X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FNavaids%2Fnavlist.cxx;h=9b0c911dee50c44c274532495c78113a9252fb5d;hb=9c467af6bf2f04ddaae2d7937ce6d4b547ab099b;hp=1f19f626a81708528d9a7dfd1323da6a132cb492;hpb=bb2b03c7e392e107aeaf7dbc4eecc59064b28512;p=flightgear.git diff --git a/src/Navaids/navlist.cxx b/src/Navaids/navlist.cxx index 1f19f626a..9b0c911de 100644 --- a/src/Navaids/navlist.cxx +++ b/src/Navaids/navlist.cxx @@ -25,390 +25,274 @@ # include #endif +#include +#include +#include + #include -#include #include +#include #include "navlist.hxx" +#include +#include +#include -// Return true if the nav record matches the type -static bool isTypeMatch(const FGNavRecord* n, fg_nav_types type) -{ - if (type == FG_NAV_ANY) return true; - return type == n->type(); -} - +using std::string; +namespace { // anonymous -// FGNavList ------------------------------------------------------------------ +class NavRecordDistanceSortPredicate +{ +public: + NavRecordDistanceSortPredicate( const SGGeod & position ) : + _position(SGVec3d::fromGeod(position)) {} + + bool operator()( const nav_rec_ptr & n1, const nav_rec_ptr & n2 ) + { + if( n1 == NULL || n2 == NULL ) return false; + return distSqr(n1->cart(), _position) < distSqr(n2->cart(), _position); + } +private: + SGVec3d _position; + +}; -FGNavList::FGNavList( void ) +// discount navids if they conflict with another on the same frequency +// this only applies to navids associated with opposite ends of a runway, +// with matching frequencies. +bool navidUsable(FGNavRecord* aNav, const SGGeod &aircraft) { + FGRunway* r(aNav->runway()); + if (!r || !r->reciprocalRunway()) { + return true; + } + + // check if the runway frequency is paired + FGNavRecord* locA = r->ILS(); + FGNavRecord* locB = r->reciprocalRunway()->ILS(); + + if (!locA || !locB || (locA->get_freq() != locB->get_freq())) { + return true; // not paired, ok + } + + // okay, both ends have an ILS, and they're paired. We need to select based on + // aircraft position. What we're going to use is *runway* (not navid) position, + // ie whichever runway end we are closer too. This makes back-course / missed + // approach behaviour incorrect, but that's the price we accept. + double crs = SGGeodesy::courseDeg(aircraft, r->geod()); + double hdgDiff = crs - r->headingDeg(); + SG_NORMALIZE_RANGE(hdgDiff, -180.0, 180.0); + return (fabs(hdgDiff) < 90.0); } + +} // of anonymous namespace + +// FGNavList ------------------------------------------------------------------ -FGNavList::~FGNavList( void ) +//------------------------------------------------------------------------------ +FGNavList::TypeFilter::TypeFilter(const FGPositioned::Type type) { - navaids_by_tile.erase( navaids_by_tile.begin(), navaids_by_tile.end() ); - nav_list_type navlist = navaids.begin()->second; - navaids.erase( navaids.begin(), navaids.end() ); + if (type == FGPositioned::INVALID) { + _mintype = FGPositioned::NDB; + _maxtype = FGPositioned::GS; + } else { + _mintype = _maxtype = type; + } } - -// load the navaids and build the map -bool FGNavList::init() +//------------------------------------------------------------------------------ +FGNavList::TypeFilter::TypeFilter( const FGPositioned::Type minType, + const FGPositioned::Type maxType ): + _mintype(minType), + _maxtype(maxType) { - // No need to delete the original navaid structures - // since we're using an SGSharedPointer - nav_list_type navlist = navaids.begin()->second; - navaids.erase( navaids.begin(), navaids.end() ); - navaids_by_tile.erase( navaids_by_tile.begin(), navaids_by_tile.end() ); - ident_navaids.erase( ident_navaids.begin(), ident_navaids.end() ); - - return