/// <summary>
/// Returns the next ")" or "," in the stream.
/// </summary>
/// <param name="tokenizer">tokenizer over a stream of text in Well-known Text
/// format. The next token must be ")" or ",".</param>
/// <returns>Returns the next ")" or "," in the stream.</returns>
/// <remarks>
/// ParseException is thrown if the next token is not ")" or ",".
/// </remarks>
private static string GetNextCloserOrComma(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "," || nextWord == ")")
{
return(nextWord);
}
throw new Exception("Expected ')' or ',' but encountered '" + nextWord + "'");
}
/// <summary>
/// Returns the next "EMPTY" or "(" in the stream as uppercase text.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next token must be "EMPTY" or "(".</param>
/// <returns>the next "EMPTY" or "(" in the stream as uppercase
/// text.</returns>
/// <remarks>
/// ParseException is thrown if the next token is not "EMPTY" or "(".
/// </remarks>
private static string GetNextEmptyOrOpener(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "EMPTY" || nextWord == "(")
{
return(nextWord);
}
throw new Exception("Expected 'EMPTY' or '(' but encountered '" + nextWord + "'");
}
/// <summary>
/// Reads and parses a WKT-formatted projection string.
/// </summary>
/// <param name="wkt">String containing WKT.</param>
/// <returns>Object representation of the WKT.</returns>
/// <exception cref="System.ArgumentException">If a token is not recognised.</exception>
public static IInfo Parse(string wkt)
{
IInfo returnObject = null;
StringReader reader = new StringReader(wkt);
WktStreamTokenizer tokenizer = new WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "UNIT":
returnObject = ReadUnit(tokenizer);
break;
//case "VERT_DATUM":
// IVerticalDatum verticalDatum = ReadVerticalDatum(tokenizer);
// returnObject = verticalDatum;
// break;
case "SPHEROID":
returnObject = ReadEllipsoid(tokenizer);
break;
case "DATUM":
returnObject = ReadHorizontalDatum(tokenizer);;
break;
case "PRIMEM":
returnObject = ReadPrimeMeridian(tokenizer);
break;
case "VERT_CS":
case "GEOGCS":
case "PROJCS":
case "COMPD_CS":
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
returnObject = ReadCoordinateSystem(wkt, tokenizer);
break;
default:
throw new ArgumentException(String.Format("{0} is not recongnized.", objectName));
}
reader.Close();
return(returnObject);
}
/// <summary>
/// Returns a <see cref="AngularUnit"/> given a piece of WKT.
/// </summary>
/// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
/// <returns>An object that implements the IUnit interface.</returns>
private static IAngularUnit ReadAngularUnit(WktStreamTokenizer tokenizer)
{
tokenizer.ReadToken("[");
string unitName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double unitsPerUnit = tokenizer.GetNumericValue();
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
return(new AngularUnit(unitsPerUnit, unitName, authority, authorityCode, String.Empty, String.Empty, String.Empty));
}
/// <summary>
/// Creates a Geometry using the next token in the stream.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next tokens must form a <Geometry Tagged Text>.</param>
/// <returns>Returns a Geometry specified by the next token in the stream.</returns>
/// <remarks>
/// Exception is thrown if the coordinates used to create a Polygon
/// shell and holes do not form closed linestrings, or if an unexpected
/// token is encountered.
/// </remarks>
private static Geometry ReadGeometryTaggedText(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
var type = tokenizer.GetStringValue().ToUpper();
Geometry geometry;
GeometryFactory factory = new GeometryFactory();
switch (type)
{
case "POINT":
geometry = ReadPointText(tokenizer, factory);
break;
case "LINESTRING":
geometry = ReadLineStringText(tokenizer, factory);
break;
case "MultiPoint":
geometry = ReadMultiPointText(tokenizer, factory);
break;
case "MultiLineString":
geometry = ReadMultiLineStringText(tokenizer, factory);
break;
case "POLYGON":
geometry = ReadPolygonText(tokenizer, factory);
break;
case "MultiPolygon":
geometry = ReadMultiPolygonText(tokenizer, factory);
break;
case "GEOMETRYCOLLECTION":
geometry = ReadGeometryCollectionText(tokenizer, factory);
break;
default:
throw new Exception(String.Format(Map.NumberFormatEnUs, "Geometrytype '{0}' is not supported.",
type));
}
return(geometry);
}
/// <summary>
/// Creates a Geometry using the next token in the stream.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next tokens must form a <Geometry Tagged Text>.</param>
/// <returns>Returns a Geometry specified by the next token in the stream.</returns>
/// <remarks>
/// Exception is thrown if the coordinates used to create a Polygon
/// shell and holes do not form closed linestrings, or if an unexpected
/// token is encountered.
