private static XElement ToKmlPolygon(this Polygon geometry, double?z, XElement[] extraElements)
{
return(new XElement(ns + "MultiGeometry",
geometry.GroupRings().Select(p => new XElement(ns + "Polygon", extraElements,
p.Select(r => new XElement(ns + (r.IsClockwise() ? "innerBoundaryIs" : "outerBoundaryIs"),
new XElement(ns + "LinearRing",
new XElement(ns + "coordinates", r.ToCoordinates(z)))))))));
}
internal static string ToWkt(this Polygon polygon)
{
if (polygon == null)
{
return(null);
}
if (polygon.rings == null || polygon.rings.Length == 0)
{
return("MULTIPOLYGON EMPTY");
}
return($"MULTIPOLYGON({string.Join(",", polygon.GroupRings().Select(p => $"({string.Join(",", p.Select(r => $"({string.Join(",", r.Select(c => $"{c[0]} {c[1]}"))})"))})"))})");
}