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！

View Code

  1  [Guid("971a527b-d128-4248-aa84-918c8bd08499")]
  2     [ClassInterface(ClassInterfaceType.None)]
  3     [ProgId("DrawProfile.DrawLine3Tool")]
  4     public sealed class DrawLine3Tool : BaseTool,IBaseHeight
  5     {
  6         #region COM Registration Function(s)
  7         [ComRegisterFunction()]
  8         [ComVisible(false)]
  9         static void RegisterFunction(Type registerType)
 10         {
 11             // Required for ArcGIS Component Category Registrar support
 12             ArcGISCategoryRegistration(registerType);
 13 
 14             //
 15 // TODO: Add any COM registration code here
 16 //
 17         }
 18 
 19         [ComUnregisterFunction()]
 20         [ComVisible(false)]
 21         static void UnregisterFunction(Type registerType)
 22         {
 23             // Required for ArcGIS Component Category Registrar support
 24             ArcGISCategoryUnregistration(registerType);
 25 
 26             //
 27 // TODO: Add any COM unregistration code here
 28 //
 29         }
 30 
 31         #region ArcGIS Component Category Registrar generated code
 32         /// <summary>
 33 /// Required method for ArcGIS Component Category registration -
 34 /// Do not modify the contents of this method with the code editor.
 35 /// </summary>
 36         private static void ArcGISCategoryRegistration(Type registerType)
 37         {
 38             string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
 39             SxCommands.Register(regKey);
 40             ControlsCommands.Register(regKey);
 41         }
 42         /// <summary>
 43 /// Required method for ArcGIS Component Category unregistration -
 44 /// Do not modify the contents of this method with the code editor.
 45 /// </summary>
 46         private static void ArcGISCategoryUnregistration(Type registerType)
 47         {
 48             string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
 49             SxCommands.Unregister(regKey);
 50             ControlsCommands.Unregister(regKey);
 51         }
 52 
 53         #endregion
 54         #endregion
 55 
 56         private ISceneHookHelper m_sceneHookHelper = null;
 57         private static IGraphicsContainer3D m_graphicsContainer3D = null;
 58         double m_height = 0;
 59 
 60         public double Height
 61         {
 62             get { return m_height; }
 63             set { m_height = value; }
 64         }
 65         public DrawLine3Tool()
 66         {
 67             //
 68 // TODO: Define values for the public properties
 69 //
 70             base.m_category = "绘制3D线"; //localizable text 
 71             base.m_caption = "DrawLine3Tool";  //localizable text 
 72             base.m_message = "This should work in ArcScene/SceneControl";  //localizable text
 73             base.m_toolTip = "DrawLine3Tool";  //localizable text
 74             base.m_name = "DrawLine3Tool";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
 75             try
 76             {
 77                 //
 78 // TODO: change resource name if necessary
 79 //
 80                 string bitmapResourceName = GetType().Name + ".bmp";
 81                 base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
 82                 base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
 83                
 84             }
 85             catch (Exception ex)
 86             {
 87                 System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
 88             }
 89         }
 90 
 91         #region Overriden Class Methods
 92 
 93         /// <summary>
 94 /// Occurs when this tool is created
 95 /// </summary>
 96 /// <param name="hook">Instance of the application</param>
 97         public override void OnCreate(object hook)
 98         {
 99             try
100             {
101                 m_sceneHookHelper = new SceneHookHelperClass();
102                 m_sceneHookHelper.Hook = hook;
103                 if (m_sceneHookHelper.ActiveViewer == null)
104                 {
105                     m_sceneHookHelper = null;
106                 }
107             }
108             catch
109             {
110                 m_sceneHookHelper = null;
111             }
112 
113             if (m_sceneHookHelper == null)
114                 base.m_enabled = false;
115             else
116                 base.m_enabled = true;
117 
118             // TODO:  Add other initialization code
119         }
120 
121         /// <summary>
122 /// Occurs when this tool is clicked
123 /// </summary>
124         public override void OnClick()
125         {
126             if (m_graphicsContainer3D == null)
