/// <summary>
/// Читает запись представляющую полигон.
/// </summary>
/// <param name="file">Входной поток</param>
/// <param name="record">Запись Shape-файла в которую будет помещена прочитанная информация</param>
/// <param name="bounds">Ограничивающий прямоугольник, с которым должен пересекаться ограничивающий прямоугольник записи</param>
public override bool Read(/*BigEndianBinaryReader*/ Stream file, BoundingRectangle bounds, ShapeFileRecord record)
{
record.MinX = file.ReadDouble(); // ShapeFile.ReadDouble64_LE(stream);
record.MinY = file.ReadDouble(); //ShapeFile.ReadDouble64_LE(stream);
record.MaxX = file.ReadDouble();; // ShapeFile.ReadDouble64_LE(stream);
record.MaxY = file.ReadDouble();; // ShapeFile.ReadDouble64_LE(stream);
int numParts = file.ReadInt32(); // ShapeFile.ReadInt32_LE(stream);
int numPoints = file.ReadInt32(); //ShapeFile.ReadInt32_LE(stream);
if (!ShapeHandler.IsRecordInView(bounds, record))
{
file.Seek((long)numPoints * 16 + numParts * 4, SeekOrigin.Current);
return(false);
}
for (int i = 0; i < numParts; i++)
{
record.Parts.Add(file.ReadInt32());//ShapeFile.ReadInt32_LE(stream));
}
for (int i = 0; i < numPoints; i++)
{
ICoordinate p =
PlanimetryEnvironment.NewCoordinate(
file.ReadDouble(), //ShapeFile.ReadDouble64_LE(stream),
file.ReadDouble()); //ShapeFile.ReadDouble64_LE(stream));
record.Points.Add(p);
}
return(true);
}
/// <summary>
/// Writes shapes.
/// </summary>
/// <param name="filename">The string value defining shape file name without .shp extension</param>
/// <param name="geometryCollection"> MapAround.Geometry.GeometryCollection instance containing
/// the geometries to write to shape file</param>
public void WriteShapes(string filename, GeometryCollection geometryCollection)
{
if (geometryCollection.HasDifferentTypeInstances)
{
throw new ArgumentException("Geometries in the shape file should be the instances of the same type.", "geometryCollection");
}
using (FileStream shpStream = new FileStream(filename + ".shp", FileMode.Create))
{
using (FileStream shxStream = new FileStream(filename + ".shx", FileMode.Create))
{
BigEndianBinaryWriter shpBinaryWriter = new BigEndianBinaryWriter(shpStream); //, Encoding.ASCII);
BigEndianBinaryWriter shxBinaryWriter = new BigEndianBinaryWriter(shxStream); //, Encoding.ASCII);
// body type and a handler
Handlers.ShapeHandler handler = ShapeFile.GetShapeHandler(ShapeFile.GetShapeType(geometryCollection[0]));//.Geometries[0]));
int numShapes = geometryCollection.Count;
// calc the length of the shp file, so it can put in the header.
int shpLength = 50;
for (int i = 0; i < numShapes; i++)
{
IGeometry body = (IGeometry)geometryCollection[i]; //.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 shpHeader = new ShapeFileHeader();
shpHeader.FileLength = shpLength;
// get envelope in external coordinates
BoundingRectangle bounds = geometryCollection.GetBoundingRectangle();
shpHeader.SetBounds(bounds);
shpHeader.FileCode = 9994;
shpHeader.ShapeType = (int)ShapeFile.GetShapeType(geometryCollection[0]);//.Geometries[0]);
shpHeader.Write(shpBinaryWriter, ShapeFile.GetShapeType(geometryCollection[0]));
// write the .shx header
ShapeFileHeader shxHeader = new ShapeFileHeader();
shxHeader.FileLength = shxLength;
shxHeader.SetBounds(shpHeader);//.Bounds = shpHeader.Bounds;
// assumes Geometry type of the first item will the same for all other items in the collection.
shxHeader.FileCode = 9994;
shxHeader.ShapeType = (int)ShapeFile.GetShapeType(geometryCollection[0]);
shxHeader.Write(shxBinaryWriter, ShapeFile.GetShapeType(geometryCollection[0]));
// write the individual records.
int _pos = 50; // header length in WORDS
for (int i = 0; i < numShapes; i++)
{
IGeometry body = geometryCollection[i];//.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();
}
}
}
