//
// Written by Curtis Olson, started April 2000.
//
-// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
+// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
# include <config.h>
#endif
+#include <boost/foreach.hpp>
+#include <algorithm>
+
#include <simgear/debug/logstream.hxx>
-#include <simgear/misc/sgstream.hxx>
#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/sg_inlines.h>
#include "navlist.hxx"
+#include <Airports/runways.hxx>
-FGNavList *current_navlist;
+using std::string;
+namespace { // anonymous
-// Constructor
-FGNavList::FGNavList( void ) {
+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;
+
+};
+
+} // of anonymous namespace
+
+// FGNavList ------------------------------------------------------------------
+
+
+FGNavList::TypeFilter::TypeFilter(const FGPositioned::Type type)
+{
+ if (type == FGPositioned::INVALID) {
+ _mintype = FGPositioned::VOR;
+ _maxtype = FGPositioned::GS;
+ } else {
+ _mintype = _maxtype = type;
+ }
}
-// Destructor
-FGNavList::~FGNavList( void ) {
+FGNavList::FGNavList( void )
+{
}
-// load the navaids and build the map
-bool FGNavList::init( SGPath path ) {
-
+FGNavList::~FGNavList( void )
+{
+ nav_list_type navlist = navaids.begin()->second;
navaids.erase( navaids.begin(), navaids.end() );
+}
- sg_gzifstream in( path.str() );
- if ( !in.is_open() ) {
- SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
- exit(-1);
- }
- // read in each line of the file
+// load the navaids and build the map
+bool FGNavList::init()
+{
+ // 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() );
+ return true;
+}
- in >> skipeol;
- in >> skipcomment;
+// add an entry to the lists
+bool FGNavList::add( FGNavRecord *n )
+{
+ navaids[n->get_freq()].push_back(n);
+ return true;
+}
- // double min = 100000;
- // double max = 0;
+FGNavRecord *FGNavList::findByFreq( double freq, const SGGeod& position)
+{
+ const nav_list_type& stations = navaids[(int)(freq*100.0 + 0.5)];
+ SG_LOG( SG_INSTR, SG_DEBUG, "findbyFreq " << freq << " size " << stations.size() );
+ return findNavFromList( position, stations );
+}
-#ifdef __MWERKS__
- char c = 0;
- while ( in.get(c) && c != '\0' ) {
- in.putback(c);
-#else
- while ( ! in.eof() ) {
-#endif
+nav_list_type FGNavList::findAllByFreq( double freq, const SGGeod& position, const FGPositioned::Type type)
+{
+ nav_list_type stations;
+ TypeFilter filter(type);
+
+ BOOST_FOREACH(nav_rec_ptr nav, navaids[(int)(freq*100.0 + 0.5)]) {
+ if (filter.pass(nav.ptr())) {
+ stations.push_back(nav);
+ }
+ }
+
+ NavRecordDistanceSortPredicate sortPredicate( position );
+ std::sort( stations.begin(), stations.end(), sortPredicate );
+ return stations;
+}
- FGNav *n = new FGNav;
- in >> (*n);
- if ( n->get_type() == '[' ) {
- break;
- }
- /* cout << "id = " << n.get_ident() << endl;
- cout << " type = " << n.get_type() << endl;
- cout << " lon = " << n.get_lon() << endl;
- cout << " lat = " << n.get_lat() << endl;
- cout << " elev = " << n.get_elev() << endl;
- cout << " freq = " << n.get_freq() << endl;
- cout << " range = " << n.get_range() << endl << endl; */
-
- navaids [n->get_freq() ].push_back(n);
- ident_navaids[n->get_ident()].push_back(n);
-
- in >> skipcomment;
-
- /* if ( n.get_type() != 'N' ) {
- if ( n.get_freq() < min ) {
- min = n.get_freq();
- }
- if ( n.get_freq() > max ) {
- max = n.get_freq();
- }
- } */
+// Given an Ident and optional frequency, return the first matching
+// station.
+const nav_list_type FGNavList::findByIdentAndFreq(const string& ident, const double freq, const FGPositioned::Type type )
+{
+ FGPositionedRef cur;
+ TypeFilter filter(type);
+ nav_list_type reply;
+
+ cur = FGPositioned::findNextWithPartialId(cur, ident, &filter);
+
+ int f = (int)(freq*100.0 + 0.5);
+ while (cur) {
+ FGNavRecord* nav = static_cast<FGNavRecord*>(cur.ptr());
+ if ( f <= 0.0 || nav->get_freq() == f) {
+ reply.push_back( nav );
}
+
+ cur = FGPositioned::findNextWithPartialId(cur, ident, &filter);
+ }
- // cout << "min freq = " << min << endl;
- // cout << "max freq = " << max << endl;
-
- return true;
+ return reply;
}
-
-// Query the database for the specified frequency. It is assumed that
-// there will be multiple stations with matching frequencies so a
-// position must be specified. Lon and lat are in degrees, elev is in
-// meters.
