C# GeometryFactory.CreateLineString方法代码示例

        private MultiLineString CreateMLS1()
        {
            Coordinates coords = new Coordinates();
            Coordinate coord = new Coordinate();
            GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
            LineString lineString = gf.CreateLineString(coords);
            LineString[] ls = new LineString[10];
            int c = 0;
            for(int i = 10; i > 0; i--)
            {
                for(int j = i; j < i+10; j++)
                {
                    coord = new Coordinate();
                    coord.X = (double)j;
                    coord.Y = (double)j+5;
                    coords.Add(coord);
                }
                lineString = gf.CreateLineString(coords);
                ls[c] = lineString;
                c++;
            }
            MultiLineString multiLS = gf.CreateMultiLineString(ls);

            return multiLS;
        }

        private MultiLineString nonSimpleMLS()
        {
            Coordinates coords = new Coordinates();
            Coordinate coord = new Coordinate();
            GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
            LineString lineString = gf.CreateLineString(coords);
            LineString[] ls = new LineString[1];

            coord = new Coordinate(2, 2);
            coords.Add(coord);
            coord = new Coordinate(3, 3);
            coords.Add(coord);
            coord = new Coordinate(4, 4);
            coords.Add(coord);
            coord = new Coordinate(5, 5);
            coords.Add(coord);
            coord = new Coordinate(6, 6);
            coords.Add(coord);
            coord = new Coordinate(7, 7);
            coords.Add(coord);
            coord = new Coordinate(8, 8);
            coords.Add(coord);
            coord = new Coordinate(9, 7);
            coords.Add(coord);
            coord = new Coordinate(10, 6);
            coords.Add(coord);
            coord = new Coordinate(10, 5);
            coords.Add(coord);
            coord = new Coordinate(9, 4);
            coords.Add(coord);
            coord = new Coordinate(8, 3);
            coords.Add(coord);
            coord = new Coordinate(7, 4);
            coords.Add(coord);
            coord = new Coordinate(7, 5);
            coords.Add(coord);
            coord = new Coordinate(6, 6);
            coords.Add(coord);
            coord = new Coordinate(5, 7);
            coords.Add(coord);
            coord = new Coordinate(4, 8);
            coords.Add(coord);
            coord = new Coordinate(3, 9);
            coords.Add(coord);
            ls[0] = gf.CreateLineString(coords);

            MultiLineString multiLS = gf.CreateMultiLineString(ls);

            return multiLS;
        }

        public void test_Geometry()
        {
            LineString[] linestrings = new LineString[2];
            Coordinates coords1 = new Coordinates();
            Coordinate coord = new Coordinate(5,3);
            coords1.Add(coord);
            coord = new Coordinate(4,5);
            coords1.Add(coord);
            coord = new Coordinate(3,4);
            coords1.Add(coord);

            GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
            LineString ls = gf.CreateLineString(coords1);
            linestrings[0] = ls;

            Coordinates coords2 = new Coordinates();
            coord = new Coordinate(2,7);
            coords2.Add(coord);
            coord = new Coordinate(9,2);
            coords2.Add(coord);
            coord = new Coordinate(7,9);
            coords2.Add(coord);

            ls = gf.CreateLineString(coords2);
            linestrings[1] = ls;

            MultiLineString mls = gf.CreateMultiLineString(linestrings);

            Assertion.AssertEquals("Geometry-1: ", "LineString:(5, 3, NaN),(4, 5, NaN),(3, 4, NaN)", mls.GetGeometryN(0).ToString());
            Assertion.AssertEquals("Geometry-2: ", "LineString:(2, 7, NaN),(9, 2, NaN),(7, 9, NaN)", mls.GetGeometryN(1).ToString());
        }

        private MultiLineString closedMLS()
        {
            Coordinates coords = new Coordinates();
            Coordinate coord = new Coordinate();
            GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
            LineString lineString = gf.CreateLineString(coords);
            LineString[] ls = new LineString[2];

