internal static SharpMap.Geometries.Polygon ToSharpMapPolygon(GisSharpBlog.NetTopologySuite.Geometries.Polygon polygon)
{
SharpMap.Geometries.LinearRing exteriorRing = ToSharpMapLinearRing((GisSharpBlog.NetTopologySuite.Geometries.LinearRing)polygon.ExteriorRing);
Collection <SharpMap.Geometries.LinearRing> interiorRings = new Collection <SharpMap.Geometries.LinearRing>();
foreach (GisSharpBlog.NetTopologySuite.Geometries.LineString interiorRing in polygon.InteriorRings)
{
interiorRings.Add(ToSharpMapLinearRing((GisSharpBlog.NetTopologySuite.Geometries.LinearRing)interiorRing));
}
return(new SharpMap.Geometries.Polygon(exteriorRing, interiorRings));
}
internal static GisSharpBlog.NetTopologySuite.Geometries.MultiPolygon ToNTSMultiPolygon(SharpMap.Geometries.MultiPolygon multiPolygon,
GisSharpBlog.NetTopologySuite.Geometries.GeometryFactory factory)
{
GisSharpBlog.NetTopologySuite.Geometries.Polygon[] polygons = new GisSharpBlog.NetTopologySuite.Geometries.Polygon[multiPolygon.Polygons.Count];
int index = 0;
foreach (SharpMap.Geometries.Polygon polygon in multiPolygon.Polygons)
{
polygons[index++] = ToNTSPolygon(polygon, factory);
}
return(factory.CreateMultiPolygon(polygons) as GisSharpBlog.NetTopologySuite.Geometries.MultiPolygon);
}
internal static GisSharpBlog.NetTopologySuite.Geometries.MultiPolygon ToNTSMultiPolygon(SharpMap.Geometries.MultiPolygon multiPolygon,
GisSharpBlog.NetTopologySuite.Geometries.GeometryFactory factory)
{
GisSharpBlog.NetTopologySuite.Geometries.Polygon[] polygons = new GisSharpBlog.NetTopologySuite.Geometries.Polygon[multiPolygon.Polygons.Count];
int index = 0;
foreach (SharpMap.Geometries.Polygon polygon in multiPolygon.Polygons)
polygons[index++] = ToNTSPolygon(polygon, factory);
return factory.CreateMultiPolygon(polygons);
}
public static GeoAPI.Geometries.IMultiPolygon ConvertTo(ESRI.ArcGIS.Geometry.IPolygon4 polygon)
{
GisSharpBlog.NetTopologySuite.Geometries.MultiPolygon output = null;
List <GeoAPI.Geometries.IPolygon> list = new List <GeoAPI.Geometries.IPolygon>();
//IPolygon4.ExteriorRingBag should be used instead of IPolygon.QueryExteriorRings,
//which does not work in .NET because of C-Style Arrays
IGeometryBag exteriorRings = polygon.ExteriorRingBag;
//For each exterior rings find the number of interior rings associated with it and print it
IEnumGeometry exteriorRingsEnum = exteriorRings as IEnumGeometry;
exteriorRingsEnum.Reset();
IRing currentExteriorRing = exteriorRingsEnum.Next() as IRing;
while (currentExteriorRing != null)
{
GeoAPI.Geometries.ILinearRing shell = ConvertTo(currentExteriorRing);
List <GeoAPI.Geometries.ILinearRing> holes = null;
//IPolygon4.get_InteriorRingBag should be used instead of IPolygon.QueryInteriorRings,
//which does not work in .NET because of C-Style Arrays
IGeometryBag interiorRings = polygon.get_InteriorRingBag(currentExteriorRing);
IGeometryCollection interiorRingCollection = interiorRings as IGeometryCollection;
if (interiorRingCollection != null && interiorRingCollection.GeometryCount > 0)
{
holes = new List <GeoAPI.Geometries.ILinearRing>();
int interiorRingsTotal = interiorRingCollection.GeometryCount;
for (int interiorRingIndex = 0; interiorRingIndex < interiorRingsTotal; interiorRingIndex++)
{
IRing currentInteriorRing = interiorRingCollection.get_Geometry(interiorRingIndex) as IRing;
if (currentInteriorRing != null)
{
holes.Add(ConvertTo(currentInteriorRing));
}
}
////Note we do nothing with the interiorRings, but you can use them the same way as the IGeometryBag exteriorRings
//IRing currentInteriorRing = exteriorRingsEnum.Next() as IRing;
//while (currentInteriorRing != null)
//{
// holes.Add(ConvertTo(currentInteriorRing));
// currentInteriorRing = exteriorRingsEnum.Next() as IRing;
//}
}
GeoAPI.Geometries.IPolygon entry;
if (holes != null && holes.Count > 0)
{
entry = new GisSharpBlog.NetTopologySuite.Geometries.Polygon(shell, holes.ToArray());
}
else
{
entry = new GisSharpBlog.NetTopologySuite.Geometries.Polygon(shell, null);
}
list.Add(entry);
currentExteriorRing = exteriorRingsEnum.Next() as IRing;
}
if (list != null && list.Count > 0)
{
output = new GisSharpBlog.NetTopologySuite.Geometries.MultiPolygon(list.ToArray());
}
return(output);
}