-FGNav *FGNavList::findByFreq( double freq, double lon, double lat, double elev )
+// Given an Ident and optional frequency and type ,
+// return a list of matching stations sorted by distance to the given position
+const nav_list_type FGNavList::findByIdentAndFreq( const SGGeod & position,
+ const std::string& ident, const double freq, const FGPositioned::Type type )
{
- nav_list_type stations = navaids[(int)(freq*100.0 + 0.5)];
- Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
+ nav_list_type reply = findByIdentAndFreq( ident, freq, type );
+ NavRecordDistanceSortPredicate sortPredicate( position );
+ std::sort( reply.begin(), reply.end(), sortPredicate );
- return findNavFromList( aircraft, stations );
+ return reply;
}
+// 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.
+static 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);
+}
-FGNav *FGNavList::findByIdent( const char* ident,
- const double lon, const double lat )
+// Given a point and a list of stations, return the closest one to
+// the specified point.
+FGNavRecord* FGNavList::findNavFromList( const SGGeod &aircraft,
+ const nav_list_type &stations )
{
- nav_list_type stations = ident_navaids[ident];
- Point3D aircraft = sgGeodToCart( Point3D(lon, lat, 0.0) );
+ 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;
+ SGVec3d aircraftCart = SGVec3d::fromGeod(aircraft);
+
+ 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;
+ d2 = distSqr(station->cart(), aircraftCart);
+ if ( d2 > min_dist || !navidUsable(station, aircraft)) {
+ continue;
+ }
+
+ min_dist = d2;
+ nav = station;
+ }
- return findNavFromList( aircraft, stations );
+ return nav;
}
+// Given a frequency, return the first matching station.
+FGNavRecord *FGNavList::findStationByFreq( double freq )
+{
+ const nav_list_type& stations = navaids[(int)(freq*100.0 + 0.5)];
+
+ SG_LOG( SG_INSTR, SG_DEBUG, "findStationByFreq " << freq << " size " << stations.size() );
-// Given an Ident and optional freqency, return the first matching
-// station.
-FGNav *FGNavList::findByIdentAndFreq( const char* ident, const double freq )
-{
- nav_list_type stations = ident_navaids[ident];
-
- 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);
- for ( unsigned int i = 0; i < stations.size(); ++i ) {
- if ( f == stations[i]->get_freq() ) {
- return stations[i];
- }
- }
- } else {
+ if (!stations.empty()) {
return stations[0];
}
-
return NULL;
}
-// Given a point and a list of stations, return the closest one to the
-// specified point.
-FGNav *FGNavList::findNavFromList( const Point3D &aircraft,
- const nav_list_type &stations )
+
+// FGTACANList ----------------------------------------------------------------
+
+FGTACANList::FGTACANList( void )
{
- FGNav *nav = NULL;
- Point3D station;
- double d2;
- double min_dist = 999999999.0;
+}
+
+
+FGTACANList::~FGTACANList( void )
+{
+}
- // prime the pump with info from stations[0]
- if ( stations.size() > 0 ) {
- nav = stations[0];
- station = Point3D( nav->get_x(), nav->get_y(), nav->get_z());
- min_dist = aircraft.distance3Dsquared( station );
- }
- // check if any of the remaining stations are closer
- for ( unsigned int i = 1; i < stations.size(); ++i ) {
- // cout << "testing " << current->get_ident() << endl;
- station = Point3D( stations[i]->get_x(),
- stations[i]->get_y(),
- stations[i]->get_z() );
+bool FGTACANList::init()
+{
+ return true;
+}
- d2 = aircraft.distance3Dsquared( station );
- // cout << " dist = " << sqrt(d)
- // << " range = " << current->get_range() * SG_NM_TO_METER
- // << endl;
+// add an entry to the lists
+bool FGTACANList::add( FGTACANRecord *c )
+{
+ ident_channels[c->get_channel()].push_back(c);
+ return true;
+}
- if ( d2 < min_dist ) {
- min_dist = d2;
- nav = stations[i];
- }
- }
- return nav;
+// Given a TACAN Channel return the first matching frequency
+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() );
+
+ if (!stations.empty()) {
+ return stations[0];
+ }
+ return NULL;
}
+
+
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