/**************************************************************************
- * void CelestialBody::updatePosition(fgTIME *t, Star *ourSun)
+ * void CelestialBody::updatePosition(SGTime *t, Star *ourSun)
*
* Basically, this member function provides a general interface for
* calculating the right ascension and declinaion. This function is
* position is calculated an a slightly different manner.
*
* arguments:
- * fgTIME t: provides the current time.
+ * SGTime t: provides the current time.
* Star *ourSun: the sun's position is needed to convert heliocentric
* coordinates into geocentric coordinates.
*
* return value: none
*
*************************************************************************/
-void CelestialBody::updatePosition(FGTime *t, Star *ourSun)
+void CelestialBody::updatePosition(SGTime *t, Star *ourSun)
{
double eccAnom, v, ecl, actTime,
xv, yv, xh, yh, zh, xg, yg, zg, xe, ye, ze;
#include <simgear/constants.h>
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
class Star;
double lonEcl, latEcl;
double fgCalcEccAnom(double M, double e);
- double fgCalcActTime(FGTime *t);
- void updateOrbElements(FGTime *t);
+ double fgCalcActTime(SGTime *t);
+ void updateOrbElements(SGTime *t);
public:
CelestialBody(double Nf, double Ns,
double wf, double ws,
double af, double as,
double ef, double es,
- double Mf, double Ms, FGTime *t);
+ double Mf, double Ms, SGTime *t);
CelestialBody(double Nf, double Ns,
double If, double Is,
double wf, double ws,
double getMagnitude();
double getLon();
double getLat();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
/*****************************************************************************
double wf, double ws,
double af, double as,
double ef, double es,
- double Mf, double Ms, FGTime *t)
+ double Mf, double Ms, SGTime *t)
{
NFirst = Nf; NSec = Ns;
iFirst = If; iSec = Is;
};
/****************************************************************************
- * inline void CelestialBody::updateOrbElements(FGTime *t)
+ * inline void CelestialBody::updateOrbElements(SGTime *t)
* given the current time, this private member calculates the actual
* orbital elements
*
- * Arguments: FGTime *t: the current time:
+ * Arguments: SGTime *t: the current time:
*
* return value: none
***************************************************************************/
-inline void CelestialBody::updateOrbElements(FGTime *t)
+inline void CelestialBody::updateOrbElements(SGTime *t)
{
double actTime = fgCalcActTime(t);
M = DEG_TO_RAD * (MFirst + (MSec * actTime));
a = aFirst + (aSec * actTime);
}
/*****************************************************************************
- * inline double CelestialBody::fgCalcActTime(FGTime *t)
+ * inline double CelestialBody::fgCalcActTime(SGTime *t)
* this private member function returns the offset in days from the epoch for
* wich the orbital elements are calculated (Jan, 1st, 2000).
*
*
* return value: the (fractional) number of days until Jan 1, 2000.
****************************************************************************/
-inline double CelestialBody::fgCalcActTime(FGTime *t)
+inline double CelestialBody::fgCalcActTime(SGTime *t)
{
return (t->getMjd() - 36523.5);
}
// Update (recalculate) the positions of all objects for the specified
// time
-void FGEphemeris::update( FGTime *t, double lat ) {
+void FGEphemeris::update( SGTime *t, double lat ) {
// update object positions
our_sun->updatePosition( t );
moon->updatePosition( t, lat, our_sun );
#include <plib/sg.h>
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "star.hxx"
#include "moon.hxx"
// Update (recalculate) the positions of all objects for the
// specified time
- void update(FGTime *t, double lat);
+ void update(SGTime *t, double lat);
// sun
inline Star *get_sun() const { return our_sun; }
#include "jupiter.hxx"
/*************************************************************************
- * Jupiter::Jupiter(FGTime *t)
+ * Jupiter::Jupiter(SGTime *t)
* Public constructor for class Jupiter
* Argument: The current time.