/// </remarks>
private static Geometry ReadGeometryTaggedText(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string type = tokenizer.GetStringValue().ToUpper();
Geometry geometry = null;
switch (type)
{
case "POINT":
geometry = ReadPointText(tokenizer);
break;
case "LINESTRING":
geometry = ReadLineStringText(tokenizer);
break;
case "MULTIPOINT":
geometry = ReadMultiPointText(tokenizer);
break;
case "MULTILINESTRING":
geometry = ReadMultiLineStringText(tokenizer);
break;
case "POLYGON":
geometry = ReadPolygonText(tokenizer);
break;
case "MULTIPOLYGON":
geometry = ReadMultiPolygonText(tokenizer);
break;
case "GEOMETRYCOLLECTION":
geometry = ReadGeometryCollectionText(tokenizer);
break;
default:
throw new Exception(String.Format(SharpMap.Map.numberFormat_EnUS, "Geometrytype '{0}' is not supported.", type));
}
return(geometry);
}
/// <summary>
/// Reads and parses a WKT-formatted projection string.
/// </summary>
/// <param name="wkt">String containing WKT.</param>
/// <returns>Object representation of the WKT.</returns>
/// <exception cref="System.ArgumentException">If a token is not recognised.</exception>
public static IInfo Parse(string wkt)
{
IInfo returnObject = null;
StringReader reader = new StringReader(wkt);
WktStreamTokenizer tokenizer = new WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "UNIT":
returnObject = ReadUnit(tokenizer);
break;
//case "VERT_DATUM":
// IVerticalDatum verticalDatum = ReadVerticalDatum(tokenizer);
// returnObject = verticalDatum;
// break;
case "SPHEROID":
returnObject = ReadEllipsoid(tokenizer);
break;
case "DATUM":
returnObject = ReadHorizontalDatum(tokenizer); ;
break;
case "PRIMEM":
returnObject = ReadPrimeMeridian(tokenizer);
break;
case "VERT_CS":
case "GEOGCS":
case "PROJCS":
case "COMPD_CS":
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
returnObject = ReadCoordinateSystem(wkt, tokenizer);
break;
default:
throw new ArgumentException(String.Format("'{0'} is not recongnized.", objectName));
}
reader.Close();
return returnObject;
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IPrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
{
//PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double longitude = tokenizer.GetNumericValue();
tokenizer.NextToken();
string authority = String.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
// make an assumption about the Angular units - degrees.
IPrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return(primeMeridian);
}
/// <summary>
/// Reads either 3, 6 or 7 parameter Bursa-Wolf values from TOWGS84 token
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static Wgs84ConversionInfo ReadWGS84ConversionInfo(WktStreamTokenizer tokenizer)
{
//TOWGS84[0,0,0,0,0,0,0]
tokenizer.ReadToken("[");
Wgs84ConversionInfo info = new Wgs84ConversionInfo();
tokenizer.NextToken();
info.Dx = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dy = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dz = tokenizer.GetNumericValue();
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
info.Ex = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ey = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ez = tokenizer.GetNumericValue();
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
info.Ppm = tokenizer.GetNumericValue();
}
}
if (tokenizer.GetStringValue() != "]")
tokenizer.ReadToken("]");
return info;
}
/// <summary>
/// Returns a IUnit given a piece of WKT.
