【20091023-01】透析ArcGIS Engine三维动画轨迹的处理方法（转）

转自：http://hi.baidu.com/ych1219553/blog/item/a4efbb245ce69c034d088d06.html#send

 

关于ArcGIS的三维解决方案，用过ArcScene的朋友，应该是深有体会的了。。。当然我们也看到很多朋友在网上发布了很多三维处理效果图，真是让人兴奋不已呀。。。在这里我也把自己的所做的一些基于ArcGIS Engine的三维场景的动画轨迹的录制解决方法，跟大家共享！希望我的心血能为大家提供一点帮助！

在ArcGIS的接口里，提供了IAnimationTracks，通过它我们可以实现三维动画轨迹的创建，删除或在播放当前轨迹的三维场景效果，进而可以生成三维场景的录像输出处理方法（这个我在下一篇再给大家介绍），还是看看具体实现代码吧－－

   /// <summary>   /// 创建动画轨迹   /// </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>   /// 删除动画轨迹   /// </summary>   public void RemoveAnimationTrack( string trackName )   {          IAnimationTrack pAnimationTrack;          pAnimationTracks.FindTrack( trackName, out pAnimationTrack );          pAnimationTracks.RemoveTrack( pAnimationTrack );   }   /// <summary>   /// 播放当前动画轨迹   /// </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];          }   }

是不是很简单呢？记住哟，在播放轨迹的时候，有个时间的处理方法，具体在程序调试时，多试几次就知道是怎么回事了，我就不多说了。。。

当然，还有动画帧的处理方法，ArcGIS也提供了一个很方便的接口IKeyframe来实现的，再通过动画轨迹接口IAnimationTrack来实现动画帧的创建，删除等功能，代码实现如下：

   /// <summary>   /// 创建动画帧   /// </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>   /// 删除动画帧   /// </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>   /// 删除当前轨迹的所有帧   /// </summary>   public void RemoveAllKeyFrame( IAnimationTrack pAnimationTrack )   {         pAnimationTrack.RemoveAllKeyframes();     }

不知道大家对这些实现方法了解得多少？多多提意见哟。。。

 

 

转载于:https://www.cnblogs.com/willwayer/archive/2009/10/23/1588419.html

相关资源：ArcGIS Engine开发实例教程