AE+C#控制Globe操作范围

在实际的Globe操作过程中，都希望能够控制当前场景的范围，即使是误操作超出了范围也能够快速的自动的回到初始的范围。以下代码根据图层的范围控制显示操作的范围，一旦超出图层的范围，根据重绘事件监听，将当前地图范围重置到初始化范围。

系统环境：Win7 64位旗舰版
GIS环境：ArcEngine 10 sp4
开发环境：VS 2012 SP1C#

1、在frmMain主窗体中声明IGlobeDisplayEvents_Event事件

privateIGlobeDisplayEvents_Eventm_pGlobeDisplayEvents = null;

2、在窗体初始化的时候，对m_pGlobeDisplayEvents也进行初始化

public frmMain()
{
InitializeComponent();

IGlobe pGlobe = globeCtrl3D.Globe;//globeCtrl3D为Globe控件
m_pGlobeDisplayEvents= pGlobe.GlobeDisplay asIGlobeDisplayEvents_Event;
m_pGlobeDisplayEvents.AfterDraw += newIGlobeDisplayEvents_AfterDrawEventHandler(m_pGlobeDisplayEvents_AfterDraw);

}

3、重写m_pGlobeDisplayEvents_AfterDraw事件

publicvoid m_pGlobeDisplayEvents_AfterDraw(ISceneViewer pViewer)
{
try
{
IGlobeCamera pGlobeCamera =globeCtrl3D.GlobeCamera;
double dObserverLatDD = 0.0;
double dObserverLonDD = 0.0;
double dObserverAltKMs = 0.0;

pGlobeCamera.GetObserverLatLonAlt(out dObserverLatDD, out dObserverLonDD, out dObserverAltKMs);

ILayer layer = Common.GlobeUtil.getLayerFromScene(globeCtrl3D.GlobeDisplay.Scene,"bj");//bj为要控制范围的图层，getLayerFromScene为在GlobeControl中获取相应图层的函数，这里不再赘述
IEnvelope pInitEnvelope =layer.AreaOfInterest;
double dXMin = pInitEnvelope.XMin;
double dXMax = pInitEnvelope.XMax;
double dYMin = pInitEnvelope.YMin;
double dYMax = pInitEnvelope.YMax;
// 以下判断当前操作是否在图层范围内，高度控制在0至20公里（可以根据实际情况设置，此时为地上模式；如果想要地下模式可以将其改为负数）
if ((dObserverLatDD < dYMin) || (dObserverLatDD> dYMax) || (dObserverLonDD < dXMin) || (dObserverLonDD > dXMax)
||(dObserverAltKMs > 20) || (dObserverAltKMs < 0))
{// 以下为获取初始化的操作范围，该范围设置在App.Config中
double dInitObserverLatDD = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["ObserverLatDD"]);
double dInitObserverLonDD = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["ObserverLonDD"]);
double dInitObserverAltKMs = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["ObserverAltKMs"]);
double dInitTargetLatDD = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["TargetLatDD"]);
double dInitTargetLonDD = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["TargetLonDD"]);
double dInitTargetAltKMs = Convert.ToDouble(System.Configuration.ConfigurationSettings.AppSettings["TargetAltKMs"]);

pGlobeCamera.SetObserverLatLonAlt(dInitObserverLatDD,dInitObserverLonDD, dInitObserverAltKMs);
pGlobeCamera.SetTargetLatLonAlt(dInitTargetLatDD, dInitTargetLonDD,dInitTargetAltKMs);
globeCtrl3D.GlobeDisplay.RefreshViewers();
}
}
catch (Exception ex)
{
string msg = ex.Message;
}
}

4、App.Config中的初始化参数为

<appSettings>
<!--初始化的位置-->
<addkey="ObserverLatDD"value="-0.056946961416494392" />
<addkey="ObserverLonDD"value="121.49905414870099" />
<addkey="ObserverAltKMs"value="3.9120639485526882" />
<addkey="TargetLatDD"value="-0.028060602957429747" />
<addkey="TargetLonDD"value="121.49892786453003" />
<addkey="TargetAltKMs"value="0.5625919130259821" />
……

5、以上完成在GlobeControl中控制可操作的范围，如果超出了自动恢复到初始位置。

文章来源：http://blog.csdn.net/sydbc/article/details/17137273