+FGRunway* FGAirport::getActiveRunwayForUsage() const
+{
+ static FGEnvironmentMgr* envMgr = NULL;
+ if (!envMgr) {
+ envMgr = (FGEnvironmentMgr *) globals->get_subsystem("environment");
+ }
+
+ FGEnvironment stationWeather(envMgr->getEnvironment(mPosition));
+
+ double windSpeed = stationWeather.get_wind_speed_kt();
+ double hdg = stationWeather.get_wind_from_heading_deg();
+ if (windSpeed <= 0.0) {
+ hdg = 270; // This forces West-facing rwys to be used in no-wind situations
+ // which is consistent with Flightgear's initial setup.
+ }
+
+ return findBestRunwayForHeading(hdg);
+}
+
+FGAirport* FGAirport::findClosest(const SGGeod& aPos, double aCuttofNm, Filter* filter)
+{
+ AirportFilter aptFilter;
+ if (filter == NULL) {
+ filter = &aptFilter;
+ }
+
+ FGPositionedRef r = FGPositioned::findClosest(aPos, aCuttofNm, filter);
+ if (!r) {
+ return NULL;
+ }
+
+ return static_cast<FGAirport*>(r.ptr());
+}
+
+FGAirport::HardSurfaceFilter::HardSurfaceFilter(double minLengthFt) :
+ mMinLengthFt(minLengthFt)
+{
+}
+
+bool FGAirport::HardSurfaceFilter::passAirport(FGAirport* aApt) const
+{
+ return aApt->hasHardRunwayOfLengthFt(mMinLengthFt);
+}
+
+FGAirport* FGAirport::findByIdent(const std::string& aIdent)
+{
+ FGPositionedRef r;
+ PortsFilter filter;
+ r = FGPositioned::findNextWithPartialId(r, aIdent, &filter);
+ if (!r) {
+ return NULL; // we don't warn here, let the caller do that
+ }
+ return static_cast<FGAirport*>(r.ptr());
+}
+
+FGAirport* FGAirport::getByIdent(const std::string& aIdent)
+{
+ FGPositionedRef r;
+ PortsFilter filter;
+ r = FGPositioned::findNextWithPartialId(r, aIdent, &filter);
+ if (!r) {
+ throw sg_range_exception("No such airport with ident: " + aIdent);
+ }
+ return static_cast<FGAirport*>(r.ptr());
+}
+
+char** FGAirport::searchNamesAndIdents(const std::string& aFilter)
+{
+ // we delegate all the work to a horrible helper in FGPositioned, which can
+ // access the (private) index data.
+ return searchAirportNamesAndIdents(aFilter);
+}
+
+// find basic airport location info from airport database
+const FGAirport *fgFindAirportID( const string& id)
+{
+ if ( id.empty() ) {
+ return NULL;
+ }
+
+ return FGAirport::findByIdent(id);
+}
+
+void FGAirport::loadRunways() const
+{
+ if (mRunwaysLoaded) {
+ return; // already loaded, great
+ }
+
+ mRunwaysLoaded = true;
+ loadSceneryDefintions();
+}
+
+void FGAirport::loadTaxiways() const
+{
+ if (mTaxiwaysLoaded) {
+ return; // already loaded, great
+ }
+}
+
+void FGAirport::loadSceneryDefintions() const
+{
+ // allow users to disable the scenery data in the short-term
+ // longer term, this option can probably disappear
+ if (!fgGetBool("/sim/use-scenery-airport-data")) {
+ return;
+ }
+
+ SGPath path;
+ SGPropertyNode_ptr rootNode = new SGPropertyNode;
+ if (XMLLoader::findAirportData(ident(), "threshold", path)) {
+ readProperties(path.str(), rootNode);
+ const_cast<FGAirport*>(this)->readThresholdData(rootNode);
+ }
+
+ // repeat for the tower data
+ rootNode = new SGPropertyNode;
+ if (XMLLoader::findAirportData(ident(), "twr", path)) {
+ readProperties(path.str(), rootNode);
+ const_cast<FGAirport*>(this)->readTowerData(rootNode);
+ }
+}
+
+void FGAirport::readThresholdData(SGPropertyNode* aRoot)
+{
+ SGPropertyNode* runway;
+ int runwayIndex = 0;
+ for (; (runway = aRoot->getChild("runway", runwayIndex)) != NULL; ++runwayIndex) {
+ SGPropertyNode* t0 = runway->getChild("threshold", 0),
+ *t1 = runway->getChild("threshold", 1);
+ assert(t0);
+ assert(t1); // too strict? mayeb we should finally allow single-ended runways
+
+ processThreshold(t0);
+ processThreshold(t1);
+ } // of runways iteration
+}
+
+void FGAirport::processThreshold(SGPropertyNode* aThreshold)
+{
+ // first, let's identify the current runway
+ string id(aThreshold->getStringValue("rwy"));
+ if (!hasRunwayWithIdent(id)) {
+ SG_LOG(SG_GENERAL, SG_WARN, "FGAirport::processThreshold: "
+ "found runway not defined in the global data:" << ident() << "/" << id);
+ return;
+ }
+
+ FGRunway* rwy = getRunwayByIdent(id);
+ rwy->processThreshold(aThreshold);
+}
+
+void FGAirport::readTowerData(SGPropertyNode* aRoot)
+{
+ SGPropertyNode* twrNode = aRoot->getChild("tower")->getChild("twr");
+ double lat = twrNode->getDoubleValue("lat"),
+ lon = twrNode->getDoubleValue("lon"),
+ elevM = twrNode->getDoubleValue("elev-m");
+
+ _tower_location = SGGeod::fromDegM(lon, lat, elevM);
+}
+
+// get airport elevation
+double fgGetAirportElev( const string& id )
+{
+ const FGAirport *a=fgFindAirportID( id);
+ if (a) {
+ return a->getElevation();
+ } else {
+ return -9999.0;
+ }
+}
+
+
+// get airport position
+SGGeod fgGetAirportPos( const string& id )
+{
+ const FGAirport *a = fgFindAirportID( id);
+
+ if (a) {
+ return SGGeod::fromDegM(a->getLongitude(), a->getLatitude(), a->getElevation());
+ } else {
+ return SGGeod::fromDegM(0.0, 0.0, -9999.0);
+ }