/// </summary>
/// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
/// <returns>An object that implements the IUnit interface.</returns>
private static IUnit ReadUnit(WktStreamTokenizer tokenizer)
{
tokenizer.ReadToken("[");
string unitName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double unitsPerUnit = tokenizer.GetNumericValue();
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
return new Unit(unitsPerUnit, unitName, authority, authorityCode, String.Empty, String.Empty, String.Empty);
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IProjection ReadProjection(WktStreamTokenizer tokenizer)
{
//tokenizer.NextToken();// PROJECTION
tokenizer.ReadToken("PROJECTION");
tokenizer.ReadToken("[");//[
string projectionName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken("]");//]
tokenizer.ReadToken(",");//,
tokenizer.ReadToken("PARAMETER");
List<ProjectionParameter> paramList = new List<ProjectionParameter>();
while (tokenizer.GetStringValue() == "PARAMETER")
{
tokenizer.ReadToken("[");
string paramName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double paramValue = tokenizer.GetNumericValue();
tokenizer.ReadToken("]");
tokenizer.ReadToken(",");
paramList.Add(new ProjectionParameter(paramName, paramValue));
tokenizer.NextToken();
}
string authority = String.Empty;
long authorityCode = -1;
IProjection projection = new Projection(projectionName, paramList, projectionName, authority, authorityCode, String.Empty, String.Empty, string.Empty);
return projection;
}
/// <summary>
/// Returns the next "EMPTY" or "(" in the stream as uppercase text.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next token must be "EMPTY" or "(".</param>
/// <returns>the next "EMPTY" or "(" in the stream as uppercase
/// text.</returns>
/// <remarks>
/// ParseException is thrown if the next token is not "EMPTY" or "(".
/// </remarks>
private static string GetNextEmptyOrOpener(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "EMPTY" || nextWord == "(")
return nextWord;
throw new Exception("Expected 'EMPTY' or '(' but encountered '" + nextWord + "'");
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IGeographicCoordinateSystem ReadGeographicCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*
GEOGCS["OSGB 1936",
DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
AXIS["Geodetic latitude","NORTH"]
AXIS["Geodetic longitude","EAST"]
AUTHORITY["EPSG","4277"]
]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("DATUM");
IHorizontalDatum horizontalDatum = ReadHorizontalDatum(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("PRIMEM");
IPrimeMeridian primeMeridian = ReadPrimeMeridian(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("UNIT");
IAngularUnit angularUnit = ReadAngularUnit(tokenizer);
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
List<AxisInfo> info = new List<AxisInfo>(2);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
info.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
//This is default axis values if not specified.
if (info.Count == 0)
{
info.Add(new AxisInfo("Lon", AxisOrientationEnum.East));
info.Add(new AxisInfo("Lat", AxisOrientationEnum.North));
}
IGeographicCoordinateSystem geographicCS = new GeographicCoordinateSystem(angularUnit, horizontalDatum,
primeMeridian, info, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return geographicCS;
}
/*
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static ICompoundCoordinateSystem ReadCompoundCoordinateSystem(WktStreamTokenizer tokenizer)
{
//COMPD_CS[
//"OSGB36 / British National Grid + ODN",
//PROJCS[]
//VERT_CS[]
//AUTHORITY["EPSG","7405"]
//]
tokenizer.ReadToken("[");
string name=tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
string headCSCode = tokenizer.GetStringValue();
ICoordinateSystem headCS = ReadCoordinateSystem(headCSCode,tokenizer);
tokenizer.ReadToken(",");
tokenizer.NextToken();
string tailCSCode = tokenizer.GetStringValue();
ICoordinateSystem tailCS = ReadCoordinateSystem(tailCSCode,tokenizer);
tokenizer.ReadToken(",");
string authority=String.Empty;
string authorityCode=String.Empty;
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
ICompoundCoordinateSystem compoundCS = new CompoundCoordinateSystem(headCS,tailCS,String.Empty,authority,authorityCode,name,String.Empty,String.Empty);
return compoundCS;
}*/
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IEllipsoid ReadEllipsoid(WktStreamTokenizer tokenizer)
{
//SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double majorAxis = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double e = tokenizer.GetNumericValue();
//
//tokenizer.ReadToken(",");
tokenizer.NextToken();
string authority = String.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",") //Read authority
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
IEllipsoid ellipsoid = new Ellipsoid(majorAxis, 0.0, e, true, LinearUnit.Metre, name, authority, authorityCode, String.Empty, string.Empty, string.Empty);
return ellipsoid;
}
/// <summary>
///
/// </summary>
/// <param name="coordinateSystem"></param>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static ICoordinateSystem ReadCoordinateSystem(string coordinateSystem, WktStreamTokenizer tokenizer)
{
switch (tokenizer.GetStringValue())
{
case "GEOGCS":
return ReadGeographicCoordinateSystem(tokenizer);
case "PROJCS":
return ReadProjectedCoordinateSystem(tokenizer);
case "COMPD_CS":
/* ICompoundCoordinateSystem compoundCS = ReadCompoundCoordinateSystem(tokenizer);
returnCS = compoundCS;
break;*/
case "VERT_CS":
/* IVerticalCoordinateSystem verticalCS = ReadVerticalCoordinateSystem(tokenizer);
returnCS = verticalCS;
break;*/
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
throw new NotSupportedException(String.Format("{0} coordinate system is not supported.", coordinateSystem));
default:
throw new InvalidOperationException(String.Format("{0} coordinate system is not recognized.", coordinateSystem));
}
}
/// <summary>
/// Returns a <see cref="AxisInfo"/> given a piece of WKT.
