private void ReadHeader()
{
//FileCode
int fileCode = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
if (fileCode != 9994)
{
throw new Exception("文件不是ESRI Shape Files文件头！");
}
//Skip 20 bytes unused (5 integer)
_brMainFile.ReadBytes(20);
//File length
_fileLength = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4)) * 2;
if (_fileLength != _fsMainFile.Length)
{
throw new Exception("ESRI Shape Files文件未正确结束！");
}
//Version
int Version = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));
//Shape Type
int ShapeType = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));
_shapeType = (enumShapeType)ShapeType;
_envelope.MinX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MinY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MaxX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MaxY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
AdjustZeroWidthEnvelope(_envelope);
//Skip minZ,maxZ,minM,maxM
_brMainFile.ReadBytes(8 * 4);
_fileHeaderSize = _fsMainFile.Position;
}
private long GetHeaderSizeAndFileLength(FileStream fsMainFile, BinaryReader brMainFile, out int fileLength)
{
//FileCode
int fileCode = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4));
if (fileCode != 9994)
{
throw new Exception("文件不是ESRI Shape Files文件头！");
}
//Skip 20 bytes unused (5 integer)
brMainFile.ReadBytes(20);
//File length
fileLength = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4)) * 2;
if (fileLength != fsMainFile.Length)
{
throw new Exception("ESRI Shape Files文件未正确结束！");
}
//Version
int Version = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
//Shape Type
int ShapeType = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
//
Envelope evp = new Envelope();
evp.MinX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MinY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MaxX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MaxY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
//Skip minZ,maxZ,minM,maxM
brMainFile.ReadBytes(8 * 4);
return(fsMainFile.Position);
}
private void WriteShapeMultiPointRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
byte[] byteArray;
ShapeMultiPoint mulPoint;
Int32 contentLength;
if (_currentShxRecondPosition != 0)
{
_fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
}
if (_currentShpRecondPosition != 0)
{
_fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
}
for (int i = 0; i < vfs.Length; i++)
{
mulPoint = vfs[i].Geometry as ShapeMultiPoint;
contentLength = (mulPoint.Points.Length * 16 + 48) / 2;
byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(contentLength);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(_offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_offset += contentLength;
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Points.Length);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
foreach (ShapePoint sp in mulPoint.Points)
{
byteArray = BitConverter.GetBytes(sp.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(sp.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
_currentShpRecondPosition = _fsMainFile.Position;
_currentShxRecondPosition = _fsShxFile.Position;
}
private void WriteShapePointRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
Int32 Offset = 50;
byte[] byteArray;
ShapePoint point;
for (int i = 0; i < vfs.Length; i++)
{
point = vfs[i].Geometry as ShapePoint;
byteArray = BitConverter.GetBytes(i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(14);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(Offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
Offset += 14;
////
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(point.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(point.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
private float ComputeSizeAndCount(string mainFile, string shxFile, out int featureCount)
{
featureCount = 0;
int pointCount = 0;
FileStream fsMainFile = null, fsShxFile = null;
BinaryReader brMainFile = null, brShxFile = null;
try
{
fsMainFile = new FileStream(mainFile, FileMode.Open, FileAccess.Read);
brMainFile = new BinaryReader(fsMainFile);
fsShxFile = new FileStream(shxFile, FileMode.Open, FileAccess.Read);
brShxFile = new BinaryReader(fsShxFile);
//
int fileLength = 0;
long headerSize = GetHeaderSizeAndFileLength(fsMainFile, brMainFile, out fileLength);
//
featureCount = 0;
fsMainFile.Seek(headerSize, SeekOrigin.Begin);
while (fsMainFile.Position < fileLength)
{
//Record header
int oid = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4));
