GlobeControl中如何实现动画效果？

public void CreateAnimationFromKeyframes(ESRI.ArcGIS.GlobeCore.IGlobe globe) 

{ 

// get Globe Camera in the globe display 

ESRI.ArcGIS.GlobeCore.IGlobeDisplay globeDisplay = globe.GlobeDisplay; 



ESRI.ArcGIS.Analyst3D.ISceneViewer sceneViewer = globeDisplay.ActiveViewer; 

ESRI.ArcGIS.Analyst3D.ICamera camera = sceneViewer.Camera; 

ESRI.ArcGIS.GlobeCore.IGlobeCamera globeCamera = (ESRI.ArcGIS.GlobeCore.IGlobeCamera)camera; // Explicit Cast 



// create keyframe 

ESRI.ArcGIS.Animation.IAGKeyframe agKeyframe = new ESRI.ArcGIS.GlobeCore.GlobeCameraKeyframeClass(); 



// set active properties 

ESRI.ArcGIS.esriSystem.ILongArray longArray = new ESRI.ArcGIS.esriSystem.LongArrayClass(); 

longArray.Add(4); // Observer Lat. 

longArray.Add(5); // Observer Lon. 

longArray.Add(6); // Observer Alt. 

agKeyframe.ActiveProperties = longArray; 



ESRI.ArcGIS.Animation.IAGAnimationType agAnimationType = new ESRI.ArcGIS.GlobeCore.AnimationTypeGlobeCameraClass(); 

ESRI.ArcGIS.Animation.IAGAnimationTrack agAnimationTrack = new ESRI.ArcGIS.Animation.AGAnimationTrackClass(); 

agAnimationTrack.AnimationType = agAnimationType; 

ESRI.ArcGIS.Animation.IAGAnimationContainer AGAnimationContainer = (ESRI.ArcGIS.Animation.IAGAnimationContainer)globe; // Explicit Cast 



// animation loop 

//模拟球体水平旋转动画效果

System.Double longitude; 

for (longitude = startLong; longitude <= endLong ; longitude++) 

{ 

agKeyframe.set_PropertyValue(4, 0.0); // set latitude 

agKeyframe.set_PropertyValue(5, longitude); // set longitude 

agKeyframe.set_PropertyValue(6, 20000.0); // set altitude 

agKeyframe.Apply(agAnimationTrack, AGAnimationContainer, globeCamera); // apply it 

}



//模拟放大/缩小动画效果

System.Double altitude; 

for (altitude = startAlt; altitude >= endAlt; altitude--) 

{ 

agKeyframe.set_PropertyValue(4, 0.0); // set latitude 

agKeyframe.set_PropertyValue(5, longitude); // set longitude 

agKeyframe.set_PropertyValue(6, altitude); // set altitude 

agKeyframe.Apply(agAnimationTrack, AGAnimationContainer, globeCamera); // apply it 

} 



globeDisplay.RefreshViewers(); 

}