135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
// fg_time.hxx -- data structures and routines for managing time related stuff.
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//
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// Written by Curtis Olson, started August 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifndef _FG_TIME_HXX
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#define _FG_TIME_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include "Include/compiler.h"
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#ifdef FG_HAVE_STD_INCLUDES
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# include <ctime>
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#else
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# include <time.h>
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#endif
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#include <FDM/flight.hxx>
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// Define a structure containing global time parameters
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class FGTime {
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private:
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// Unix "calendar" time in seconds
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time_t cur_time;
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// Break down of GMT time
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struct tm *gmt;
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// Julian date
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double jd;
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// modified Julian date
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double mjd;
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double last_mjd, last_dy;
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int last_mn, last_yr;
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// side real time at prime meridian
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double gst;
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// local side real time
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double lst;
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// the difference between the precise sidereal time algorithm
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// result and the course result. course + diff has good accuracy
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// for the short term
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double gst_diff;
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// An offset in seconds from the true time. Allows us to adjust
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// the effective time of day.
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long int warp;
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// How much to change the value of warp each iteration. Allows us
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// to make time progress faster than normal.
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long int warp_delta;
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// Paused?
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bool pause;
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void local_update_sky_and_lighting_params( void );
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public:
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FGTime();
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~FGTime();
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inline double getMjd() const { return mjd; };
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inline double getLst() const { return lst; };
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inline double getGst() const { return gst; };
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inline time_t get_cur_time() const { return cur_time; };
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inline struct tm* getGmt()const { return gmt; };
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inline bool getPause() const { return pause; };
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void adjust_warp(int val) { warp += val; };
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void adjust_warp_delta(int val) { warp_delta += val; };
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void togglePauseMode() { pause = !pause; };
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// Initialize the time dependent variables
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void init();
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// Update the time dependent variables
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void update(FGInterface *f);
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void cal_mjd (int mn, double dy, int yr);
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void utc_gst();
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double sidereal_precise (double lng);
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double sidereal_course(double lng);
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static FGTime *cur_time_params;
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// Some other stuff which were changed to FGTime members on
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// questionable grounds -:)
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// time_t get_start_gmt(int year);
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time_t get_gmt(int year, int month, int day,
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int hour, int minute, int second);
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char* format_time( const struct tm* p, char* buf );
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long int fix_up_timezone( long int timezone_orig );
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};
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#endif // _FG_TIME_HXX
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