int contentSize = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4));//16bit 字为单位
byte[] contentBytes = brMainFile.ReadBytes(contentSize * 2);
pointCount += GetPointCount(contentBytes, oid, fsMainFile);
//
featureCount++;
}
//
float memorySize = pointCount * 8f * 2f; //x double, y double
memorySize += featureCount * 100; //100 bytes per feature
memorySize += 1024; //1024 bytes per feature layer
return(memorySize);
}
finally
{
if (brMainFile != null)
{
brMainFile.Dispose();
}
if (fsMainFile != null)
{
fsMainFile.Dispose();
}
if (fsShxFile != null)
{
fsShxFile.Dispose();
}
if (brShxFile != null)
{
brShxFile.Dispose();
}
}
}
private void WriteShapeMultiPointRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
Int32 Offset = 50;
byte[] byteArray;
ShapeMultiPoint mulPoint;
Int32 contentLength;
for (int i = 0; i < vfs.Length; i++)
{
mulPoint = vfs[i].Geometry as ShapeMultiPoint;
contentLength = (mulPoint.Points.Length * 16 + 48) / 2;
byteArray = BitConverter.GetBytes(i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(contentLength);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(Offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
Offset += contentLength;
////
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(mulPoint.Points.Length);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
foreach (ShapePoint sp in mulPoint.Points)
{
byteArray = BitConverter.GetBytes(sp.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(sp.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
}
public void ReadRecords(IProgressTracker tracker)
{
lock (_fsMainFile)
{
if (_isLoaded)
{
return;
}
try
{
_dbfReader = new DbaseReader(_dbffile);
_featureCount = 0;
_features = new List <Feature>();
while (_fsMainFile.Position < _fileLength)
{
//Record header
int oid = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
int contentSize = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));//16bit 字为单位
//if (contentSize < 0)
// Console.WriteLine("");
byte[] contentBytes = _brMainFile.ReadBytes(contentSize * 2);
object obj = BytesToFeature(contentBytes, oid);
_features.Add(obj as Feature);
//
_featureCount++;
}
if (_argOfLeveling != null && _argOfLeveling.Enabled && _shapeType == enumShapeType.Point)
{
//int bTime = Environment.TickCount;
using (LevelAdjuster set = new LevelAdjuster())
{
set.BeginLevel = _argOfLeveling.BeginLevel;
set.GridSize = _argOfLeveling.GridSize;
set.Features = _features.ToArray();
set.Do();
}
//int eTime = Environment.TickCount - bTime;
}
}
catch
{
throw;
}
finally
{
_isLoaded = true;
}
}
}
public void FetchFeatures(Action <Feature> action)
{
using (_dbfReader = new DbaseReader(_dbffile))
{
_fsMainFile.Seek(_fileHeaderSize, SeekOrigin.Begin);
while (_fsMainFile.Position < _fileLength)
{
int oid = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
int contentSize = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));//16bit 字为单位
byte[] contentBytes = _brMainFile.ReadBytes(contentSize * 2);
object obj = BytesToFeature(contentBytes, oid);
action(obj as Feature);
}
}
}
private Feature ReadFirstFromFile()
{
using (_dbfReader = new DbaseReader(_dbffile))
{
_fsMainFile.Seek(_fileHeaderSize, SeekOrigin.Begin);
while (_fsMainFile.Position < _fileLength)
{
int oid = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
int contentSize = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));//16bit 字为单位
byte[] contentBytes = _brMainFile.ReadBytes(contentSize * 2);
object obj = BytesToFeature(contentBytes, oid);
return(obj as Feature);
}
return(null);
}
}
public Feature[] FetchFeatures()
{
using (_dbfReader = new DbaseReader(_dbffile))
{
_fsMainFile.Seek(_fileHeaderSize, SeekOrigin.Begin);
List <Feature> retFeatures = new List <Feature>();
while (_fsMainFile.Position < _fileLength)
{
int oid = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
int contentSize = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));//16bit 字为单位
byte[] contentBytes = _brMainFile.ReadBytes(contentSize * 2);
object obj = BytesToFeature(contentBytes, oid);
retFeatures.Add(obj as Feature);
}
return(retFeatures.Count > 0 ? retFeatures.ToArray() : null);
}
}
private void WriteShapePointRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
byte[] byteArray;
ShapePoint point;
if (_currentShxRecondPosition != 0)
{
_fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
}
if (_currentShpRecondPosition != 0)
{
_fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
}
