Ejemplo n.º 1
0
        // X Y MultiPoints: Total Length = 28 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 8        Integer     1           Little
        // Byte 12      Xmin                Double      1           Little
        // Byte 20      Ymin                Double      1           Little
        // Byte 28      Xmax                Double      1           Little
        // Byte 36      Ymax                Double      1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little

        // X Y M MultiPoints: Total Length = 34 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 28       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y*      Mmin                Double      1           Little
        // Byte Y + 8*  Mmax                Double      1           Little
        // Byte Y + 16* Marray              Double      NumPoints   Little

        // X Y Z M MultiPoints: Total Length = 44 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number  Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 18       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y       Zmin                Double      1           Little
        // Byte Y + 8   Zmax                Double      1           Little
        // Byte Y + 16  Zarray              Double      NumPoints   Little
        // Byte Z*      Mmin                Double      1           Little
        // Byte Z+8*    Mmax                Double      1           Little
        // Byte Z+16*   Marray              Double      NumPoints   Little

        private void FillPoints(string fileName, IProgressHandler progressHandler)
        {
            // Check to ensure the fileName is not null
            if (fileName == null)
            {
                throw new NullReferenceException(DataStrings.ArgumentNull_S.Replace("%S", fileName));
            }

            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(DataStrings.FileNotFound_S.Replace("%S", fileName));
            }

            // Get the basic header information.
            ShapefileHeader header = new ShapefileHeader(fileName);
            Extent = new Extent(new[] { header.Xmin, header.Ymin, header.Xmax, header.Ymax });
            // Check to ensure that the fileName is the correct shape type
            if (header.ShapeType != ShapeType.MultiPoint &&
                 header.ShapeType != ShapeType.MultiPointM &&
                 header.ShapeType != ShapeType.MultiPointZ)
            {
                throw new ArgumentException(DataStrings.FileNotLines_S.Replace("%S", fileName));
            }

            // Reading the headers gives us an easier way to track the number of shapes and their overall length etc.
            List<ShapeHeader> shapeHeaders = ReadIndexFile(fileName);

            // This will set up a reader so that we can read values in huge chunks, which is much faster than one value at a time.
            BufferedBinaryReader bbReader = new BufferedBinaryReader(fileName, progressHandler);

            if (bbReader.FileLength == 100)
            {
                // The shapefile is empty so we can simply return here
                bbReader.Close();
                return;
            }

            // Skip the shapefile header by skipping the first 100 bytes in the shapefile
            bbReader.Seek(100, SeekOrigin.Begin);

            int numShapes = shapeHeaders.Count;

            byte[] bigEndians = new byte[numShapes * 8];
            byte[] allBounds = new byte[numShapes * 32];

            ByteBlock allCoords = new ByteBlock(BLOCKSIZE);
            bool isM = (header.ShapeType == ShapeType.MultiPointZ || header.ShapeType == ShapeType.MultiPointM);
            bool isZ = (header.ShapeType == ShapeType.PolyLineZ);
            ByteBlock allZ = null;
            ByteBlock allM = null;
            if (isZ)
            {
                allZ = new ByteBlock(BLOCKSIZE);
            }
            if (isM)
            {
                allM = new ByteBlock(BLOCKSIZE);
            }
            int pointOffset = 0;
            for (int shp = 0; shp < numShapes; shp++)
            {
                // Read from the index file because some deleted records
                // might still exist in the .shp file.
                long offset = (shapeHeaders[shp].ByteOffset);
                bbReader.Seek(offset, SeekOrigin.Begin);

                // time: 200 ms
                ShapeRange shape = new ShapeRange(FeatureType.MultiPoint)
                                   {
                                       RecordNumber = bbReader.ReadInt32(false),
                                       ContentLength = bbReader.ReadInt32(false),
                                       ShapeType = (ShapeType)bbReader.ReadInt32(),
                                       StartIndex = pointOffset
                                   };

