ArcObjects中的IGeometry转成Json

来源：互联网发布：fdm和idm 知乎编辑：程序博客网时间：2024/04/30 22:18

昨天发了将Json格式的描述转换为Web API中的Geometry，今天发一个将ArcObjects中的IGeometry转成Json。

 private string Geometry2Json(IGeometry pGeo)        {            int wkid = pGeo.SpatialReference.FactoryCode;            ESRI.ArcGIS.Geometry.IPoint pPoint = null;            ESRI.ArcGIS.Geometry.IPointCollection pPoints = null;            double x, y;            StringBuilder sb = new StringBuilder("{");            sb.Append(@"""geometries""" + ":{");            switch (pGeo.GeometryType)            {                #region Point2Json                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:                    pPoint = pGeo as ESRI.ArcGIS.Geometry.IPoint;                    pPoint.QueryCoords(out x, out y);                    string json = @"{""x"":" + x + @",""y"":" + y + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}";                    sb.Append(@"""point"":" + json);                      break;                #endregion                #region Polyline2Json                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:                    pPoints = pGeo as ESRI.ArcGIS.Geometry.IPointCollection;                    IPolyline pPolyline = pGeo as IPolyline;                    IGeometryCollection pGeoetryCollection = pPolyline as IGeometryCollection;                    if (pGeoetryCollection.GeometryCount >= 1)                    {                        sb.Append(@"""paths"":[");                        for (int i = 0; i < pGeoetryCollection.GeometryCount; i++)                        {                            //paths可能有多个path，而每一个path是多个点，用两个for循环                            if (pGeoetryCollection.get_Geometry(i) is IPath)                            {                                sb.Append("[");                                pPoints = pGeoetryCollection.get_Geometry(i) as IPointCollection;                                for (int j = 0; j < pPoints.PointCount;j++ )                                {                                    pPoint = pPoints.get_Point(j);                                    pPoint.QueryCoords(out x, out y);                                    sb.Append("[" + x + "," + y + "],");                                }                                sb.Remove(sb.Length - 1, 1);                                sb.Append("]");                            }                        }                        sb.Append("]" + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}");                                          }                                        break;                #endregion                #region Polygon2Json                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:                    pPoints = pGeo as ESRI.ArcGIS.Geometry.IPointCollection;                    IPolygon pPolygon = pGeo as IPolygon;                    //外环和内环？面的构造比较复杂，在AO中我们可以获取内环和外环，如果注意过在客户端API中的Rings数组，似乎看不出，所以这里我没采用外环和内环的构造方式，但是代码在后面附上。                                      IGeometryCollection pGeoetryCollection1 = pPolygon as IGeometryCollection;                    if (pGeoetryCollection1.GeometryCount >=1)                    {                        sb.Append(@"""rings"":[");                        for (int i = 0; i < pGeoetryCollection1.GeometryCount; i++)                        {                            if (pGeoetryCollection1.get_Geometry(i) is IRing)                            {                                sb.Append("[");                                pPoints = pGeoetryCollection1.get_Geometry(i) as IPointCollection;                                for (int j = 0; j < pPoints.PointCount;j++ )                                {                                                                   pPoint = pPoints.get_Point(j);                                    pPoint.QueryCoords(out x, out y);                                    sb.Append("[" + x + "," + y + "],");                                }                                sb.Remove(sb.Length - 1, 1);                                sb.Append("]");                            }                        }                        sb.Append("]" + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}");                                       }                                       break;                #endregion            }            sb.Append("}");            //添加Geometry            sb.Append("}");            return sb.ToString();        }

下面是获取面的内环和外环的坐标

      public  void PolygonToString(IPolygon4 polygon)        {               IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;                IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;                Trace.WriteLine("polygon.ExteriorRingCount = "+ exteriorRingGeometryCollection.GeometryCount);                for(int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)               {                     Trace.WriteLine("polygon.ExteriorRing["+ i +"]");                      IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);                      IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;                      for(int j = 0; j < exteriorRingPointCollection.PointCount; j++)                      {                            Trace.WriteLine("Point["+ j +"] = "+ PointToString(exteriorRingPointCollection.get_Point(j)));                      }                      IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);                      IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;                      Trace.WriteLine("polygon.InteriorRingCount[exteriorRing"+ i +"] = "+ interiorRingGeometryCollection.GeometryCount);                      for(int k = 0; k < interiorRingGeometryCollection.GeometryCount; k++)                      {                            Trace.WriteLine("polygon.InteriorRing["+ k +"]");                             IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);                             IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;                             for(int m = 0; m < interiorRingPointCollection.PointCount; m++)                             {                                   Trace.WriteLine("Point["+ m +"] = "+ PointToString(interiorRingPointCollection.get_Point(m)));                             }                      }               }        }        private   string PointToString(IPoint point)        {           return(point.X +", "+ point.Y +", "+ point.Z);        }