private void ParsePrefix(string s)
{
int startIndex = s.IndexOf('(');
int endIndex = s.LastIndexOf(')');
string prefix = startIndex == -1 ? s : s.Substring(0, startIndex);
HasZ = false;
HasM = false;
CoordinateCount = 2;
prefix = prefix.Trim().ToLower();
if (prefix.EndsWith(" z"))
{
HasZ = true;
CoordinateCount = 3;
}
if (prefix.EndsWith(" m"))
{
HasM = true;
CoordinateCount = 3;
}
if (prefix.EndsWith(" zm"))
{
HasM = true;
HasZ = true;
CoordinateCount = 4;
}
Type = WktType.None;
if (prefix.StartsWith("point"))
Type = WktType.Point;
if (prefix.StartsWith("linestring"))
Type = WktType.LineString;
if (prefix.StartsWith("polygon"))
Type = WktType.Polygon;
if (prefix.StartsWith("polyhedralsurface"))
Type = WktType.PolyhedralSurface;
if (prefix.StartsWith("triangle"))
Type = WktType.Triangle;
if (prefix.StartsWith("tin"))
Type = WktType.Tin;
if (prefix.StartsWith("multipoint"))
Type = WktType.MultiPoint;
if (prefix.StartsWith("multilinestring"))
Type = WktType.MultiLineString;
if (prefix.StartsWith("multipolygon"))
Type = WktType.MultiPolygon;
if (prefix.StartsWith("geometrycollection"))
Type = WktType.GeometryCollection;
Token = new WktToken(s, startIndex, endIndex);
}
private static IPoint BuildPoint(WktToken token, WktText wkt, ISpatialReference spatialReference)
{
var coordinates = token.Coords.ToArray();
int partCount = coordinates.Length;
if (!wkt.HasZ && !wkt.HasM && partCount != 2)
throw new ArgumentException("Mal-formed WKT, wrong number of elements, expecting x and y");
if (wkt.HasZ && !wkt.HasM && partCount != 3)
throw new ArgumentException("Mal-formed WKT, wrong number of elements, expecting x y z");
if (!wkt.HasZ && wkt.HasM && partCount != 3)
throw new ArgumentException("Mal-formed WKT, wrong number of elements, expecting x y m");
if (wkt.HasZ && wkt.HasM && partCount != 4)
throw new ArgumentException("Mal-formed WKT, wrong number of elements, expecting x y z m");
var point = (IPoint)new PointClass();
if (spatialReference != null)
point.SpatialReference = spatialReference;
point.PutCoords(coordinates[0], coordinates[1]);
if (wkt.HasZ)
point.Z = coordinates[2];
if (wkt.HasM && !wkt.HasZ)
point.M = coordinates[2];
if (wkt.HasZ && wkt.HasM)
point.M = coordinates[3];
MakeZmAware(point, wkt.HasZ, wkt.HasM);
return point;
}
private static IRing BuildRing(WktToken token, WktText wkt, ISpatialReference spatialReference)
{
var ring = (IPointCollection)new RingClass();
if (spatialReference != null)
((IGeometry)ring).SpatialReference = spatialReference;
foreach (var point in token.Tokens)
{
ring.AddPoint(BuildPoint(point, wkt, spatialReference));
}
MakeZmAware((IGeometry)ring, wkt.HasZ, wkt.HasM);
return (IRing)ring;
}
private static IPath BuildPath(WktToken token, WktText wkt, ISpatialReference spatialReference)
{
var path = (IPointCollection)new PathClass();
if (spatialReference != null)
((IGeometry)path).SpatialReference = spatialReference;
foreach (var point in token.Tokens)
{
path.AddPoint(BuildPoint(point, wkt, spatialReference));
}
var geometry = path as IGeometry;
MakeZmAware(geometry, wkt.HasZ, wkt.HasM);
return (IPath)path;
}
