C# GeometryFactory.CreateLinearRing方法代碼示例

		public static void main(string[] args)
		{
			ExtendedCoordinateSequenceFactory seqFact = ExtendedCoordinateSequenceFactory.Instance();
			
			ExtendedCoordinate[] array1 = new ExtendedCoordinate[] { new ExtendedCoordinate(0, 0, 0, 91), 
                new ExtendedCoordinate(10, 0, 0, 92), new ExtendedCoordinate(10, 10, 0, 93), 
                new ExtendedCoordinate(0, 10, 0, 94), new ExtendedCoordinate(0, 0, 0, 91)};
			ICoordinateSequence seq1 = seqFact.Create(array1);
			
			ICoordinateSequence seq2 = seqFact.Create(new ExtendedCoordinate[] { new ExtendedCoordinate(5, 5, 0, 91), 
                new ExtendedCoordinate(15, 5, 0, 92), new ExtendedCoordinate(15, 15, 0, 93), 
                new ExtendedCoordinate(5, 15, 0, 94), new ExtendedCoordinate(5, 5, 0, 91)});
			
			GeometryFactory fact = new GeometryFactory(ExtendedCoordinateSequenceFactory.Instance());

            IGeometry g1 = fact.CreatePolygon(fact.CreateLinearRing(seq1), null);
            IGeometry g2 = fact.CreatePolygon(fact.CreateLinearRing(seq2), null);
			
			Console.WriteLine("WKT for g1: " + g1);
			Console.WriteLine("Internal rep for g1: " + ((IPolygon) g1).ExteriorRing.CoordinateSequence);
			
			Console.WriteLine("WKT for g2: " + g2);
            Console.WriteLine("Internal rep for g2: " + ((IPolygon)g2).ExteriorRing.CoordinateSequence);

            IGeometry gInt = g1.Intersection(g2);
			
			Console.WriteLine("WKT for gInt: " + gInt);
            Console.WriteLine("Internal rep for gInt: " + ((IPolygon)gInt).ExteriorRing.CoordinateSequence);
		}

        private void LoadParcels(List<PointD> pt, Color color, string labelname)
        {
            SharpMap.Map map = new SharpMap.Map();
            List<GeoAPI.Geometries.Coordinate> vertices = new List<GeoAPI.Geometries.Coordinate>();

            foreach (PointD i in pt)
            {
                GeoAPI.Geometries.Coordinate p = new GeoAPI.Geometries.Coordinate();
                p.X = i.X;
                p.Y = i.Y;
                vertices.Add(p);
            }
            GeoAPI.Geometries.Coordinate l = new GeoAPI.Geometries.Coordinate();
            l.X = pt[0].X;
            l.Y = pt[0].Y;
            vertices.Add(l);

            //Collection<GeoAPI.Geometries.IGeometry> geom = new Collection<GeoAPI.Geometries.IGeometry>();

            GeometryFactory gf = new NetTopologySuite.Geometries.GeometryFactory();
            GeoAPI.Geometries.ILinearRing shell = gf.CreateLinearRing(vertices.ToArray());

            GeoAPI.Geometries.IPolygon polygon = gf.CreatePolygon(shell, null);

            SharpMap.Data.Providers.GeometryProvider geomProvider= new SharpMap.Data.Providers.GeometryProvider(polygon);

            SharpMap.Layers.VectorLayer layerParcels = new SharpMap.Layers.VectorLayer("Parcels");

            SharpMap.Styles.VectorStyle style = new SharpMap.Styles.VectorStyle();

            style.Fill = new SolidBrush(Color.FromArgb(200,color));
            style.Outline = new Pen(new SolidBrush(color));

            layerParcels.Style = style;
            layerParcels.Style.EnableOutline = true;

            layerParcels.DataSource = geomProvider;
            layerParcels.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

            mapBox1.ActiveTool = SharpMap.Forms.MapBox.Tools.Pan;

            var fdt = new SharpMap.Data.FeatureDataTable();
            fdt.Columns.Add(new System.Data.DataColumn("id", typeof(uint)));
            fdt.Columns.Add(new System.Data.DataColumn("label", typeof(string)));
            var fdr = (SharpMap.Data.FeatureDataRow)fdt.NewRow();
            fdr.ItemArray = new object[] { 1, labelname };
            fdr.Geometry =  polygon;
            fdt.AddRow(fdr);

            var dataprovider = new SharpMap.Data.Providers.GeometryFeatureProvider(fdt);

            var ll = new SharpMap.Layers.LabelLayer("llayer");
            ll.DataSource = dataprovider;
            ll.LabelColumn = "label";
            ll.Style.Font = new Font("Eurostile Extended", 16,FontStyle.Bold);

            mapBox1.Map.Layers.Add(layerParcels);
            mapBox1.Map.Layers.Add(ll);

            mapBox1.Map.ZoomToExtents();
            mapBox1.Refresh();
        }

 public static IGeometry ToPolygon(Vertex[] v)
 {
     var ringPts = new[]
                       {
                           v[0].Coordinate,
                           v[1].Coordinate,
                           v[2].Coordinate,
                           v[0].Coordinate
                       };
     var fact = new GeometryFactory();
     var ring = fact.CreateLinearRing(ringPts);
     var tri = fact.CreatePolygon(ring, null);
     return tri;
 }

 public IGeometry GetGeometry(GeometryFactory fact)
 {
     ILinearRing ring = fact.CreateLinearRing(GetCoordinates());
     IPolygon tri = fact.CreatePolygon(ring, null);
     return tri;
 }