* the hard coded orbital elements for Jupiter are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Jupiter::Jupiter(FGTime *t) :
+Jupiter::Jupiter(SGTime *t) :
CelestialBody(100.4542, 2.7685400E-5,
1.3030, -1.557E-7,
273.8777, 1.6450500E-5,
}
/*************************************************************************
- * void Jupiter::updatePosition(FGTime *t, Star *ourSun)
+ * void Jupiter::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Jupiter, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Jupiter specific equation
*************************************************************************/
-void Jupiter::updatePosition(FGTime *t, Star *ourSun)
+void Jupiter::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -9.25 + 5*log10( r*R ) + 0.014 * FV;
#ifndef _JUPITER_HXX_
#define _JUPITER_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Jupiter : public CelestialBody
{
public:
- Jupiter (FGTime *t);
+ Jupiter (SGTime *t);
Jupiter ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _JUPITER_HXX_
#include "mars.hxx"
/*************************************************************************
- * Mars::Mars(FGTime *t)
+ * Mars::Mars(SGTime *t)
* Public constructor for class Mars
* Argument: The current time.
* the hard coded orbital elements for Mars are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Mars::Mars(FGTime *t) :
+Mars::Mars(SGTime *t) :
CelestialBody(49.55740, 2.1108100E-5,
1.8497, -1.78E-8,
286.5016, 2.9296100E-5,
{
}
/*************************************************************************
- * void Mars::updatePosition(FGTime *t, Star *ourSun)
+ * void Mars::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Mars, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Mars specific equation
*************************************************************************/
-void Mars::updatePosition(FGTime *t, Star *ourSun)
+void Mars::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -1.51 + 5*log10( r*R ) + 0.016 * FV;
#ifndef _MARS_HXX_
#define _MARS_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Mars : public CelestialBody
{
public:
- Mars ( FGTime *t);
+ Mars ( SGTime *t);
Mars ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _MARS_HXX_
#include "mercury.hxx"
/*************************************************************************
- * Mercury::Mercury(FGTime *t)
+ * Mercury::Mercury(SGTime *t)
* Public constructor for class Mercury
* Argument: The current time.
* the hard coded orbital elements for Mercury are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Mercury::Mercury(FGTime *t) :
+Mercury::Mercury(SGTime *t) :
CelestialBody (48.33130, 3.2458700E-5,
7.0047, 5.00E-8,
29.12410, 1.0144400E-5,
{
}
/*************************************************************************
- * void Mercury::updatePosition(FGTime *t, Star *ourSun)
+ * void Mercury::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Mercury, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Mercury specific equation
*************************************************************************/
-void Mercury::updatePosition(FGTime *t, Star *ourSun)
+void Mercury::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -0.36 + 5*log10( r*R ) + 0.027 * FV + 2.2E-13 * pow(FV, 6);
#ifndef _MERCURY_HXX_
#define _MERCURY_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Mercury : public CelestialBody
{
public:
- Mercury ( FGTime *t);
+ Mercury ( SGTime *t);
Mercury ();
- void updatePosition(FGTime *t, Star* ourSun);
+ void updatePosition(SGTime *t, Star* ourSun);
};
#endif // _MERURY_HXX_
/*************************************************************************
- * Moon::Moon(FGTime *t)
+ * Moon::Moon(SGTime *t)
* Public constructor for class Moon. Initializes the orbital elements and
* sets up the moon texture.
* Argument: The current time.
* the hard coded orbital elements for Moon are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Moon::Moon(FGTime *t) :
+Moon::Moon(SGTime *t) :
CelestialBody(125.1228, -0.0529538083,
5.1454, 0.00000,
318.0634, 0.1643573223,
/*****************************************************************************
- * void Moon::updatePosition(FGTime *t, Star *ourSun)
+ * void Moon::updatePosition(SGTime *t, Star *ourSun)
* this member function calculates the actual topocentric position (i.e.)
* the position of the moon as seen from the current position on the surface
* of the moon.
****************************************************************************/
-void Moon::updatePosition(FGTime *t, double lat, Star *ourSun)
+void Moon::updatePosition(SGTime *t, double lat, Star *ourSun)
{
double
eccAnom, ecl, actTime,
#include <simgear/constants.h>
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
public:
- Moon( FGTime *t);
+ Moon( SGTime *t);
Moon();
~Moon();
- void updatePosition(FGTime *t, double lat, Star *ourSun);
+ void updatePosition(SGTime *t, double lat, Star *ourSun);
// void newImage();
};
#include "neptune.hxx"
/*************************************************************************
- * Neptune::Neptune(FGTime *t)
+ * Neptune::Neptune(SGTime *t)
* Public constructor for class Neptune
* Argument: The current time.
