C# IGeometryFactory类代码示例

 internal static GeometryLayer CreateFeatureFeatureLayer(IGeometryFactory geoFactory,
                                                         Boolean includeGeometryCollections)
 {
     GeometryLayer layer = new GeometryLayer("TestFeatures",
                                             CreateFeatureDatasource(geoFactory, includeGeometryCollections));
     return layer;
 }

        private static bool TestWktWkb(int number, IGeometryFactory factory, string wkt, string wkb)
        {
            WKTReader r = new WKTReader(factory);
            IGeometry wktGeom = r.Read(wkt);
            WKBReader s = new WKBReader(factory);
            IGeometry wkbGeom = s.Read(WKBReader.HexToBytes(wkb));

            try
            {
                Assert.AreEqual(wkb, WKBWriter.ToHex(wktGeom.AsBinary()), "wkb's don't match");
                Assert.IsTrue(DiscreteHausdorffDistance.Distance(wktGeom, wkbGeom) < 1e-9, number + ": DiscreteHausdorffDistance.Distance(wktGeom, wkbGeom) < 1e-9");
                if (!wktGeom.EqualsExact(wkbGeom))
                {
                    Assert.AreEqual(wkt, wktGeom.AsText(), number + ": wkt.Equals(wktGeom.AsText())");
                    var wktGeom2 = s.Read(wktGeom.AsBinary());
                    Assert.AreEqual(wkt, wktGeom2.AsText(), number + ": wkt.Equals(wktGeom2.AsText())");
                    var diff = wkbGeom.Difference(wktGeom);
                    Assert.IsTrue(false, number + ": wktGeom.EqualsExact(wkbGeom)\n" + diff.AsText());
                }
                return false;
            }
            catch (AssertionException ex)
            {
                Console.WriteLine(ex.Message);
                return true;
            }
        }

		/// <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, System.IO.BinaryWriter file, IGeometryFactory geometryFactory)
		{
            if(!(geometry is IMultiPoint))
                throw new ArgumentException("Geometry Type error: MultiPoint expected, but the type retrieved is " + geometry.GetType().Name);

            // Slow and maybe not useful...
			// if (!geometry.IsValid)
			// 	Trace.WriteLine("Invalid multipoint being written.");

            IMultiPoint mpoint = geometry as IMultiPoint;
            
            file.Write(int.Parse(Enum.Format(typeof(ShapeGeometryTypes), this.ShapeType, "d")));

            IEnvelope box = geometry.EnvelopeInternal;
			IEnvelope bounds = ShapeHandler.GetEnvelopeExternal(geometryFactory.PrecisionModel, box);
			file.Write(bounds.MinX);
			file.Write(bounds.MinY);
			file.Write(bounds.MaxX);
			file.Write(bounds.MaxY);

            int numPoints = mpoint.NumPoints;
			file.Write(numPoints);						

			// write the points 
			for (int i = 0; i < numPoints; i++)
			{
                IPoint point = (IPoint) mpoint.Geometries[i];
                file.Write(point.X);
                file.Write(point.Y);	
			}            
		}

 ///<summary>
 /// Converts a <see cref="GraphicsPath"/> to a Geometry, flattening it first.
 ///</summary>
 /// <param name="shp">The <see cref="GraphicsPath"/></param>
 /// <param name="flatness">The flatness parameter to use</param>
 /// <param name="geomFact">The GeometryFactory to use</param>
 /// <returns>A Geometry representing the shape</returns>
 public static IGeometry Read(GraphicsPath shp, double flatness, IGeometryFactory geomFact)
 {
     var path = (GraphicsPath)shp.Clone();
     path.Flatten(InvertY, (float)flatness);
     var pathIt = new GraphicsPathIterator(path);
     return Read(pathIt, geomFact);
 }

 /// <summary>
 /// Writes to the given stream the equilivent shape file record given a Geometry object.
 /// </summary>
 /// <param name="geometry">The geometry object to write.</param>
 /// <param name="file">The stream to write to.</param>
 /// <param name="geometryFactory">The geometry factory to use.</param>
 public override void Write(IGeometry geometry, System.IO.BinaryWriter file, IGeometryFactory geometryFactory)
 {
     file.Write(int.Parse(Enum.Format(typeof(ShapeGeometryTypes), this.ShapeType, "d")));
     ICoordinate external = geometry.Coordinates[0];
     file.Write(external.X);
     file.Write(external.Y);
 }

        public GraphBuilder2() : this (false) { } // TODO: maybe the default value must be true...

