|
static private GetShapeHandler ( ShapeType type ) : |
||
| type | ShapeType | The shape file type. |
| return | ||
/// <summary>
/// Reads a record from the specified stream.
/// </summary>
/// <param name="stream">A System.IO.Stream instance to read</param>
/// <param name="recordOffset">An offset of record</param>
/// <param name="bounds">An object representing a bounds of the reading area</param>
public ShapeFileRecord ReadRecord(Stream stream, int?recordOffset, BoundingRectangle bounds)
{
#region old
//if (recordOffset != null)
// stream.Seek(recordOffset.Value, 0);
//ShapeFileRecord record = new ShapeFileRecord();
//record.Offset = stream.Position;
//// заголовок записи
//record.RecordNumber = ShapeFile.ReadInt32_BE(stream);
//record.ContentLength = ShapeFile.ReadInt32_BE(stream);
//// тип геометрической фигуры
//record.ShapeType = ShapeFile.ReadInt32_LE(stream);
//bool wasRead = false;
//switch (record.ShapeType)
//{
// case (int)ShapeType.NullShape:
// break;
// case (int)ShapeType.Point:
// wasRead = ShapeFile.ReadPoint(stream, bounds, record);
// break;
// case (int)ShapeType.PolyLine:
// wasRead = ShapeFile.ReadPolygon(stream, bounds, record);
// break;
// case (int)ShapeType.Polygon:
// wasRead = ShapeFile.ReadPolygon(stream, bounds, record);
// break;
// case (int)ShapeType.Multipoint:
// wasRead = ShapeFile.ReadMultipoint(stream, bounds, record);
// break;
// default:
// {
// string msg = String.Format(System.Globalization.CultureInfo.InvariantCulture, "ShapeType {0} is not supported.", (int)record.ShapeType);
// throw new InvalidDataException(msg);
// }
//}
//if (wasRead)
//{
// this._records.Add(record);
// return record;
//}
//else return null;
#endregion
#region New
if (recordOffset != null)
{
stream.Seek(recordOffset.Value, 0);
}
ShapeFileRecord record = new ShapeFileRecord();
record.Offset = stream.Position;
// заголовок записи
//BigEndianBinaryReader reader = new BigEndianBinaryReader(stream);
//record.RecordNumber = reader.ReadInt32BE();// ShapeFile.ReadInt32_BE(stream);
//record.ContentLength = reader.ReadInt32BE();// ShapeFile.ReadInt32_BE(stream);
record.RecordNumber = stream.ReadInt32BE(); // ShapeFile.ReadInt32_BE(stream);
record.ContentLength = stream.ReadInt32BE(); // ShapeFile.ReadInt32_BE(stream);
// тип геометрической фигуры
record.ShapeType = stream.ReadInt32(); //.ReadInt32BE();// ShapeFile.ReadInt32_LE(stream);
ShapeHandler handler = ShapeFile.GetShapeHandler((ShapeType)record.ShapeType);
if (handler.Read(stream, bounds, record))
{
this._records.Add(record);
return(record);
}
else
{
return(null);
}
#endregion
}
/// <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();
}
}
}
