1 // environment.hxx -- routines to model the natural environment.
3 // Written by David Megginson, started February 2002.
5 // Copyright (C) 2002 David Megginson - david@megginson.com
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.
24 #ifndef _ENVIRONMENT_HXX
25 #define _ENVIRONMENT_HXX
27 #include <simgear/compiler.h>
29 #include <Main/fgfs.hxx>
31 #ifdef SG_HAVE_STD_INCLUDES
41 * Model the natural environment.
43 * This class models the natural environment at a specific place and
44 * time. A separate instance is necessary for each location or time.
46 * This class should eventually move to SimGear.
54 FGEnvironment (const FGEnvironment &environment);
55 virtual ~FGEnvironment();
57 virtual double get_visibility_m () const;
59 virtual double get_temperature_sea_level_degc () const;
60 virtual double get_temperature_degc () const;
61 virtual double get_pressure_sea_level_inhg () const;
62 virtual double get_pressure_inhg () const;
63 virtual double get_density_sea_level_slugft3 () const;
64 virtual double get_density_slugft3 () const;
66 virtual double get_wind_from_heading_deg () const;
67 virtual double get_wind_speed_kt () const;
68 virtual double get_wind_from_north_fps () const;
69 virtual double get_wind_from_east_fps () const;
70 virtual double get_wind_from_down_fps () const;
72 virtual void set_visibility_m (double v);
74 virtual void set_temperature_sea_level_degc (double t);
75 virtual void set_temperature_degc (double t);
76 virtual void set_pressure_sea_level_inhg (double p);
77 virtual void set_pressure_inhg (double p);
78 virtual void set_density_sea_level_slugft3 (double d);
79 virtual void set_density_slugft3 (double d);
81 virtual void set_wind_from_heading_deg (double h);
82 virtual void set_wind_speed_kt (double s);
83 virtual void set_wind_from_north_fps (double n);
84 virtual void set_wind_from_east_fps (double e);
85 virtual void set_wind_from_down_fps (double d);
89 friend class FGEnvironmentMgr;
91 virtual double get_elevation_ft () const;
92 virtual void set_elevation_ft (double elevation_ft);
96 void _setup_tables ();
98 void _recalc_hdgspd ();
101 void _recalc_sl_temperature ();
102 void _recalc_alt_temperature ();
103 void _recalc_sl_pressure ();
104 void _recalc_alt_pressure ();
105 void _recalc_sl_density ();
106 void _recalc_alt_density ();
108 SGInterpTable * _temperature_degc_table;
109 SGInterpTable * _pressure_inhg_table;
110 SGInterpTable * _density_slugft3_table;
117 double temperature_sea_level_degc;
118 double temperature_degc;
119 double pressure_sea_level_inhg;
120 double pressure_inhg;
121 double density_sea_level_slugft3;
122 double density_slugft3;
124 double wind_from_heading_deg;
125 double wind_speed_kt;
127 double wind_from_north_fps;
128 double wind_from_east_fps;
129 double wind_from_down_fps;
133 #endif // _ENVIRONMENT_HXX