-// navaids.cxx -- navaids management class
+// navlist.cxx -- navaids management class
//
// 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.
//
// $Id$
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <cassert>
+#include <boost/foreach.hpp>
+#include <algorithm>
+
#include <simgear/debug/logstream.hxx>
-#include <simgear/misc/fgstream.hxx>
#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/sg_inlines.h>
#include "navlist.hxx"
+#include <Airports/runways.hxx>
+#include <Navaids/NavDataCache.hxx>
+#include <Navaids/navrecord.hxx>
-FGNavList *current_navlist;
+using std::string;
+namespace { // anonymous
+
+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;
+
+};
-// Constructor
-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 ------------------------------------------------------------------
-// Destructor
-FGNavList::~FGNavList( void ) {
+
+//------------------------------------------------------------------------------
+FGNavList::TypeFilter::TypeFilter(const FGPositioned::Type type)
+{
+ if (type == FGPositioned::INVALID) {
+ _mintype = FGPositioned::NDB;
+ _maxtype = FGPositioned::GS;
+ } else {
+ _mintype = _maxtype = type;
+ }
}
+//------------------------------------------------------------------------------
+FGNavList::TypeFilter::TypeFilter( const FGPositioned::Type minType,
+ const FGPositioned::Type maxType ):
+ _mintype(minType),
+ _maxtype(maxType)
+{
+}
+
+//------------------------------------------------------------------------------
+bool FGNavList::TypeFilter::fromTypeString(const std::string& type)
+{
+ 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;
-// load the navaids and build the map
-bool FGNavList::init( FGPath path ) {
- FGNav n;
+ _mintype = _maxtype = t;
- navaids.erase( navaids.begin(), navaids.end() );
+ return true;
+}
- fg_gzifstream in( path.str() );
- if ( !in.is_open() ) {
- FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << path.str() );
- exit(-1);
+/**
+ * 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
+{
+public:
+ TacanFilter() :
+ TypeFilter(FGPositioned::DME, FGPositioned::TACAN)
+ {
+ }
+
+ virtual bool pass(FGPositioned* pos) const
+ {
+ if (pos->type() == FGPositioned::TACAN) {
+ return true;
}
+
+ 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);
+ }
+};
- // read in each line of the file
+FGNavList::TypeFilter* FGNavList::locFilter()
+{
+ static TypeFilter tf(FGPositioned::ILS, FGPositioned::LOC);
+ return &tf;
+}
- in >> skipeol;
- in >> skipcomment;
+FGNavList::TypeFilter* FGNavList::ndbFilter()
+{
+ static TypeFilter tf(FGPositioned::NDB);
+ return &tf;
+}
+
+FGNavList::TypeFilter* FGNavList::navFilter()
+{
+ static TypeFilter tf(FGPositioned::VOR, FGPositioned::LOC);
+ return &tf;
+}
+
+FGNavList::TypeFilter* FGNavList::tacanFilter()
+{
+ static TacanFilter tf;
+ return &tf;
+}
-#ifdef __MWERKS__
+FGNavList::TypeFilter* FGNavList::mobileTacanFilter()
+{
+ static TypeFilter tf(FGPositioned::MOBILE_TACAN);
+ return &tf;
+}
- char c = 0;
- while ( in.get(c) && c != '\0' && n.get_type() != '[' ) {
- in.putback(c);
- in >> n;
- if ( n.get_type() != '[' ) {
- navaids[n.get_freq()].push_back(n);
- }
- in >> skipcomment;
+FGNavRecordRef FGNavList::findByFreq( double freq,
+ const SGGeod& position,
+ TypeFilter* filter )
+{
+ flightgear::NavDataCache* cache = flightgear::NavDataCache::instance();
+ int freqKhz = static_cast<int>(freq * 100 + 0.5);
+ PositionedIDVec stations(cache->findNavaidsByFreq(freqKhz, position, filter));
+ if (stations.empty()) {
+ return NULL;
+ }
+
