/// <summary>
/// Writes an homogeneus <c>GometryCollection</c> into a binary shapefile.
/// </summary>
/// <param name="geometries">If geometries are not of the same type throws <c>System.ArgumentException</c>.</param>
/// <param name="shapepath">Path of the shapefile to create: will be created a new file using the given path.
/// if file exists throws <c>System.IO.IOException</c>.</param>
public void Write(GeometryCollection geometries, string shapepath)
{
using (Stream stream = new FileStream(shapepath, FileMode.CreateNew, FileAccess.Write, FileShare.None))
{
Write(geometries, stream);
}
}
/// <summary>
/// Writes an homogeneus <c>GometryCollection</c> into a binary stream.
/// </summary>
/// <param name="geometries"></param>
/// <param name="stream"></param>
protected void Write(GeometryCollection geometries, Stream stream)
{
if (!geometries.IsHomogeneous)
throw new ArgumentException("Shapefile does contain only geometries of th esame type!");
// Init counter
recordCounter = 0;
using (BigEndianBinaryWriter beWriter = new BigEndianBinaryWriter(stream))
{
using (BinaryWriter leWriter = new BinaryWriter(stream))
{
// Evaluate stream length
int fileLength = 0;
foreach (Geometry geometry in geometries.Geometries)
fileLength += (shapeWriter.GetBytesLength(geometry) + 8); // 12 is the length of record header
fileLength += 100; // Add main header
WriteHeaderFile(geometries, leWriter, beWriter, (int)(fileLength / 2)); // Write length in 16 bit words!
foreach (Geometry geometry in geometries.Geometries)
Write(geometry, leWriter, beWriter);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="geometries"></param>
/// <param name="beWriter">Big Endian Writer</param>
/// <param name="leWriter">Little Endian Endian Writer</param>
/// <param name="streamLength"></param>
protected void WriteHeaderFile(GeometryCollection geometries, BinaryWriter leWriter, BigEndianBinaryWriter beWriter, int streamLength)
{
// Write stub value for FileCode (big endian)
beWriter.WriteIntBE((int) 9994);
// Write stub values for unused (big endian)
beWriter.WriteIntBE((int) 0);
beWriter.WriteIntBE((int) 0);
beWriter.WriteIntBE((int) 0);
beWriter.WriteIntBE((int) 0);
beWriter.WriteIntBE((int) 0);
// Write stub value for Length (big endian)
beWriter.WriteIntBE((int) streamLength);
// Write version
leWriter.Write((int) 1000);
// Write ShapeTipe
leWriter.Write((int) GetShapeType((Geometry) geometries.Geometries[0]));
// Write values for boundingbox
Envelope envelope = (Envelope) geometries.EnvelopeInternal;
leWriter.Write((double) envelope.MinX);
leWriter.Write((double) envelope.MinY);
leWriter.Write((double) envelope.MaxX);
leWriter.Write((double) envelope.MaxY);
leWriter.Write((double) 0);
leWriter.Write((double) 0);
leWriter.Write((double) 0);
leWriter.Write((double) 0);
}
/// <summary>
/// Transforms a <see cref="GeometryCollection"/>.
/// </summary>
/// <param name="geoms">GeometryCollection to transform</param>
/// <param name="transform">MathTransform</param>
/// <returns>Transformed GeometryCollection</returns>
public static IGeometryCollection TransformGeometryCollection(GeometryCollection geoms, IMathTransform transform)
{
List<IGeometry> coll = new List<IGeometry>(geoms.Geometries.Length);
foreach (IGeometry g in geoms.Geometries)
coll.Add(TransformGeometry(g, transform));
return new GeometryCollection(coll.ToArray());
}
