/// <summary>
/// Converts a Geometry to its well-known text representation.
/// </summary>
/// <param name="geometry"> a Geometry to process
/// </param>
/// <returns>
/// A <Geometry Tagged Text> string (see the OpenGIS Simple
/// Features Specification)
/// </returns>
private void WriteFormatted(Geometry geometry, bool isFormatted,
TextWriter writer)
{
m_bIsFormatted = isFormatted;
if (m_bIncludeSRID)
{
// try writing..."SRID=4326;GEOMETRY(...)"
IGeometryProperties properties = geometry.Properties;
if (properties != null && properties.Count > 0 &&
properties.Contains("SRID"))
{
int nSRID = (int)properties["SRID"];
if (nSRID > 0)
{
writer.Write("SRID=");
writer.Write(nSRID.ToString());
writer.Write(";");
}
}
}
WriteGeometry(geometry, 0, writer);
}
/// <summary>
///
/// </summary>
/// <param name="writer"></param>
/// <param name="strGeometry"></param>
/// <param name="geometry"></param>
/// <param name="addSRID"></param>
/// <returns></returns>
private bool WriteStartElement(XmlWriter writer, string strGeometry,
Geometry geometry, bool addSRID)
{
bool usePrefix = false;
if (m_bUsePrefix && (m_strPrefix != null && m_strPrefix.Length != 0))
{
usePrefix = true;
}
if (usePrefix)
{
writer.WriteStartElement(m_strPrefix, strGeometry, null);
}
else
{
writer.WriteStartElement(strGeometry);
}
IGeometryProperties properties = null;
if (geometry != null)
{
properties = geometry.Properties;
}
if (properties != null && properties.Count > 0)
{
if (properties.Contains("GID"))
{
string strGID = (string)properties["GID"];
if (strGID != null && strGID.Length > 0)
{
if (usePrefix)
{
writer.WriteAttributeString(m_strPrefix,
GeometryGml2.GmlGid, null, strGID);
}
else
{
writer.WriteAttributeString(GeometryGml2.GmlGid, strGID);
}
}
}
if (addSRID && properties.Contains("SRID"))
{
int nSRID = (int)properties["SRID"];
if (nSRID > 0)
{
string strSRID = m_bUseEpsgSrs ?
GeometryGml2.GmlAttrEpsgSrsname + nSRID.ToString() :
nSRID.ToString();
if (usePrefix)
{
writer.WriteAttributeString(m_strPrefix,
GeometryGml2.GmlAttrSrsname, null, strSRID);
}
else
{
writer.WriteAttributeString(
GeometryGml2.GmlAttrSrsname, strSRID);
}
}
}
}
return(usePrefix);
}
private bool WritePostGIS(Geometry geometry)
{
// 1. Determine the geometry parameters
CoordinateType coordType = CoordinateType.Default;
IGeometryProperties geomProp = geometry.Properties;
GeometryFactory geomFactory = geometry.Factory;
int nDimension = geometry.CoordinateDimension;
GeometryType geomType = geometry.GeometryType;
if (geomFactory != null)
{
coordType = geomFactory.CoordinateType;
}
int nSRID = -1;
if (geomProp != null && geomProp.Contains("SRID"))
{
nSRID = Convert.ToInt32(geomProp["SRID"]);
}
// 2. Write the bye order
WriteByteOrder();
// 3. Write the geometry type word
int geomWkbType = (int)GetWkbType(geomType);
uint geomTypeWord = (uint)geomWkbType;
if (nDimension > 2)
{
geomTypeWord |= 0x80000000;
}
if (coordType == CoordinateType.Measured)
{
geomTypeWord |= 0x40000000;
}
if (nSRID > 0)
{
geomTypeWord |= 0x20000000;
}
WriterGeometryType((int)geomTypeWord);
// 4. Write the spatial reference ID, if any
if (nSRID > 0)
{
WriteInt(nSRID);
}
if (geomType == GeometryType.Point)
{
return(WritePostGIS((Point)geometry));
}
else if (geomType == GeometryType.LineString)
{
return(WritePostGIS((LineString)geometry));
}
else if (geomType == GeometryType.Polygon)
{
return(WritePostGIS((Polygon)geometry));
}
else if (geomType == GeometryType.MultiPoint)
{
return(WritePostGIS((MultiPoint)geometry));
}
else if (geomType == GeometryType.MultiLineString)
{
return(WritePostGIS((MultiLineString)geometry));
}
else if (geomType == GeometryType.MultiPolygon)
{
return(WritePostGIS((MultiPolygon)geometry));
}
else if (geomType == GeometryType.GeometryCollection)
{
return(WritePostGIS((GeometryCollection)geometry));
}
else
{
throw new GeometryIOException("The well-known binary format for "
+ "this Geometry does not exist: " + geometry.Name);
}
}
public byte[] Write(Geometry geometry, BytesOrder order)
{
if (geometry == null)
{
throw new ArgumentNullException("geometry");
}
m_objWriter.Initialize();
m_objWriter.Order = order;
GeometryWkbMode mode = GeometryWkbMode.Standard;
GeometryFactory factory = geometry.Factory;
if (factory != null)
{
CoordinateType coordType = factory.CoordinateType;
if (coordType == CoordinateType.Measured)
{
mode = GeometryWkbMode.PostGIS;
}
else
{
IGeometryProperties properties = geometry.Properties;
if (properties != null && properties.Contains("SRID"))
{
mode = GeometryWkbMode.PostGIS;
}
else
{
int dim = factory.CoordinateDimension;
if (dim == 3)
{
mode = GeometryWkbMode.Proposed;
}
}
}
}
bool bResult = false;
byte[] geomBytes = null;
switch (mode)
{
case GeometryWkbMode.Standard:
bResult = WriteStandard(geometry);
break;
case GeometryWkbMode.Proposed:
bResult = WriteProposed(geometry);
break;
case GeometryWkbMode.PostGIS:
bResult = WritePostGIS(geometry);
break;
case GeometryWkbMode.Custom:
bResult = WriteCustom(geometry);
break;
}
if (bResult)
{
geomBytes = m_objWriter.GetBuffer();
}
m_objWriter.Uninitialize(); // reset the buffer
return(geomBytes);
}