+// 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<FGNavRecord>(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 (navidUsable(station, position)) {
+ return station;
+ }
+ }
+
+// fell out of the loop, no usable match
+ return NULL;
+}
+
+FGNavRecordRef FGNavList::findByFreq(double freq, TypeFilter* filter)
+{
+ flightgear::NavDataCache* cache = flightgear::NavDataCache::instance();
+ int freqKhz = static_cast<int>(freq * 100 + 0.5);
+ PositionedIDVec stations(cache->findNavaidsByFreq(freqKhz, filter));
+ if (stations.empty()) {
+ return NULL;
+ }
-#else
-
- double min = 100000;
- double max = 0;
-
- while ( ! in.eof() && n.get_type() != '[' ) {
- in >> n;
- /* 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; */
- if ( n.get_type() != '[' ) {
- navaids[n.get_freq()].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();
- }
- }
+ BOOST_FOREACH(PositionedID id, stations) {
+ FGNavRecordRef station = FGPositioned::loadById<FGNavRecord>(id);
+ if (filter->pass(station)) {
+ return station;
}
+ }
- // cout << "min freq = " << min << endl;
- // cout << "max freq = " << max << endl;
+ return NULL;
+}
-#endif
+nav_list_type FGNavList::findAllByFreq( double freq, const SGGeod& position,
+ TypeFilter* filter)
+{
+ nav_list_type stations;
+
+ flightgear::NavDataCache* cache = flightgear::NavDataCache::instance();
+ int freqKhz = static_cast<int>(freq * 1000 + 0.5);
+ PositionedIDVec ids(cache->findNavaidsByFreq(freqKhz, position, filter));
+
+ BOOST_FOREACH(PositionedID id, ids) {
+ FGNavRecordRef station = FGPositioned::loadById<FGNavRecord>(id);
+ if (!filter->pass(station)) {
+ continue;
+ }
- return true;
+ stations.push_back(station);
+ }
+
+ return stations;
}
+nav_list_type FGNavList::findByIdentAndFreq(const string& ident, const double freq,
+ TypeFilter* filter)
+{
+ 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<FGNavRecord*>(ref.ptr());
+ if ( f <= 0.0 || nav->get_freq() == f) {
+ reply.push_back( nav );
+ }
+ }
+
+ return reply;
+}
-// query the database for the specified frequency, lon and lat are in
-// degrees, elev is in meters
-bool FGNavList::query( double lon, double lat, double elev, double freq,
- FGNav *n )
+// 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)
{
- 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 );
+
+ return reply;
+}
- nav_list_iterator current = stations.begin();
- nav_list_iterator last = stations.end();
+// FGTACANList ----------------------------------------------------------------
- // double az1, az2, s;
- Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
- Point3D station;
- double d;
- for ( ; current != last ; ++current ) {
- // cout << "testing " << current->get_ident() << endl;
- station = Point3D(current->get_x(), current->get_y(), current->get_z());
+FGTACANList::FGTACANList( void )
+{
+}
- d = aircraft.distance3Dsquared( station );
- // cout << " dist = " << sqrt(d)
- // << " range = " << current->get_range() * NM_TO_METER << endl;
- if ( d < (current->get_range() * NM_TO_METER
- * current->get_range() * NM_TO_METER * 5.0) ) {
- // cout << "matched = " << current->get_ident() << endl;
- *n = *current;
- return true;
- }
- }
+FGTACANList::~FGTACANList( void )
+{
+}
- return false;
+
+bool FGTACANList::init()
+{
+ return true;
+}
+
+
+// add an entry to the lists
+bool FGTACANList::add( FGTACANRecord *c )
+{
+ ident_channels[c->get_channel()].push_back(c);
+ return true;
}
+
+
+// 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_NAVAID, SG_DEBUG, "findByChannel " << channel<< " size " << stations.size() );
+
+ if (!stations.empty()) {
+ return stations[0];
+ }
+ return NULL;
+}
+
+
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