二、WorldWindJavaApplet

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我做的项目是在网页中嵌入基于WorldWind的三维地球，所以呢，代码基本是由Java Applet为基准进行编写
本章就开始我们的第一个WorldWind Java Applet

一、新建Java项目WWJMFS
在src文件夹中新建包esi.oceanPlatform，在包中新建Class文件WWJMFS.java。
在WorldWindJava源码中，我们在包gov.nasa.worldwindx.examples.applet中可以看到NASA提供的两个Applet示例，我们鉴于此构建我们的Applet。
详细代码如下：

package esi.oceanPlatform;import java.awt.BorderLayout;import java.awt.Cursor;import java.awt.Panel;import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.util.ArrayList;import esi.control.FlatWorldPanel;import esi.control.MeasureToolPanel;import gov.nasa.worldwind.Configuration;import gov.nasa.worldwind.Model;import gov.nasa.worldwind.WorldWind;import gov.nasa.worldwind.WorldWindow;import gov.nasa.worldwind.avlist.AVKey;import gov.nasa.worldwind.awt.WorldWindowGLCanvas;import gov.nasa.worldwind.geom.Angle;import gov.nasa.worldwind.geom.LatLon;import gov.nasa.worldwind.geom.Position;import gov.nasa.worldwind.layers.Layer;import gov.nasa.worldwind.layers.LayerList;import gov.nasa.worldwind.layers.WorldMapLayer;import gov.nasa.worldwind.util.StatusBar;import gov.nasa.worldwind.util.measure.MeasureTool;import gov.nasa.worldwind.util.measure.MeasureToolController;import gov.nasa.worldwind.view.orbit.BasicOrbitView;import gov.nasa.worldwind.view.orbit.OrbitView;import gov.nasa.worldwindx.examples.ClickAndGoSelectListener;import gov.nasa.worldwindx.examples.util.LayerManagerLayer;import javax.swing.*;public class WWJMFS extends JApplet{    protected WorldWindowGLCanvas wwd;    private StatusBar statusBar;    private MeasureToolPanel measureToolPanel;    private PropertyChangeListener measureToolListener;    private MeasureTool measureToolObject;    private FlatWorldPanel flatWorldPanel;    public WWJMFS()    {    }    public void init(){        try        {            // Check for initial configuration values            String value = getParameter("InitialLatitude");            if (value != null)                Configuration.setValue(AVKey.INITIAL_LATITUDE, Double.parseDouble(value));            value = getParameter("InitialLongitude");            if (value != null)                Configuration.setValue(AVKey.INITIAL_LONGITUDE, Double.parseDouble(value));            value = getParameter("InitialAltitude");            if (value != null)                Configuration.setValue(AVKey.INITIAL_ALTITUDE, Double.parseDouble(value));            value = getParameter("InitialHeading");            if (value != null)                Configuration.setValue(AVKey.INITIAL_HEADING, Double.parseDouble(value));            value = getParameter("InitialPitch");            if (value != null)                Configuration.setValue(AVKey.INITIAL_PITCH, Double.parseDouble(value));            // Create World Window canvas.            this.wwd = new WorldWindowGLCanvas();            this.getContentPane().add(this.wwd, BorderLayout.CENTER);            // Create the default model as defined in the current worldwind configuration file.            Model m = (Model) WorldWind.createConfigurationComponent(AVKey.MODEL_CLASS_NAME);            this.wwd.setModel(m);            // Setup a select listener for the worldmap click-and-go feature            this.wwd.addSelectListener(new ClickAndGoSelectListener(this.wwd, WorldMapLayer.class));            //起始定位            try {                InitLocation(35.9501, 120.2133, 30000.0, 0.0, 0.0);            } catch (Exception e) {                System.out.println(e.toString());            }            Panel pageEndPanel=new Panel();            pageEndPanel.setLayout(new BoxLayout(pageEndPanel,BoxLayout.X_AXIS));            //Flat/Round World            flatWorldPanel=new FlatWorldPanel(wwd);            pageEndPanel.add(flatWorldPanel);            this.setFlatWorldVisible(isVisible());            //状态栏            this.wwd.setCursor(new Cursor(0x1));            this.statusBar=new StatusBar();            pageEndPanel.add(this.statusBar);            this.statusBar.setEventSource(wwd);            this.statusBar.setShowNetworkStatus(false);            //测量面板            measureToolObject=new MeasureTool(wwd);            measureToolObject.setController(new MeasureToolController());            measureToolPanel=new MeasureToolPanel(this.wwd, measureToolObject);            measureToolListener=new MeasureToolListener();            switchMeasureTool();            pageEndPanel.add(measureToolPanel);            this.setMeasureToolVisible(isVisible());            this.getContentPane().add(pageEndPanel, BorderLayout.PAGE_END);            LayerManagerLayer layerManagerLayer=new LayerManagerLayer(wwd);            layerManagerLayer.setName("图层控制");            layerManagerLayer.setEnabled(true);            m.getLayers().add(layerManagerLayer);        }        catch (Throwable e)        {            e.printStackTrace();        }    }    public void stop()    {        WorldWind.shutDown();    }    /**     * 插入图层位置     * */    public void insertBeforeLayerName(WorldWindow wwd, Layer layer, String targetName)    {        // Insert the layer into the layer list just before the target layer.        