1 // navrecord.cxx -- generic vor/dme/ndb class
3 // Written by Curtis Olson, started May 2004.
5 // Copyright (C) 2004 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 #include <simgear/misc/sgstream.hxx>
30 #include <simgear/structure/exception.hxx>
31 #include <simgear/misc/strutils.hxx>
32 #include <simgear/debug/logstream.hxx>
34 #include "Navaids/navrecord.hxx"
35 #include "Airports/simple.hxx"
36 #include "Airports/runways.hxx"
37 #include "Main/fg_props.hxx"
39 FGNavRecord::FGNavRecord(Type aTy, const std::string& aIdent,
40 const std::string& aName, const SGGeod& aPos,
41 int aFreq, int aRange, double aMultiuse) :
42 FGPositioned(aTy, aIdent, aPos),
50 initAirportRelation();
52 // Ranges are included with the latest data format, no need to
53 // assign our own defaults, unless the range is not set for some
56 SG_LOG(SG_GENERAL, SG_WARN, "navaid " << ident() << " has no range set, using defaults");
60 range = FG_NAV_DEFAULT_RANGE;
66 range = FG_LOC_DEFAULT_RANGE;
70 range = FG_DME_DEFAULT_RANGE;
74 range = FG_LOC_DEFAULT_RANGE;
80 static FGPositioned::Type
81 mapRobinTypeToFGPType(int aTy)
85 case 2: return FGPositioned::NDB;
86 case 3: return FGPositioned::VOR;
87 case 4: return FGPositioned::LOC;
88 case 5: return FGPositioned::ILS;
89 case 6: return FGPositioned::GS;
90 case 7: return FGPositioned::OM;
91 case 8: return FGPositioned::MM;
92 case 9: return FGPositioned::IM;
94 case 13: return FGPositioned::DME;
95 case 99: return FGPositioned::INVALID; // end-of-file code
97 throw sg_range_exception("Got a nav.dat type we don't recognize", "FGNavRecord::createFromStream");
101 FGNavRecord* FGNavRecord::createFromStream(std::istream& aStream)
106 return NULL; // happens with, eg, carrier_nav.dat
109 Type type = mapRobinTypeToFGPType(rawType);
110 if (type == INVALID) return NULL;
112 double lat, lon, elev_ft, multiuse;
114 std::string name, ident;
115 aStream >> lat >> lon >> elev_ft >> freq >> range >> multiuse >> ident;
116 getline(aStream, name);
118 // silently multiply adf frequencies by 100 so that adf
119 // vs. nav/loc frequency lookups can use the same code.
124 // ensure marker beacons are anonymous, so they don't get added to the
126 if ((type >= OM) && (type <= IM)) {
130 FGNavRecord* result = new FGNavRecord(type, ident,
131 simgear::strutils::strip(name), SGGeod::fromDegFt(lon, lat, elev_ft),
132 freq, range, multiuse);
137 void FGNavRecord::initAirportRelation()
139 if ((type() < ILS) || (type() > IM)) {
140 return; // not airport-located
143 vector<string> parts = simgear::strutils::split(_name);
144 if (parts.size() < 2) {
145 SG_LOG(SG_GENERAL, SG_WARN, "navaid has malformed name:" << _name);
149 const FGAirport* apt = fgFindAirportID(parts[0]);
152 SG_LOG(SG_GENERAL, SG_WARN, "navaid " << _name << " associated with bogus airport ID:" << parts[0]);
156 runway = apt->getRunwayByIdent(parts[1]);
158 SG_LOG(SG_GENERAL, SG_WARN, "navaid " << _name << " associated with bogus runway ID:" << parts[1]);
162 // fudge elevation to the field elevation if it's not specified
163 if (fabs(elevation()) < 0.01) {
164 mPosition.setElevationFt(apt->getElevation());
167 // align localizers with their runway
168 if ((type() == ILS) || (type() == LOC)) {
169 if (!fgGetBool("/sim/navdb/localizers/auto-align", true)) {
174 = fgGetDouble( "/sim/navdb/localizers/auto-align-threshold-deg", 5.0 );
175 alignLocaliserWithRunway(runway, threshold);
179 void FGNavRecord::alignLocaliserWithRunway(FGRunway* aRunway, double aThreshold)
181 // find the distance from the threshold to the localizer
182 SGGeod runwayThreshold(aRunway->threshold());
183 double dist, az1, az2;
184 SGGeodesy::inverse(mPosition, runwayThreshold, az1, az2, dist);
186 // back project that distance along the runway center line
187 SGGeod newPos = aRunway->pointOnCenterline(dist);
189 double hdg_diff = get_multiuse() - aRunway->headingDeg();
191 // clamp to [-180.0 ... 180.0]
192 if ( hdg_diff < -180.0 ) {
194 } else if ( hdg_diff > 180.0 ) {
198 if ( fabs(hdg_diff) <= aThreshold ) {
200 set_multiuse( aRunway->headingDeg() );
202 SG_LOG(SG_GENERAL, SG_WARN, "localizer:" << ident() << ", aligning with runway "
203 << aRunway->ident() << " exceeded heading threshold");
207 FGTACANRecord::FGTACANRecord(void) :
215 operator >> ( std::istream& in, FGTACANRecord& n )
217 in >> n.channel >> n.freq ;
218 //getline( in, n.name );