/// </summary>
/// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
/// <returns>An AxisInfo object.</returns>
private static AxisInfo ReadAxis(WktStreamTokenizer tokenizer)
{
if (tokenizer.GetStringValue() != "AXIS")
tokenizer.ReadToken("AXIS");
tokenizer.ReadToken("[");
string axisName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
string unitname = tokenizer.GetStringValue();
tokenizer.ReadToken("]");
switch (unitname.ToUpper())
{
case "DOWN": return new AxisInfo(axisName, AxisOrientationEnum.Down);
case "EAST": return new AxisInfo(axisName, AxisOrientationEnum.East);
case "NORTH": return new AxisInfo(axisName, AxisOrientationEnum.North);
case "OTHER": return new AxisInfo(axisName, AxisOrientationEnum.Other);
case "SOUTH": return new AxisInfo(axisName, AxisOrientationEnum.South);
case "UP": return new AxisInfo(axisName, AxisOrientationEnum.Up);
case "WEST": return new AxisInfo(axisName, AxisOrientationEnum.West);
default:
throw new ArgumentException("Invalid axis name '" + unitname + "' in WKT");
}
}
/// <summary>
/// Returns the next word in the stream as uppercase text.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next token must be a word.</param>
/// <returns>Returns the next word in the stream as uppercase text.</returns>
/// <remarks>
/// Exception is thrown if the next token is not a word.
/// </remarks>
private static string GetNextWord(WktStreamTokenizer tokenizer)
{
TokenType type = tokenizer.NextToken();
string token = tokenizer.GetStringValue();
if (type == TokenType.Number)
throw new Exception("Expected a number but got " + token);
else if (type == TokenType.Word)
return token.ToUpper();
else if (token == "(")
return "(";
else if (token == ")")
return ")";
else if (token == ",")
return ",";
throw new Exception("Not a valid symbol in WKT format.");
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IHorizontalDatum ReadHorizontalDatum(WktStreamTokenizer tokenizer)
{
//DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
Wgs84ConversionInfo wgsInfo = null;
string authority = String.Empty;
long authorityCode = -1;
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("SPHEROID");
IEllipsoid ellipsoid = ReadEllipsoid(tokenizer);
tokenizer.NextToken();
while (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
if (tokenizer.GetStringValue() == "TOWGS84")
{
wgsInfo = ReadWGS84ConversionInfo(tokenizer);
tokenizer.NextToken();
}
else if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
// make an assumption about the datum type.
IHorizontalDatum horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, DatumType.HD_Geocentric, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return horizontalDatum;
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*PROJCS[
* "OSGB 1936 / British National Grid",
* GEOGCS[
* "OSGB 1936",
* DATUM[...]
* PRIMEM[...]