            coord = new Coordinate(10, 13);
            coords.Add(coord);
            coord = new Coordinate(11, 13);
            coords.Add(coord);
            coord = new Coordinate(12, 13);
            coords.Add(coord);
            coord = new Coordinate(13, 14);
            coords.Add(coord);
            coord = new Coordinate(14, 15);
            coords.Add(coord);
            coord = new Coordinate(15, 16);
            coords.Add(coord);
            coord = new Coordinate(15, 17);
            coords.Add(coord);
            coord = new Coordinate(15, 18);
            coords.Add(coord);
            coord = new Coordinate(14, 19);
            coords.Add(coord);
            coord = new Coordinate(13, 20);
            coords.Add(coord);
            coord = new Coordinate(12, 21);
            coords.Add(coord);
            coord = new Coordinate(11, 21);
            coords.Add(coord);
            coord = new Coordinate(10, 21);
            coords.Add(coord);
            coord = new Coordinate(9, 20);
            coords.Add(coord);
            coord = new Coordinate(8, 19);
            coords.Add(coord);
            coord = new Coordinate(7, 18);
            coords.Add(coord);
            coord = new Coordinate(7, 17);
            coords.Add(coord);
            coord = new Coordinate(7, 16);
            coords.Add(coord);
            coord = new Coordinate(8, 15);
            coords.Add(coord);
            coord = new Coordinate(9, 14);
            coords.Add(coord);
            coord = new Coordinate(10, 13);
            coords.Add(coord);
            ls[0] = gf.CreateLineString(coords);

            coords = new Coordinates();
            coord = new Coordinate(5, 1);
            coords.Add(coord);
            coord = new Coordinate(6, 2);
            coords.Add(coord);
            coord = new Coordinate(7, 3);
            coords.Add(coord);
            coord = new Coordinate(6, 4);
            coords.Add(coord);
            coord = new Coordinate(5, 5);
            coords.Add(coord);
            coord = new Coordinate(4, 4);
            coords.Add(coord);
            coord = new Coordinate(3, 3);
            coords.Add(coord);
            coord = new Coordinate(4, 2);
            coords.Add(coord);
            coord = new Coordinate(5, 1);
            coords.Add(coord);
            ls[1] = gf.CreateLineString(coords);

            MultiLineString multiLS = gf.CreateMultiLineString(ls);

            return multiLS;
        }

		/// <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 Geometry Read(BigEndianBinaryReader file, GeometryFactory geometryFactory)
		{
			int shapeTypeNum = file.ReadInt32();
			ShapeType shapeType = (ShapeType)Enum.Parse(typeof(ShapeType),shapeTypeNum.ToString());
			if (shapeType != ShapeType.Arc)
			{
				throw new ShapefileException("Attempting to load a non-arc as arc.");
			}
			//read and for now ignore bounds.
			double[] box = new double[4];
			for (int i = 0; i < 4; i++) 
			{
				double d= file.ReadDouble();
				box[i] =d;
			}


        
			int numParts = file.ReadInt32();
			int numPoints = file.ReadInt32();
			int[] partOffsets = new int[numParts];
			for (int i = 0; i < numParts; i++)
			{
				partOffsets[i] = file.ReadInt32();
			}
			
			LineString[] lines = new LineString[numParts];
			int start, finish, length;
			for (int part = 0; part < numParts; part++)
			{
				start = partOffsets[part];
				if (part == numParts - 1)
				{
					finish = numPoints;
				}
				else 
				{
					finish = partOffsets[part + 1];
				}
				length = finish - start;
				Coordinates points = new Coordinates();
				points.Capacity=length;
				Coordinate external;
				for (int i = 0; i < length; i++)
				{
					external = new Coordinate(file.ReadDouble(),file.ReadDouble());
					points.Add( geometryFactory.PrecisionModel.ToInternal(external));
				}
				lines[part] = geometryFactory.CreateLineString(points);

			}
			return geometryFactory.CreateMultiLineString(lines);
		}

        private GeometryCollection CreateCollection3()
        {
            //create a new geometries array
            Geometry[] geom = new Geometry[10];

            Coordinate coordinate = new Coordinate();
            Coordinates coords = new Coordinates();
            GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
            Point point = gf.CreatePoint(coordinate);