                //bbReader.Read(bigEndians, shp * 8, 8);
                if (shape.ShapeType == ShapeType.NullShape)
                {
                    continue;
                }
                bbReader.Read(allBounds, shp * 32, 32);
                shape.NumParts = 1;
                shape.NumPoints = bbReader.ReadInt32();
                allCoords.Read(shape.NumPoints * 16, bbReader);
                pointOffset += shape.NumPoints;

                if (header.ShapeType == ShapeType.MultiPointM)
                {
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (shape.ContentLength * 2 > 44 + 4 * shape.NumParts + 16 * shape.NumPoints)
                    {
                        IExtentM mExt = (IExtentM)MyExtent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null) allM.Read(shape.NumPoints * 8, bbReader);
                    }
                }
                if (header.ShapeType == ShapeType.MultiPointZ)
                {
                    bool hasM = shape.ContentLength * 2 > 60 + 4 * shape.NumParts + 24 * shape.NumPoints;
                    IExtentZ zExt = (IExtentZ)MyExtent;
                    zExt.MinZ = bbReader.ReadDouble();
                    zExt.MaxZ = bbReader.ReadDouble();
                    // For Z shapefiles, the Z part is not optional.
                    if (allZ != null) allZ.Read(shape.NumPoints * 8, bbReader);

                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (hasM)
                    {
                        IExtentM mExt = (IExtentM)MyExtent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null) allM.Read(shape.NumPoints * 8, bbReader);
                    }
                }
                // Now that we have read all the values, create the geometries from the points and parts arrays.
                ShapeIndices.Add(shape);
            }
            double[] vert = allCoords.ToDoubleArray();
            Vertex = vert;
            if (isM) M = allM.ToDoubleArray();
            if (isZ) Z = allZ.ToDoubleArray();
            Array.Reverse(bigEndians);
            List<ShapeRange> shapes = ShapeIndices;
            double[] bounds = new double[numShapes * 4];
            Buffer.BlockCopy(allBounds, 0, bounds, 0, allBounds.Length);
            for (int shp = 0; shp < numShapes; shp++)
            {
                ShapeRange shape = shapes[shp];
                shape.Extent = new Extent(bounds, shp * 4);
                int endIndex = shape.NumPoints + shape.StartIndex;
                int startIndex = shape.StartIndex;
                int count = endIndex - startIndex;
                PartRange partR = new PartRange(vert, shape.StartIndex, 0, FeatureType.MultiPoint) { NumVertices = count };
                shape.Parts.Add(partR);
            }

            bbReader.Dispose();
        }
Ejemplo n.º 2
0
        // X Y Poly Lines: Total Length = 28 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 3        Integer     1           Little
        // Byte 12      Xmin                Double      1           Little
        // Byte 20      Ymin                Double      1           Little
        // Byte 28      Xmax                Double      1           Little
        // Byte 36      Ymax                Double      1           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little

        // X Y M Poly Lines: Total Length = 34 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 23       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y*      Mmin                Double      1           Little
        // Byte Y + 8*  Mmax                Double      1           Little
        // Byte Y + 16* Marray              Double      NumPoints   Little

        // X Y Z M Poly Lines: Total Length = 44 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number  Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 13       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y       Zmin                Double      1           Little
        // Byte Y + 8   Zmax                Double      1           Little
        // Byte Y + 16  Zarray              Double      NumPoints   Little
        // Byte Z*      Mmin                Double      1           Little
        // Byte Z+8*    Mmax                Double      1           Little
        // Byte Z+16*   Marray              Double      NumPoints   Little

        private void FillPolygons(string fileName, IProgressHandler progressHandler)
        {
            // Check to ensure the fileName is not null
            if (fileName == null)
            {
                throw new NullReferenceException(DataStrings.ArgumentNull_S.Replace("%S", fileName));
            }

            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(DataStrings.FileNotFound_S.Replace("%S", fileName));
            }

            // Get the basic header information.
            ShapefileHeader header = new ShapefileHeader(fileName);
            Extent = new Extent(new[] { header.Xmin, header.Ymin, header.Xmax, header.Ymax });

            // Check to ensure that the fileName is the correct shape type
            if (header.ShapeType != ShapeType.Polygon &&
                 header.ShapeType != ShapeType.PolygonM &&
                 header.ShapeType != ShapeType.PolygonZ)
            {
                throw new ArgumentException(DataStrings.FileNotLines_S.Replace("%S", fileName));
            }

            // Reading the headers gives us an easier way to track the number of shapes and their overall length etc.
            List<ShapeHeader> shapeHeaders = ReadIndexFile(fileName);

            // TO DO: replace with a normal reader.  We no longer need Buffered Binary reader as
            // the buffer can be set on the underlying file stream.
            BufferedBinaryReader bbReader = new BufferedBinaryReader(fileName, progressHandler);

            if (bbReader.FileLength == 100)
            {
                // The shapefile is empty so we can simply return here
                bbReader.Close();
                return;
            }

