C# BigEndianBinaryReader.ReadDouble方法代碼示例

        /// <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;
        }

        /// <summary>
        /// Reads a stream and converts the shapefile record to an equilivant 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)
                return geometryFactory.CreateMultiPoint(new IPoint[] { });
            
            if (!(type == ShapeGeometryType.MultiPoint  || type == ShapeGeometryType.MultiPointM ||
                  type == ShapeGeometryType.MultiPointZ || type == ShapeGeometryType.MultiPointZM))	
                throw new ShapefileException("Attempting to load a non-multipoint as multipoint.");

            // Read and for now ignore bounds.
            int bblength = GetBoundingBoxLength();
            bbox = new double[bblength];
            for (; bbindex < 4; bbindex++)
            {
                double d = file.ReadDouble();
                bbox[bbindex] = d;
            }

            // Read points
            int numPoints = file.ReadInt32();
            IPoint[] points = new IPoint[numPoints];
            for (int i = 0; i < numPoints; i++)
            {
                double x = file.ReadDouble();
                double y = file.ReadDouble();
                IPoint point = geometryFactory.CreatePoint(new Coordinate(x, y));                
                points[i] = point;
            }
            geom = geometryFactory.CreateMultiPoint(points);
            GrabZMValues(file);
            return geom;
        }        

        /// <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)
                return geometryFactory.CreateMultiLineString(null);

            if (!(type == ShapeGeometryType.LineString  || type == ShapeGeometryType.LineStringM ||
                  type == ShapeGeometryType.LineStringZ || type == ShapeGeometryType.LineStringZM))
                throw new ShapefileException("Attempting to load a non-arc as arc.");

            // Read and for now ignore bounds.            
            int bblength = GetBoundingBoxLength();
            bbox = new double[bblength];
            for (; bbindex < 4; bbindex++)
            {
                double d = file.ReadDouble();
                bbox[bbindex] = 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();
			
            ILineString[] lines = new ILineString[numParts];			
            for (int part = 0; part < numParts; part++)
            {
                int start, finish, length;
                start = partOffsets[part];
                if (part == numParts - 1)
                     finish = numPoints;
                else finish = partOffsets[part + 1];
                length = finish - start;
                CoordinateList points = new CoordinateList();                
                points.Capacity = length;
                for (int i = 0; i < length; i++)
                {
                    double x = file.ReadDouble();
                    double y = file.ReadDouble();
                    ICoordinate external = new Coordinate(x, y);
                    geometryFactory.PrecisionModel.MakePrecise(external);
                    points.Add(external);				    
                }
                ILineString line = geometryFactory.CreateLineString(points.ToArray());
                lines[part] = line;
            }
            geom = geometryFactory.CreateMultiLineString(lines);
            GrabZMValues(file);
            return geom;
        }

		/// <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();
            ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
            if (  ( shapeType == ShapeGeometryTypes.LineString  || shapeType == ShapeGeometryTypes.LineStringM   ||
                     shapeType == ShapeGeometryTypes.LineStringZ || shapeType == ShapeGeometryTypes.LineStringZM  ||
                     shapeType == ShapeGeometryTypes.MultiPatch || shapeType == ShapeGeometryTypes.NullShape ||
                     shapeType == ShapeGeometryTypes.Polygon || shapeType == ShapeGeometryTypes.PolygonM ||
                     shapeType == ShapeGeometryTypes.PolygonZ || shapeType == ShapeGeometryTypes.PolygonZM                                  
                     ))	
				throw new ShapefileException("Attempting to load a non-point shapefile as point.");
			double x= file.ReadDouble();
			double y= file.ReadDouble();
			Coordinate external = new Coordinate(x,y);			
			// return geometryFactory.CreatePoint(geometryFactory.PrecisionModel.ToInternal(external));
            new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
            return geometryFactory.CreatePoint(external);
		}

		/// <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();
            ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
            if( ! ( shapeType == ShapeGeometryTypes.LineString  || shapeType == ShapeGeometryTypes.LineStringM   ||
                    shapeType == ShapeGeometryTypes.LineStringZ || shapeType == ShapeGeometryTypes.LineStringZM  ))
				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();
			
			ILineString[] 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;
                CoordinateList points = new CoordinateList();
				Coordinate external;
				for (int i = 0; i < length; i++)
				{
					external = new Coordinate(file.ReadDouble(),file.ReadDouble());
					// points.Add(geometryFactory.PrecisionModel.ToInternal(external));
                    new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
                    points.Add(external);
				}
				lines[part] = geometryFactory.CreateLineString(points.ToArray());
			}
			return geometryFactory.CreateMultiLineString(lines);
		}

