1 // nav.hxx -- vor/dme/ndb class
3 // Written by Curtis Olson, started April 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <simgear/compiler.h>
30 #include <simgear/math/sg_geodesy.hxx>
31 #include <simgear/misc/fgstream.hxx>
32 #include <simgear/magvar/magvar.hxx>
33 #include <simgear/timing/sg_time.hxx>
35 #ifdef FG_HAVE_STD_INCLUDES
37 #elif defined( FG_HAVE_NATIVE_SGI_COMPILERS )
38 # include <iostream.h>
39 #elif defined( __BORLANDC__ )
45 #if ! defined( FG_HAVE_NATIVE_SGI_COMPILERS )
46 FG_USING_STD(istream);
59 string ident; // to avoid a core dump with corrupt data
60 double magvar; // magvar from true north (negative = W)
65 inline ~FGNav(void) {}
67 inline char get_type() const { return type; }
68 inline double get_lon() const { return lon; }
69 inline double get_lat() const { return lat; }
70 inline double get_elev() const { return elev; }
71 inline double get_x() const { return x; }
72 inline double get_y() const { return y; }
73 inline double get_z() const { return z; }
74 inline int get_freq() const { return freq; }
75 inline int get_range() const { return range; }
76 inline bool get_has_dme() const { return has_dme; }
77 inline const char *get_ident() { return ident.c_str(); }
78 inline double get_magvar () const { return magvar; }
80 /* inline void set_type( char t ) { type = t; }
81 inline void set_lon( double l ) { lon = l; }
82 inline void set_lat( double l ) { lat = l; }
83 inline void set_elev( double e ) { elev = e; }
84 inline void set_freq( int f ) { freq = f; }
85 inline void set_range( int r ) { range = r; }
86 inline void set_dme( bool b ) { dme = b; }
87 inline void set_ident( char *i ) { strncpy( ident, i, 5 ); } */
89 friend istream& operator>> ( istream&, FGNav& );
94 operator >> ( istream& in, FGNav& n )
97 char c /* , magvar_dir */ ;
100 static SGTime time_params;
101 static bool first_time = true;
102 static double julian_date = 0;
104 time_params.update( 0.0, 0.0, 0 );
105 julian_date = time_params.getJD();
109 in >> n.type >> n.lat >> n.lon >> n.elev >> f >> n.range
110 >> c >> n.ident >> magvar_s;
112 n.freq = (int)(f*100.0 + 0.5);
119 // Calculate the magvar from true north.
120 // cout << "Calculating magvar for navaid " << n.ident << endl;
121 if (magvar_s == "XXX") {
122 // default to mag var as of 1990-01-01 (Julian 2447892.5)
123 // cout << "lat = " << n.lat << " lon = " << n.lon << " elev = "
124 // << n.elev << " JD = "
125 // << julian_date << endl;
126 n.magvar = sgGetMagVar(n.lon * DEG_TO_RAD, n.lat * DEG_TO_RAD,
127 n.elev * FEET_TO_METER,
128 julian_date) * RAD_TO_DEG;
129 // cout << "Default variation at " << n.lon << ',' << n.lat
130 // << " is " << var << endl;
132 // I don't know what this is for - CLO 1 Feb 2001
133 if (var - int(var) >= 0.5)
134 n.magvar = int(var) + 1;
135 else if (var - int(var) <= -0.5)
136 n.magvar = int(var) - 1;
140 // cout << "Defaulted to magvar of " << n.magvar << endl;
144 sscanf(magvar_s.c_str(), "%d%c", &var, &direction);
146 if (direction == 'W')
147 n.magvar = -n.magvar;
148 // cout << "Explicit magvar of " << n.magvar << endl;
150 // cout << n.ident << " " << n.magvar << endl;
152 // generate cartesian coordinates
153 Point3D geod( n.lon * DEG_TO_RAD, n.lat * DEG_TO_RAD, n.elev );
154 Point3D cart = sgGeodToCart( geod );
159 return in >> skipeol;
163 #endif // _FG_NAV_HXX