            // Skip the shapefile header by skipping the first 100 bytes in the shapefile
            bbReader.Seek(100, SeekOrigin.Begin);

            int numShapes = shapeHeaders.Count;

            int[] partOffsets = new int[numShapes];
            //byte[] allBounds = new byte[numShapes * 32];

            // probably all will be in one block, but use a byteBlock just in case.
            ByteBlock allParts = new ByteBlock(BLOCKSIZE);
            ByteBlock allCoords = new ByteBlock(BLOCKSIZE);
            bool isM = (header.ShapeType == ShapeType.PolygonM || header.ShapeType == ShapeType.PolygonZ);
            bool isZ = (header.ShapeType == ShapeType.PolygonZ);
            ByteBlock allZ = null;
            ByteBlock allM = null;
            if (isZ)
            {
                allZ = new ByteBlock(BLOCKSIZE);
            }
            if (isM)
            {
                allM = new ByteBlock(BLOCKSIZE);
            }

            int pointOffset = 0;
            for (int shp = 0; shp < numShapes; shp++)
            {
                // Read from the index file because some deleted records
                // might still exist in the .shp file.
                long offset = (shapeHeaders[shp].ByteOffset);
                bbReader.Seek(offset, SeekOrigin.Begin);

                // Position  Value Type    Number  Byte Order
                ShapeRange shape = new ShapeRange(FeatureType.Polygon); //------------------------------------
                shape.RecordNumber = bbReader.ReadInt32(false);         // Byte 0   Record Integer   1     Big
                shape.ContentLength = bbReader.ReadInt32(false);        // Byte 4   Length Integer   1     Big

                // Setting shape type also controls extent class type.
                shape.ShapeType = (ShapeType)bbReader.ReadInt32();      // Byte 8   Type   Integer   1     Little
                shape.StartIndex = pointOffset;
                if (shape.ShapeType == ShapeType.NullShape)
                {
                    continue;
                }
                shape.Extent.MinX = bbReader.ReadDouble();
                shape.Extent.MinY = bbReader.ReadDouble();
                shape.Extent.MaxX = bbReader.ReadDouble();
                shape.Extent.MaxY = bbReader.ReadDouble();
                shape.NumParts = bbReader.ReadInt32();                  // Byte 44  #Parts  Integer  1    Little
                shape.NumPoints = bbReader.ReadInt32();                 // Byte 48  #Points Integer  1    Little
                partOffsets[shp] = allParts.IntOffset();
                allParts.Read(shape.NumParts * 4, bbReader);
                allCoords.Read(shape.NumPoints * 16, bbReader);
                pointOffset += shape.NumPoints;

                if (header.ShapeType == ShapeType.PolygonM)
                {
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (shape.ContentLength * 2 > 44 + 4 * shape.NumParts + 16 * shape.NumPoints)
                    {
                        IExtentM mExt = (IExtentM)shape.Extent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();

                        if (allM != null) allM.Read(shape.NumPoints * 8, bbReader);
                    }
                }

                if (header.ShapeType == ShapeType.PolygonZ)
                {
                    bool hasM = shape.ContentLength * 2 > 60 + 4 * shape.NumParts + 24 * shape.NumPoints;
                    IExtentZ zExt = (IExtentZ)shape.Extent;
                    zExt.MinZ = bbReader.ReadDouble();
                    zExt.MaxZ = bbReader.ReadDouble();

                    // For Z shapefiles, the Z part is not optional.
                    if (allZ != null) allZ.Read(shape.NumPoints * 8, bbReader);
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (hasM)
                    {
                        IExtentM mExt = (IExtentM)shape.Extent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null) allM.Read(shape.NumPoints * 8, bbReader);
                    }
                }
                ShapeIndices.Add(shape);
            }

