1 // weather.cxx -- routines to model weather
3 // Written by Curtis Olson, started July 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
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.
22 // (Log is kept at end of this file)
38 #include <Aircraft/aircraft.hxx>
39 #include <Debug/logstream.hxx>
40 #include <Math/fg_random.h>
41 #include <Weather/weather.hxx>
44 // This is a record containing current weather info
45 FGWeather current_weather;
48 FGWeather::FGWeather() {
52 FGWeather::~FGWeather() {
56 // Initialize the weather modeling subsystem
57 void FGWeather::Init( ) {
58 FG_LOG( FG_GENERAL, FG_INFO, "Initializing weather subsystem");
60 // Configure some wind
61 // FG_V_north_airmass = 15; // ft/s =~ 10mph
63 // set_visibility( 45000.0 ); // in meters
64 set_visibility( 32000.0 ); // about 20 miles (in meters)
68 // Update the weather parameters for the current position
69 void FGWeather::Update( void ) {
72 f = current_aircraft.fdm_state;
74 // Add some random turbulence
75 // f->set_U_gust( fg_random() * 5.0 - 2.5 );
76 // f->set_V_gust( fg_random() * 5.0 - 2.5 );
77 // f->set_W_gust( fg_random() * 5.0 - 2.5 );
82 // Revision 1.5 1998/12/06 13:51:26 curt
83 // Turned "struct fgWEATHER" into "class FGWeather".
85 // Revision 1.4 1998/12/05 15:54:31 curt
86 // Renamed class fgFLIGHT to class FGState as per request by JSB.
88 // Revision 1.3 1998/11/23 21:49:11 curt
89 // Borland portability tweaks.
91 // Revision 1.2 1998/11/06 21:18:29 curt
92 // Converted to new logstream debugging facility. This allows release
93 // builds with no messages at all (and no performance impact) by using
94 // the -DFG_NDEBUG flag.
96 // Revision 1.1 1998/10/17 01:34:36 curt
99 // Revision 1.18 1998/10/02 12:46:50 curt
100 // Added an "auto throttle"
102 // Revision 1.17 1998/07/20 12:51:57 curt
103 // Default visibility to about 20 miles.
105 // Revision 1.16 1998/06/12 01:00:59 curt
106 // Build only static libraries.
107 // Declare memmove/memset for Sloaris.
108 // Added support for exponetial fog, which solves for the proper density to
109 // achieve the desired visibility range.
111 // Revision 1.15 1998/04/25 22:06:34 curt
112 // Edited cvs log messages in source files ... bad bad bad!
114 // Revision 1.14 1998/02/09 15:07:54 curt
117 // Revision 1.13 1998/01/27 00:48:08 curt
118 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
119 // system and commandline/config file processing code.
121 // Revision 1.12 1998/01/19 19:27:22 curt
122 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
123 // This should simplify things tremendously.
125 // Revision 1.11 1998/01/19 18:40:41 curt
126 // Tons of little changes to clean up the code and to remove fatal errors
127 // when building with the c++ compiler.
129 // Revision 1.10 1997/12/30 22:22:46 curt
130 // Further integration of event manager.
132 // Revision 1.9 1997/12/30 20:48:03 curt
133 // Integrated new event manager with subsystem initializations.
135 // Revision 1.8 1997/12/11 04:43:58 curt
136 // Fixed sun vector and lighting problems. I thing the moon is now lit
139 // Revision 1.7 1997/12/10 22:37:56 curt
140 // Prepended "fg" on the name of all global structures that didn't have it yet.
141 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
143 // Revision 1.6 1997/08/27 03:30:38 curt
144 // Changed naming scheme of basic shared structures.
146 // Revision 1.5 1997/08/22 21:34:42 curt
147 // Doing a bit of reorganizing and house cleaning.
149 // Revision 1.4 1997/08/02 16:23:55 curt
152 // Revision 1.3 1997/07/31 22:52:41 curt
153 // Working on redoing internal coordinate systems & scenery transformations.
155 // Revision 1.2 1997/07/30 16:12:44 curt
156 // Moved fg_random routines from Util/ to Math/
158 // Revision 1.1 1997/07/19 23:03:57 curt