for (int i = 0; i < vfs.Length; i++)
{
point = vfs[i].Geometry as ShapePoint;
byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(10);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(_offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_offset += 14;
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(point.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(point.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
_currentShpRecondPosition = _fsMainFile.Position;
_currentShxRecondPosition = _fsShxFile.Position;
}
private void WriteFileHeader(Feature[] features)
{
if (_isFirstWrite)
{
byte[] byteArray;
Envelope env = features[0].Geometry.Envelope;
for (int i = 1; i < features.Length; i++)
{
env.UnionWith(features[i].Geometry.Envelope);
}
_currentEnvelope = env;
byteArray = BitConverter.GetBytes(9994);
int byteArrayValue = ToLocalEndian.ToInt32FromBig(byteArray);
_bwMainFile.Write(byteArrayValue);
_bwShxFile.Write(byteArrayValue);
byteArray = new byte[20];
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
//
byteArray = BitConverter.GetBytes(CalculateMainfileLengthInByte(features) / 2);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(CalculateShxfileLenthInByte(features) / 2);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
//
_bwMainFile.Write(1000);
_bwShxFile.Write(1000);
_bwMainFile.Write((int)_shapeType);
_bwShxFile.Write((int)_shapeType);
byteArray = BitConverter.GetBytes(env.MinX);
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
byteArray = BitConverter.GetBytes(env.MinY);
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
byteArray = BitConverter.GetBytes(env.MaxX);
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
byteArray = BitConverter.GetBytes(env.MaxY);
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
byteArray = new byte[32];
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
_isFirstWrite = false;
}
else
{
byte[] byteArray;
Envelope env = features[0].Geometry.Envelope;
for (int i = 1; i < features.Length; i++)
{
env.UnionWith(features[i].Geometry.Envelope);
}
if (_currentEnvelope != null)
{
env.UnionWith(_currentEnvelope);
}
_currentEnvelope = env;
_fsMainFile.Seek(24, SeekOrigin.Begin);
_fsShxFile.Seek(24, SeekOrigin.Begin);
byteArray = BitConverter.GetBytes(CalculateMainfileLengthInByte(features) / 2);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(CalculateShxfileLenthInByte(features) / 2);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
_fsMainFile.Seek(8, SeekOrigin.Current);
_fsShxFile.Seek(8, SeekOrigin.Current);
byteArray = BitConverter.GetBytes(env.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
private void WriteShapePolygonRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
byte[] byteArray;
ShapePolygon polygon;
Int32 contentLength;
Int32 pointsNum = 0;
Int32 index = 0;
if (_currentShxRecondPosition != 0)
{
_fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
}
if (_currentShpRecondPosition != 0)
{
_fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
}
for (int i = 0; i < vfs.Length; i++)
{
polygon = vfs[i].Geometry as ShapePolygon;
pointsNum = 0;
index = 0;
contentLength = (44 + polygon.Rings.Length * 4) / 2;
foreach (ShapeRing part in polygon.Rings)
{
contentLength += part.Points.Length * 8;
pointsNum += part.Points.Length;
}
byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(_offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_offset += contentLength + 4;
byteArray = BitConverter.GetBytes(contentLength);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Rings.Length);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(pointsNum);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
foreach (ShapeRing sr in polygon.Rings)
{
byteArray = BitConverter.GetBytes(index);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
index += sr.Points.Length;
}
foreach (ShapeRing sr in polygon.Rings)
{
foreach (ShapePoint sp in sr.Points)
{
byteArray = BitConverter.GetBytes(sp.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(sp.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
}
_currentShpRecondPosition = _fsMainFile.Position;
_currentShxRecondPosition = _fsShxFile.Position;
}
private void WriteShapePolylineRecords(Feature[] vfs)
{
byte[] byteArray;
ShapePolyline polyLine;
Int32 contentLength;
if (_currentShxRecondPosition != 0)
{
_fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
}
if (_currentShpRecondPosition != 0)
{
_fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
}
