/// <summary> /// Reads the next shape /// </summary> /// <returns></returns> public IGeometry ReadNext(int RecordNumber) { IntPtr pShape = ShapeLib.SHPReadObject(_shapePointer, RecordNumber); ShapeLib.SHPObject shpObject = new ShapeLib.SHPObject(); Marshal.PtrToStructure(pShape, shpObject); double[] x = new double[shpObject.nVertices]; Marshal.Copy(shpObject.padfX, x, 0, x.Length); double[] y = new double[shpObject.nVertices]; Marshal.Copy(shpObject.padfY, y, 0, y.Length); double[] z = new double[shpObject.nVertices]; Marshal.Copy(shpObject.padfZ, z, 0, z.Length); int[] partstarts = null; if (shpObject.nParts > 0) { partstarts = new int[shpObject.nParts]; Marshal.Copy(shpObject.paPartStart, partstarts, 0, partstarts.Length); } ShapeLib.SHPDestroyObject(pShape); IGeometry geom = null; switch (type) { case ShapeLib.ShapeType.NullShape: break; case ShapeLib.ShapeType.MultiPoint: case ShapeLib.ShapeType.MultiPointZ: case ShapeLib.ShapeType.MultiPointM: case ShapeLib.ShapeType.PointM: case ShapeLib.ShapeType.PointZ: case ShapeLib.ShapeType.Point: geom = new XYPoint(x[0], y[0]); break; case ShapeLib.ShapeType.PolyLineM: case ShapeLib.ShapeType.PolyLineZ: case ShapeLib.ShapeType.PolyLine: geom = new XYPolyline(); for (int i = 0; i < x.Length; i++) { ((XYPolyline)geom).Points.Add(new XYPoint(x[i], y[i])); } break; case ShapeLib.ShapeType.PolygonM: case ShapeLib.ShapeType.PolygonZ: case ShapeLib.ShapeType.Polygon: if (partstarts.Count() == 1) { geom = new XYPolygon(); for (int i = 0; i < x.Length; i++) { ((XYPolygon)geom).Points.Add(new XYPoint(x[i], y[i])); } ((XYPolygon)geom).Points.Reverse(); } else { geom = new MultiPartPolygon(); //foreach (var partstart in partstarts.Reverse()) //{ // var poly = new XYPolygon(); // for (int i = end; i > partstart; i--) // poly.Points.Add(new XYPoint(x[i], y[i])); // end = partstart; // ((MultiPartPolygon)geom).Polygons.Add(poly); //} for (int j = 0; j < partstarts.Count(); j++) { int end; if (j < partstarts.Count() - 1) { end = partstarts[j + 1]; } else { end = x.Length; } var poly = new XYPolygon(); for (int i = partstarts[j]; i < end; i++) { poly.Points.Add(new XYPoint(x[i], y[i])); } poly.Points.Reverse(); ((MultiPartPolygon)geom).Polygons.Add(poly); } } break; case ShapeLib.ShapeType.MultiPatch: break; default: break; } return(geom); }