            double[] vert = allCoords.ToDoubleArray();
            Vertex = vert;
            if (isM) M = allM.ToDoubleArray();
            if (isZ) Z = allZ.ToDoubleArray();
            List<ShapeRange> shapes = ShapeIndices;
            //double[] bounds = new double[numShapes * 4];
            //Buffer.BlockCopy(allBounds, 0, bounds, 0, allBounds.Length);
            int[] parts = allParts.ToIntArray();
            ProgressMeter = new ProgressMeter(ProgressHandler, "Testing Parts and Holes", shapes.Count);
            for (int shp = 0; shp < shapes.Count; shp++)
            {
                ShapeRange shape = shapes[shp];
                //shape.Extent = new Extent(bounds, shp * 4);
                for (int part = 0; part < shape.NumParts; part++)
                {
                    int offset = partOffsets[shp];
                    int endIndex = shape.NumPoints + shape.StartIndex;
                    int startIndex = parts[offset + part] + shape.StartIndex;
                    if (part < shape.NumParts - 1) endIndex = parts[offset + part + 1] + shape.StartIndex;
                    int count = endIndex - startIndex;
                    PartRange partR = new PartRange(vert, shape.StartIndex, parts[offset + part], FeatureType.Polygon);
                    partR.NumVertices = count;
                    shape.Parts.Add(partR);
                }
                ProgressMeter.CurrentValue = shp;
            }
            ProgressMeter.Reset();
        }
Ejemplo n.º 3
0
        private void FillLines(string fileName, IProgressHandler progressHandler)
        {
            // Check to ensure the fileName is not null
            if (fileName == null)
            {
                throw new NullReferenceException(DataStrings.ArgumentNull_S.Replace("%S", "fileName"));
            }

            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(DataStrings.FileNotFound_S.Replace("%S", fileName));
            }

            // Get the basic header information.
            ShapefileHeader header = new ShapefileHeader(fileName);

            Extent = new Extent(new[] { header.Xmin, header.Ymin, header.Xmax, header.Ymax });
            // Check to ensure that the fileName is the correct shape type
            if (header.ShapeType != ShapeType.PolyLine &&
                header.ShapeType != ShapeType.PolyLineM &&
                header.ShapeType != ShapeType.PolyLineZ)
            {
                throw new ArgumentException(DataStrings.FileNotLines_S.Replace("%S", fileName));
            }

            // Reading the headers gives us an easier way to track the number of shapes and their overall length etc.
            List <ShapeHeader> shapeHeaders = ReadIndexFile(fileName);

            // This will set up a reader so that we can read values in huge chunks, which is much faster
            // than one value at a time.
            BufferedBinaryReader bbReader = new BufferedBinaryReader(fileName, progressHandler);

            if (bbReader.FileLength == 100)
            {
                // We have reached the end of the file so we can close the file
                bbReader.Close();
                return;
            }

            // Skip the shapefile header by skipping the first 100 bytes in the shapefile
            bbReader.Seek(100, SeekOrigin.Begin);

            int numShapes = shapeHeaders.Count;

            int[]  partOffsets = new int[numShapes];
            byte[] allBounds   = new byte[numShapes * 32];
            // probably all will be in one block, but use a byteBlock just in case.
            ByteBlock allParts  = new ByteBlock(BLOCKSIZE);
            ByteBlock allCoords = new ByteBlock(BLOCKSIZE);
            bool      isM       = (header.ShapeType == ShapeType.PolyLineM || header.ShapeType == ShapeType.PolyLineZ);
            bool      isZ       = (header.ShapeType == ShapeType.PolyLineZ);
            ByteBlock allZ      = null;
            ByteBlock allM      = null;

            if (isZ)
            {
                allZ = new ByteBlock(BLOCKSIZE);
            }
            if (isM)
            {
                allM = new ByteBlock(BLOCKSIZE);
            }

            int pointOffset = 0;

            for (int shp = 0; shp < numShapes; shp++)
            {
                // Read from the index file because some deleted records
                // might still exist in the .shp file.
                long offset = (shapeHeaders[shp].ByteOffset);
                bbReader.Seek(offset, SeekOrigin.Begin);

                ShapeRange shape = new ShapeRange(FeatureType.Line)
                {
                    RecordNumber  = bbReader.ReadInt32(false),
                    ContentLength = bbReader.ReadInt32(false),
                    ShapeType     = (ShapeType)bbReader.ReadInt32(),
                    StartIndex    = pointOffset
                };

                if (shape.ShapeType == ShapeType.NullShape)
                {
                    goto fin;
                }
                bbReader.Read(allBounds, shp * 32, 32);
                shape.NumParts  = bbReader.ReadInt32();  // Byte 44      NumParts    Integer     1      Little
                shape.NumPoints = bbReader.ReadInt32();  // Byte 48      NumPoints   Integer     1      Little

                partOffsets[shp] = allParts.IntOffset();
                allParts.Read(shape.NumParts * 4, bbReader);

                allCoords.Read(shape.NumPoints * 16, bbReader);

