ArcGlobe三维开发之十四————播放动画

╰半夏微凉° 2022-08-26 12:24 223阅读 0赞

在动画开发中，录制的一个动画可能只有一个Track也可能有多个Track。前面的博文提到动画的实现方式有两种，这里采用基于Camera的动画。这里我做的比较简单，首先来看实现效果图：

![SouthEast][]

下面，我们来看，如何在Globe下实现动画的播放。来看下面的OMD图，从这张图里我们可以看出，Globe包含多个Track（轨迹），Track包含多个KeyFrame（关键帧）；动画类型主要有基于Camera的和基于Layer，再有就是前面提到的基于关键帧的三种类型。那么具体如何做呢？我们一步一步来看：

![985aa7e0-d123-4435-b88e-17e422fabb7e3.png][]

（1）AnimationExtension

The  [AnimationExtension][]  object is the access point for other animation objects in ArcMap, Scene, and Globe.  **Typically, when you work with animation objects, the AnimationExtension object needs to be obtained as the first step before other actions are performed.** The animation environment and animation track container objects can be accessed through the  [IAnimationExtension][]  interface.

之前的博文提到了   [IAnimationExtension][]  接口，这个地方说在操作动画对象前必须要首先获得AnimationExtension对象，通过该对象获得动画参数设置对象和动画轨迹容器对象。接口如下图所示：

![SouthEast 1][]

![SouthEast 2][]

代码如下：

IGlobe globe = globecontrol.Globe;
                IBasicScene2 basicscene = globe as IBasicScene2;
                IAnimationExtension animationEx = basicscene.AnimationExtension;
                agAnimationEnv = animationEx.AnimationEnvironment;

（2）获取AGAnimationEnvironment 对象后就可以设置播放的参数，比如播放模式，持续时间等参数 ![SouthEast 3][]  
代码如下：

//设置动画播放参数
            private void SetAnimationEnv ()
            {
                //获取AGAnimationEnvironment对象
                IGlobe globe = globecontrol.Globe;
                IBasicScene2 basicscene = globe as IBasicScene2;
                IAnimationExtension animationEx = basicscene.AnimationExtension;
                agAnimationEnv = animationEx.AnimationEnvironment;
                
                agAnimationEnv.AnimationDuration = Convert.ToDouble(textBox_AnimationDuration.Text);//持续时间
                agAnimationEnv.PlayType=esriAnimationPlayType.esriAnimationPlayTypeDuration; //播放模式
                Set_Animation_PlayMode();
                agAnimationEnv.PlayMode = animationPlayMode;
            }
    
            //设置播放模式
            private void Set_Animation_PlayMode ()
            {
                switch (comboBox_PlayMode.Text)
                {
                    case "正向播放一次":
                    animationPlayMode = esriAnimationPlayMode.esriAnimationPlayOnceForward;
                	break;
                    case "反向播放一次":
                    animationPlayMode = esriAnimationPlayMode.esriAnimationPlayOnceReverse;
                    break;
                    case "正向循环":
                    animationPlayMode = esriAnimationPlayMode.esriAnimationPlayLoopForward;
                    break;
                    case "正反循环":
                    animationPlayMode = esriAnimationPlayMode.esriAnimationPlayLoopReverse;
                    break;
                    default:
                    break;
                }
                
            }

（3）设置完播放参数，下一步就应该是播放了，动画的播放主要用到IAGAnimationPlayer 接口，通过该接口可以播放，暂停，停止和录制动画。如下图所示：

![SouthEast 4][]

代码如下：

IAGAnimationPlayer agAnimationPlayer new AGAnimationEnvironmentClass();

agAnimationPlayer.PlayAnimation(agAnimationTracks,agAnimationEnv,null);

（4）PlayAnimation方法需要三个参数：

[C#]public void PlayAnimation (
        IAGAnimationTrackspTracks,
        IAGAnimationEnvironmentpEnvironment,
        IStatusBarpStatusBar);

第一个参数是Tracks，就是动画所包含的轨迹，这里动画可能包含多条轨迹，如果要播放其中的一条指定轨迹则需要对轨迹进行处理：

//选中播放轨迹可见，其余不可见
            private void enableSelectedTrack ()
            {
                string selectedTrackName = agAnimationTrack.Name;
                IArray tracksArray = agAnimationTracks.AGTracks;
                int trackCount = tracksArray.Count;
                if (trackCount>0)
                {
                    for(int i = 0;i < trackCount;i++)
                    {
                        IAGAnimationTrack track_temp = tracksArray.get_Element(i) as IAGAnimationTrack;
                        if(track_temp.Name==selectedTrackName)
                        {
                            track_temp.IsEnabled = true;
                            
                        }
                        else if (track_temp.Name!=selectedTrackName)
                        {
                            IAGAnimationTrack track2Disabled;
                            agAnimationTracks.FindTrack(track_temp.Name,out track2Disabled);
                            track2Disabled.IsEnabled = false;
                        }
                        
                    }
                
                }
    
    
            }

通过以上步骤就可以实现对动画的操作，至此，ArcGlobe组件开发之动画篇就结束了，希望对需要的童鞋有所帮助。

[SouthEast]: /images/20220824/200192210cf54b409f27c164dc3673e4.png
[985aa7e0-d123-4435-b88e-17e422fabb7e3.png]: http://127.0.0.1:47873/help/1-5532/ms.help?content/ESRI/store/esriAnimation.mshc;/html/bitmaps/985aa7e0-d123-4435-b88e-17e422fabb7e3.png
[AnimationExtension]: http://127.0.0.1:47873/help/1-5532/?method=f1&query=ESRI.ArcGIS.Animation.AnimationExtension&format=html&product=VS&productVersion=100&locale=en-us
[IAnimationExtension]: http://127.0.0.1:47873/help/1-5532/?method=f1&query=ESRI.ArcGIS.Animation.IAnimationExtension&format=html&product=VS&productVersion=100&locale=en-us
[SouthEast 1]: /images/20220824/28ad9e069f3e48c68a70535068f31f9a.png
[SouthEast 2]: /images/20220824/e2acc2b915c542c096518db4f746f95c.png
[SouthEast 3]: /images/20220824/6bf5e1f799124eed8da6af9c33e57b0d.png
[SouthEast 4]: /images/20220824/f7535a4c004148a6bab37d2cc1d72e1d.png