/// <summary>
/// Returns a subtable with items that match the given criteria
/// </summary>
/// <param name="rangeLimitNm">Range Limit in nm</param>
/// <param name="Lat">Center Lat (decimal)</param>
/// <param name="Lon">Center Lon (decimal)</param>
/// <returns>A table with selected records</returns>
public awyTable GetSubtable(navDatabase ndb, double rangeLimitNm = -1.0, double Lat = 0, double Lon = 0)
{
var nT = new awyTable( );
// Navs and Fixes in range
var NAVTAB = ndb.GetSubtable(rangeLimitNm, Lat, Lon);
// for each item in NDB get the airway(s) that is using it
foreach (var rec in NAVTAB)
{
var AWYTAB = this.GetSubtable(rec.Key);
// for each item then find it's counterpart and write an airway segment
foreach (var awRec in AWYTAB)
{
// expected layer (hi or lo)
if (rec.Key == awRec.Value.startID)
{
if (ndb.GetTable( ).ContainsKey(awRec.Value.startID) && ndb.GetTable( ).ContainsKey(awRec.Value.endID))
{
var endNav = ndb.GetTable( )[awRec.Value.endID];
if (!nT.ContainsKey(awRec.Key))
{
nT.Add(awRec.Key, awRec.Value);
}
}
}
else if (rec.Key == awRec.Value.endID)
{
if (ndb.GetTable( ).ContainsKey(awRec.Value.startID) && ndb.GetTable( ).ContainsKey(awRec.Value.endID))
{
var startNav = ndb.GetTable( )[awRec.Value.endID];
if (!nT.ContainsKey(awRec.Key))
{
nT.Add(awRec.Key, awRec.Value);
}
}
}
else
{
; //ERROR - DEBUG BREAK
}
}
}
return(nT);
}
private HashSet <string> m_trackedMarkers = new HashSet <string>( ); // track written Markers
/// <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(awyDatabase db, navDatabase ndb, Stream geojOutStream,
string layer,
double rangeLimitNm = -1.0, double Lat = 0, double Lon = 0)
{
/*
* {
* "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)) {
bool doComma = false; // pesty last comma avoidance...
sw.WriteLine(head);
// Navs and Fixes in range
var NAVTAB = ndb.GetSubtable(rangeLimitNm, Lat, Lon);
// for each item in NDB get the airway(s) that is using it
foreach (var rec in NAVTAB)
{
var AWYTAB = db.GetSubtable(rec.Key);
// for each item then find it's counterpart and write an airway segment
foreach (var awRec in AWYTAB)
{
if (awRec.Value.layer == layer)
{
// expected layer (hi or lo)
if (rec.Key == awRec.Value.startID)
{
var endNav = ndb.GetTable( )[awRec.Value.endID];
if (!m_trackedMarkers.Contains(rec.Value.ident))
{
m_trackedMarkers.Add(rec.Value.ident);
}
if (!m_trackedMarkers.Contains(endNav.ident))
{
m_trackedMarkers.Add(endNav.ident);
}
sw.WriteLine((doComma ? "," : "") + awRec.Value.AsGeoJson(rec.Value.lat, rec.Value.lon, endNav.lat, endNav.lon));
doComma = true; // after the first line prepend records with comma
}
else if (rec.Key == awRec.Value.endID)
{
var startNav = ndb.GetTable( )[awRec.Value.endID];
if (!m_trackedMarkers.Contains(startNav.ident))
{
m_trackedMarkers.Add(startNav.ident);
}
if (!m_trackedMarkers.Contains(rec.Value.ident))
{
m_trackedMarkers.Add(rec.Value.ident);
}
sw.WriteLine((doComma ? "," : "") + awRec.Value.AsGeoJson(startNav.lat, startNav.lon, rec.Value.lat, rec.Value.lon));
doComma = true; // after the first line prepend records with comma
}
else
{
; //ERROR - DEBUG BREAK
}
}
}
}
sw.WriteLine(foot);
}
return(true);
}