for (int i = 0; i < vfs.Length; i++)
{
polyLine = vfs[i].Geometry as ShapePolyline;
contentLength = (44 + polyLine.Parts.Length * 4) / 2;
int pointsNum = 0;
int index = 0;
foreach (ShapeLineString part in polyLine.Parts)
{
contentLength += part.Points.Length * 8;
pointsNum += part.Points.Length;
}
byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(_offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_offset += contentLength + 4;
byteArray = BitConverter.GetBytes(contentLength);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwMainFile.Write((int)_shapeType);
_bwMainFile.Write(polyLine.Envelope.MinX);
_bwMainFile.Write(polyLine.Envelope.MinY);
_bwMainFile.Write(polyLine.Envelope.MaxX);
_bwMainFile.Write(polyLine.Envelope.MaxY);
_bwMainFile.Write(polyLine.Parts.Length);
_bwMainFile.Write(pointsNum);
foreach (ShapeLineString part in polyLine.Parts)
{
_bwMainFile.Write(index);
index += part.Points.Length;
}
foreach (ShapeLineString part in polyLine.Parts)
{
foreach (ShapePoint sp in part.Points)
{
_bwMainFile.Write(sp.X);
_bwMainFile.Write(sp.Y);
}
}
}
_currentShpRecondPosition = _fsMainFile.Position;
_currentShxRecondPosition = _fsShxFile.Position;
}
private void WriteVectorDataToFiles(Feature[] features)
{
byte[] byteArray;
Envelope env = new Envelope(double.MaxValue, double.MaxValue, double.MinValue, double.MinValue);
foreach (Feature vf in features)
{
env.UnionWith(vf.Geometry.Envelope);
}
////write main file
//write main file and shx file header
byteArray = BitConverter.GetBytes(9994);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = new byte[20];
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
////
byteArray = BitConverter.GetBytes(CalculateMainfileLengthInByte(features) / 2);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
byteArray = BitConverter.GetBytes(CalculateShxfileLenthInByte(features) / 2);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
byteArray = BitConverter.GetBytes(1000);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(env.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
_bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = new byte[32];
_bwMainFile.Write(byteArray);
_bwShxFile.Write(byteArray);
//write main file and Shx file records
switch (_shapeType)
{
case enumShapeType.Point:
WriteShapePointRecords(features);
break;
case enumShapeType.MultiPoint:
WriteShapeMultiPointRecords(features);
break;
case enumShapeType.Polyline:
WriteShapePolylineRecords(features);
break;
case enumShapeType.Polygon:
WriteShapePolygonRecords(features);
break;
default:
break;
}
////write prj file,leave it now,no spec
CloseVectorDataFiles();
}
private void WriteShapePolygonRecords(Feature[] vfs)
{
//the fist record offset in 16-bit word
Int32 Offset = 50;
byte[] byteArray;
ShapePolygon polygon;
Int32 contentLength;
Int32 pointsNum = 0;
Int32 index = 0;
for (int i = 0; i < vfs.Length; i++)
{
polygon = vfs[i].Geometry as ShapePolygon;
pointsNum = 0;
index = 0;
contentLength = (44 + polygon.Rings.Length * 4) / 2;
foreach (ShapeRing part in polygon.Rings)
{
contentLength += part.Points.Length * 8;
pointsNum += part.Points.Length;
}
byteArray = BitConverter.GetBytes(i + 1);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
byteArray = BitConverter.GetBytes(Offset);
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
Offset += contentLength + 4;
////
byteArray = BitConverter.GetBytes(contentLength);
_bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
_bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
////
byteArray = BitConverter.GetBytes((int)_shapeType);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MinX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MinY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MaxX);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Envelope.MaxY);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(polygon.Rings.Length);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
byteArray = BitConverter.GetBytes(pointsNum);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
foreach (ShapeRing sr in polygon.Rings)
{
byteArray = BitConverter.GetBytes(index);
_bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
index += sr.Points.Length;
}
foreach (ShapeRing sr in polygon.Rings)
{
foreach (ShapePoint sp in sr.Points)
{
byteArray = BitConverter.GetBytes(sp.X);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
byteArray = BitConverter.GetBytes(sp.Y);
_bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
}
}
}
}