                pointOffset += shape.NumPoints;

                if (header.ShapeType == ShapeType.PolyLineM)
                {
                    // These are listed as "optional" but there isn't a good indicator of how to
                    // determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (shape.ContentLength * 2 > 44 + 4 * shape.NumParts + 16 * shape.NumPoints)
                    {
                        //mMin = bbReader.ReadDouble();
                        //mMax = bbReader.ReadDouble();
                        bbReader.Seek(16, SeekOrigin.Current);
                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }
                if (header.ShapeType == ShapeType.PolyLineZ)
                {
                    bool     hasM = shape.ContentLength * 2 > 60 + 4 * shape.NumParts + 24 * shape.NumPoints;
                    IExtentZ zExt = (IExtentZ)shape.Extent;
                    zExt.MinZ = bbReader.ReadDouble();
                    zExt.MaxZ = bbReader.ReadDouble();
                    if (allZ != null)
                    {
                        allZ.Read(shape.NumPoints * 8, bbReader);
                    }

                    // These are listed as "optional" but there isn't a good indicator of how to
                    // determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    IExtentM mExt = (IExtentM)shape.Extent;
                    if (hasM)
                    {
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }

                // Now that we have read all the values, create the geometries from the points and parts arrays.
fin:
                ShapeIndices.Add(shape);
            }

            double[] vert = allCoords.ToDoubleArray();
            Vertex = vert;
            if (isM)
            {
                M = allM.ToDoubleArray();
            }
            if (isZ)
            {
                Z = allZ.ToDoubleArray();
            }
            List <ShapeRange> shapes = ShapeIndices;

            double[] bounds = new double[numShapes * 4];
            Buffer.BlockCopy(allBounds, 0, bounds, 0, allBounds.Length);
            int[] parts = allParts.ToIntArray();
            for (int shp = 0; shp < numShapes; shp++)
            {
                ShapeRange shape = shapes[shp];
                shape.Extent = new Extent(bounds, shp * 4);
                for (int part = 0; part < shape.NumParts; part++)
                {
                    int offset     = partOffsets[shp];
                    int endIndex   = shape.NumPoints + shape.StartIndex;
                    int startIndex = parts[offset + part] + shape.StartIndex;
                    if (part < shape.NumParts - 1)
                    {
                        int prt = parts[offset + part + 1];
                        endIndex = prt + shape.StartIndex;
                    }
                    int       count = endIndex - startIndex;
                    PartRange partR = new PartRange(vert, shape.StartIndex, parts[offset + part], FeatureType.Line)
                    {
                        NumVertices = count
                    };
                    shape.Parts.Add(partR);
                }
            }

            bbReader.Dispose();
        }
Ejemplo n.º 4
0
        // X Y Poly Lines: Total Length = 28 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 3        Integer     1           Little
        // Byte 12      Xmin                Double      1           Little
        // Byte 20      Ymin                Double      1           Little
        // Byte 28      Xmax                Double      1           Little
        // Byte 36      Ymax                Double      1           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little

        // X Y M Poly Lines: Total Length = 34 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 23       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y*      Mmin                Double      1           Little
        // Byte Y + 8*  Mmax                Double      1           Little
        // Byte Y + 16* Marray              Double      NumPoints   Little

        // X Y Z M Poly Lines: Total Length = 44 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number  Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 13       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumParts            Integer     1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte 52      Parts               Integer     NumParts    Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y       Zmin                Double      1           Little
        // Byte Y + 8   Zmax                Double      1           Little
        // Byte Y + 16  Zarray              Double      NumPoints   Little
        // Byte Z*      Mmin                Double      1           Little
        // Byte Z+8*    Mmax                Double      1           Little
        // Byte Z+16*   Marray              Double      NumPoints   Little

        private void FillPolygons(string fileName, IProgressHandler progressHandler)
        {
            // Check to ensure the fileName is not null
            if (fileName == null)
            {
                throw new NullReferenceException(DataStrings.ArgumentNull_S.Replace("%S", fileName));
            }

            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(DataStrings.FileNotFound_S.Replace("%S", fileName));
            }

            // Get the basic header information.
            ShapefileHeader header = new ShapefileHeader(fileName);

            Extent = new Extent(new[] { header.Xmin, header.Ymin, header.Xmax, header.Ymax });