		/// <summary>
		/// Reads a stream and converts the shapefile record to an equilivant 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();
            ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
            if ( ! ( shapeType == ShapeGeometryTypes.MultiPoint  || shapeType == ShapeGeometryTypes.MultiPointM ||
                     shapeType == ShapeGeometryTypes.MultiPointZ || shapeType == ShapeGeometryTypes.MultiPointZM))	
                throw new ShapefileException("Attempting to load a non-multipoint as multipoint.");

            // Read and for now ignore bounds.
            double[] box = new double[4];
            for (int i = 0; i < 4; i++)
                box[i] = file.ReadDouble();

            // Read points
            int numPoints = file.ReadInt32();
            Coordinate[] points = new Coordinate[numPoints];
            for (int i = 0; i < numPoints; i++)
                points[i] = new Coordinate(file.ReadDouble(), file.ReadDouble());
            return geometryFactory.CreateMultiPoint(points);
        }

        public void DoubleTests(Double expectedValue, Byte[] givenBytes)
        {
            // arrange
            var memoryStream = new MemoryStream(givenBytes);
            var binaryReader = new BigEndianBinaryReader(memoryStream);

            // act
            var actualValue = binaryReader.ReadDouble();

            // assert
            Assert.Equal(expectedValue, actualValue);
        }

			internal ConstantPoolItemDouble(BigEndianBinaryReader br)
			{
				d = br.ReadDouble();
			}

        /// <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)
                return geometryFactory.CreatePolygon(null, null);

            if (!(type == ShapeGeometryType.Polygon  || type == ShapeGeometryType.PolygonM ||
                  type == ShapeGeometryType.PolygonZ || type == ShapeGeometryType.PolygonZM))	
                throw new ShapefileException("Attempting to load a non-polygon as polygon.");

            // Read and for now ignore bounds.
            int bblength = GetBoundingBoxLength();
            bbox = new double[bblength];
            for (; bbindex < 4; bbindex++)
            {
                double d = file.ReadDouble();
                bbox[bbindex] = d;
            }
            
            int[] partOffsets;        
            int numParts = file.ReadInt32();
            int numPoints = file.ReadInt32();
            partOffsets = new int[numParts];
            for (int i = 0; i < numParts; i++)
                partOffsets[i] = file.ReadInt32();

            ArrayList shells = new ArrayList();
            ArrayList holes = new ArrayList();

            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;
                CoordinateList points = new CoordinateList();
                points.Capacity = length;
                for (int i = 0; i < length; i++)
                {
                    ICoordinate external = new Coordinate(file.ReadDouble(), file.ReadDouble() );					
                    geometryFactory.PrecisionModel.MakePrecise( external);
                    ICoordinate internalCoord = external;

                    // Thanks to Abhay Menon!
                    if (!Double.IsNaN(internalCoord.Y) && !Double.IsNaN(internalCoord.X))
                        points.Add(internalCoord, false);
                }

                if (points.Count > 2) // Thanks to Abhay Menon!
                {
                    if (points[0].Distance(points[points.Count - 1]) > .00001)
                        points.Add(new Coordinate(points[0]));
                    else if (points[0].Distance(points[points.Count - 1]) > 0.0)
                        points[points.Count - 1].CoordinateValue = points[0];

                    ILinearRing ring = geometryFactory.CreateLinearRing(points.ToArray());

                    // If shape have only a part, jump orientation check and add to shells
                    if (numParts == 1)
                        shells.Add(ring);
                    else
                    {
                        // Orientation check
                        if (CGAlgorithms.IsCCW(points.ToArray()))
                             holes.Add(ring);
                        else shells.Add(ring);
                    }                    
                }
            }

            // Now we have a list of all shells and all holes
            ArrayList holesForShells = new ArrayList(shells.Count);
            for (int i = 0; i < shells.Count; i++)
                holesForShells.Add(new ArrayList());

            // Find holes
            for (int i = 0; i < holes.Count; i++)
            {
                ILinearRing testRing = (ILinearRing) holes[i];
                ILinearRing minShell = null;
                IEnvelope minEnv = null;
                IEnvelope testEnv = testRing.EnvelopeInternal;
                ICoordinate testPt = testRing.GetCoordinateN(0);
                ILinearRing tryRing;
                for (int j = 0; j < shells.Count; j++)
                {
                    tryRing = (ILinearRing) shells[j];
                    IEnvelope tryEnv = tryRing.EnvelopeInternal;
                    if (minShell != null)
                        minEnv = minShell.EnvelopeInternal;
                    bool isContained = false;
//.........這裏部分代碼省略.........

