/// <summary>
/// Converts a GeometryCollection to <GeometryCollection Tagged
/// Text> format, then Appends it to the writer.
/// </summary>
/// <param name="geometryCollection">The GeometryCollection to process</param>
/// <param name="writer">The output stream writer to Append to.</param>
protected void AppendGeometryCollectionTaggedText(GeometryCollection geometryCollection, TextWriter writer)
{
writer.Write("<g>");
AppendGeometryCollectionText(geometryCollection, writer);
writer.Write("</g>");
}
/// <summary>
/// Converts a GeometryCollection to <GeometryCollection Text > format, then Appends it to the writer.
/// </summary>
/// <param name="geometryCollection">The GeometryCollection to process.</param>
/// <param name="writer">The output stream writer to Append to.</param>
protected void AppendGeometryCollectionText(GeometryCollection geometryCollection, TextWriter writer)
{
if (geometryCollection.IsEmpty())
{
}
else
{
for (int i = 0; i < geometryCollection.GetNumGeometries(); i++)
{
AppendGeometryTaggedText(geometryCollection.GetGeometryN(i), writer);
}
}
}
/// <summary>
/// Converts a GeometryCollection to <GeometryCollection Tagged
/// Text> format, then Appends it to the writer.
/// </summary>
/// <param name="geometryCollection">The GeometryCollection to process</param>
/// <param name="level"></param>
/// <param name="writer">The output stream writer to Append to.</param>
protected void AppendGeometryCollectionTaggedText(GeometryCollection geometryCollection, int level,
StringWriter writer)
{
writer.Write("GEOMETRYCOLLECTION ");
AppendGeometryCollectionText(geometryCollection, level, writer);
}
/// <summary>
/// Converts a GeometryCollection to <GeometryCollection Text > format, then Appends it to the writer.
/// </summary>
/// <param name="geometryCollection">The GeometryCollection to process.</param>
/// <param name="level"></param>
/// <param name="writer">The output stream writer to Append to.</param>
protected void AppendGeometryCollectionText(GeometryCollection geometryCollection, int level,
StringWriter writer)
{
if ( geometryCollection.IsEmpty() )
{
writer.Write("EMPTY");
}
else
{
int level2 = level;
writer.Write("(");
for (int i = 0; i < geometryCollection.GetNumGeometries(); i++)
{
if (i > 0)
{
writer.Write(", ");
level2 = level + 1;
}
//AppendGeometryTaggedText(geometryCollection.GetGeometryN(i), level2, writer);
AppendGeometryTaggedText(geometryCollection.GetGeometryN(i), level2, writer);
}
writer.Write(")");
}
}
/// <summary>
/// Writes a geometrycollection.
/// </summary>
/// <param name="gc">The geometrycollection to be written.</param>
private void WriteGeometryCollection(GeometryCollection gc, byte format)
{
//Get the number of geometries in this geometrycollection.
int numGeometries = gc.GetNumGeometries();
//Write the number of geometries.
_bWriter.Write(numGeometries);
//Loop on the number of geometries.
for(int i = 0; i < numGeometries; i++)
{
//Write the type of each geometry.
WriteType(gc[i]);
//Write each geometry.
WriteGeometry(gc[i], format);
}
}
private bool HasRepeatedPoint(GeometryCollection gc)
{
for (int i = 0; i < gc.GetNumGeometries(); i++)
{
Geometry g = (Geometry)gc.GetGeometryN(i);
if (HasRepeatedPoint(g)) return true;
}
return false;
}
private void AddCollection(GeometryCollection gc)
{
for (int i = 0; i < gc.GetNumGeometries(); i++)
{
Geometry g = (Geometry)gc.GetGeometryN(i);
Add(g);
}
}
/// <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);
}
private void CheckValid(GeometryCollection gc)
{
for (int i = 0; i < gc.GetNumGeometries(); i++)
{
Geometry g = gc.GetGeometryN(i);
CheckValid(g);
if (_validErr != null) return;
}
}