true; } - -// real add a marker beacon -static void real_add( nav_map_type &navmap, const int master_index, - FGNavRecord *n ) +//------------------------------------------------------------------------------ +bool FGNavList::TypeFilter::fromTypeString(const std::string& type) { - navmap[master_index].push_back( n ); + FGPositioned::Type t; + if( type == "any" ) t = FGPositioned::INVALID; + else if( type == "fix" ) t = FGPositioned::FIX; + else if( type == "vor" ) t = FGPositioned::VOR; + else if( type == "ndb" ) t = FGPositioned::NDB; + else if( type == "ils" ) t = FGPositioned::ILS; + else if( type == "dme" ) t = FGPositioned::DME; + else if( type == "tacan") t = FGPositioned::TACAN; + else return false; + + _mintype = _maxtype = t; + + return true; } - -// front end for add a marker beacon -static void tile_add( nav_map_type &navmap, FGNavRecord *n ) +/** + * Filter returning Tacan stations. Checks for both pure TACAN stations + * but also co-located VORTACs. This is done by searching for DMEs whose + * name indicates they are a TACAN or VORTAC; not a great solution. + */ +class TacanFilter : public FGNavList::TypeFilter { - double diff = 0; - - double lon = n->get_lon(); - double lat = n->get_lat(); - - int lonidx = (int)lon; - diff = lon - (double)lonidx; - if ( (lon < 0.0) && (fabs(diff) > SG_EPSILON) ) { - lonidx -= 1; +public: + TacanFilter() : + TypeFilter(FGPositioned::DME, FGPositioned::TACAN) + { + } + + virtual bool pass(FGPositioned* pos) const + { + if (pos->type() == FGPositioned::TACAN) { + return true; } - double lonfrac = lon - (double)lonidx; - lonidx += 180; + + assert(pos->type() == FGPositioned::DME); + string::size_type loc1 = pos->name().find( "TACAN" ); + string::size_type loc2 = pos->name().find( "VORTAC" ); + return (loc1 != string::npos) || (loc2 != string::npos); + } +}; - int latidx = (int)lat; - diff = lat - (double)latidx; - if ( (lat < 0.0) && (fabs(diff) > SG_EPSILON) ) { - latidx -= 1; - } - double latfrac = lat - (double)latidx; - latidx += 90; - - int master_index = lonidx * 1000 + latidx; - // cout << "lonidx = " << lonidx << " latidx = " << latidx << " "; - // cout << "Master index = " << master_index << endl; - - // add to the actual bucket - real_add( navmap, master_index, n ); - - // if we are close to the edge, add to adjacent buckets so we only - // have to search one bucket at run time - - // there are 8 cases since there are 8 adjacent tiles - - if ( lonfrac < 0.2 ) { - real_add( navmap, master_index - 1000, n ); - if ( latfrac < 0.2 ) { - real_add( navmap, master_index - 1000 - 1, n ); - } else if ( latfrac > 0.8 ) { - real_add( navmap, master_index - 1000 + 1, n ); - } - } else if ( lonfrac > 0.8 ) { - real_add( navmap, master_index + 1000, n ); - if ( latfrac < 0.2 ) { - real_add( navmap, master_index + 1000 - 1, n ); - } else if ( latfrac > 0.8 ) { - real_add( navmap, master_index + 1000 + 1, n ); - } - } else if ( latfrac < 0.2 ) { - real_add( navmap, master_index - 1, n ); - } else if ( latfrac > 0.8 ) { - real_add( navmap, master_index + 1, n ); - } +FGNavList::TypeFilter* FGNavList::locFilter() +{ + static TypeFilter tf(FGPositioned::ILS, FGPositioned::LOC); + return &tf; } - -// add an entry to the lists -bool FGNavList::add( FGNavRecord *n ) +FGNavList::TypeFilter* FGNavList::ndbFilter() { - navaids[n->get_freq()].push_back(n); - ident_navaids[n->get_ident()].push_back(n); - tile_add( navaids_by_tile, n ); - return true; + static TypeFilter tf(FGPositioned::NDB); + return &tf; } - -FGNavRecord *FGNavList::findByFreq( double freq, double lon, double