            LineString lineString = gf.CreateLineString(coords);

            for(int c = 0; c < 5; c++)
            {
                for(int i = c; i < c+5; i++)
                {
                    //if this isn't here the coordinates for all the points are reset every time the coordinate is reset
                    coordinate = new Coordinate();
                    //make the x coordinate equal to the iterator
                    coordinate.X = (double)i;
                    //make the y coordinate equal to the iterator plus 10
                    coordinate.Y = (double)i + 10;
                    coords.Add(coordinate);
                }
                lineString = gf.CreateLineString(coords);
                geom[c] = lineString;
            }
            for(int i = 5; i < 10; i++)
            {
                //if this isn't here the coordinates for all the points are reset every time the coordinate is reset
                coordinate = new Coordinate();
                //make the x coordinate equal to the iterator
                coordinate.X = (double)i;
                //make the y coordinate equal to the iterator plus 10
                coordinate.Y = (double)i + 10;
                //create a new point to put in the geometry
                point = gf.CreatePoint(coordinate);
                //put the point in the geometies
                geom[i] = point;
            }
            //put the geometries into a geometry collection
            GeometryCollection geoColl = gf.CreateGeometryCollection(geom);

            return geoColl;
        }

		public void test_ToString()
		{
			Coordinates coords = new Coordinates();
			Coordinate coord = new Coordinate(1.0, 2.0);
			coords.Add(coord);
			coord = new Coordinate(3.0, 4.0);
			coords.Add(coord);
			
			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls1 = gf.CreateLineString(coords);
			Assertion.AssertEquals("ToString-1: ", "LineString:(1, 2, NaN),(3, 4, NaN)", ls1.ToString());

			coord = new Coordinate(2.4, 4.9);
			coords.Add(coord);
			LineString ls2 = gf.CreateLineString(coords);
			Assertion.AssertEquals("ToString-2: ", "LineString:(1, 2, NaN),(3, 4, NaN),(2.4, 4.9, NaN)", ls2.ToString());

			coord = new Coordinate(1.0, 1.0);
			coords.Add(coord);
			LineString ls3 = gf.CreateLineString(coords);
			Assertion.AssertEquals("ToString-3: ", "LineString:(1, 2, NaN),(3, 4, NaN),(2.4, 4.9, NaN),(1, 1, NaN)", ls3.ToString());
		}

		/// <summary>
		/// Method to create a Simple NonClosed Linestring for testing purposes
		/// </summary>
		/// <returns>A lineString</returns>
		private LineString SimpleOpen()
		{
			_coords = new Coordinates();
			Coordinate coord = new Coordinate(0.0,0.0);
			for(int i = 1; i < 12; i++)
			{
				coord = new Coordinate((double)i, (double)i);
				_coords.Add(coord);
			}
			coord = new Coordinate(11, 12);
			_coords.Add(coord);
			coord = new Coordinate(10, 13);
			_coords.Add(coord);
			coord = new Coordinate(9, 14);
			_coords.Add(coord);
			coord = new Coordinate(8, 15);
			_coords.Add(coord);
			coord = new Coordinate(9, 16);
			_coords.Add(coord);
			coord = new Coordinate(10, 17);
			_coords.Add(coord);
			coord = new Coordinate(11, 18);
			_coords.Add(coord);
			coord = new Coordinate(12, 19);
			_coords.Add(coord);
			coord = new Coordinate(11, 20);
			_coords.Add(coord);
			coord = new Coordinate(10, 21);
			_coords.Add(coord);
			coord = new Coordinate(9, 22);
			_coords.Add(coord);

			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(_coords);
			return ls;
		}

		public void test_IsEmpty()
		{
			Coordinates coords = new Coordinates();
			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(coords);
			Assertion.AssertEquals("IsEmpty-1: ", true, ls.IsEmpty());
			ls = SimpleOpen();
			Assertion.AssertEquals("IsEmpty-2: ", false, ls.IsEmpty());
		}

		public void test_NumPoints()
		{
			LineString ls1 = SimpleOpen();
			LineString ls2 = NonSimpleOpen();
			LineString ls3 = SimpleClosed();
			LineString ls4 = NonSimpleClosed();
			Coordinates testCoords = new Coordinates();
			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls5 = gf.CreateLineString(testCoords);

