/// <summary>
/// Writes a GeoJson from the database
/// </summary>
/// <param name="db">The database</param>
/// <param name="geojFile">the filename to write to</param>
/// <returns>True ??!!</returns>
public bool WriteGeoJson(navDatabase db, Stream geojOutStream,
double rangeLimitNm = -1.0, double Lat = 0, double Lon = 0, NavTypes[] navTypes = null)
{
/*
* {
* "type": "FeatureCollection",
* "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
* "features": [
* entry, entry
* ]
* }
*/
string head = $"{{\n\"type\": \"FeatureCollection\",\n" +
$"\"crs\": {{ \"type\": \"name\", \"properties\": {{ \"name\": \"urn:ogc:def:crs:OGC:1.3:CRS84\" }} }}," +
$"\"features\": [";
string foot = $"]\n}}";
using (var sw = new StreamWriter(geojOutStream, Encoding.UTF8)) {
sw.WriteLine(head);
if (rangeLimitNm > 0)
{
WriteFile(sw, db.GetSubtable(rangeLimitNm, Lat, Lon, navTypes));
}
else
{
WriteFile(sw, db.GetTable( ));
}
sw.WriteLine(foot);
}
return(true);
}
/// <summary>
/// Reads one file to fill the db
/// </summary>
/// <param name="db">The navDatabase to fill</param>
/// <param name="fName">The qualified filename</param>
/// <returns>The result string, either empty or error</returns>
private static string ReadDbFile(ref navDatabase db, string fName)
{
var icaoPre = Path.GetFileNameWithoutExtension(fName);
string ret = "";
using (var sr = new StreamReader(fName)) {
string buffer = sr.ReadLine( ); // header line
buffer = sr.ReadLine( ); // header line 2
buffer = sr.ReadLine( );
while (!sr.EndOfStream)
{
if (buffer.StartsWith("99"))
{
break;
}
var rec = FromNative(buffer);
if (rec != null && rec.IsValid)
{
ret += db.Add(rec); // collect adding information
}
buffer = sr.ReadLine( );
}
//
}
return(ret);
}
/// <summary>
/// Reads the XPlane 11 earth_nav.dat file and populates the supplied database
/// </summary>
/// <param name="db">The navDatabase to fill</param>
/// <param name="fName">The file to read</param>
/// <returns>The result string, either empty or error</returns>
public static string ReadDb(ref navDatabase db, string fName)
{
if (!File.Exists(fName))
{
return($"File does not exist\n");
}
return(ReadDbFile(ref db, fName));
}
