private void BuildTreeInMemo()
{
foreach (var recHeader in this._ShxFile.Records)
{
FeatureLite rec = _ShpFile.ReaderShape(recHeader.Offset, recHeader.ContentLength);
_SpatialIndex.Insert(rec.FeatureID, rec.MBR);
}
}
public FeatureLite ReaderShape(int recHeaderPos, int recCLength)
{
using (var stream = MMFCache.GetFileReadItems(_FilePath)
.MMF.CreateViewStream(recHeaderPos, recCLength + HEADER_LENGTH))
{
using (var brReader = new BinaryReader(stream))
{
FeatureLite fl;
int fID = Util.SwapByteOrder(brReader.ReadInt32());
int clength = Util.SwapByteOrder(brReader.ReadInt32());
ShapeType shapeType = (ShapeType)brReader.ReadInt32(); // 4
if (shapeType == ShapeType.Point)
{
fl = new FeatureLite(fID, shapeType
, brReader.ReadDouble(), brReader.ReadDouble());
}
else
{
double xMin = brReader.ReadDouble();
double yMin = brReader.ReadDouble();
double xMax = brReader.ReadDouble();
double yMax = brReader.ReadDouble();// 8*4=32
Envelope mbr = new Envelope(xMin, xMax, yMin, yMax);
var shapeBytes = new byte[clength - 36]; // 4+32=36
brReader.BaseStream.Seek(36, 0);
brReader.Read(shapeBytes, 0, clength - 36);
fl = new FeatureLite(fID, shapeType, mbr, shapeBytes);
}
return(fl);
}
}
}