-// navaids.cxx -- navaids management class
+// navlist.cxx -- navaids management class
//
// Written by Curtis Olson, started April 2000.
//
// $Id$
+#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/misc/sgstream.hxx>
+#include <simgear/math/sg_geodesy.hxx>
#include "navlist.hxx"
// load the navaids and build the map
-bool FGNavList::init( FGPath path ) {
- FGNav n;
+bool FGNavList::init( SGPath path ) {
navaids.erase( navaids.begin(), navaids.end() );
- fg_gzifstream in( path.str() );
+ sg_gzifstream in( path.str() );
if ( !in.is_open() ) {
- FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << path.str() );
+ SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
exit(-1);
}
in >> skipeol;
in >> skipcomment;
-#ifdef __MWERKS__
+ // double min = 100000;
+ // double max = 0;
+#ifdef __MWERKS__
char c = 0;
- while ( in.get(c) && c != '\0' && n.get_type() != '[' ) {
+ while ( in.get(c) && c != '\0' ) {
in.putback(c);
- in >> n;
- if ( n.get_type() != '[' ) {
- navaids[n.get_freq()].push_back(n);
- }
- in >> skipcomment;
- }
-
#else
+ while ( ! in.eof() ) {
+#endif
- double min = 100000;
- double max = 0;
+ FGNav *n = new FGNav;
+ in >> (*n);
+ if ( n->get_type() == '[' ) {
+ break;
+ }
- 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);
- }
+ 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_type() != 'N' ) {
if ( n.get_freq() < min ) {
min = n.get_freq();
}
if ( n.get_freq() > max ) {
max = n.get_freq();
}
- }
+ } */
}
// cout << "min freq = " << min << endl;
// cout << "max freq = " << max << endl;
-#endif
-
return true;
}
-// 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 )
+// 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 )
{
nav_list_type stations = navaids[(int)(freq*100.0 + 0.5)];
+ Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
+
+ return findNavFromList( aircraft, stations );
+}
+
- nav_list_iterator current = stations.begin();
- nav_list_iterator last = stations.end();
+FGNav *FGNavList::findByIdent( const char* ident,
+ const double lon, const double lat )
+{
+ nav_list_type stations = ident_navaids[ident];
+ Point3D aircraft = sgGeodToCart( Point3D(lon, lat, 0.0) );
+
+ return findNavFromList( aircraft, stations );
+}
+
+
+// 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 {
+ return stations[0];
+ }
- // double az1, az2, s;
- Point3D aircraft = fgGeodToCart( Point3D(lon, lat, elev) );
+ 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 )
+{
+ FGNav *nav = NULL;
Point3D station;
- double d;
- for ( ; current != last ; ++current ) {
+ double d2;
+ double min_dist = 999999999.0;
+
+ // 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(current->get_x(), current->get_y(), current->get_z());
+ station = Point3D( stations[i]->get_x(),
+ stations[i]->get_y(),
+ stations[i]->get_z() );
+
+ d2 = aircraft.distance3Dsquared( station );
- d = aircraft.distance3Dsquared( station );
+ // cout << " dist = " << sqrt(d)
+ // << " range = " << current->get_range() * SG_NM_TO_METER
+ // << endl;
- // cout << " dist = " << s << endl;
- if ( d < (current->get_range() * NM_TO_METER
- * current->get_range() * NM_TO_METER) ) {
- *n = *current;
- return true;
- }
+ if ( d2 < min_dist ) {
+ min_dist = d2;
+ nav = stations[i];
+ }
}
- return false;
+ return nav;
}
projects / flightgear.git / blobdiff