LayerList layers = wwd.getModel().getLayers();        int targetPosition = layers.size() - 1;        for (Layer l : layers)        {            if (l.getName().indexOf(targetName) != -1)            {                targetPosition = layers.indexOf(l);                break;            }        }        layers.add(targetPosition, layer);    }    /**     * 初始图层定位     */    public void InitLocation  ( Double Lat, Double Lon , Double zoom , Double heading , Double patch ){        Position position = new Position(Angle.fromDegrees(Lat), Angle.fromDegrees(Lon),zoom);        this.wwd.getView().setEyePosition(position);        this.wwd.getView().setHeading(Angle.fromDegrees( heading));        this.wwd.getView().setPitch(Angle.fromDegrees(patch));        this.wwd.redraw();    }    /**     * 测量面板     * */    public class MeasureToolListener implements PropertyChangeListener{        public void propertyChange(PropertyChangeEvent event){            if(event.getPropertyName().equals(MeasureTool.EVENT_POSITION_ADD)||event.getPropertyName().equals(MeasureTool.EVENT_POSITION_REMOVE)||event.getPropertyName().equals(MeasureTool.EVENT_POSITION_REPLACE)){                updateProfile(((MeasureTool)event.getSource()));            }        }    }    private void updateProfile(MeasureTool mt){        ArrayList<? extends LatLon>positions=mt.getPositions();        if(positions!=null&&positions.size()>1){            }else{}        this.wwd.redraw();    }    private void switchMeasureTool(){        MeasureTool measureTool=measureToolPanel.getMeasureTool();        measureTool.addPropertyChangeListener(measureToolListener);        updateProfile(measureTool);    }    // ============== Public API - Javascript ======================= //    /**     * 指定经纬度、视野范围、方向定位     */    public void gotoLatLon(double lat, double lon, double zoom)    {        this.gotoLatLon(lat, lon, zoom, 0.0, 60.0);    }    public void gotoLatLon(double lat, double lon, double zoom, double heading, double pitch)    {        BasicOrbitView view = (BasicOrbitView) wwd.getView();        if (!Double.isNaN(lat) || !Double.isNaN(lon) || !Double.isNaN(zoom))        {            lat = Double.isNaN(lat) ? view.getCenterPosition().getLatitude().degrees : lat;            lon = Double.isNaN(lon) ? view.getCenterPosition().getLongitude().degrees : lon;            zoom = Double.isNaN(zoom) ? view.getZoom() : zoom;            heading = Double.isNaN(heading) ? view.getHeading().degrees : heading;            pitch = Double.isNaN(pitch) ? view.getPitch().degrees : pitch;            view.addPanToAnimator(Position.fromDegrees(lat, lon, 0),                Angle.fromDegrees(heading), Angle.fromDegrees(pitch), zoom, true);        }    }    /**     * 设置视野范围     */    public void setHeadingAndPitch(double heading, double pitch)    {        BasicOrbitView view = (BasicOrbitView) wwd.getView();        if (!Double.isNaN(heading) || !Double.isNaN(pitch))        {            heading = Double.isNaN(heading) ? view.getHeading().degrees : heading;            pitch = Double.isNaN(pitch) ? view.getPitch().degrees : pitch;            view.addHeadingPitchAnimator(                view.getHeading(), Angle.fromDegrees(heading), view.getPitch(), Angle.fromDegrees(pitch));        }    }    public void setZoom(double zoom)    {        BasicOrbitView view = (BasicOrbitView) wwd.getView();        if (!Double.isNaN(zoom))        {            view.addZoomAnimator(view.getZoom(), zoom);        }    }    /**     * Get the WorldWindowGLCanvas     */    public WorldWindowGLCanvas getWW()    {        return wwd;    }    /**     * Get the current OrbitView     */    public OrbitView getOrbitView()    {        if (this.wwd.getView() instanceof OrbitView)            return (OrbitView) this.wwd.getView();        return null;    }    /**     * Get a reference to a layer with part of its name     */    public Layer getLayerByName(String layerName)    {        for (Layer layer : this.wwd.getModel().getLayers())        {            if (layer.getName().indexOf(layerName) != -1)                return layer;        }        return null;    }    /**     * 显示/隐藏测量面板     */    public void setMeasureToolVisible ( boolean isVisible){        this.measureToolPanel.setVisible(isVisible);    }    public void setFlatWorldVisible(boolean isVisible) {        this.flatWorldPanel.setVisible(isVisible);    }}

