/// <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);
}