127             {
128                 m_graphicsContainer3D = new GraphicsLayer3DClass();
129                 ILayer layer = m_graphicsContainer3D as ILayer;
130                 layer.Name = "绘制";
131                 m_sceneHookHelper.Scene.AddLayer(layer, true);
132             }
133             // TODO: Add DrawLine3Tool.OnClick implementation
134         }
135         IPointCollection m_ptCol = null;
136         IElement pLineElement = null;
137         int i = 0;
138         public override void OnMouseDown(int Button, int Shift, int X, int Y)
139         {
140             if (Button==1)
141             {
142                 double ValueZ = m_height;//假设所单击的点的坐标的Z值为0   
143                 ICamera pCamara = m_sceneHookHelper.Camera;
144                 IRay pRay = pCamara.GetIdentifyRay(X, Y);
145                 IVector3D pVecotor3D = pRay.Vector;
146                 pVecotor3D.Normalize();
147                 double a = (ValueZ - pRay.Origin.Z) / pVecotor3D.ZComponent;
148                 IPoint Pnt = new PointClass();
149                 Pnt.Z = ValueZ;
150                 Pnt.X = pRay.Origin.X + pVecotor3D.XComponent * a;
151                 Pnt.Y = pRay.Origin.Y + pVecotor3D.YComponent * a;
152 
153                 (Pnt as IZAware).ZAware = true;
154 
155                 IElement pElement = new MarkerElementClass();
156                 IRgbColor pColor = new RgbColorClass();
157                 pColor.Red = 255;
158                 //ISimpleMarkerSymbol pMarkerSymbol = new SimpleMarkerSymbolClass();
159 //pMarkerSymbol.Size = 30;
160 //pMarkerSymbol.Color = pColor;
161 //(pElement as IMarkerElement).Symbol = pMarkerSymbol;
162 //pElement.Geometry = Pnt;
163 //pGC3D.AddElement(pElement);
164 //this.axSceneControl1.Scene.SceneGraph.RefreshViewers();
165 
166                 IMarkerSymbol pMarkerSymbol = new SimpleMarker3DSymbolClass();
167                 ((ISimpleMarker3DSymbol)pMarkerSymbol).Style = esriSimple3DMarkerStyle.esriS3DMSSphere;
168                 ((ISimpleMarker3DSymbol)pMarkerSymbol).ResolutionQuality = 1.0;
169 
170                 pMarkerSymbol.Size = 100;
171                 pMarkerSymbol.Color = pColor;
172                 //IElement pElement = new MarkerElementClass();
173                 ((IMarkerElement)pElement).Symbol = pMarkerSymbol;
174 
175                 pElement.Geometry = Pnt;
176                 m_graphicsContainer3D.AddElement(pElement);
177                 object Missing1 = Type.Missing;
178                 i++;
179                 if (i < 2)
180                 {
181                     m_ptCol = new PolylineClass();
182                     pLineElement = new LineElementClass();
183                     m_ptCol.AddPoint(Pnt, ref Missing1, ref Missing1);
184                 }
185                 else
186                 {                  
187                     m_ptCol.AddPoint(Pnt, ref Missing1, ref Missing1);
188                     IPolyline pPolyline = m_ptCol as IPolyline;
189                     IGeometry geometry = (IGeometry)pPolyline;                   
190                     pLineElement.Geometry = geometry;
191                     m_graphicsContainer3D.AddElement(pLineElement);
192                 } 
193                
194             }
195             else if (Button==2)
196             {
197                 IPolyline pPolyline = m_ptCol as IPolyline;
198                 //让Z值生效
199                 IZAware Zaware = pPolyline as IZAware;
200                 Zaware.ZAware = true;
201                 IGeometry geometry = (IGeometry)pPolyline;
202 
203                 //更新到Graphics窗口
204                 pLineElement.Geometry = geometry;
205                 m_graphicsContainer3D.AddElement(pLineElement);
206                 IGraphicsSelection pSelection = m_graphicsContainer3D as IGraphicsSelection;
207                 pSelection.UnselectAllElements();
208                 pSelection.SelectElement(pLineElement);
209                 m_ptCol = null;
210                 i = 0;
211             }
212             m_sceneHookHelper.ActiveViewer.SceneGraph.RefreshViewers();
213             
214         }
215 
216         public override void OnMouseMove(int Button, int Shift, int X, int Y)
217         {
218             // TODO:  Add DrawLine3Tool.OnMouseMove implementation
219         }
220 
221         public override void OnMouseUp(int Button, int Shift, int X, int Y)
222         {
223             // TODO:  Add DrawLine3Tool.OnMouseUp implementation
224         }
225         #endregion
226     }
227     interface IBaseHeight
228     {
229         double Height { get; set; }
230     }

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