因为我的主要任务是在网页中嵌入三维地球，所以我把上述代码大致分为两块。以
// ============== Public API - Javascript ======================= //
分割
分割线以上部分为球体正常运行所需代码，分割线以下主要去写一些在网页中，通过JavaScript调用函数的接口。
上述代码中仅是比NASA提供的Applet实例多了两个功能，
一个是初始图层定位问题，另一个是测量面板的加载问题，这方面比较简单，就不在进行详解。

二、运行WWJMFS.java可以得到如下图所示
这里写图片描述

三、本实例中，图层控制面板（左下角）的选择
图层控制面板可以控制各图层的打开关闭，代码如下：

LayerManagerLayer layerManagerLayer=new LayerManagerLayer(wwd);            layerManagerLayer.setName("图层控制");            layerManagerLayer.setEnabled(true);            m.getLayers().add(layerManagerLayer);

得到如下图这样这里写图片描述
我们看到图中所列这些，可以在WorldWindJava项目中进行更改。
选择src->config->worldwind.layers.xml文件
更改该xml文件如下：

<?xml version="1.0" encoding="UTF-8"?><!--  ~ Copyright (C) 2012 United States Government as represented by the Administrator of the  ~ National Aeronautics and Space Administration.  ~ All Rights Reserved.  --><!--$Id: worldwind.layers.xml 1382 2013-05-31 00:37:46Z tgaskins $--><!--This document specifies the initial layers to load in World Wind--><!--This list can be overridden by specifying an alternate list in worldwind.xml, or by specifying an--><!--alternate configuration document--><!--See the javadoc for the Configuration class for details--><LayerList>    <!-- 星空 -->    <Layer className="gov.nasa.worldwind.layers.StarsLayer">        <!--Individual properties can be specified within Layer entries, like this:-->        <Property name="Name" value="星空"/>    </Layer>    <!-- 大气层 -->    <Layer className="gov.nasa.worldwind.layers.SkyGradientLayer">        <Property name="Name" value="大气层"/>    </Layer>    <!-- 默认影像 -->    <!-- <Layer className="gov.nasa.worldwind.layers.Earth.BMNGOneImage">        <Property name="Name" value="NASAIMAGE"/>        <Property name="MinActiveAltitude" value="3e5"/>    </Layer> -->    <!-- 自定义影像 -->    <Layer href="config/Earth/CustomImage.xml" actuate="onLoad">        <Property name="Name" value="Images"></Property>    </Layer>    <!-- 影像 -->    <!-- <Layer href="config/Earth/BMNGWMSLayer2.xml" actuate="onLoad"/>    <Layer href="config/Earth/LandsatI3WMSLayer2.xml" actuate="onLoad"/>    <Layer href="config/Earth/USDANAIPWMSImageLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/USDANAIPUSGSWMSImageLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/MSVirtualEarthAerialLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/BingImagery.xml" actuate="onRequest"/>    <Layer href="config/Earth/USGSTopoLowResLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/USGSTopoMedResLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/USGSTopoHighResLayer.xml" actuate="onRequest"/>    <Layer href="config/Earth/USGSUrbanAreaOrthoLayer.xml" actuate="onRequest"/> -->    <!--<Layer className="gov.nasa.worldwind.layers.Earth.OSMMapnikLayer" actuate="onRequest"/>-->    <!--<Layer className="gov.nasa.worldwind.layers.Earth.OSMCycleMapLayer" actuate="onRequest"/>-->    <!-- 官方边界 -->    <!-- <Layer className="gov.nasa.worldwind.layers.Earth.CountryBoundariesLayer" actuate="onRequest"/>-->    <!-- 街道地图 -->    <!-- <Layer href="config/Earth/OpenStreetMap.xml" actuate="onRequest"/> -->    <!-- 夜景 -->    <!-- <Layer href="config/Earth/EarthAtNightLayer.xml" actuate="onRequest"/> -->    <!-- 地名 -->    <!-- <Layer className="gov.nasa.worldwind.layers.Earth.NASAWFSPlaceNameLayer"/> -->    <!-- 小地图 -->    <Layer className="gov.nasa.worldwind.layers.WorldMapLayer">        <Property name="Name" value="小地图"/>    </Layer>    <!-- 比例尺 -->    <Layer className="gov.nasa.worldwind.layers.ScalebarLayer">        <Property name="Name" value="比例尺"/>    </Layer>    <!-- 指北针 -->    <Layer className="gov.nasa.worldwind.layers.CompassLayer">        <Property name="Name" value="指北针"/>    </Layer></LayerList>

红色字体为注释掉的部分。
其中自定义影像部分以后在进行总结。

本章就到此结束。

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