        /// <summary>
        /// Read a double from the stream.<br/>Tracks how many words (1 word = 2 bytes) we have read and than we do not over read.
        /// </summary>
        /// <param name="file">The reader to use</param>
        /// <param name="totalRecordLength">The total number of words (1 word = 2 bytes) this record has</param>
        /// <param name="totalRead">A word counter</param>
        /// <returns>The value read</returns>
        protected double ReadDouble(BigEndianBinaryReader file, int totalRecordLength, ref int totalRead)
        {
            var newRead = totalRead + 4;
            if (newRead > totalRecordLength)
                throw new Exception("End of data encountered while reading double");

            // track how many bytes we have read to know if we have optional values at the end of the record or not
            totalRead = newRead; 
            return file.ReadDouble();
        }

        public void DoubleTests(Double expectedValue, Byte[] givenBytes)
        {
            // arrange
            var binaryReader = new BigEndianBinaryReader(givenBytes);

            // act
            var actualValue = binaryReader.ReadDouble();

            // assert
            Assert.That(expectedValue, Is.EqualTo(actualValue));
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="file"></param>
        protected void GrabZMValues(BigEndianBinaryReader file)
        {
            if (HasZValue() || HasMValue())
            {
                IDictionary<ShapeGeometryType, double>[] datas =
                    new Dictionary<ShapeGeometryType, double>[geom.NumPoints];
                if (HasZValue())
                {
                    bbox[bbindex++] = file.ReadDouble();
                    bbox[bbindex++] = file.ReadDouble();
                    for (int i = 0; i < geom.NumPoints; i++)
                    {
                        if (datas[i] == null)
                            datas[i] = new Dictionary<ShapeGeometryType, double>(2);
                        GetZValue(file, datas[i]);
                    }
                }

                if (HasMValue())
                {
                    bbox[bbindex++] = file.ReadDouble();
                    bbox[bbindex++] = file.ReadDouble();
                    for (int i = 0; i < geom.NumPoints; i++)
                    {
                        if (datas[i] == null)
                            datas[i] = new Dictionary<ShapeGeometryType, double>(2);
                        GetMValue(file, datas[i]);
                    }
                }
                // geom.UserData = datas;
            }
        }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="file"></param>
 /// <param name="data"></param>
 protected void GetMValue(BigEndianBinaryReader file, IDictionary<ShapeGeometryType, double> data)
 {            
     double m = file.ReadDouble();
     // data.Add(ShapeGeometryType.PointM, m);
 }        

		/// <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();
            ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
            if ( ! ( shapeType == ShapeGeometryTypes.Polygon  || shapeType == ShapeGeometryTypes.PolygonM ||
                     shapeType == ShapeGeometryTypes.PolygonZ || shapeType == ShapeGeometryTypes.PolygonZM))	
				throw new ShapefileException("Attempting to load a non-polygon as polygon.");

			// Read and for now ignore bounds.
			double[] box = new double[4];
			for (int i = 0; i < 4; i++) 
				box[i] = file.ReadDouble();

		    int numParts = file.ReadInt32();
			int numPoints = file.ReadInt32();
			int[] partOffsets = new int[numParts];
			for (int i = 0; i < numParts; i++)
				partOffsets[i] = file.ReadInt32();

			ArrayList shells = new ArrayList();
			ArrayList holes = new ArrayList();

		    for (int part = 0; part < numParts; part++)
			{
				int start = partOffsets[part];
			    int finish;
			    if (part == numParts - 1)
					 finish = numPoints;
				else finish = partOffsets[part + 1];
				int length = finish - start;
                CoordinateList points = new CoordinateList();
				for (int i = 0; i < length; i++)
				{
					Coordinate external = new Coordinate(file.ReadDouble(), file.ReadDouble() );					
                    new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
                    Coordinate internalCoord = external;
					points.Add(internalCoord);
				}

				ILinearRing ring = geometryFactory.CreateLinearRing(points.ToArray());
				
                // If shape have only a part, jump orientation check and add to shells
                if (numParts == 1)
                    shells.Add(ring);
                else
                {
                    // Orientation check
                    if (CGAlgorithms.IsCounterClockwise(points.ToArray()))
                        holes.Add(ring);
                    else shells.Add(ring);
                }
			}

