/// <summary> /// /// </summary> /// <param name="geometryCollection"></param> /// <param name="writer"></param> protected virtual void Write(GeometryCollection geometryCollection, XmlTextWriter writer) { writer.WriteStartElement("MultiGeometry"); for (int i = 0; i < geometryCollection.NumGeometries; i++) { writer.WriteStartElement("geometryMember"); Write(geometryCollection.Geometries[i] as Geometry, writer); writer.WriteEndElement(); } writer.WriteEndElement(); }
/// <summary> /// /// </summary> /// <param name="geometryCollection"></param> /// <returns></returns> protected virtual int SetByteStreamLength(GeometryCollection geometryCollection) { int count = InitValue; foreach (Geometry g in geometryCollection.Geometries) count += SetByteStreamLength(g); return count; }
/// <summary> /// Writes an entire shapefile to disk in one call using a geometryCollection. /// </summary> /// <remarks> /// Assumes the type given for the first geometry is the same for all subsequent geometries. /// For example, is, if the first Geometry is a Multi-polygon/ Polygon, the subsequent geometies are /// Muli-polygon/ polygon and not lines or points. /// The dbase file for the corresponding shapefile contains one column called row. It contains /// the row number. /// </remarks> /// <param name="filename">The filename to write to (minus the .shp extension).</param> /// <param name="geometryCollection">The GeometryCollection to write.</param> public virtual void Write(string filename, GeometryCollection geometryCollection) { System.IO.FileStream shpStream = new System.IO.FileStream(filename + ".shp", System.IO.FileMode.Create); System.IO.FileStream shxStream = new System.IO.FileStream(filename + ".shx", System.IO.FileMode.Create); BigEndianBinaryWriter shpBinaryWriter = new BigEndianBinaryWriter(shpStream); BigEndianBinaryWriter shxBinaryWriter = new BigEndianBinaryWriter(shxStream); // assumes ShapeHandler handler = Shapefile.GetShapeHandler(Shapefile.GetShapeType(geometryCollection.Geometries[0])); IGeometry body; int numShapes = geometryCollection.NumGeometries; // calc the length of the shp file, so it can put in the header. int shpLength = 50; for (int i = 0; i < numShapes; i++) { body = geometryCollection.Geometries[i]; shpLength += 4; // length of header in WORDS shpLength += handler.GetLength(body); // length of shape in WORDS } int shxLength = 50 + (4 * numShapes); // write the .shp header ShapefileHeader ShapeHeader = new ShapefileHeader(); ShapeHeader.FileLength = shpLength; // get envelope in external coordinates IEnvelope env = geometryCollection.EnvelopeInternal; IEnvelope bounds = ShapeHandler.GetEnvelopeExternal(new PrecisionModel(geometryFactory.PrecisionModel), env); ShapeHeader.Bounds = bounds; // assumes Geometry type of the first item will the same for all other items // in the collection. ShapeHeader.ShapeType = Shapefile.GetShapeType(geometryCollection.Geometries[0]); ShapeHeader.Write(shpBinaryWriter); // write the .shx header ShapefileHeader shxHeader = new ShapefileHeader(); shxHeader.FileLength = shxLength; shxHeader.Bounds = ShapeHeader.Bounds; // assumes Geometry type of the first item will the same for all other items in the collection. shxHeader.ShapeType = Shapefile.GetShapeType(geometryCollection.Geometries[0]); shxHeader.Write(shxBinaryWriter); // write the individual records. int _pos = 50; // header length in WORDS for (int i = 0; i < numShapes; i++) { body = geometryCollection.Geometries[i]; int recordLength = handler.GetLength(body); shpBinaryWriter.WriteIntBE(i + 1); shpBinaryWriter.WriteIntBE(recordLength); shxBinaryWriter.WriteIntBE(_pos); shxBinaryWriter.WriteIntBE(recordLength); _pos += 4; // length of header in WORDS handler.Write(body, shpBinaryWriter, geometryFactory); _pos += recordLength; // length of shape in WORDS } shxBinaryWriter.Flush(); shxBinaryWriter.Close(); shpBinaryWriter.Flush(); shpBinaryWriter.Close(); // WriteDummyDbf(filename + ".dbf", numShapes); }