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Added a function to return the closest ATC station of a given type

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daveluff 2003-03-11 13:24:35 +00:00
parent 2908bd995d
commit 0333c21bbf
2 changed files with 57 additions and 0 deletions
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46
src/ATC/commlist.cxx
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@ -209,6 +209,52 @@ int FGCommList::FindByPos(double lon, double lat, double elev, double range, com
}
// Returns the distance in meters to the closest station of a given type,
// with the details written into ATCData& ad. If no type is specifed simply
// returns the distance to the closest station of any type.
// Returns -9999 if no stations found within max_range in nautical miles (default 100 miles).
// Note that the search algorithm starts at 10 miles and multiplies by 10 thereafter, so if
// say 300 miles is specifed 10, then 100, then 1000 will be searched, breaking at first result
// and giving up after 1000.
double FGCommList::FindClosest( double lon, double lat, double elev, ATCData& ad, atc_type tp, double max_range) {
int num_stations = 0;
int range = 10;
comm_list_type stations;
comm_list_iterator itr;
double distance = -9999.0;
while(num_stations == 0) {
num_stations = FindByPos(lon, lat, elev, range, &stations, tp);
if(num_stations) {
double closest = max_range * SG_NM_TO_METER;
double tmp;
for(itr = stations.begin(); itr != stations.end(); ++itr) {
ATCData ad2 = *itr;
//Point3D p1(*itr.lon, *itr.lat, *itr.elev);
Point3D p1(ad2.lon, ad2.lat, ad2.elev);
FGAirport a;
if(dclFindAirportID(ad2.ident, &a)) {
Point3D p2(lon, lat, elev);
tmp = dclGetHorizontalSeparation(p1, p2);
if(tmp <= closest) {
closest = tmp;
distance = tmp;
ad = *itr;
}
}
}
//cout << "Closest station is " << ad.ident << " at a range of " << distance << " meters\n";
return(distance);
}
if(range > max_range) {
break;
}
range *= 10;
}
return(-9999.0);
}
// Find by Airport code.
// This is basically a wrapper for a call to the airport database to get the airport
// position followed by a call to FindByPos(...)

11
src/ATC/commlist.hxx
View file

@ -84,6 +84,17 @@ public:
// ** stations is erased before use **
int FindByPos( double lon, double lat, double elev, double range, comm_list_type* stations, atc_type tp = INVALID );
// Returns the distance in meters to the closest station of a given type,
// with the details written into ATCData& ad. If no type is specifed simply
// returns the distance to the closest station of any type.
// Returns -9999 if no stations found within max_range in nautical miles (default 100 miles).
// Note that the search algorithm starts at 10 miles and multiplies by 10 thereafter, so if
// say 300 miles is specifed 10, then 100, then 1000 will be searched, breaking at first result
// and giving up after 1000.
// !!!Be warned that searching anything over 100 miles will pause the sim unacceptably!!!
// (The ability to search longer ranges should be used during init only).
double FindClosest( double lon, double lat, double elev, ATCData& ad, atc_type tp = INVALID, double max_range = 100.0 );
// Find by Airport code.
bool FindByCode( string ICAO, ATCData& ad, atc_type tp = INVALID );