        /// <summary>
        /// Adds each line to the graph structure.
        /// </summary>
        /// <param name="lines"></param>
        /// <returns>
        /// <c>true</c> if all <paramref name="lines">lines</paramref> 
        /// are added, <c>false</c> otherwise.
        /// </returns>
        /// <exception cref="TopologyException">
        /// If geometries don't have the same <see cref="IGeometryFactory">factory</see>.
        /// </exception>
        public bool Add(params ILineString[] lines)
        {
            bool result = true;
            foreach (ILineString line in lines)
            {
                IGeometryFactory newfactory = line.Factory;
                if (factory == null)
                    factory = newfactory;
                else if (!newfactory.PrecisionModel.Equals(factory.PrecisionModel))
                    throw new TopologyException("all geometries must have the same precision model");

                bool lineFound = strings.Contains(line);
                result &= !lineFound;
                if (!lineFound)
                    strings.Add(line);
                else continue; // Skip vertex check because line is already present

                foreach (ICoordinate coord in line.Coordinates)
                {
                    if (!graph.ContainsVertex(coord))
                         graph.AddVertex(coord);
                    
                }
            }
            return result;
        }        

 public ShapefileBlockReader(string path, ShapefileIndexReader index, IGeometryFactory geometryFactory = null, GeometryTransform transform = null, int blockSize = 25)
     : base(path, geometryFactory, transform)
 {
     _block = new int[blockSize, 2];
     _blockPos = blockSize;
     _index = index;
 }

        /// <summary>
        /// Reads a stream and converts the shapefile record to an equilivent geometry object.
        /// </summary>
        /// <param name="file">The stream to read.</param>
        /// <param name="geometryFactory">The geometry factory to use when making the object.</param>
        /// <returns>The Geometry object that represents the shape file record.</returns>
        public override IGeometry Read(BigEndianBinaryReader file, IGeometryFactory geometryFactory)
        {
            int shapeTypeNum = file.ReadInt32();
            type = (ShapeGeometryType) Enum.Parse(typeof (ShapeGeometryType), shapeTypeNum.ToString());
            if (type == ShapeGeometryType.NullShape)
            {
                ICoordinate emptyCoordinate = null;
                return geometryFactory.CreatePoint(emptyCoordinate);
            }

            if (!(type == ShapeGeometryType.Point  || type == ShapeGeometryType.PointM ||
                  type == ShapeGeometryType.PointZ || type == ShapeGeometryType.PointZM))
                throw new ShapefileException("Attempting to load a point as point.");		    

            double x = file.ReadDouble();
            double y = file.ReadDouble();		    
            ICoordinate external = new Coordinate(x,y);			
            geometryFactory.PrecisionModel.MakePrecise(external);
            IPoint point = geometryFactory.CreatePoint(external);
            if (HasZValue() || HasMValue())
            {
                IDictionary<ShapeGeometryType, double> data = new Dictionary<ShapeGeometryType, double>(2);
                if (HasZValue())
                    GetZValue(file, data);
                if (HasMValue())
                    GetMValue(file, data);
                // point.UserData = data;
            }
            return point;
        }

        public DataConverter(IGeometryFactory factory)
        {
            if (factory == null)
                throw new ArgumentNullException("factory");

            _factory = factory;
        }

        /// <summary>
        /// Initializes a new instance of the Shapefile class with the given parameters.
        /// </summary>
        /// <param name="filename">The filename of the shape file to read (with .shp).</param>
        /// <param name="geometryFactory">The GeometryFactory to use when creating Geometry objects.</param>
        public ShapefileReader(string filename, IGeometryFactory geometryFactory)
        {
            Guard.IsNotNull(filename, "filename");
            Guard.IsNotNull(geometryFactory, "geometryFactory");

