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.
33 #include <simgear/xgl/xgl.h>
37 #include <simgear/debug/logstream.hxx>
38 #include <simgear/math/sg_random.h>
40 #include <Aircraft/aircraft.hxx>
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 SG_LOG( SG_GENERAL, SG_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 );