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 SP1 C#

1、在frmMain主窗体中声明IGlobeDisplayEvents_Event事件

private IGlobeDisplayEvents_Event m_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 as IGlobeDisplayEvents_Event;

            m_pGlobeDisplayEvents.AfterDraw += new IGlobeDisplayEvents_AfterDrawEventHandler(m_pGlobeDisplayEvents_AfterDraw);

           

        }

3、重写m_pGlobeDisplayEvents_AfterDraw事件

        public void 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。