public static CartesianPoint FromWellKnownText(string wkt)
{
using var tokenizer = new WellKnownTextTokenizer(new StringReader(wkt));
var token = tokenizer.NextToken();
if (token != TokenType.Word)
{
throw new GeoWKTException(
$"Expected word but found {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
var type = tokenizer.TokenValue.ToUpperInvariant();
if (type != GeoShapeType.Point)
{
throw new GeoWKTException(
$"Expected {GeoShapeType.Point} but found {type}", tokenizer.LineNumber, tokenizer.Position);
}
if (GeoWKTReader.NextEmptyOrOpen(tokenizer) == TokenType.Word)
{
return(null);
}
var x = Convert.ToSingle(GeoWKTReader.NextNumber(tokenizer));
var y = Convert.ToSingle(GeoWKTReader.NextNumber(tokenizer));
// ignore any z value for now
if (GeoWKTReader.IsNumberNext(tokenizer))
{
GeoWKTReader.NextNumber(tokenizer);
}
var point = new CartesianPoint(x, y)
{
Format = ShapeFormat.WellKnownText
};
GeoWKTReader.NextCloser(tokenizer);
return(point);
}
public GeoLocation Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
{
switch (reader.GetCurrentJsonToken())
{
case JsonToken.Null:
reader.ReadNext();
return(null);
case JsonToken.String:
var wkt = reader.ReadString();
using (var tokenizer = new WellKnownTextTokenizer(new StringReader(wkt)))
{
var token = tokenizer.NextToken();
if (token != TokenType.Word)
{
throw new GeoWKTException(
$"Expected word but found {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
var type = tokenizer.TokenValue.ToUpperInvariant();
if (type != GeoShapeType.Point)
{
throw new GeoWKTException(
$"Expected {GeoShapeType.Point} but found {type}", tokenizer.LineNumber, tokenizer.Position);
}
if (GeoWKTReader.NextEmptyOrOpen(tokenizer) == TokenType.Word)
{
return(null);
}
var lon = GeoWKTReader.NextNumber(tokenizer);
var lat = GeoWKTReader.NextNumber(tokenizer);
return(new GeoLocation(lat, lon)
{
Format = GeoFormat.WellKnownText
});
}
default:
{
var count = 0;
double lat = 0;
double lon = 0;
while (reader.ReadIsInObject(ref count))
{
var propertyName = reader.ReadPropertyNameSegmentRaw();
if (Fields.TryGetValue(propertyName, out var value))
{
switch (value)
{
case 0:
lat = reader.ReadDouble();
break;
case 1:
lon = reader.ReadDouble();
break;
}
}
else
{
reader.ReadNextBlock();
}
}
return(new GeoLocation(lat, lon)
{
Format = GeoFormat.GeoJson
});
}
}
}