            // Check to ensure that the fileName is the correct shape type
            if (header.ShapeType != ShapeType.Polygon &&
                header.ShapeType != ShapeType.PolygonM &&
                header.ShapeType != ShapeType.PolygonZ)
            {
                throw new ArgumentException(DataStrings.FileNotLines_S.Replace("%S", fileName));
            }

            // Reading the headers gives us an easier way to track the number of shapes and their overall length etc.
            List <ShapeHeader> shapeHeaders = ReadIndexFile(fileName);

            // TO DO: replace with a normal reader.  We no longer need Buffered Binary reader as
            // the buffer can be set on the underlying file stream.
            BufferedBinaryReader bbReader = new BufferedBinaryReader(fileName, progressHandler);

            if (bbReader.FileLength == 100)
            {
                // The shapefile is empty so we can simply return here
                bbReader.Close();
                return;
            }

            // Skip the shapefile header by skipping the first 100 bytes in the shapefile
            bbReader.Seek(100, SeekOrigin.Begin);

            int numShapes = shapeHeaders.Count;

            int[] partOffsets = new int[numShapes];
            //byte[] allBounds = new byte[numShapes * 32];

            // probably all will be in one block, but use a byteBlock just in case.
            ByteBlock allParts  = new ByteBlock(BLOCKSIZE);
            ByteBlock allCoords = new ByteBlock(BLOCKSIZE);
            bool      isM       = (header.ShapeType == ShapeType.PolygonM || header.ShapeType == ShapeType.PolygonZ);
            bool      isZ       = (header.ShapeType == ShapeType.PolygonZ);
            ByteBlock allZ      = null;
            ByteBlock allM      = null;

            if (isZ)
            {
                allZ = new ByteBlock(BLOCKSIZE);
            }
            if (isM)
            {
                allM = new ByteBlock(BLOCKSIZE);
            }

            int pointOffset = 0;

            for (int shp = 0; shp < numShapes; shp++)
            {
                // Read from the index file because some deleted records
                // might still exist in the .shp file.
                long offset = (shapeHeaders[shp].ByteOffset);
                bbReader.Seek(offset, SeekOrigin.Begin);

                // Position  Value Type    Number  Byte Order
                ShapeRange shape = new ShapeRange(FeatureType.Polygon); //------------------------------------
                shape.RecordNumber  = bbReader.ReadInt32(false);        // Byte 0   Record Integer   1     Big
                shape.ContentLength = bbReader.ReadInt32(false);        // Byte 4   Length Integer   1     Big

                // Setting shape type also controls extent class type.
                shape.ShapeType  = (ShapeType)bbReader.ReadInt32();     // Byte 8   Type   Integer   1     Little
                shape.StartIndex = pointOffset;
                if (shape.ShapeType == ShapeType.NullShape)
                {
                    continue;
                }
                shape.Extent.MinX = bbReader.ReadDouble();
                shape.Extent.MinY = bbReader.ReadDouble();
                shape.Extent.MaxX = bbReader.ReadDouble();
                shape.Extent.MaxY = bbReader.ReadDouble();
                shape.NumParts    = bbReader.ReadInt32();               // Byte 44  #Parts  Integer  1    Little
                shape.NumPoints   = bbReader.ReadInt32();               // Byte 48  #Points Integer  1    Little
                partOffsets[shp]  = allParts.IntOffset();
                allParts.Read(shape.NumParts * 4, bbReader);
                allCoords.Read(shape.NumPoints * 16, bbReader);
                pointOffset += shape.NumPoints;

                if (header.ShapeType == ShapeType.PolygonM)
                {
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (shape.ContentLength * 2 > 44 + 4 * shape.NumParts + 16 * shape.NumPoints)
                    {
                        IExtentM mExt = (IExtentM)shape.Extent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();

                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }

                if (header.ShapeType == ShapeType.PolygonZ)
                {
                    bool     hasM = shape.ContentLength * 2 > 60 + 4 * shape.NumParts + 24 * shape.NumPoints;
                    IExtentZ zExt = (IExtentZ)shape.Extent;
                    zExt.MinZ = bbReader.ReadDouble();
                    zExt.MaxZ = bbReader.ReadDouble();

                    // For Z shapefiles, the Z part is not optional.
                    if (allZ != null)
                    {
                        allZ.Read(shape.NumPoints * 8, bbReader);
                    }
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (hasM)
                    {
                        IExtentM mExt = (IExtentM)shape.Extent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }
                ShapeIndices.Add(shape);
            }

            double[] vert = allCoords.ToDoubleArray();
            Vertex = vert;
            if (isM)
            {
                M = allM.ToDoubleArray();
            }
            if (isZ)
            {
                Z = allZ.ToDoubleArray();
            }
            List <ShapeRange> shapes = ShapeIndices;

