+++ /dev/null
-// weather.cxx -- routines to model weather
-//
-// Written by Curtis Olson, started July 1997.
-//
-// Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License as
-// published by the Free Software Foundation; either version 2 of the
-// License, or (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful, but
-// WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-// General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-//
-// $Id$
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#ifdef HAVE_WINDOWS_H
-# include <windows.h>
-#endif
-
-#include <GL/glut.h>
-#include <GL/gl.h>
-
-#include <math.h>
-
-#include <simgear/debug/logstream.hxx>
-#include <simgear/math/sg_random.h>
-
-#include <Main/fg_props.hxx>
-#include <Aircraft/aircraft.hxx>
-#include <Environment/environment.hxx>
-
-
-// This is a record containing current weather info
-FGWeather current_weather;
-
-
-FGWeather::FGWeather()
- : visibility_m(32000),
- wind_from_heading_deg(0),
- wind_speed_kt(0),
- wind_from_north_fps(0),
- wind_from_east_fps(0),
- wind_from_down_fps(0),
- fog_exp_density(0),
- fog_exp2_density(0)
-{
-}
-
-
-FGWeather::~FGWeather()
-{
-}
-
-
-// Initialize the weather modeling subsystem
-void FGWeather::init ()
-{
- SG_LOG( SG_GENERAL, SG_INFO, "Initializing weather subsystem");
-}
-
-
-void
-FGWeather::bind ()
-{
- fgTie("/environment/visibility-m", this,
- &FGWeather::get_visibility_m, &FGWeather::set_visibility_m);
- fgTie("/environment/wind-from-heading-deg", this,
- &FGWeather::get_wind_from_heading_deg,
- &FGWeather::set_wind_from_heading_deg);
- fgTie("/environment/wind-speed-kt", this,
- &FGWeather::get_wind_speed_kt, &FGWeather::set_wind_speed_kt);
- fgTie("/environment/wind-from-north-fps", this,
- &FGWeather::get_wind_from_north_fps,
- &FGWeather::set_wind_from_north_fps);
- fgTie("/environment/wind-from-east-fps", this,
- &FGWeather::get_wind_from_east_fps,
- &FGWeather::set_wind_from_east_fps);
- fgTie("/environment/wind-from-down-fps", this,
- &FGWeather::get_wind_from_down_fps,
- &FGWeather::set_wind_from_down_fps);
-}
-
-void
-FGWeather::unbind ()
-{
- fgUntie("/environment/visibility-m");
- fgUntie("/environment/wind-from-heading-deg");
- fgUntie("/environment/wind-speed-kt");
- fgUntie("/environment/wind-from-north-fps");
- fgUntie("/environment/wind-from-east-fps");
- fgUntie("/environment/wind-from-down-fps");
-}
-
-void FGWeather::update (int dt)
-{
- // FIXME: the FDMs should update themselves
- current_aircraft.fdm_state
- ->set_Velocities_Local_Airmass(wind_from_north_fps,
- wind_from_east_fps,
- wind_from_down_fps);
-}
-
-void
-FGWeather::set_visibility_m (double v)
-{
- glMatrixMode(GL_MODELVIEW);
- // in meters
- visibility_m = v;
-
- // for GL_FOG_EXP
- fog_exp_density = -log(0.01 / visibility_m);
-
- // for GL_FOG_EXP2
- fog_exp2_density = sqrt( -log(0.01) ) / visibility_m;
-
- // Set correct opengl fog density
- glFogf (GL_FOG_DENSITY, fog_exp2_density);
- glFogi( GL_FOG_MODE, GL_EXP2 );
-
- // SG_LOG( SG_INPUT, SG_DEBUG, "Fog density = " << fog_density );
- // SG_LOG( SG_INPUT, SG_INFO,
- // "Fog exp2 density = " << fog_exp2_density );
-}
-
-void
-FGWeather::set_wind_from_heading_deg (double h)
-{
- wind_from_heading_deg = h;
- _recalc_ne();
-}
-
-void
-FGWeather::set_wind_speed_kt (double s)
-{
- wind_speed_kt = s;
- _recalc_ne();
-}
-
-void
-FGWeather::set_wind_from_north_fps (double n)
-{
- wind_from_north_fps = n;
- _recalc_hdgspd();
-}
-
-void
-FGWeather::set_wind_from_east_fps (double e)
-{
- wind_from_east_fps = e;
- _recalc_hdgspd();
-}
-
-void
-FGWeather::set_wind_from_down_fps (double d)
-{
- wind_from_down_fps = d;
- _recalc_hdgspd();
-}
-
-void
-FGWeather::_recalc_hdgspd ()
-{
- wind_from_heading_deg = acos(wind_from_north_fps / wind_speed_kt);
- wind_speed_kt = asin(wind_from_north_fps / wind_speed_kt);
-}
-
-void
-FGWeather::_recalc_ne ()
-{
- wind_from_north_fps = wind_speed_kt * cos(wind_from_heading_deg);
- wind_from_east_fps = wind_speed_kt * sin(wind_from_heading_deg);
-}
-
-// end of weather.cxx
-
+++ /dev/null
-// weather.hxx -- routines to model weather
-//
-// Written by Curtis Olson, started July 1997.
-//
-// Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License as
-// published by the Free Software Foundation; either version 2 of the
-// License, or (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful, but
-// WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-// General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-//
-// $Id$
-
-
-#ifndef _WEATHER_HXX
-#define _WEATHER_HXX
-
-
-#include <simgear/compiler.h>
-
-#include <GL/gl.h>
-
-#include <Main/fgfs.hxx>
-
-#ifdef SG_HAVE_STD_INCLUDES
-# include <cmath>
-#else
-# include <math.h>
-#endif
-
-// holds the current weather values
-class FGWeather : public FGSubsystem
-{
-
-public:
-
- FGWeather();
- virtual ~FGWeather();
-
- virtual void init ();
- virtual void bind ();
- virtual void unbind ();
- virtual void update (int dt);
-
- inline virtual double get_visibility_m () const { return visibility_m; }
- inline virtual double get_wind_from_heading_deg () const {
- return wind_from_heading_deg;
- }
- inline virtual double get_wind_speed_kt () const { return wind_speed_kt; }
- inline virtual double get_wind_from_north_fps () const {
- return wind_from_north_fps;
- }
- inline virtual double get_wind_from_east_fps () const {
- return wind_from_east_fps;
- }
- inline virtual double get_wind_from_down_fps () const {
- return wind_from_down_fps;
- }
-
- virtual void set_visibility_m (double v);
- virtual void set_wind_from_heading_deg (double h);
- virtual void set_wind_speed_kt (double s);
- virtual void set_wind_from_north_fps (double n);
- virtual void set_wind_from_east_fps (double e);
- virtual void set_wind_from_down_fps (double d);
-
-private:
-
- void _recalc_hdgspd ();
- void _recalc_ne ();
-
- double visibility_m;
-
- double wind_from_heading_deg;
- double wind_speed_kt;
-
- double wind_from_north_fps;
- double wind_from_east_fps;
- double wind_from_down_fps;
-
- // Do these belong here?
- GLfloat fog_exp_density;
- GLfloat fog_exp2_density;
-
-};
-
-extern FGWeather current_weather;
-
-#endif // _WEATHER_HXX
projects / flightgear.git / commitdiff