lat, double elev ) +FGNavList::TypeFilter* FGNavList::navFilter() { - const nav_list_type& stations = navaids[(int)(freq*100.0 + 0.5)]; - - SGGeod geod = SGGeod::fromRadM(lon, lat, elev); - SGVec3d aircraft = SGVec3d::fromGeod(geod); - SG_LOG( SG_INSTR, SG_DEBUG, "findbyFreq " << freq << " size " << stations.size() ); - - return findNavFromList( aircraft, stations ); + static TypeFilter tf(FGPositioned::VOR, FGPositioned::LOC); + return &tf; } - -FGNavRecord *FGNavList::findByIdent( const char* ident, - const double lon, const double lat ) +FGNavList::TypeFilter* FGNavList::tacanFilter() { - const nav_list_type& stations = ident_navaids[ident]; - SGGeod geod = SGGeod::fromRad(lon, lat); - SGVec3d aircraft = SGVec3d::fromGeod(geod); - return findNavFromList( aircraft, stations ); + static TacanFilter tf; + return &tf; } - -nav_list_type FGNavList::findFirstByIdent( const string& ident, fg_nav_types type, bool exact) +FGNavList::TypeFilter* FGNavList::mobileTacanFilter() { - nav_list_type n2; - n2.clear(); + static TypeFilter tf(FGPositioned::MOBILE_TACAN); + return &tf; +} - if ((type != FG_NAV_VOR) && (type != FG_NAV_NDB)) { - return n2; +FGNavRecordRef FGNavList::findByFreq( double freq, + const SGGeod& position, + TypeFilter* filter ) +{ + flightgear::NavDataCache* cache = flightgear::NavDataCache::instance(); + int freqKhz = static_cast(freq * 100 + 0.5); + PositionedIDVec stations(cache->findNavaidsByFreq(freqKhz, position, filter)); + if (stations.empty()) { + return NULL; } - nav_ident_map_iterator it; - if(exact) { - it = ident_navaids.find(ident); - } else { - bool typeMatch = false; - int safety_count = 0; - it = ident_navaids.lower_bound(ident); - while(!typeMatch) { - nav_list_type n0 = it->second; - // local copy, so we should be able to do anything with n0. - // Remove the types that don't match request. - for(nav_list_iterator it0 = n0.begin(); it0 != n0.end();) { - FGNavRecord* nv = *it0; - if(nv->type() == type) { - typeMatch = true; - ++it0; - } else { - it0 = n0.erase(it0); - } - } - if(typeMatch) { - return(n0); - } - if(it == ident_navaids.begin()) { - // We didn't find a match before reaching the beginning of the map - n0.clear(); - return(n0); - } - safety_count++; - if(safety_count == 1000000) { - SG_LOG(SG_INSTR, SG_ALERT, - "safety_count triggered exit from while loop in findFirstByIdent!"); - break; - } - ++it; - if(it == ident_navaids.end()) { - n0.clear(); - return(n0); - } - } +// now walk the (sorted) results list to find a usable, in-range navaid + SGVec3d acCart(SGVec3d::fromGeod(position)); + double min_dist + = FG_NAV_MAX_RANGE*SG_NM_TO_METER*FG_NAV_MAX_RANGE*SG_NM_TO_METER; + + BOOST_FOREACH(PositionedID id, stations) { + FGNavRecordRef station = FGPositioned::loadById(id); + if (!filter->pass(station)) { + continue; + } + + double d2 = distSqr(station->cart(), acCart); + if (d2 > min_dist) { + // since results are sorted by proximity, as soon as we pass the + // distance cutoff we're done - fall out and return NULL + break; } - if(it == ident_navaids.end()) { - n2.clear(); - return(n2); - } else { - nav_list_type n1 = it->second; - n2.clear(); - for(nav_list_iterator it2 = n1.begin(); it2 != n1.end(); ++it2) { - FGNavRecord* nv = *it2; - if(nv->type() == type) n2.push_back(nv); - } - return(n2); + + if (navidUsable(station, position)) { + return station; } + } + +// fell out of the loop, no usable match + return NULL; } - -// Given an Ident and optional freqency, return the first matching -// station. -FGNavRecord *FGNavList::findByIdentAndFreq( const char* ident, const double freq ) +FGNavRecordRef FGNavList::findByFreq(double