            //double[] bounds = new double[numShapes * 4];
            //Buffer.BlockCopy(allBounds, 0, bounds, 0, allBounds.Length);
            int[] parts = allParts.ToIntArray();
            ProgressMeter = new ProgressMeter(ProgressHandler, "Testing Parts and Holes", shapes.Count);
            for (int shp = 0; shp < shapes.Count; shp++)
            {
                ShapeRange shape = shapes[shp];
                //shape.Extent = new Extent(bounds, shp * 4);
                for (int part = 0; part < shape.NumParts; part++)
                {
                    int offset     = partOffsets[shp];
                    int endIndex   = shape.NumPoints + shape.StartIndex;
                    int startIndex = parts[offset + part] + shape.StartIndex;
                    if (part < shape.NumParts - 1)
                    {
                        endIndex = parts[offset + part + 1] + shape.StartIndex;
                    }
                    int       count = endIndex - startIndex;
                    PartRange partR = new PartRange(vert, shape.StartIndex, parts[offset + part], FeatureType.Polygon);
                    partR.NumVertices = count;
                    shape.Parts.Add(partR);
                }
                ProgressMeter.CurrentValue = shp;
            }
            ProgressMeter.Reset();
        }
Ejemplo n.º 5
0
        // X Y MultiPoints: Total Length = 28 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 8        Integer     1           Little
        // Byte 12      Xmin                Double      1           Little
        // Byte 20      Ymin                Double      1           Little
        // Byte 28      Xmax                Double      1           Little
        // Byte 36      Ymax                Double      1           Little
        // Byte 48      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little

        // X Y M MultiPoints: Total Length = 34 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number      Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 28       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y*      Mmin                Double      1           Little
        // Byte Y + 8*  Mmax                Double      1           Little
        // Byte Y + 16* Marray              Double      NumPoints   Little

        // X Y Z M MultiPoints: Total Length = 44 Bytes
        // ---------------------------------------------------------
        // Position     Value               Type        Number  Byte Order
        // ---------------------------------------------------------
        // Byte 0       Record Number       Integer     1           Big
        // Byte 4       Content Length      Integer     1           Big
        // Byte 8       Shape Type 18       Integer     1           Little
        // Byte 12      Box                 Double      4           Little
        // Byte 44      NumPoints           Integer     1           Little
        // Byte X       Points              Point       NumPoints   Little
        // Byte Y       Zmin                Double      1           Little
        // Byte Y + 8   Zmax                Double      1           Little
        // Byte Y + 16  Zarray              Double      NumPoints   Little
        // Byte Z*      Mmin                Double      1           Little
        // Byte Z+8*    Mmax                Double      1           Little
        // Byte Z+16*   Marray              Double      NumPoints   Little

        private void FillPoints(string fileName, IProgressHandler progressHandler)
        {
            // Check to ensure the fileName is not null
            if (fileName == null)
            {
                throw new NullReferenceException(DataStrings.ArgumentNull_S.Replace("%S", "fileName"));
            }

            if (File.Exists(fileName) == false)
            {
                throw new FileNotFoundException(DataStrings.FileNotFound_S.Replace("%S", fileName));
            }

            // Get the basic header information.
            ShapefileHeader header = new ShapefileHeader(fileName);

            Extent = header.ToExtent();
            // Check to ensure that the fileName is the correct shape type
            if (header.ShapeType != ShapeType.MultiPoint &&
                header.ShapeType != ShapeType.MultiPointM &&
                header.ShapeType != ShapeType.MultiPointZ)
            {
                throw new ArgumentException(DataStrings.FileNotLines_S.Replace("%S", fileName));
            }

            // Reading the headers gives us an easier way to track the number of shapes and their overall length etc.
            List <ShapeHeader> shapeHeaders = ReadIndexFile(fileName);

            // This will set up a reader so that we can read values in huge chunks, which is much faster than one value at a time.
            BufferedBinaryReader bbReader = new BufferedBinaryReader(fileName, progressHandler);

            if (bbReader.FileLength == 100)
            {
                // The shapefile is empty so we can simply return here
                bbReader.Close();
                return;
            }

