/// <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();
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));
new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
points.Add(external);
}
lines[part] = geometryFactory.CreateLineString((ICoordinate[])points.ToArray(typeof(ICoordinate)));
}
return(geometryFactory.CreateMultiLineString(lines));
}
/// <summary>
/// Initializes a new instance of the ShapefileHeader class with values read in from the stream.
/// </summary>
/// <remarks>Reads the header information from the stream.</remarks>
/// <param name="shpBinaryReader">BigEndianBinaryReader stream to the shapefile.</param>
public ShapefileHeader(BigEndianBinaryReader shpBinaryReader)
{
if (shpBinaryReader == null)
{
throw new ArgumentNullException("shpBinaryReader");
}
_fileCode = shpBinaryReader.ReadInt32BE();
if (_fileCode != Shapefile.ShapefileId)
{
throw new ShapefileException("The first four bytes of this file indicate this is not a shape file.");
}
// skip 5 unsed bytes
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
_fileLength = shpBinaryReader.ReadInt32BE();
_version = shpBinaryReader.ReadInt32();
Debug.Assert(_version == 1000, "Shapefile version", String.Format("Expecting only one version (1000), but got {0}", _version));
int shapeType = shpBinaryReader.ReadInt32();
_shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeType.ToString());
//read in and store the bounding box
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
{
coords[i] = shpBinaryReader.ReadDouble();
}
_bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// skip z and m bounding boxes.
for (int i = 0; i < 4; i++)
{
shpBinaryReader.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();
ShapeGeometryTypes shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeTypeNum.ToString());
if (!(shapeType == ShapeGeometryTypes.Point || shapeType == ShapeGeometryTypes.PointM ||
shapeType == ShapeGeometryTypes.PointZ || shapeType == ShapeGeometryTypes.PointZM))
{
throw new ShapefileException("Attempting to load a point 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.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[] 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++)
{
Coordinate external = new Coordinate(file.ReadDouble(), file.ReadDouble());
new PrecisionModel(geometryFactory.PrecisionModel).MakePrecise(external);
Coordinate internalCoord = external;
points.Add(internalCoord);
}
ILinearRing ring = geometryFactory.CreateLinearRing((Coordinate[])points.ToArray(typeof(Coordinate)));
// 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((Coordinate[])points.ToArray(typeof(Coordinate))))
{
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;
ICoordinate 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, (Coordinate[])coordList.ToArray(typeof(Coordinate))) ||
(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]);
}
}
}
IPolygon[] polygons = new Polygon[shells.Count];
for (int i = 0; i < shells.Count; i++)
{
polygons[i] = geometryFactory.CreatePolygon((LinearRing)shells[i],
(LinearRing[])((ArrayList)holesForShells[i]).ToArray(typeof(LinearRing)));
}
if (polygons.Length == 1)
{
return(polygons[0]);
}
// It's a multi part
return(geometryFactory.CreateMultiPolygon(polygons));
}
/// <summary>
///
/// </summary>
/// <param name="beReader"></param>
private void ReadFeatureHeader(BigEndianBinaryReader beReader)
{
int recordNumber = beReader.ReadInt32BE();
int contentLength = beReader.ReadInt32BE();
int shapeType = beReader.ReadInt32();
}
