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SkylineGlobe 6.5 如何实现简单多边形的动态绘制 C#示例代码

在Skyline的TEPro软件中，我们可以很容易地绘制出多边形。

那么，在二次开发过程中，该如何绘制一个简单的多边形呢？

通过下面的示例代码，我们可以很容易完成这一项工作。

其中，重点需要了解Geometry对象的定义和使用。

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Windows.Forms;
  9 using TerraExplorerX;
 10 
 11 namespace HelloSkyline
 12 {
 13     public partial class CTerrainPolygon: Form
 14     {
 15         SGWorld65 sgworld = null;
 16         String pbhander = "";        
 17         ITerrainPolygon65 pITPolygon = null;
 18         List<double> ListVerticsArray = new List<double>();
 19 
 20         public CTerrainPolygon()
 21         {
 22             InitializeComponent();
 23 
 24             sgworld = new SGWorld65();
 25             sgworld.OnLButtonDown += new _ISGWorld65Events_OnLButtonDownEventHandler(sgworld_OnLButtonDown);
 26             sgworld.OnRButtonDown += new _ISGWorld65Events_OnRButtonDownEventHandler(sgworld_OnRButtonDown);
 27         }
 28 
 29         bool sgworld_OnRButtonDown(int Flags, int X, int Y)
 30         {
 31             sgworld.Window.SetInputMode(MouseInputMode.MI_FREE_FLIGHT);
 32             pbhander = "";
 33             pITPolygon = null;            
 34             return true;
 35         }
 36 
 37         bool sgworld_OnLButtonDown(int Flags, int X, int Y)
 38         {
 39             IWorldPointInfo65 pIWPInfo = sgworld.Window.PixelToWorld(X, Y, WorldPointType.WPT_TERRAIN);
 40             IPosition65 pIPosition = sgworld.Navigate.GetPosition(AltitudeTypeCode.ATC_ON_TERRAIN);
 41 
 42             if (pbhander == "TerrainPolygon")
 43             {
 44                 if (pITPolygon == null)
 45                 {
 46                     ILinearRing cRing = null;
 47                     double[] cVerticesArray = null;
 48                     cVerticesArray = new double[] {
 49                         pIPosition.X,  pIPosition.Y,  0, 
 50                         pIWPInfo.Position.X,  pIWPInfo.Position.Y,  pIWPInfo.Position.Distance,  
 51                         pIWPInfo.Position.X,  pIWPInfo.Position.Y,  pIWPInfo.Position.Distance,                         
 52                             };
 53                     cRing = sgworld.Creator.GeometryCreator.CreateLinearRingGeometry(cVerticesArray);
 54                     
 55                     uint nLineColor = 0xFF00FF00;
 56                     uint nFillColor = 0x7FFF0000;
 57                     AltitudeTypeCode eAltitudeTypeCode = AltitudeTypeCode.ATC_ON_TERRAIN;
 58                     string gid = CreateGroup("AnalysisTEMP");
 59                     pITPolygon = sgworld.Creator.CreatePolygon(cRing, nLineColor, nFillColor, eAltitudeTypeCode, gid, "Polygon");
 60 
 61                     IPolygon polygonGeometry = pITPolygon.Geometry as IPolygon;
 62                     polygonGeometry.StartEdit();
 63                     foreach (ILinearRing ring in polygonGeometry.Rings)
 64                     {
 65                         double dx = pIWPInfo.Position.X;
 66                         double dy = pIWPInfo.Position.Y;
 67                         double dh = pIWPInfo.Position.Distance;                        
 68                         ring.Points.AddPoint(dx, dy, dh);
 69                         ring.Points.DeletePoint(0);
 70                     }
 71                     IGeometry editedGeometry = polygonGeometry.EndEdit();
 72                     pITPolygon.Geometry = editedGeometry;                
 73                 }
 74                 else
 75                 {
 76                     IPolygon polygonGeometry = pITPolygon.Geometry as IPolygon;
 77                     polygonGeometry.StartEdit();
 78                     foreach (ILinearRing ring in polygonGeometry.Rings)
 79                     {
 80                         double dx = pIWPInfo.Position.X;
 81                         double dy = pIWPInfo.Position.Y;
 82                         double dh = pIWPInfo.Position.Distance;
 83                         ring.Points.AddPoint(dx, dy, dh);
 84                     }
 85                     IGeometry editedGeometry = polygonGeometry.EndEdit();
 86                     pITPolygon.Geometry = editedGeometry;                    
 87                 }
 88             }
 89             return false;
 90         }
 91 
 92         private void button1_Click(object sender, EventArgs e)
 93         {
 94             pbhander = "TerrainPolygon";
 95             sgworld.Window.SetInputMode(MouseInputMode.MI_COM_CLIENT);
 96         }
 97 
 98         private void button2_Click(object sender, EventArgs e)
 99         {
100             string gid = sgworld.ProjectTree.FindItem("AnalysisTEMP");
101             if (gid != null && gid != "")
102             {
103                 sgworld.ProjectTree.DeleteItem(gid);
104             }
105         }
106 
107         private String CreateGroup(String GroupName)
108         {
109             string gid = sgworld.ProjectTree.FindItem(GroupName);
110             if (gid != null && gid != "")
111             {
112                 return gid;
113             }
114             else
115             {
116                 return sgworld.ProjectTree.CreateLockedGroup(GroupName);
117             }            
118         }
119     }
120 }

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原文地址：https://www.cnblogs.com/yitianhe/p/4424438.html