			// Now we have a list of all shells and all holes
			ArrayList holesForShells = new ArrayList(shells.Count);
			for (int i = 0; i < shells.Count; i++)
				holesForShells.Add(new ArrayList());
			// Find holes
			for (int i = 0; i < holes.Count; i++)
			{
				LinearRing testRing = (LinearRing) holes[i];
				LinearRing minShell = null;
				IEnvelope minEnv = null;
				IEnvelope testEnv = testRing.EnvelopeInternal;
				Coordinate testPt = testRing.GetCoordinateN(0);
				LinearRing tryRing;
				for (int j = 0; j < shells.Count; j++)
				{
					tryRing = (LinearRing) shells[j];
					IEnvelope tryEnv = tryRing.EnvelopeInternal;
					if (minShell != null) 
						minEnv = minShell.EnvelopeInternal;
					bool isContained = false;
					CoordinateList coordList = new CoordinateList(tryRing.Coordinates);
					if (tryEnv.Contains(testEnv)
                        && (CGAlgorithms.IsPointInRing(testPt, coordList.ToArray()) 
                        || (PointInList(testPt, coordList)))) 				
						isContained = true;

                    // Check if this new containing ring is smaller than the current minimum ring
                    if (isContained)
                    {
                        if (minShell == null || minEnv.Contains(tryEnv))
                            minShell = tryRing;

                        // Suggested by Brian Macomber and added 3/28/2006:
                        // holes were being found but never added to the holesForShells array
                        // so when converted to geometry by the factory, the inner rings were never created.
                        ArrayList holesForThisShell = (ArrayList)holesForShells[j];
                        holesForThisShell.Add(holes[i]);
                    }
				}
			}

//.........這裏部分代碼省略.........

//.........這裏部分代碼省略.........
                         u2 string_index;
                     }
                 */
                 item.ConstantType = ConstantType.String;
                 item.StringIndex = reader.ReadUInt16();
                 break;
             case ConstantType.Integer:
                 /*
                     CONSTANT_Integer_info {
                         u1 tag;
                         u4 bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Integer;
                 item.Integer = reader.ReadInt32();
                 break;
             case ConstantType.Float:
                 /*
                     CONSTANT_Float_info {
                         u1 tag;
                         u4 bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Float;
                 item.Float = reader.ReadSingle();
                 break;
             case ConstantType.Long:
                 /*
                     CONSTANT_Long_info {
                         u1 tag;
                         u4 high_bytes;
                         u4 low_bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Long;
                 item.Long = reader.ReadInt64();
                 // JVM Spec. 4.4.5.
                 // All 8-byte constants take up two entries in the
                 // constant_pool table of the class file. If a
                 // CONSTANT_Long_info or CONSTANT_Double_info structure
                 // is the item in the constant_pool table at index n,
                 // then the next usable item in the pool is located at
                 // index n+2. The constant_pool index n+1 must be valid
                 // but is considered unusable.2
                 // 2 In retrospect, making 8-byte constants take two
                 // constant pool entries was a poor choice.
                 ++i;
                 break;
             case ConstantType.Double:
                 /*
                     CONSTANT_Double_info {
                         u1 tag;
                         u4 high_bytes;
                         u4 low_bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Double;
                 item.Double = reader.ReadDouble();
                 // JVM Spec. 4.4.5.
                 // All 8-byte constants take up two entries in the
                 // constant_pool table of the class file. If a
                 // CONSTANT_Long_info or CONSTANT_Double_info structure
                 // is the item in the constant_pool table at index n,
                 // then the next usable item in the pool is located at
                 // index n+2. The constant_pool index n+1 must be valid
                 // but is considered unusable.2
                 // 2 In retrospect, making 8-byte constants take two
                 // constant pool entries was a poor choice.
                 ++i;
                 break;
             case ConstantType.NameAndType:
                 /*
                     CONSTANT_NameAndType_info {
                         u1 tag;
                         u2 name_index;
                         u2 descriptor_index;
                     }
                 */
                 item.ConstantType = ConstantType.NameAndType;
                 item.NameIndex = reader.ReadUInt16();
                 item.DescriptorIndex = reader.ReadUInt16();
                 break;
             case ConstantType.Utf8:
                 /*
                     CONSTANT_Utf8_info {
                         u1 tag;
                         u2 length;
                         u1 bytes[length];
                     }
                 */
                 item.ConstantType = ConstantType.Utf8;
                 item.String = reader.ReadString(reader.ReadUInt16());
                 break;
             default:
                 throw new ApplicationException("Wrong ConstantType: " +
                     tag);
         }
     }
     return constantPool;
 }