            _filename = filename;
            _geometryFactory = geometryFactory;

            using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
            {
                // read header information. note, we open the file, read the header information and then
                // close the file. This means the file is not opened again until GetEnumerator() is requested.
                // For each call to GetEnumerator() a new BinaryReader is created.
                using (
                    var stream = new IsolatedStorageFileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read,
                                                               isf))
                {
                    using (var shpBinaryReader = new BigEndianBinaryReader(stream))
                    {
                        _mainHeader = new ShapefileHeader(shpBinaryReader);
                        shpBinaryReader.Close();
                    }
                }
            }
        }

        private void Execute(IGeometryFactory factory)
        {
            const string wkt1 = @"POLYGON ((34.8998882099012 30.3837960942026, 34.9010566737651 30.3644568453302, 34.952062587058 30.3841960548712, 34.9237694926759 30.3379967024143, 34.8688043479468 30.2722872698552, 34.8675239767921 30.2729668362851, 34.8644624659558 30.2746560404891, 34.8614352803289 30.2763912924804, 34.8584433396252 30.2781720660657, 34.8554875530179 30.2799978212197, 34.8525688188649 30.2818680042466, 34.8496880244379 30.2837820479458, 34.8468460456542 30.2857393717817, 34.8440437468117 30.2877393820578, 34.8412819803279 30.2897814720941, 34.8385615864812 30.291865022409, 34.8358833931563 30.2939894009049, 34.8332482155932 30.2961539630577, 34.8306568561393 30.2983580521099, 34.8281101040059 30.3006009992674, 34.8256087350277 30.3028821239005, 34.8231535114263 30.3052007337477, 34.8207451815784 30.3075561251236, 34.8183844797864 30.3099475831299, 34.8160721260548 30.3123743818706, 34.813808825869 30.3148357846692, 34.8115952699799 30.3173310442906, 34.8094321341915 30.3198594031656, 34.8073200791532 30.3224200936183, 34.8052597501567 30.3250123380972, 34.8038593775008 30.3268416420348, 34.8413134524996 30.34133631112, 34.8380456129141 30.3420679436136, 34.8345469119455 30.3429079098264, 34.8310655827664 30.3438006160548, 34.827824169131 30.3446853380141, 34.827602680711 30.3447457917824, 34.8241592556176 30.3457431505854, 34.8207363515157 30.3467923902175, 34.8173350063135 30.3478931927008, 34.8139562514873 30.34904522442, 34.8106011117732 30.3502481362226, 34.80727060486 30.3515015635225, 34.8039657410851 30.3528051264095, 34.8006875231308 30.3541584297621, 34.7974369457248 30.355561063366, 34.8114061852091 30.3793421607384, 34.8098261518056 30.3806388748041, 34.8072325551456 30.3828429255909, 34.8046836035397 30.3850858339783, 34.8021800734927 30.387366919357, 34.7997227278858 30.3896854894863, 34.797312315744 30.3920408407015, 34.7949495720071 30.3944322581256, 34.7926352173053 30.3968590158832, 34.7903699577383 30.3993203773193, 34.7881544846595 30.4018155952199, 34.8175519633847 30.421036532238, 34.8473374156124 30.4405111377535, 34.8473374156124 30.4405111377536, 34.8945946797018 30.4714093282142, 34.89504284421 30.4639917561117, 34.9249010902965 30.4502666241023, 34.9120339400511 30.4239712613602, 34.8990624811609 30.3974627330299, 34.8990624811609 30.3974627330298, 34.8998882099012 30.3837960942026), (34.8998882099012 30.3837960942026, 34.8896581575596 30.3782440174851, 34.8896581575596 30.3782440174851, 34.8998882099012 30.3837960942026))";
            const string wkt2 = @"POLYGON ((34.89504284421 30.4639917561117, 34.8974881525283 30.4235194508906, 34.8362388038152 30.4216169690234, 34.8683403196915 30.4762662772922, 34.89504284421 30.4639917561117))";

            WKTReader reader = new WKTReader(factory);

            IGeometry g1 = reader.Read(wkt1);
            Assert.IsFalse(g1.IsValid);
            IGeometry v1 = g1.Buffer(0);
            Assert.IsTrue(v1.IsValid);

            IGeometry g2 = reader.Read(wkt2);
            //Assert.IsFalse(g2.IsValid);
            IGeometry v2 = g2.Buffer(0);
            Assert.IsTrue(v2.IsValid);

            IGeometry union1 = g1.Union(g2);
            Assert.IsNotNull(union1);
            Assert.IsTrue(union1.IsValid);