			Assertion.AssertEquals("NumPoints-1: ", 22, ls1.GetNumPoints());
			Assertion.AssertEquals("NumPoints-2: ", 18, ls2.GetNumPoints());
			Assertion.AssertEquals("NumPoints-3: ", 21, ls3.GetNumPoints());
			Assertion.AssertEquals("NumPoints-4: ", 32, ls4.GetNumPoints());
			Assertion.AssertEquals("NumPoints-5: ", 0, ls5.GetNumPoints());
		}

		public void test_Envelope()
		{
			LineString ls = SimpleOpen();

			//put the envelope into a geometry
			Geometry geom = ls.GetEnvelope() as Geometry;

			//make sure there is something in the geometry
			Assertion.AssertEquals("Envelope-1: ", false, geom.IsEmpty());
            
			//get the coordinates out of the geometry
			Coordinates coords = geom.GetCoordinates();

			//check the first set of coordinates (minX, minY)
			Assertion.AssertEquals("Envelope-2: ", 1.0, coords[0].X);
			Assertion.AssertEquals("Envelope-3: ", 1.0, coords[0].Y);

			//check the second set of coordinates (maxX, minY)
			Assertion.AssertEquals("Envelope-4: ", 12.0, coords[1].X);
			Assertion.AssertEquals("Envelope-5: ", 1.0, coords[1].Y);

			//check the third set of coordinates (maxX, maxY)
			Assertion.AssertEquals("Envelope-6: ", 12.0, coords[2].X);
			Assertion.AssertEquals("Envelope-7: ", 22.0, coords[2].Y);

			//check the forth set of coordinates (minX, maxY)
			Assertion.AssertEquals("Envelope-8: ", 1.0, coords[3].X);
			Assertion.AssertEquals("Envelope-9: ", 22.0, coords[3].Y);

			//check the fifth set of coordinates (minX, minY)
			Assertion.AssertEquals("Envelope-10: ", 1.0, coords[4].X);
			Assertion.AssertEquals("Envelope-11: ", 1.0, coords[4].Y);

			Coordinates coords2 = new Coordinates();
			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls2 = gf.CreateLineString(coords2);
			geom = ls2.GetEnvelope() as Geometry;

			//make sure there is nothing in the geometry
			Assertion.AssertEquals("Envelope-12: ", true, geom.IsEmpty());
		}

		private LineString ThrowsException()
		{
			Coordinates coords = new Coordinates();

			Coordinate coord = new Coordinate(1,1);
			coords.Add(coord);

			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(coords);

			return ls;
		}

		/// <summary>
		/// Method to create a NonSimple Closed Linestring for testing purposes
		/// </summary>
		/// <returns>A lineString</returns>
		private LineString NonSimpleClosed()
		{
			Coordinates coords = new Coordinates();
			Coordinate coord = new Coordinate(0, 0);

			coord = new Coordinate(2, 2);
			coords.Add(coord);
			coord = new Coordinate(3, 1);
			coords.Add(coord);
			coord = new Coordinate(4, 2);
			coords.Add(coord);
			coord = new Coordinate(5, 3);
			coords.Add(coord);
			coord = new Coordinate(6, 4);
			coords.Add(coord);
			coord = new Coordinate(7, 5);
			coords.Add(coord);
			coord = new Coordinate(7, 6);
			coords.Add(coord);
			coord = new Coordinate(7, 7);
			coords.Add(coord);
			coord = new Coordinate(7, 8);
			coords.Add(coord);
			coord = new Coordinate(7, 9);
			coords.Add(coord);
			coord = new Coordinate(6, 10);
			coords.Add(coord);
			coord = new Coordinate(5, 11);
			coords.Add(coord);
			coord = new Coordinate(6, 12);
			coords.Add(coord);
			coord = new Coordinate(7, 13);
			coords.Add(coord);
			coord = new Coordinate(8, 14);
			coords.Add(coord);
			coord = new Coordinate(9, 13);
			coords.Add(coord);
			coord = new Coordinate(10, 12);
			coords.Add(coord);
			coord = new Coordinate(10, 11);
			coords.Add(coord);
			coord = new Coordinate(10, 10);
			coords.Add(coord);
			coord = new Coordinate(10, 9);
			coords.Add(coord);
			coord = new Coordinate(9, 8);
			coords.Add(coord);
			coord = new Coordinate(8, 7);
			coords.Add(coord);
			coord = new Coordinate(7, 7);
			coords.Add(coord);
			coord = new Coordinate(6, 7);
			coords.Add(coord);
			coord = new Coordinate(5, 8);
			coords.Add(coord);
			coord = new Coordinate(4, 8);
			coords.Add(coord);
			coord = new Coordinate(3, 7);
			coords.Add(coord);
			coord = new Coordinate(2, 6);
			coords.Add(coord);
			coord = new Coordinate(1, 5);
			coords.Add(coord);
			coord = new Coordinate(2, 4);
			coords.Add(coord);
			coord = new Coordinate(1, 3);
			coords.Add(coord);
			coord = new Coordinate(2, 2);
			coords.Add(coord);

