在SceneControl中交互绘制点和线，通过GraphicLayer3D显示

原创文章，转载请注明出处！

这两天实现了一个在SceneControl中交互绘制点和线，通过GraphicLayer3D显示的类，分享一下！

public IRay ICamera.GetIdentifyVector(int x,int y)得到了射线后，可以根据我想要的点的z值(或x值或y值)推算出另外两个坐标值，从而确定该点。

自己定义了一个IBaseHeight的接口，用于设定鼠标点击产生点的基准高程！按照这种思路完全可以开发更加复杂的图形绘制！

 [Guid("971a527b-d128-4248-aa84-918c8bd08499")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("DrawProfile.DrawLine3Tool")]
    public sealed class DrawLine3Tool : BaseTool,IBaseHeight
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
// TODO: Add any COM registration code here
//
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
// TODO: Add any COM unregistration code here
//
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
/// Required method for ArcGIS Component Category registration -
/// Do not modify the contents of this method with the code editor.
/// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            SxCommands.Register(regKey);
            ControlsCommands.Register(regKey);
        }
        /// <summary>
/// Required method for ArcGIS Component Category unregistration -
/// Do not modify the contents of this method with the code editor.
/// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            SxCommands.Unregister(regKey);
            ControlsCommands.Unregister(regKey);
        }

        #endregion
        #endregion

        private ISceneHookHelper m_sceneHookHelper = null;
        private static IGraphicsContainer3D m_graphicsContainer3D = null;
        double m_height = 0;

        public double Height
        {
            get { return m_height; }
            set { m_height = value; }
        }
        public DrawLine3Tool()
        {
            //
// TODO: Define values for the public properties
//
            base.m_category = "绘制3D线"; //localizable text 
            base.m_caption = "DrawLine3Tool";  //localizable text 
            base.m_message = "This should work in ArcScene/SceneControl";  //localizable text
            base.m_toolTip = "DrawLine3Tool";  //localizable text
            base.m_name = "DrawLine3Tool";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
            try
            {
                //
// TODO: change resource name if necessary
//
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
                base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
               
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overriden Class Methods

        /// <summary>
/// Occurs when this tool is created
/// </summary>
/// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            try
            {
                m_sceneHookHelper = new SceneHookHelperClass();
                m_sceneHookHelper.Hook = hook;
                if (m_sceneHookHelper.ActiveViewer == null)
                {
                    m_sceneHookHelper = null;
                }
            }
            catch
            {
                m_sceneHookHelper = null;
            }

            if (m_sceneHookHelper == null)
                base.m_enabled = false;
            else
                base.m_enabled = true;

            // TODO:  Add other initialization code
        }

        /// <summary>
/// Occurs when this tool is clicked
/// </summary>
        public override void OnClick()
        {
            if (m_graphicsContainer3D == null)
            {
                m_graphicsContainer3D = new GraphicsLayer3DClass();
                ILayer layer = m_graphicsContainer3D as ILayer;
                layer.Name = "绘制";
                m_sceneHookHelper.Scene.AddLayer(layer, true);
            }
            // TODO: Add DrawLine3Tool.OnClick implementation
        }
        IPointCollection m_ptCol = null;
        IElement pLineElement = null;
        int i = 0;
        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            if (Button==1)
            {
                double ValueZ = m_height;//假设所单击的点的坐标的Z值为0   
                ICamera pCamara = m_sceneHookHelper.Camera;
                IRay pRay = pCamara.GetIdentifyRay(X, Y);
                IVector3D pVecotor3D = pRay.Vector;
                pVecotor3D.Normalize();
                double a = (ValueZ - pRay.Origin.Z) / pVecotor3D.ZComponent;
                IPoint Pnt = new PointClass();
                Pnt.Z = ValueZ;
                Pnt.X = pRay.Origin.X + pVecotor3D.XComponent * a;
                Pnt.Y = pRay.Origin.Y + pVecotor3D.YComponent * a;

                (Pnt as IZAware).ZAware = true;

                IElement pElement = new MarkerElementClass();
                IRgbColor pColor = new RgbColorClass();
                pColor.Red = 255;
                //ISimpleMarkerSymbol pMarkerSymbol = new SimpleMarkerSymbolClass();
//pMarkerSymbol.Size = 30;
//pMarkerSymbol.Color = pColor;
//(pElement as IMarkerElement).Symbol = pMarkerSymbol;
//pElement.Geometry = Pnt;
//pGC3D.AddElement(pElement);
//this.axSceneControl1.Scene.SceneGraph.RefreshViewers();

                IMarkerSymbol pMarkerSymbol = new SimpleMarker3DSymbolClass();
                ((ISimpleMarker3DSymbol)pMarkerSymbol).Style = esriSimple3DMarkerStyle.esriS3DMSSphere;
                ((ISimpleMarker3DSymbol)pMarkerSymbol).ResolutionQuality = 1.0;

                pMarkerSymbol.Size = 100;
                pMarkerSymbol.Color = pColor;
                //IElement pElement = new MarkerElementClass();
                ((IMarkerElement)pElement).Symbol = pMarkerSymbol;

                pElement.Geometry = Pnt;
                m_graphicsContainer3D.AddElement(pElement);
                object Missing1 = Type.Missing;
                i++;
                if (i < 2)
                {
                    m_ptCol = new PolylineClass();
                    pLineElement = new LineElementClass();
                    m_ptCol.AddPoint(Pnt, ref Missing1, ref Missing1);
                }
                else
                {                  
                    m_ptCol.AddPoint(Pnt, ref Missing1, ref Missing1);
                    IPolyline pPolyline = m_ptCol as IPolyline;
                    IGeometry geometry = (IGeometry)pPolyline;                   
                    pLineElement.Geometry = geometry;
                    m_graphicsContainer3D.AddElement(pLineElement);
                } 
               
            }
            else if (Button==2)
            {
                IPolyline pPolyline = m_ptCol as IPolyline;
                //让Z值生效
                IZAware Zaware = pPolyline as IZAware;
                Zaware.ZAware = true;
                IGeometry geometry = (IGeometry)pPolyline;

                //更新到Graphics窗口
                pLineElement.Geometry = geometry;
                m_graphicsContainer3D.AddElement(pLineElement);
                IGraphicsSelection pSelection = m_graphicsContainer3D as IGraphicsSelection;
                pSelection.UnselectAllElements();
                pSelection.SelectElement(pLineElement);
                m_ptCol = null;
                i = 0;
            }
            m_sceneHookHelper.ActiveViewer.SceneGraph.RefreshViewers();
            
        }

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add DrawLine3Tool.OnMouseMove implementation
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add DrawLine3Tool.OnMouseUp implementation
        }
        #endregion
    }
    interface IBaseHeight
    {
        double Height { get; set; }
    }

参考文章：http://blog.csdn.net/sunqunsunqun/article/details/6946652，感谢sunqunsunqun