            // Skip the shapefile header by skipping the first 100 bytes in the shapefile
            bbReader.Seek(100, SeekOrigin.Begin);

            int numShapes = shapeHeaders.Count;

            byte[] bigEndians = new byte[numShapes * 8];
            byte[] allBounds  = new byte[numShapes * 32];

            ByteBlock allCoords = new ByteBlock(BLOCKSIZE);
            bool      isM       = (header.ShapeType == ShapeType.MultiPointZ || header.ShapeType == ShapeType.MultiPointM);
            bool      isZ       = (header.ShapeType == ShapeType.MultiPointZ);
            ByteBlock allZ      = null;
            ByteBlock allM      = null;

            if (isZ)
            {
                allZ = new ByteBlock(BLOCKSIZE);
            }
            if (isM)
            {
                allM = new ByteBlock(BLOCKSIZE);
            }
            int pointOffset = 0;

            for (int shp = 0; shp < numShapes; shp++)
            {
                // Read from the index file because some deleted records
                // might still exist in the .shp file.
                long offset = (shapeHeaders[shp].ByteOffset);
                bbReader.Seek(offset, SeekOrigin.Begin);

                // time: 200 ms
                ShapeRange shape = new ShapeRange(FeatureType.MultiPoint)
                {
                    RecordNumber  = bbReader.ReadInt32(false),
                    ContentLength = bbReader.ReadInt32(false),
                    ShapeType     = (ShapeType)bbReader.ReadInt32(),
                    StartIndex    = pointOffset
                };

                //bbReader.Read(bigEndians, shp * 8, 8);
                if (shape.ShapeType == ShapeType.NullShape)
                {
                    continue;
                }
                bbReader.Read(allBounds, shp * 32, 32);
                shape.NumParts  = 1;
                shape.NumPoints = bbReader.ReadInt32();
                allCoords.Read(shape.NumPoints * 16, bbReader);
                pointOffset += shape.NumPoints;

                if (header.ShapeType == ShapeType.MultiPointM)
                {
                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (shape.ContentLength * 2 > 44 + 4 * shape.NumParts + 16 * shape.NumPoints)
                    {
                        IExtentM mExt = (IExtentM)MyExtent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }
                if (header.ShapeType == ShapeType.MultiPointZ)
                {
                    bool     hasM = shape.ContentLength * 2 > 60 + 4 * shape.NumParts + 24 * shape.NumPoints;
                    IExtentZ zExt = (IExtentZ)MyExtent;
                    zExt.MinZ = bbReader.ReadDouble();
                    zExt.MaxZ = bbReader.ReadDouble();
                    // For Z shapefiles, the Z part is not optional.
                    if (allZ != null)
                    {
                        allZ.Read(shape.NumPoints * 8, bbReader);
                    }

                    // These are listed as "optional" but there isn't a good indicator of
                    // how to determine if they were added.
                    // To handle the "optional" M values, check the contentLength for the feature.
                    // The content length does not include the 8-byte record header and is listed in 16-bit words.
                    if (hasM)
                    {
                        IExtentM mExt = (IExtentM)MyExtent;
                        mExt.MinM = bbReader.ReadDouble();
                        mExt.MaxM = bbReader.ReadDouble();
                        if (allM != null)
                        {
                            allM.Read(shape.NumPoints * 8, bbReader);
                        }
                    }
                }
                // Now that we have read all the values, create the geometries from the points and parts arrays.
                ShapeIndices.Add(shape);
            }
            double[] vert = allCoords.ToDoubleArray();
            Vertex = vert;
            if (isM)
            {
                M = allM.ToDoubleArray();
            }
            if (isZ)
            {
                Z = allZ.ToDoubleArray();
            }
            Array.Reverse(bigEndians);
            List <ShapeRange> shapes = ShapeIndices;

            double[] bounds = new double[numShapes * 4];
            Buffer.BlockCopy(allBounds, 0, bounds, 0, allBounds.Length);
            for (int shp = 0; shp < numShapes; shp++)
            {
                ShapeRange shape = shapes[shp];
                shape.Extent = new Extent(bounds, shp * 4);
                int       endIndex   = shape.NumPoints + shape.StartIndex;
                int       startIndex = shape.StartIndex;
                int       count      = endIndex - startIndex;
                PartRange partR      = new PartRange(vert, shape.StartIndex, 0, FeatureType.MultiPoint)
                {
                    NumVertices = count
                };
                shape.Parts.Add(partR);
            }

            bbReader.Dispose();
        }