public IShxRecord ReadRecord(int recordIndex)
{
var recordOffset = GetRecordOffset(recordIndex);
var shxRecordField = new ShxRecordField(recordOffset);
return(shxRecordField.Read(BinaryReader));
}
public IShapefileRecord <T> Write(T shape)
{
//TODO: Write BoundingBox merge method(s)...
dynamic shapeBox = shape.Box;
if (BoundingBox == null)
{
BoundingBox = new BoundingBox <PointZ>()
{
Min = new PointZ(shapeBox.Min),
Max = new PointZ(shapeBox.Max)
};
}
else
{
BoundingBox.Min.Minimize(shapeBox.Min);
BoundingBox.Max.Maximize(shapeBox.Max);
}
var shpRecordOffset = WordCount.FromBytes(ShpWriter.BaseStream.Position);
var shpContentOffset = shpRecordOffset + ShpRecordHeaderField.FieldLength;
var record = new ShapefileRecord <T>()
{
RecordNumber = RecordNumber,
Shape = shape
};
//TODO: Write the SHP header first...
// But we have to write the shape, to figure out its length, to add the length to the header...
var shapeField = new ShapeField(shpContentOffset);
shapeField.Write(ShpWriter, shape);
var shpStreamLengthAfterRecordWrite = ShpWriter.BaseStream.Length;
var shpHeader = new ShpRecordHeader()
{
//TODO: The shapeField should just have a Length... vs assuming the writer will be at the correct length...
ContentLength = WordCount.FromBytes(shpStreamLengthAfterRecordWrite) - shpContentOffset,
RecordNumber = RecordNumber
};
var shpHeaderField = new ShpRecordHeaderField(shpRecordOffset);
shpHeaderField.Write(ShpWriter, shpHeader);
//Reset so we are at the correct position for the next shape...
ShpWriter.BaseStream.Position = shpStreamLengthAfterRecordWrite;
var shxRecord = new ShxRecord()
{
Offset = shpRecordOffset,
ContentLength = WordCount.FromBytes((int)ShpWriter.BaseStream.Position) - shpRecordOffset
};
var shxRecordField = new ShxRecordField(WordCount.FromBytes(ShxWriter.BaseStream.Position));
shxRecordField.Write(ShxWriter, shxRecord);
RecordNumber++;
return(record);
}
