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.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.Timer; 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.GEMapType; 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.KmlLookAt; import com.nitrous.gwt.earth.client.api.KmlPlacemark; import com.nitrous.gwt.earth.client.api.KmlPoint; /** * A GWT implementation of the demo found <a href="http://code.google.com/apis/ajax/playground/#sky_mode">here</a>. * * @author nick * */ public class SkyModeDemo 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 skyButton = new Button("Switch to Sky"); skyButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { showSky(); } }); Button earthButton = new Button("Switch to Earth"); earthButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { showEarth(); } }); HorizontalPanel topPanel = new HorizontalPanel(); topPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER); topPanel.add(skyButton); topPanel.add(earthButton); DockLayoutPanel layout = new DockLayoutPanel(Unit.PX); layout.addNorth(topPanel, 30D); layout.add(earth); RootLayoutPanel.get().add(layout); // begin loading the Google Earth Plug-in earth.init(); } /** * 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); } private void showSky() { final GEPlugin ge = earth.getGEPlugin(); ge.getOptions().setMapType(GEMapType.MAP_TYPE_SKY); // Start the zoom-in after one second. new Timer() { @Override public void run() { // Zoom in on a nebula. double oldFlyToSpeed = ge.getOptions().getFlyToSpeed(); ge.getOptions().setFlyToSpeed(.2); // Slow down the camera flyTo speed. KmlLookAt lookAt = ge.getView().copyAsLookAt(KmlAltitudeMode.ALTITUDE_RELATIVE_TO_GROUND); lookAt.set(41.28509187215, -169.2448684551622, 0, KmlAltitudeMode.ALTITUDE_RELATIVE_TO_GROUND, 262.87, 0, 162401); // Also try: // lookAt.set(-59.65189337195337, -18.799770300376053, 0, KmlAltitudeMode.ALTITUDE_RELATIVE_TO_GROUND, 0, 0, 36817); ge.getView().setAbstractView(lookAt); ge.getOptions().setFlyToSpeed(oldFlyToSpeed); } }.schedule(1000); } private void showEarth() { GEPlugin ge = earth.getGEPlugin(); ge.getOptions().setMapType(GEMapType.MAP_TYPE_EARTH); } }