三、三维模型添加

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本章介绍WorldWindJava中加载三维模型

一、首先我们看WorldWindJava中给出的实例。
打开test->gov.nasa.worldwind.ogc.collada，可以看到有三个class文件。仔细分析ColladaViewer.java和ColladaMovingModel.java文件。
二、加载自己的三维模型
在包esi.control中新建class文件ColladaViewUtil.java文件，编写代码如下

package esi.control;import javax.swing.SwingUtilities;import gov.nasa.worldwind.WorldWind;import gov.nasa.worldwind.WorldWindow;import gov.nasa.worldwind.geom.Angle;import gov.nasa.worldwind.geom.Position;import gov.nasa.worldwind.layers.RenderableLayer;import gov.nasa.worldwind.ogc.collada.ColladaRoot;import gov.nasa.worldwind.ogc.collada.impl.ColladaController;import esi.oceanPlatform.*;public class ColladaViewUtil extends WWJMFS{    public static class WorkerThread extends Thread{        private Object colladaSource;        private Position position;        private String colladaName;        private WorldWindow wwd;        public WorkerThread(Object colladaSource,Position position,String colladaName,WorldWindow wwd){            this.colladaSource=colladaSource;            this.position=position;            this.colladaName=colladaName;            this.wwd=wwd;        }        public void run(){            try {                ColladaRoot colladaRoot=ColladaRoot.createAndParse(this.colladaSource);                SwingUtilities.invokeLater(new Runnable() {                    public void run() {                        addColladaLayer(colladaRoot,colladaName,wwd);                    }                });            } catch (Exception e) {                e.printStackTrace();            }        }        protected void addColladaLayer(ColladaRoot colladaRoot,String colladaName, WorldWindow wwd)        {            // Create a ColladaController to adapt the ColladaRoot to the World Wind renderable interface.            colladaRoot.setPosition(this.position);            colladaRoot.setHeading(Angle.fromDegrees(-15));            colladaRoot.setAltitudeMode(WorldWind.RELATIVE_TO_GROUND);            ColladaController colladaController = new ColladaController(colladaRoot);            // Adds a new layer containing the ColladaRoot to the end of the WorldWindow's layer list.            RenderableLayer layer = new RenderableLayer();            layer.addRenderable(colladaController);            layer.setName(colladaName);            wwd.getModel().getLayers().add(layer);        }    }}

在WorldWindJava源码中，testData->collada中为一些collada模型，我们现在在三维地球中添加一个三维建筑（cu_macky/CU Macky.dae）,我们先把cu_macky文件夹复制到WWJMFS项目中。然后需要在WWJMFS.java中进行调用，代码如下：

new ColladaViewUtil.WorkerThread(new File("E:/ESI/WorkSpace/WWJMFS/testData/collada/cu_macky/CU Macky.dae"),Position.fromDegrees(35.9844, 120.2742,0),"三维建筑",wwd).start();

可以得到如图：
这里写图片描述

三、加载模型动画
在项目中，有时需要添加一个动态的模型，例如航拍过程的模拟，就需要一架飞机按照固定路线飞行，此节我们需要完成这个任务。首先，我们分析ColladaMovingModel.java文件，并在WWJMFS项目中创建ColladaMovingModelUtil.java，代码如下

package esi.control;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.Timer;import gov.nasa.worldwind.WorldWindow;import gov.nasa.worldwind.geom.Angle;import gov.nasa.worldwind.geom.Position;import gov.nasa.worldwind.ogc.collada.ColladaRoot;public class ColladaMovingModelUtil extends ColladaViewUtil{    public static class WorkerThread extends ColladaViewUtil.WorkerThread{        public WorkerThread(Object colladaSource, Position position,                String colladaName, WorldWindow wwd) {            super(colladaSource, position, colladaName, wwd);        }        private Timer timer1;        private Timer timer2;        @Override        protected void addColladaLayer(ColladaRoot colladaRoot,String colladaName, WorldWindow wwd )        {            super.addColladaLayer(colladaRoot,colladaName,wwd);            // Rotate the duck to an upright position            colladaRoot.setPitch(Angle.fromDegrees(0));            int delay = 100; //milliseconds            timer1=new Timer(delay, new ActionListener()            {                public void actionPerformed(ActionEvent evt)                {                    double deltaAddDegrees = 0.0001;                    Position position = colladaRoot.getPosition();                    if("36.2844°".substring(0, 7).equals(position.latitude.toString().substring(0, 7))                            ||"120.5742°".substring(0, 7).equals(position.longitude.toString().substring(0, 7))){                        timer1.stop();                        timer2.start();                    }else{                       position = position.add(Position.fromDegrees(deltaAddDegrees, deltaAddDegrees));                       colladaRoot.setHeading(Angle.fromDegrees(-100));                       colladaRoot.setPosition(position);                    }                }            });            timer2=new Timer(delay, new ActionListener()            {                public void actionPerformed(ActionEvent evt)                {                    double deltaSubDegrees=-0.0001;                    Position position = colladaRoot.getPosition();                    if("35.9526°".substring(0, 7).equals(position.latitude.toString().substring(0, 7))                            ||"120.2128°".substring(0, 7).equals(position.longitude.toString().substring(0, 7))){                        timer2.stop();                        timer1.start();                    }else{                       position = position.add(Position.fromDegrees(deltaSubDegrees, deltaSubDegrees));                       colladaRoot.setHeading(Angle.fromDegrees(80));                       colladaRoot.setPosition(position);                    }                }            });            timer1.start();        }    }}

同样在WWJMFS.java文件中调用该函数，代码，

new ColladaMovingModelUtil.WorkerThread("E:/ESI/WorkSpace/WWJMFS/testData/collada/model.dae", Position.fromDegrees(35.9526, 120.2128,500), "航拍", wwd).start();

其中model.dae模型为我在3D Warehouse 中下载，模型如下图
这里写图片描述

本章结束

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