* AXIS["Geodetic latitude","NORTH"]
* AXIS["Geodetic longitude","EAST"]
* AUTHORITY["EPSG","4277"]
* ],
* PROJECTION["Transverse Mercator"],
* PARAMETER["latitude_of_natural_origin",49],
* PARAMETER["longitude_of_natural_origin",-2],
* PARAMETER["scale_factor_at_natural_origin",0.999601272],
* PARAMETER["false_easting",400000],
* PARAMETER["false_northing",-100000],
* AXIS["Easting","EAST"],
* AXIS["Northing","NORTH"],
* AUTHORITY["EPSG","27700"]
* ]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("GEOGCS");
IGeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer);
tokenizer.ReadToken(",");
IProjection projection = ReadProjection(tokenizer);
IUnit unit = ReadLinearUnit(tokenizer);
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
List <AxisInfo> axes = new List <AxisInfo>(2);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
axes.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
//This is default axis values if not specified.
if (axes.Count == 0)
{
axes.Add(new AxisInfo("X", AxisOrientationEnum.East));
axes.Add(new AxisInfo("Y", AxisOrientationEnum.North));
}
IProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return(projectedCS);
}
/// <summary>
/// Returns the next ")" or "," in the stream.
/// </summary>
/// <param name="tokenizer">tokenizer over a stream of text in Well-known Text
/// format. The next token must be ")" or ",".</param>
/// <returns>Returns the next ")" or "," in the stream.</returns>
/// <remarks>
/// ParseException is thrown if the next token is not ")" or ",".
/// </remarks>
private static string GetNextCloserOrComma(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string nextWord = tokenizer.GetStringValue();
if (nextWord == "," || nextWord == ")")
{
return nextWord;
}
throw new Exception("Expected ')' or ',' but encountered '" + nextWord + "'");
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IPrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
{
//PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double longitude = tokenizer.GetNumericValue();
tokenizer.NextToken();
string authority = String.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
// make an assumption about the Angular units - degrees.
IPrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return primeMeridian;
}
/// <summary>
/// Creates a Geometry using the next token in the stream.
/// </summary>
/// <param name="tokenizer">Tokenizer over a stream of text in Well-known Text
/// format. The next tokens must form a <Geometry Tagged Text>.</param>
/// <returns>Returns a Geometry specified by the next token in the stream.</returns>
/// <remarks>
/// Exception is thrown if the coordinates used to create a Polygon
/// shell and holes do not form closed linestrings, or if an unexpected
/// token is encountered.
/// </remarks>
private static Geometry ReadGeometryTaggedText(WktStreamTokenizer tokenizer)
{
tokenizer.NextToken();
string type = tokenizer.GetStringValue().ToUpper();
Geometry geometry = null;
switch (type)
{
case "POINT":
geometry = ReadPointText(tokenizer);
break;
case "LINESTRING":
geometry = ReadLineStringText(tokenizer);
break;
case "MULTIPOINT":
geometry = ReadMultiPointText(tokenizer);
break;
case "MULTILINESTRING":
geometry = ReadMultiLineStringText(tokenizer);
break;
case "POLYGON":
geometry = ReadPolygonText(tokenizer);
break;
case "MULTIPOLYGON":
geometry = ReadMultiPolygonText(tokenizer);
break;
case "GEOMETRYCOLLECTION":
geometry = ReadGeometryCollectionText(tokenizer);
break;
default:
throw new Exception(String.Format(CultureInfo.InvariantCulture, "Geometrytype '{0}' is not supported.",
type));
}
return geometry;
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*PROJCS[
"OSGB 1936 / British National Grid",
GEOGCS[
"OSGB 1936",
DATUM[...]
PRIMEM[...]
AXIS["Geodetic latitude","NORTH"]
AXIS["Geodetic longitude","EAST"]
AUTHORITY["EPSG","4277"]
],
PROJECTION["Transverse Mercator"],
PARAMETER["latitude_of_natural_origin",49],
PARAMETER["longitude_of_natural_origin",-2],
PARAMETER["scale_factor_at_natural_origin",0.999601272],
PARAMETER["false_easting",400000],
PARAMETER["false_northing",-100000],
AXIS["Easting","EAST"],
AXIS["Northing","NORTH"],
AUTHORITY["EPSG","27700"]
]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("GEOGCS");
IGeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer);
tokenizer.ReadToken(",");
IProjection projection = ReadProjection(tokenizer);
IUnit unit = ReadLinearUnit(tokenizer);
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
List<AxisInfo> axes = new List<AxisInfo>(2);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
axes.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
//This is default axis values if not specified.
if (axes.Count == 0)
{
axes.Add(new AxisInfo("X", AxisOrientationEnum.East));
axes.Add(new AxisInfo("Y", AxisOrientationEnum.North));
}
IProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return projectedCS;
}