Java tutorial
/* * Copyright 2012 Nick Kerr * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.nitrous.gwt.earth.client.demo; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.DockLayoutPanel; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.RootLayoutPanel; import com.nitrous.gwt.earth.client.api.GELayerId; import com.nitrous.gwt.earth.client.api.GEPlugin; import com.nitrous.gwt.earth.client.api.GEPluginReadyListener; import com.nitrous.gwt.earth.client.api.GEVisibility; import com.nitrous.gwt.earth.client.api.GoogleEarth; import com.nitrous.gwt.earth.client.api.GoogleEarthWidget; import com.nitrous.gwt.earth.client.api.KmlAltitudeMode; import com.nitrous.gwt.earth.client.api.KmlIcon; import com.nitrous.gwt.earth.client.api.KmlLookAt; import com.nitrous.gwt.earth.client.api.KmlPlacemark; import com.nitrous.gwt.earth.client.api.KmlPoint; import com.nitrous.gwt.earth.client.api.KmlStyle; import com.nitrous.gwt.earth.client.api.KmlStyleMap; /** * A GWT implementation of the demo found <a href="http://code.google.com/apis/ajax/playground/#styling_placemarks_using_style_maps">here</a>. * * @author nick * */ public class PlacemarkStyleMapDemo implements EntryPoint { private GoogleEarthWidget earth; private KmlPlacemark placemark; public void onModuleLoad() { // Load the Earth API GoogleEarth.loadApi(new Runnable() { @Override public void run() { // start the application onApiLoaded(); } }); } /** * The Google earth API has loaded, start the application */ private void onApiLoaded() { // construct the UI widget earth = new GoogleEarthWidget(); // register a listener to be notified when the earth plug-in has loaded earth.addPluginReadyListener(new GEPluginReadyListener() { public void pluginReady(GEPlugin ge) { // show map content once the plugin has loaded loadMapContent(); } public void pluginInitFailure() { // failure! Window.alert("Failed to initialize Google Earth Plug-in"); } }); Button applyStyleButton = new Button("Give the Placemark a StyleMap!"); applyStyleButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { onButtonClick(); } }); } }); HorizontalPanel buttons = new HorizontalPanel(); buttons.add(applyStyleButton); HorizontalPanel topPanel = new HorizontalPanel(); topPanel.setWidth("100%"); topPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER); topPanel.add(buttons); DockLayoutPanel layout = new DockLayoutPanel(Unit.PX); layout.addNorth(topPanel, 40D); layout.add(earth); RootLayoutPanel.get().add(layout); // begin loading the Google Earth Plug-in earth.init(); } private void onButtonClick() { GEPlugin ge = earth.getGEPlugin(); KmlStyleMap styleMap = ge.createStyleMap(""); // Create normal style for style map KmlStyle normalStyle = ge.createStyle(""); KmlIcon normalIcon = ge.createIcon(""); normalIcon.setHref("http://maps.google.com/mapfiles/kml/shapes/triangle.png"); normalStyle.getIconStyle().setIcon(normalIcon); // Create highlight style for style map KmlStyle highlightStyle = ge.createStyle(""); KmlIcon highlightIcon = ge.createIcon(""); highlightIcon.setHref("http://maps.google.com/mapfiles/kml/shapes/square.png"); highlightStyle.getIconStyle().setIcon(highlightIcon); styleMap.setNormalStyle(normalStyle); styleMap.setHighlightStyle(highlightStyle); // Apply stylemap to a placemark placemark.setStyleSelector(styleMap); // for some reason the placemark does not repaint, so force a repaint here placemark.setVisibility(false); placemark.setVisibility(true); } /** * Display content on the map */ private void loadMapContent() { // The GEPlugin is the core class and is a great place to start browsing // the API GEPlugin ge = earth.getGEPlugin(); ge.getWindow().setVisibility(true); // add a navigation control ge.getNavigationControl().setVisibility(GEVisibility.VISIBILITY_AUTO); // add some layers ge.enableLayer(GELayerId.LAYER_BORDERS, true); ge.enableLayer(GELayerId.LAYER_ROADS, true); // create the placemark placemark = ge.createPlacemark(""); KmlPoint point = ge.createPoint(""); point.setLatitude(37); point.setLongitude(-122); placemark.setGeometry(point); // add the placemark to the earth DOM ge.getFeatures().appendChild(placemark); // look at the placemark we created KmlLookAt la = ge.createLookAt(""); la.set(37, -122, 0, // altitude KmlAltitudeMode.ALTITUDE_RELATIVE_TO_GROUND, 0, // heading 0, // straight-down tilt 5000 // range (inverse of zoom) ); ge.getView().setAbstractView(la); } }