-// 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 <simgear/debug/logstream.hxx>
-#include <simgear/misc/fgstream.hxx>
-#include <simgear/math/fg_geodesy.hxx>
+#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/sg_inlines.h>
#include "navlist.hxx"
+using std::string;
-// Constructor
-FGNavaids::FGNavaids( void ) {
+// FGNavList ------------------------------------------------------------------
+
+FGNavList::FGNavList( void )
+{
}
-// Destructor
-FGNavaids::~FGNavaids( void ) {
+FGNavList::~FGNavList( void )
+{
+ nav_list_type navlist = navaids.begin()->second;
+ navaids.erase( navaids.begin(), navaids.end() );
}
// load the navaids and build the map
-bool FGNavaids::init( FGPath path ) {
- FGNavaid n;
-
+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;
+}
- fg_gzifstream in( path.str() );
- if ( !in.is_open() ) {
- FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << path.str() );
- exit(-1);
- }
+// add an entry to the lists
+bool FGNavList::add( FGNavRecord *n )
+{
+ navaids[n->get_freq()].push_back(n);
+ return true;
+}
- // read in each line of the file
+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 );
+}
- in >> skipeol;
- in >> skipcomment;
+class VORNDBFilter : public FGPositioned::Filter
+{
+public:
+ virtual bool pass(FGPositioned* aPos) const
+ {
+ return (aPos->type() == FGPositioned::VOR) || (aPos->type() == FGPositioned::NDB);
+ }
+};
+
+// Given an Ident and optional freqency, return the first matching
+// station.
+FGNavRecord *FGNavList::findByIdentAndFreq(const string& ident, const double freq )
+{
+ FGPositionedRef cur;
+ VORNDBFilter filter;
+ cur = FGPositioned::findNextWithPartialId(cur, ident, &filter);
+
+ if (freq <= 0.0) {
+ return static_cast<FGNavRecord*>(cur.ptr()); // might be null
+ }
+
+ int f = (int)(freq*100.0 + 0.5);
+ while (cur) {
+ FGNavRecord* nav = static_cast<FGNavRecord*>(cur.ptr());
+ if (nav->get_freq() == f) {
+ return nav;
+ }
+
+ cur = FGPositioned::findNextWithPartialId(cur, ident, &filter);
+ }
-#ifdef __MWERKS__
+ return NULL;
+}
- 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;
+// 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 SGGeod &aGeod)
+{
+ 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;
+ }
+
+ 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, az2, s;
+ SGGeodesy::inverse(aGeod, aNav->geod(), az1, az2, s);
+ az1 = az1 - hdg_deg;
+ SG_NORMALIZE_RANGE(az1, -180.0, 180.0);
+ 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 SGGeod &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;
+ 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;
+ // cout << "testing " << current->get_ident() << endl;
+ d2 = distSqr(station->cart(), aircraftCart);
+ 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;
+ }
}
-#else
-
- 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;
+ 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() );
+
+ if (!stations.empty()) {
+ return stations[0];
}
+ return NULL;
+}
+
+
+
+// FGTACANList ----------------------------------------------------------------
+
+FGTACANList::FGTACANList( void )
+{
+}
+
+
+FGTACANList::~FGTACANList( void )
+{
+}
-#endif
+bool FGTACANList::init()
+{
return true;
}
-// query the database for the specified frequency, lon and lat are in
-// degrees, elev is in meters
-bool FGNavaids::query( double lon, double lat, double elev, double freq,
- FGNavaid *n, double *heading, double *dist )
+// add an entry to the lists
+bool FGTACANList::add( FGTACANRecord *c )
{
- nav_list_type stations = navaids[(int)(freq*100.0)];
-
- nav_list_iterator current = stations.begin();
- nav_list_iterator last = stations.end();
-
- double az1, az2, s;
- for ( ; current != last ; ++current ) {
- // cout << "testing " << current->get_ident() << endl;
- geo_inverse_wgs_84( elev, lat, lon,
- current->get_lat(), current->get_lon(),
- &az1, &az2, &s );
- // cout << " dist = " << s << endl;
- if ( s < ( current->get_range() * NM_TO_METER ) ) {
- *n = *current;
- *heading = az2;
- *dist = s;
- return true;
- }
- }
+ ident_channels[c->get_channel()].push_back(c);
+ return true;
+}
- return false;
+
+// 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;
}
+
+
projects / flightgear.git / blobdiff