小秋的家

在ArcGIS的接口里，提供了IAnimationTracks，通過它我們可以實現三維動畫軌跡的創建，刪除或在播放當前軌跡的三維場景效果，進而可以生成三維場景的錄像輸出處理方法（這個我在下一篇再給大家介紹），還是看看具體實現代碼吧－－

   /// <summary>
   /// 創建動畫軌跡
   /// </summary>
   public void CreateAnimationTrack( string trackName )
   {
          IAnimationTrack pAnimationTrack = new AnimationTrackClass();
          IAnimationType pAnimationType = new AnimationTypeCameraClass();
          pAnimationTrack.AnimationType = pAnimationType;

          pAnimationTrack.Name = trackName;
          pAnimationTrack.AttachObject( pSceneGraph.ActiveViewer.Camera );
          pAnimationTrack.ApplyToAllViewers = true;
          pAnimationTrack.EvenTimeStamps = false;

          pAnimationTracks.AddTrack( pAnimationTrack );
   }

   /// <summary>
   /// 刪除動畫軌跡
   /// </summary>
   public void RemoveAnimationTrack( string trackName )
   {
          IAnimationTrack pAnimationTrack;
          pAnimationTracks.FindTrack( trackName, out pAnimationTrack );
          pAnimationTracks.RemoveTrack( pAnimationTrack );
   }

   /// <summary>
   /// 播放當前動畫軌跡
   /// </summary>
   public void PlayAnimationTrack( string trackName )
   {
          Hashtable htKeyTime = null;

          bool[] TracksEnable = new Boolean[pAnimationTracks.TrackCount];
          IAnimationTrack pAnimationTrack;
          for( int index = 0; index < pAnimationTracks.TrackCount; index++ )
          {
                 pAnimationTrack = pAnimationTracks.Tracks.get_Element( index ) as IAnimationTrack;
                 TracksEnable[index] = pAnimationTrack.IsEnabled;
                 if( pAnimationTrack.Name == trackName )
                 {
                        pAnimationTrack.IsEnabled = true;
                        htKeyTime = ClsAnimationTracks.GetKeyTimeTable( pAnimationTrack.Name );
                 }
                 else
                        pAnimationTrack.IsEnabled = false;

          }

   
          int sumTime = 0;
          foreach( object obj in htKeyTime.Values )
          {
                 sumTime += Convert.ToInt32( obj );
          }

          double duration = (double)sumTime / 1000;

          TimeSpan timeSpan;
          double elapsedTime;

   
          DateTime startTime = DateTime.Now;
          int j = 0;
          do
          {
                 timeSpan = (DateTime.Now).Subtract(startTime);
                 elapsedTime = timeSpan.TotalSeconds;
                 if (elapsedTime > duration) elapsedTime = duration;
                 pAnimationTracks.ApplyTracks(pSceneGraph.ActiveViewer, elapsedTime, duration);
                 pSceneGraph.RefreshViewers();
                 j = j + 1;
         }

          for( int index = 0; index < pAnimationTracks.TrackCount; index++ )
          {
                 pAnimationTrack = pAnimationTracks.Tracks.get_Element( index ) as IAnimationTrack;
                 pAnimationTrack.IsEnabled = TracksEnable[index];
          }
   }

是不是很簡單呢？記住喲，在播放軌跡的時候，有個時間的處理方法，具體在程序調試時，多試幾次就知道是怎么回事了，我就不多說了。。。

當然，還有動畫幀的處理方法，ArcGIS也提供了一個很方便的接口IKeyframe來實現的，再通過動畫軌跡接口IAnimationTrack來實現動畫幀的創建，刪除等功能，代碼實現如下：

   /// <summary>
   /// 創建動畫幀
   /// </summary>
   public void CreateKeyFrame( IAnimationTrack pAnimationTrack, string keyName, int timeSpan )
   {
         IKeyframe pKeyframe = new Bookmark3DClass();
         pKeyframe.Name = keyName;
         pKeyframe.CaptureProperties( pScene, pSceneGraph.ActiveViewer.Camera );

         pAnimationTrack.InsertKeyframe( pKeyframe, pAnimationTrack.KeyframeCount );

         Hashtable htKeyTime = ClsAnimationTracks.GetKeyTimeTable( pAnimationTrack.Name );
         int sumTime = 0;
         foreach( object obj in htKeyTime.Values )
         {
               sumTime += Convert.ToInt32( obj );
          }

         double dblTime = 0;
         for( int index = 0; index < pAnimationTrack.KeyframeCount; index++ )
         {
               pKeyframe = pAnimationTrack.get_Keyframe( index );
               dblTime += Convert.ToDouble( htKeyTime[pKeyframe.Name] ) / sumTime;
               pKeyframe.TimeStamp = dblTime;
         }
   }

   /// <summary>
   /// 刪除動畫幀
   /// </summary>
   public void RemoveKeyFrame( IAnimationTrack pAnimationTrack, string keyName )
   {
         for( int index = 0; index < pAnimationTrack.KeyframeCount; index++ )
         {
               if( pAnimationTrack.get_Keyframe( index ).Name == keyName )
               {
                     pAnimationTrack.RemoveKeyframe( index );
                     break;
               }
         }   
   }

   /// <summary>
   /// 刪除當前軌跡的所有幀
   /// </summary>
   public void RemoveAllKeyFrame( IAnimationTrack pAnimationTrack )
   {
         pAnimationTrack.RemoveAllKeyframes();  
   }