMaxZoom(19);
    // create the map
    MapOptions mapOptions = OLFactory.createOptions();
    mapOptions.setTarget(exampleId);
    mapOptions.setView(view);
    Map map = new Map(mapOptions);
    map.addLayer(DemoUtils.createOsmLayer());
    map.addLayer(wfsLayer);
    Wfs wfs = new Wfs();
    WfsWriteFeatureOptions wfsWriteFeatureOptions = new WfsWriteFeatureOptions();
    String[] featureTypes = { "water_areas" };
    wfsWriteFeatureOptions.setSrsName("EPSG:3857");
    wfsWriteFeatureOptions.setFeaturePrefix("osm");
    wfsWriteFeatureOptions.setFeatureNS("http://openstreemap.org");
    wfsWriteFeatureOptions.setFeatureTypes(featureTypes);
    // set a filter
    wfsWriteFeatureOptions.setFilter(new IsLike("name", "Mississippi*"));
    wfsWriteFeatureOptions.setOutputFormat("application/json");
    // create WFS-XML node
    Node wfsNode = wfs.writeGetFeature(wfsWriteFeatureOptions);
    RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, "https://ahocevar.com/geoserver/wfs");
    requestBuilder.setRequestData(new XMLSerializer().serializeToString(wfsNode));
    requestBuilder.setCallback(new RequestCallback() {

        @Override
        public void onResponseReceived(com.google.gwt.http.client.Request request, Response response) {
            GeoJson geoJson = new GeoJson();
            Feature[] features = geoJson.readFeatures(response.getText());
            vectorSource.addFeatures(features);
            map.getView().fit(vectorSource.getExtent());
        }

        @Override
        public void onError(com.google.gwt.http.client.Request request, Throwable exception) {
            Window.alert(exception.getMessage());
        }
    });
    try {
        requestBuilder.send();
    } catch (RequestException e) {
        Window.alert(e.getMessage());
    }
}