			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(coords);
			return ls;
		}

		/// <summary>
		/// Method to create a Simple Closed Linestring for testing purposes
		/// </summary>
		/// <returns>A lineString</returns>
		private LineString SimpleClosed()
		{
			Coordinates coords = new Coordinates();
			Coordinate coord ;//Coordinate(0, 0);

			coord = new Coordinate(10, 13);
			coords.Add(coord);
			coord = new Coordinate(11, 13);
			coords.Add(coord);
			coord = new Coordinate(12, 13);
			coords.Add(coord);
			coord = new Coordinate(13, 14);
			coords.Add(coord);
			coord = new Coordinate(14, 15);
			coords.Add(coord);
			coord = new Coordinate(15, 16);
			coords.Add(coord);
			coord = new Coordinate(15, 17);
			coords.Add(coord);
			coord = new Coordinate(15, 18);
			coords.Add(coord);
			coord = new Coordinate(14, 19);
			coords.Add(coord);
			coord = new Coordinate(13, 20);
			coords.Add(coord);
			coord = new Coordinate(12, 21);
			coords.Add(coord);
			coord = new Coordinate(11, 21);
			coords.Add(coord);
			coord = new Coordinate(10, 21);
			coords.Add(coord);
			coord = new Coordinate(9, 20);
			coords.Add(coord);
			coord = new Coordinate(8, 19);
			coords.Add(coord);
			coord = new Coordinate(7, 18);
			coords.Add(coord);
			coord = new Coordinate(7, 17);
			coords.Add(coord);
			coord = new Coordinate(7, 16);
			coords.Add(coord);
			coord = new Coordinate(8, 15);
			coords.Add(coord);
			coord = new Coordinate(9, 14);
			coords.Add(coord);
			coord = new Coordinate(10, 13);
			coords.Add(coord);

			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(coords);
			return ls;
		}

		/// <summary>
		/// Method to create a NonSimple NonClosed Linestring for testing purposes
		/// </summary>
		/// <returns>A lineString</returns>
		private LineString NonSimpleOpen()
		{
			Coordinates coords = new Coordinates();
			Coordinate coord = new Coordinate(0, 0);

			coord = new Coordinate(2, 2);
			coords.Add(coord);
			coord = new Coordinate(3, 3);
			coords.Add(coord);
			coord = new Coordinate(4, 4);
			coords.Add(coord);
			coord = new Coordinate(5, 5);
			coords.Add(coord);
			coord = new Coordinate(6, 6);
			coords.Add(coord);
			coord = new Coordinate(7, 7);
			coords.Add(coord);
			coord = new Coordinate(8, 8);
			coords.Add(coord);
			coord = new Coordinate(9, 7);
			coords.Add(coord);
			coord = new Coordinate(10, 6);
			coords.Add(coord);
			coord = new Coordinate(10, 5);
			coords.Add(coord);
			coord = new Coordinate(9, 4);
			coords.Add(coord);
			coord = new Coordinate(8, 3);
			coords.Add(coord);
			coord = new Coordinate(7, 4);
			coords.Add(coord);
			coord = new Coordinate(7, 5);
			coords.Add(coord);
			coord = new Coordinate(6, 6);
			coords.Add(coord);
			coord = new Coordinate(5, 7);
			coords.Add(coord);
			coord = new Coordinate(4, 8);
			coords.Add(coord);
			coord = new Coordinate(3, 9);
			coords.Add(coord);

			GeometryFactory gf = new GeometryFactory(_precMod, _sRID);
			LineString ls = gf.CreateLineString(coords);
			return ls;
		}