            IGeometry union2 = v1.Union(v2);
            Assert.IsNotNull(union2);
            Assert.IsTrue(union2.IsValid);
        }

        public ShapefileDataReader(IStreamProviderRegistry streamProviderRegistry, IGeometryFactory geometryFactory)
        {
            if (streamProviderRegistry==null)
                throw new ArgumentNullException("streamProviderRegistry");
            if (geometryFactory == null)
                throw new ArgumentNullException("geometryFactory");
            _open = true;

            _dbfReader = new DbaseFileReader(streamProviderRegistry);
            _shpReader = new ShapefileReader(streamProviderRegistry, geometryFactory);

            _dbfHeader = _dbfReader.GetHeader();
            _recordCount = _dbfHeader.NumRecords;

            // copy dbase fields to our own array. Insert into the first position, the shape column
            _dbaseFields = new DbaseFieldDescriptor[_dbfHeader.Fields.Length + 1];
            _dbaseFields[0] = DbaseFieldDescriptor.ShapeField();
            for (int i = 0; i < _dbfHeader.Fields.Length; i++)
                _dbaseFields[i + 1] = _dbfHeader.Fields[i];

            _shpHeader = _shpReader.Header;
            _dbfEnumerator = _dbfReader.GetEnumerator();
            _shpEnumerator = _shpReader.GetEnumerator();
            _moreRecords = true;
        }

        /// <summary>
        /// Initializes a new instance of the ShapefileDataReader class.
        /// </summary>
        /// <param name="filename">The shapefile to read (minus the .shp extension)</param>
        ///<param name="geometryFactory">The GeometryFactory to use.</param>
        public ShapefileDataReader(string filename, IGeometryFactory geometryFactory)
        {
            if (filename == null)
                throw new ArgumentNullException("filename");
            if (geometryFactory == null)
                throw new ArgumentNullException("geometryFactory");
            _geometryFactory = geometryFactory;
            _open = true;

            if (filename.ToLower().EndsWith(".shp"))
                filename = filename.ToLower().Replace(".shp",String.Empty);

             _dbfReader = new DbaseFileReader(filename + ".dbf");
             _shpReader = new ShapefileReader(filename + ".shp", geometryFactory);

            _dbfHeader =  _dbfReader.GetHeader();
            _recordCount = _dbfHeader.NumRecords;

            // copy dbase fields to our own array. Insert into the first position, the shape column
            _dbaseFields = new DbaseFieldDescriptor[_dbfHeader.Fields.Length + 1];
            _dbaseFields[0] = DbaseFieldDescriptor.ShapeField();
            for(int i=0; i < _dbfHeader.Fields.Length; i++)
                _dbaseFields[i+1] = _dbfHeader.Fields[i];

            _shpHeader = _shpReader.Header;
            _dbfEnumerator = _dbfReader.GetEnumerator();
            _shpEnumerator = _shpReader.GetEnumerator();
            _moreRecords = true;
        }

        private static void PerformTest(IGeometryFactory factory)
        {
            if (factory == null)
                throw new ArgumentNullException("factory");

            WKTReader reader = new WKTReader(factory);
            IGeometry g1 = reader.Read(t1);
            Assert.IsNotNull(g1);
            Assert.IsTrue(g1.IsValid);
            Assert.IsInstanceOf(typeof(IPolygon), g1);
            Assert.IsInstanceOf(typeof(Polygon), g1);

            IGeometry g2 = reader.Read(t2);
            Assert.IsNotNull(g2);
            Assert.IsTrue(g2.IsValid);
            Assert.IsInstanceOf(typeof(IMultiPolygon), g2);
            Assert.IsInstanceOf(typeof(MultiPolygon), g2);

            Stopwatch watch = new Stopwatch();
            watch.Start();
            IGeometry r = g1.Intersection(g2);
            watch.Stop();
            Assert.IsNotNull(r);
            Assert.IsInstanceOf(typeof(IMultiPolygon), r);
            Assert.IsInstanceOf(typeof(MultiPolygon), r);
            Assert.IsTrue(r.IsValid);
            Console.WriteLine("GeometryFactory.Default => Elapsed: {0}", watch.Elapsed);
        }

        public ShapefileDataReader(string path, IGeometryFactory geometryFactory = null, GeometryTransform transform = null)
            : base(path, geometryFactory, transform)
        {
            _dbf = DbfFile.Open(Path.ChangeExtension(path, ".dbf"));

            _currentRecord = new DbfRecord(_dbf.Header);
        }