/// <summary>
/// Constructs a coordinate system object from well-known text.
/// </summary>
/// <param name="wkt">Well-known text representation of object</param>
/// <returns>An object constructed from well-known text</returns>
/// <exception cref="System.ArgumentException">Raises when parsing of string fails.</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 recognized.", objectName));
}
reader.Close();
return returnObject;
}
private static ICoordinate readPointCoords(WktStreamTokenizer tokenizer)
{
ICoordinate point = PlanimetryEnvironment.NewCoordinate(0, 0);
tokenizer.NextToken();
point.X = tokenizer.GetNumericValue();
tokenizer.NextToken();
point.Y = tokenizer.GetNumericValue();
return point;
}
private static List<ICoordinate> readPointCoordsList(WktStreamTokenizer tokenizer)
{
List<ICoordinate> points = new List<ICoordinate>();
bool comma = true;
while(comma)
{
points.Add(readPointCoords(tokenizer));
tokenizer.NextToken();
comma = tokenizer.GetStringValue() == ",";
}
return points;
}
private static List<List<ICoordinate>> readPointsCoordLists(WktStreamTokenizer tokenizer)
{
List<List<ICoordinate>> result = new List<List<ICoordinate>>();
bool comma = true;
while (comma)
{
tokenizer.ReadToken("(");
result.Add(readPointCoordsList(tokenizer));
if (tokenizer.GetStringValue() == ")")
{
tokenizer.NextToken();
comma = tokenizer.GetStringValue() == ",";
}
else
throwMissingCloseBracket(tokenizer);
}
return result;
}
private static Polygon readMultiPolygon(WktStreamTokenizer tokenizer)
{
tokenizer.ReadToken("(");
Polygon polygon = new Polygon();
bool comma = true;
while (comma)
{
tokenizer.ReadToken("(");
List<List<ICoordinate>> lists = readPointsCoordLists(tokenizer);
if (tokenizer.GetStringValue() == ")")
{
foreach (List<ICoordinate> list in lists)
{
Contour contour = new Contour();
list.RemoveAt(list.Count - 1);
contour.Vertices = list;
polygon.Contours.Add(contour);
}
}
else
throwMissingCloseBracket(tokenizer);
tokenizer.NextToken();
comma = tokenizer.GetStringValue() == ",";
}
if (tokenizer.GetStringValue() != ")")
throwMissingCloseBracket(tokenizer);
return polygon;
}
private static MultiPoint readMultiPoint(WktStreamTokenizer tokenizer)
{
tokenizer.ReadToken("(");
List<ICoordinate> points = new List<ICoordinate>();
while (true)
{
points.Add(readPoint(tokenizer).Coordinate);
tokenizer.NextToken(true);
if (tokenizer.GetStringValue() == ",")
continue;
if (tokenizer.GetStringValue() == ")")
break;
}
if (tokenizer.GetStringValue() == ")")
{
MultiPoint multiPoint = new MultiPoint(points);
return multiPoint;
}
else
throwMissingCloseBracket(tokenizer);
return null;
}
/// <summary>
/// Constructs a geometry from its well-known text representation.
/// </summary>
/// <returns>A constructed geometry</returns>
public static IGeometry GeometryFromWKT(string wkt)
{
StringReader sr = new StringReader(wkt);
WktStreamTokenizer tokenizer = new WktStreamTokenizer(sr);
tokenizer.NextToken();
switch (tokenizer.GetStringValue().ToUpper())
{
case "POINT": return readPoint(tokenizer);
case "LINESTRING": return readLineString(tokenizer);
case "MULTILINESTRING": return readMultiLineString(tokenizer);
case "POLYGON": return readPolygon(tokenizer);
case "MULTIPOLYGON": return readMultiPolygon(tokenizer);
case "MULTIPOINT": return readMultiPoint(tokenizer);
}
throw new ArgumentException(string.Format("Unknown geometry \"{0}\"", tokenizer.GetStringValue()));
}
/// <summary>
/// Reads a unit.
/// </summary>
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);
ReadAuthority(tokenizer, ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
return new Unit(unitsPerUnit, unitName, authority, authorityCode, String.Empty, String.Empty, String.Empty);
}
/// <summary>
/// Reads a prime meridian.
/// </summary>
private static IPrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
{
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() == ",")
{
ReadAuthority(tokenizer, ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
IPrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return primeMeridian;
}
/// <summary>
/// Reads a geographic coordinate system.
/// </summary>
private static IGeographicCoordinateSystem ReadGeographicCoordinateSystem(WktStreamTokenizer tokenizer)
{
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() == ",") tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == ",") tokenizer.NextToken();
if (tokenizer.GetStringValue() == "AUTHORITY")
{
//tokenizer.ReadAuthority(ref authority, ref authorityCode);
ReadAuthority(tokenizer, ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
// значения по умолчанию для осей
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>
/// Reads a horizontal datum.
/// </summary>
private static IHorizontalDatum ReadHorizontalDatum(WktStreamTokenizer tokenizer)
{
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);
ReadAuthority(tokenizer, ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
IHorizontalDatum horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, DatumType.HD_Geocentric, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return horizontalDatum;
}
/// <summary>
/// Reads a projected coordinate system.
/// </summary>
private static IProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
{
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() == ",") tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == ",") tokenizer.NextToken();
if (tokenizer.GetStringValue() == "AUTHORITY")
{
//tokenizer.ReadAuthority(ref authority, ref authorityCode);
ReadAuthority(tokenizer, 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>
/// Reads a projection.
/// </summary>
private static IProjection ReadProjection(WktStreamTokenizer tokenizer)
{
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>
///
/// </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>
/// Reads an ellipsiod.
/// </summary>
private static IEllipsoid ReadEllipsoid(WktStreamTokenizer tokenizer)
{
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);
ReadAuthority(tokenizer, 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>
/// Reads a WGS84 conversion info.
/// </summary>
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>
/// Reads an axis info.
/// </summary>
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(CultureInfo.InvariantCulture))
{
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");
}
}