/**************************************************************************
 * weather.h -- routines to model weather
 *
 * Written by Curtis Olson, started July 1997.
 *
 * Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
 *
 * 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.
 *
 * $Id$
 * (Log is kept at end of this file)
 **************************************************************************/


#ifndef _WEATHER_H
#define _WEATHER_H


#ifdef __cplusplus                                                          
extern "C" {                            
#endif                                   


/* holds the current weather values */
struct fgWEATHER {
    float visibility;
    float fog_density;
};

extern struct fgWEATHER current_weather;


/* Initialize the weather modeling subsystem */
void fgWeatherInit( void );


/* Update the weather parameters for the current position */
void fgWeatherUpdate( void );


/* Get the current visibility */
float fgWeatherGetVisibility( void );


/* Set the visibility and update fog parameters */
void fgWeatherSetVisibility( float visibility );


#ifdef __cplusplus
}
#endif


#endif /* _WEATHER_H */


/* $Log$
/* Revision 1.10  1998/06/12 01:01:00  curt
/* Build only static libraries.
/* Declare memmove/memset for Sloaris.
/* Added support for exponetial fog, which solves for the proper density to
/* achieve the desired visibility range.
/*
 * Revision 1.9  1998/04/21 17:02:46  curt
 * Prepairing for C++ integration.
 *
 * Revision 1.8  1998/01/22 02:59:44  curt
 * Changed #ifdef FILE_H to #ifdef _FILE_H
 *
 * Revision 1.7  1998/01/19 18:40:41  curt
 * Tons of little changes to clean up the code and to remove fatal errors
 * when building with the c++ compiler.
 *
 * Revision 1.6  1997/12/30 22:22:47  curt
 * Further integration of event manager.
 *
 * Revision 1.5  1997/12/10 22:37:56  curt
 * Prepended "fg" on the name of all global structures that didn't have it yet.
 * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
 *
 * Revision 1.4  1997/08/27 03:30:39  curt
 * Changed naming scheme of basic shared structures.
 *
 * Revision 1.3  1997/08/22 21:34:43  curt
 * Doing a bit of reorganizing and house cleaning.
 *
 * Revision 1.2  1997/07/23 21:52:30  curt
 * Put comments around the text after an #endif for increased portability.
 *
 * Revision 1.1  1997/07/19 23:03:58  curt
 * Initial revision.
 *
 */