/// <summary>
/// Writes a Geometry to the given binary wirter.
/// </summary>
/// <param name="geometry">The geometry to write.</param>
/// <param name="file">The file stream to write to.</param>
/// <param name="geometryFactory">The geometry factory to use.</param>
public override void Write(IGeometry geometry, BinaryWriter file, IGeometryFactory geometryFactory)
{
// This check seems to be not useful and slow the operations...
// if (!geometry.IsValid)
// Trace.WriteLine("Invalid polygon being written.");
IGeometryCollection multi;
if (geometry is IGeometryCollection)
multi = (IGeometryCollection) geometry;
else
{
GeometryFactory gf = new GeometryFactory(geometry.PrecisionModel);
multi = gf.CreateMultiPolygon(new IPolygon[] { (IPolygon) geometry, } );
}
file.Write(int.Parse(Enum.Format(typeof(ShapeGeometryType), ShapeType, "d")));
IEnvelope box = multi.EnvelopeInternal;
IEnvelope bounds = GetEnvelopeExternal(geometryFactory.PrecisionModel, box);
file.Write(bounds.MinX);
file.Write(bounds.MinY);
file.Write(bounds.MaxX);
file.Write(bounds.MaxY);
int numParts = GetNumParts(multi);
int numPoints = multi.NumPoints;
file.Write(numParts);
file.Write(numPoints);
// write the offsets to the points
int offset = 0;
for (int part = 0; part < multi.NumGeometries; part++)
{
// offset to the shell points
IPolygon polygon = (IPolygon) multi.Geometries[part];
file.Write(offset);
offset = offset + polygon.ExteriorRing.NumPoints;
// offstes to the holes
foreach (ILinearRing ring in polygon.InteriorRings)
{
file.Write(offset);
offset = offset + ring.NumPoints;
}
}
// write the points
for (int part = 0; part < multi.NumGeometries; part++)
{
IPolygon poly = (IPolygon) multi.Geometries[part];
ICoordinate[] points = poly.ExteriorRing.Coordinates;
WriteCoords(new CoordinateList(points), file, geometryFactory);
foreach(ILinearRing ring in poly.InteriorRings)
{
ICoordinate[] points2 = ring.Coordinates;
WriteCoords(new CoordinateList(points2), file, geometryFactory);
}
}
}
internal static MultiPolygon ToNTSMultiPolygon(Geometries.MultiPolygon multiPolygon,
GeometryFactory factory)
{
Polygon[] polygons = new Polygon[multiPolygon.Polygons.Count];
int index = 0;
foreach (Geometries.Polygon polygon in multiPolygon.Polygons)
polygons[index++] = ToNTSPolygon(polygon, factory);
return factory.CreateMultiPolygon(polygons) as MultiPolygon;
}
