/// <summary>
/// Writes a <b>Geometry</b> to the file.
/// </summary>
/// <param name="geometry">The <b>Geometry</b> to write to the file.</param>
/// <exception cref="ArgumentNullException">The geometry is a null reference (Nothing in Visual Basic).</exception>
public void WriteGeometry(Geometry geometry)
{
if (geometry == null)
{
throw new ArgumentNullException("geometry");
}
//// if (typeof(geometry == GeometryCollection)
//// {
//// this.WriteGeometryCollection((GeometryCollection)geometry);
//// }
// Make sure we have the same shape type - if not the file is invalid
if (_type == ShapeType.Undefined)
{
_type = Shapefile.GetShapeType(geometry);
}
else if (_type != Shapefile.GetShapeType(geometry))
{
throw new ArgumentException(String.Format(System.Globalization.CultureInfo.InvariantCulture, "An invalid shapet type has been encountered - expected '{0}' but got '{1}.", _type, Shapefile.GetShapeType(geometry)), "geometry");
}
// Get handler
ShapeHandler handler = Shapefile.GetShapeHandler(_type);
// Get the length of the geometry in bytes
int length = handler.GetLength(geometry);
// Write record number
_shpWriter.WriteIntBE(_count + 1);
// Write record length
_shpWriter.WriteIntBE(length);
// Write geometry
handler.Write(geometry, _shpWriter, _factory);
// Increase bounds to include geometry if needed
_bounds.expandToInclude(geometry.getEnvelopeInternal());
// Every time we write a geometry we need to increment the count
_count++;
// Write index information
_shxWriter.WriteIntBE(_shpLength);
_shxWriter.WriteIntBE(length);
// Every time we write a geometry we need to increment the byte length
_shpLength += HEADER_shpLength + length;
}
/// <summary>
/// Writes a shapefile to disk.
/// </summary>
/// <remarks>
/// <para>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.</para>
/// <para>The dbase file for the corresponding shapefile contains one column called row. It contains
/// the row number.</para>
/// </remarks>
/// <param name="filename">The filename to write to (minus the .shp extension).</param>
/// <param name="geometryCollection">The GeometryCollection to write.</param>
/// <param name="geometryFactory">The geometry factory to use.</param>
public static void Write(string filename, GeometryCollection geometryCollection, GeometryFactory geometryFactory)
{
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[0]));
Geometry body;
int numShapes = geometryCollection.GetNumGeometries();
// 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[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 shpHeader = new ShapefileHeader();
shpHeader.FileLength = shpLength;
// get envelopse in external coordinates
Envelope env = geometryCollection.GetEnvelopeInternal();
Envelope bounds = ShapeHandler.GetEnvelopeExternal(geometryFactory.PrecisionModel, env);
shpHeader.Bounds = bounds;
// assumes Geometry type of the first item will the same for all other items
// in the collection.
shpHeader.ShapeType = Shapefile.GetShapeType(geometryCollection[0]);
shpHeader.Write(shpBinaryWriter);
// write the .shx header
ShapefileHeader shxHeader = new ShapefileHeader();
shxHeader.FileLength = shxLength;
shxHeader.Bounds = shpHeader.Bounds;
// assumes Geometry type of the first item will the same for all other items
// in the collection.
shxHeader.ShapeType = Shapefile.GetShapeType(geometryCollection[0]);
shxHeader.Write(shxBinaryWriter);
// write the individual records.
int _pos = 50; // header length in WORDS
for (int i = 0; i < numShapes; i++)
{
body = geometryCollection[i];
int recordLength = handler.GetLength(body);
Debug.Assert(Shapefile.GetShapeType(body) != shpHeader.ShapeType, String.Format("Item {0} in the GeometryCollection is not the same Shapetype as Item 0.", i));
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();
Debug.Assert(_pos != shpLength, "File length in header and actual file length do not match.");
//stream.Close();
//Trace.WriteLineIf(Shapefile.TraceSwitch.Enabled,"File length pos:"+_pos*2+" bytes");
//Trace.WriteLineIf(Shapefile.TraceSwitch.Enabled,"File length pos "+_pos+ " words");
WriteDummyDbf(filename + ".dbf", numShapes);
}