freq, TypeFilter* filter) { - nav_list_type stations = ident_navaids[ident]; - SG_LOG( SG_INSTR, SG_DEBUG, "findByIdent " << ident<< " size " << stations.size() ); - if ( freq > 0.0 ) { - // sometimes there can be duplicated idents. If a freq is - // specified, use it to refine the search. - int f = (int)(freq*100.0 + 0.5); - nav_list_const_iterator it, end = stations.end(); - for ( it = stations.begin(); it != end; ++it ) { - if ( f == (*it)->get_freq() ) { - return (*it); - } - } - } else if (!stations.empty()) { - return stations[0]; + flightgear::NavDataCache* cache = flightgear::NavDataCache::instance(); + int freqKhz = static_cast(freq * 100 + 0.5); + PositionedIDVec stations(cache->findNavaidsByFreq(freqKhz, filter)); + if (stations.empty()) { + return NULL; + } + + BOOST_FOREACH(PositionedID id, stations) { + FGNavRecordRef station = FGPositioned::loadById(id); + if (filter->pass(station)) { + return station; } + } - return NULL; + return NULL; } -// LOC, ILS, GS, and DME antenna's could potentially be -// installed at the opposite end of the runway. So it's not -// enough to simply find the closest antenna with the right -// frequency. We need the closest antenna with the right -// frequency that is most oriented towards us. (We penalize -// stations that are facing away from us by adding 5000 meters -// which is further than matching stations would ever be -// placed from each other. (Do the expensive check only for -// directional atennas and only when there is a chance it is -// the closest station.) - -static bool penaltyForNav(FGNavRecord* aNav, const SGVec3d &aPos) +nav_list_type FGNavList::findAllByFreq( double freq, const SGGeod& position, + TypeFilter* filter) { - switch (aNav->type()) { - case FGPositioned::ILS: - case FGPositioned::LOC: - case FGPositioned::GS: -// FIXME -// case FGPositioned::DME: we can't get the heading for a DME transmitter, oops - break; - default: - return false; - } + nav_list_type stations; - double hdg_deg = 0.0; - if (aNav->type() == FGPositioned::GS) { - int tmp = (int)(aNav->get_multiuse() / 1000.0); - hdg_deg = aNav->get_multiuse() - (tmp * 1000); - } else { - hdg_deg = aNav->get_multiuse(); - } - - double az1 = 0.0, az2 = 0.0, s = 0.0; - SGGeod geod = SGGeod::fromCart(aPos); - geo_inverse_wgs_84( geod, aNav->geod(), &az1, &az2, &s); - az1 = az1 - hdg_deg; - - if ( az1 > 180.0) az1 -= 360.0; - if ( az1 < -180.0) az1 += 360.0; + flightgear::NavDataCache* cache = flightgear::NavDataCache::instance(); + int freqKhz = static_cast(freq * 1000 + 0.5); + PositionedIDVec ids(cache->findNavaidsByFreq(freqKhz, position, filter)); - return fabs(az1 > 90.0); -} - -// Given a point and a list of stations, return the closest one to the -// specified point. -FGNavRecord *FGNavList::findNavFromList( const SGVec3d &aircraft, - const nav_list_type &stations ) -{ - FGNavRecord *nav = NULL; - double d2; // in meters squared - double min_dist - = FG_NAV_MAX_RANGE*SG_NM_TO_METER*FG_NAV_MAX_RANGE*SG_NM_TO_METER; - - nav_list_const_iterator it; - nav_list_const_iterator end = stations.end(); - // find the closest station within a sensible range (FG_NAV_MAX_RANGE) - for ( it = stations.begin(); it != end; ++it ) { - FGNavRecord *station = *it; - // cout << "testing " << current->get_ident() << endl; - d2 = distSqr(station->get_cart(), aircraft); - if ( d2 < min_dist && penaltyForNav(station, aircraft)) - { - double dist = sqrt(d2); - d2 = (dist + 5000) * (dist + 5000); - } - - if ( d2 < min_dist ) { - min_dist = d2; - nav = station; - } + BOOST_FOREACH(PositionedID id, ids) { + FGNavRecordRef station = FGPositioned::loadById(id); + if (!filter->pass(station)) { + continue; } - return nav; + stations.push_back(station); + } + + return stations; } - -// returns the closest entry to the give lon/lat/elev -FGNavRecord *FGNavList::findClosest( double lon_rad, double lat_rad, - double elev_m, fg_nav_types type) +nav_list_type FGNavList::findByIdentAndFreq(const string& ident, const double freq, + TypeFilter* filter) { - FGNavRecord *result = NULL; - double diff; - - double lon_deg = lon_rad * SG_RADIANS_TO_DEGREES; - double lat_deg = lat_rad * SG_RADIANS_TO_DEGREES; - int lonidx = (int)lon_deg; - diff = lon_deg - (double)lonidx; - if ( (lon_deg < 0.0) && (fabs(diff) > SG_EPSILON) ) { - lonidx -= 1; - } - lonidx += 180; - - int latidx = (int)lat_deg; - diff = lat_deg - (double)latidx; - if ( (lat_deg < 0.0) && (fabs(diff) > SG_EPSILON) ) { - latidx -= 1; - } - latidx += 90; - - int master_index = lonidx * 1000 + latidx; - - const nav_list_type& navs = navaids_by_tile[ master_index ]; - // cout << "Master index = " << master_index << endl; - // cout << "beacon search length = " << beacons.size() << endl; - - nav_list_const_iterator current = navs.begin(); - nav_list_const_iterator last = navs.end(); - - SGGeod geod = SGGeod::fromRadM(lon_rad, lat_rad, elev_m); - SGVec3d aircraft = SGVec3d::fromGeod(geod); - - double min_dist = 999999999.0; - - for ( ; current != last ; ++current ) { - if(isTypeMatch(*current, type)) { - // cout << " testing " << (*current)->get_ident() << endl; - - double d = distSqr((*current)->get_cart(), aircraft); - // cout << " distance = " << d << " (" - // << FG_ILS_DEFAULT_RANGE * SG_NM_TO_METER - // * FG_ILS_DEFAULT_RANGE * SG_NM_TO_METER - // << ")" << endl; - - // cout << " range = " << sqrt(d) << endl; - - if ( d < min_dist ) { - min_dist = d; - result = (*current); - } - } + nav_list_type reply; + int f = (int)(freq*100.0 + 0.5); + + FGPositionedList stations = FGPositioned::findAllWithIdent(ident, filter); + BOOST_FOREACH(FGPositionedRef ref, stations) { + FGNavRecord* nav = static_cast(ref.ptr()); + if ( f <= 0.0 || nav->get_freq() == f) { + reply.push_back( nav ); } + } - // cout << "lon = " << lon << " lat = " << lat - // << " closest beacon = " << sqrt( min_dist ) << endl; - - return result; + return reply; } -// Given a frequency, return the first matching station. -FGNavRecord *FGNavList::findStationByFreq( double freq ) +// Given an Ident and optional frequency and type , +// return a list of matching stations sorted by distance to the given position +nav_list_type FGNavList::findByIdentAndFreq( const SGGeod & position, + const std::string& ident, const double freq, + TypeFilter* filter) { - const nav_list_type& stations = navaids[(int)(freq*100.0 + 0.5)]; + nav_list_type reply = findByIdentAndFreq( ident, freq, filter ); + NavRecordDistanceSortPredicate sortPredicate( position ); + std::sort( reply.begin(), reply.end(), sortPredicate ); - SG_LOG( SG_INSTR, SG_DEBUG, "findStationByFreq " << freq << " size " << stations.size() ); - - if (!stations.empty()) { - return stations[0]; - } - return NULL; + return reply; } - - // FGTACANList ---------------------------------------------------------------- FGTACANList::FGTACANList( void ) @@ -439,7 +323,7 @@ bool FGTACANList::add( FGTACANRecord *c ) FGTACANRecord *FGTACANList::findByChannel( const string& channel ) { const tacan_list_type& stations = ident_channels[channel]; - SG_LOG( SG_INSTR, SG_DEBUG, "findByChannel " << channel<< " size " << stations.size() ); + SG_LOG( SG_NAVAID, SG_DEBUG, "findByChannel " << channel<< " size " << stations.size() ); if (!stations.empty()) { return stations[0];