/// <summary>
/// Writes out a GeographyLineString value in geojson format.
/// {
/// "__metadata": {"type": "Edm.GeographyLineString"},
/// { "type" :"LineString",
/// "coordinates": { [-122.1202778,47.6741667] } ,
/// "crs":{"type":"name","properties":{"name":"EPSG:4326"}}
/// }
/// }
/// </summary>
/// <param name="geographyLineStringValue">The geography value to serialize into Json</param>
/// <param name="writer">The Json writer being used to write out a Json payload</param>
private static void WriteGeographyLineString(GeographyLineString lineString, JsonWriter writer)
{
// {
writer.StartObjectScope();
// "__metadata":
writer.WriteName(JsonMetadataString);
// {
writer.StartObjectScope();
// "type"
writer.WriteName(JsonTypeString);
// "Edm.GeographyLineString"
writer.WriteValue(Gml_Edm_GeographyLineStringName);
// }
writer.EndScope();
// "type":"LineString",
writer.WriteName(JsonTypeString);
writer.WriteValue(GmlLineString);
// "coordinates":
writer.WriteName(JsonCoOrdinatesString);
// [
writer.StartArrayScope();
foreach (var point in lineString.Points)
{
WritePointCoordinates(writer, point);
}
// ]
writer.EndScope();
// "crs": {"type": "name", "properties": {"name": "EPSG:4326"}}
WriteCrsElement(writer, lineString.CoordinateSystem.EpsgId);
// }
writer.EndScope();
}
/// <summary>
/// Writes out the Co-ordinate reference system element in JSON
/// http://en.wikipedia.org/wiki/Coordinate_reference_system
/// </summary>
/// <param name="writer">The Json Writer being used to write out the results.</param>
/// <param name="epsgId">the EpsgId value to serialize</param>
private static void WriteCrsElement(JsonWriter writer, int? epsgId)
{
// "crs"
writer.WriteName(JsonCrsString);
// {
writer.StartObjectScope();
// "type"
writer.WriteName(JsonTypeString);
// :"name"
writer.WriteValue(JsonNameString);
// "properties"
writer.WriteName(PropertiesElementName);
// : {
writer.StartObjectScope();
// "name":
writer.WriteName(JsonNameString);
string epsgidValue = epsgId.HasValue ? epsgId.Value.ToString() : "0";
// "EPSG:<EpsgIdValue>"
writer.WriteValue(String.Format(JsonEPSGValueStringFormat, epsgidValue));
// }
writer.EndScope();
// }
writer.EndScope();
}
/// <summary>
/// Writes out a geography point's Co-ordinates in JSON
/// </summary>
/// <param name="writer">The Json Writer being used to write out the results.</param>
/// <param name="point">The Point to serialize into JSON</param>
private static void WritePointCoordinates(JsonWriter writer, GeographyPoint point)
{
writer.StartArrayScope();
writer.WriteValue(point.Longitude);
writer.WriteValue(point.Latitude);
writer.EndScope();
}
/// <summary>
/// Writes out a GeographyPoint value in geojson format.
/// {
/// "__metadata":{"type":"Edm.GeographyPoint"},
/// "type":"Point",
/// "coordinates":[Lattitude,Longitude],
/// "crs":{"type":"name","properties":{"name":"EPSG:EPSGValue"}}
/// }
/// </summary>
/// <param name="geographyLineStringValue">The geography value to serialize into Json</param>
/// <param name="writer">The Json writer being used to write out a Json payload</param>
private static void WriteGeographyPoint(GeographyPoint point, JsonWriter writer)
{
// see http://geojson.org/geojson-spec.html#id9
// {
writer.StartObjectScope();
// "__metadata":
writer.WriteName(JsonMetadataString);
// {
writer.StartObjectScope();
// "type"
writer.WriteName(JsonTypeString);
// "Edm.GeographyPoint"
writer.WriteValue(Gml_Edm_GeographyPointName);
// }
writer.EndScope();
// "type":"Point",
writer.WriteName(JsonTypeString);
writer.WriteValue(GmlPoint);
// "coordinates":[-122.1202778,47.6741667],
writer.WriteName(JsonCoOrdinatesString);
WritePointCoordinates(writer, point);
// "crs": {"type": "name", "properties": {"name": "EPSG:4326"}}
WriteCrsElement(writer, point.CoordinateSystem.EpsgId);
// }
writer.EndScope();
}