* the hard coded orbital elements for Neptune are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Neptune::Neptune(FGTime *t) :
+Neptune::Neptune(SGTime *t) :
CelestialBody(131.7806, 3.0173000E-5,
1.7700, -2.550E-7,
272.8461, -6.027000E-6,
{
}
/*************************************************************************
- * void Neptune::updatePosition(FGTime *t, Star *ourSun)
+ * void Neptune::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Neptune, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Neptune specific equation
*************************************************************************/
-void Neptune::updatePosition(FGTime *t, Star *ourSun)
+void Neptune::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -6.90 + 5*log10 (r*R) + 0.001 *FV;
#ifndef _NEPTUNE_HXX_
#define _NEPTUNE_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Neptune : public CelestialBody
{
public:
- Neptune ( FGTime *t);
+ Neptune ( SGTime *t);
Neptune ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _NEPTUNE_HXX_
#include "saturn.hxx"
/*************************************************************************
- * Saturn::Saturn(FGTime *t)
+ * Saturn::Saturn(SGTime *t)
* Public constructor for class Saturn
* Argument: The current time.
* the hard coded orbital elements for Saturn are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Saturn::Saturn(FGTime *t) :
+Saturn::Saturn(SGTime *t) :
CelestialBody(113.6634, 2.3898000E-5,
2.4886, -1.081E-7,
339.3939, 2.9766100E-5,
}
/*************************************************************************
- * void Saturn::updatePosition(FGTime *t, Star *ourSun)
+ * void Saturn::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Saturn, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Saturn specific equation
*************************************************************************/
-void Saturn::updatePosition(FGTime *t, Star *ourSun)
+void Saturn::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
#ifndef _SATURN_HXX_
#define _SATURN_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Saturn : public CelestialBody
{
public:
- Saturn ( FGTime *t);
+ Saturn ( SGTime *t);
Saturn ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _SATURN_HXX_
/*************************************************************************
- * Star::Star(FGTime *t)
+ * Star::Star(SGTime *t)
* Public constructor for class Star
* Argument: The current time.
* the hard coded orbital elements our sun are passed to
* note that the word sun is avoided, in order to prevent some compilation
* problems on sun systems
************************************************************************/
-Star::Star(FGTime *t) :
+Star::Star(SGTime *t) :
CelestialBody (0.000000, 0.0000000000,
0.0000, 0.00000,
282.9404, 4.7093500E-5,
/*************************************************************************
- * void Star::updatePosition(FGTime *t, Star *ourSun)
+ * void Star::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of our sun.
*************************************************************************/
-void Star::updatePosition(FGTime *t)
+void Star::updatePosition(SGTime *t)
{
double
actTime, eccAnom,
#define _STAR_HXX_
-// #include <Time/fg_time.hxx>
#include "celestialBody.hxx"
public:
- Star (FGTime *t);
+ Star (SGTime *t);
Star ();
~Star();
- void updatePosition(FGTime *t);
+ void updatePosition(SGTime *t);
double getM();
double getw();
double getxs();
#include "uranus.hxx"
/*************************************************************************
- * Uranus::Uranus(FGTime *t)
+ * Uranus::Uranus(SGTime *t)
* Public constructor for class Uranus
* Argument: The current time.
* the hard coded orbital elements for Uranus are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Uranus::Uranus(FGTime *t) :
+Uranus::Uranus(SGTime *t) :
CelestialBody(74.00050, 1.3978000E-5,
0.7733, 1.900E-8,
96.66120, 3.0565000E-5,
}
/*************************************************************************
- * void Uranus::updatePosition(FGTime *t, Star *ourSun)
+ * void Uranus::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Uranus, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Uranus specific equation
*************************************************************************/
-void Uranus::updatePosition(FGTime *t, Star *ourSun)
+void Uranus::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -7.15 + 5*log10( r*R) + 0.001 * FV;
#ifndef _URANUS_HXX_
#define _URANUS_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Uranus : public CelestialBody
{
public:
- Uranus ( FGTime *t);
+ Uranus ( SGTime *t);
Uranus ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _URANUS_HXX_
#include "venus.hxx"
/*************************************************************************
- * Venus::Venus(FGTime *t)
+ * Venus::Venus(SGTime *t)
* Public constructor for class Venus
* Argument: The current time.
* the hard coded orbital elements for Venus are passed to
* CelestialBody::CelestialBody();
************************************************************************/
-Venus::Venus(FGTime *t) :
+Venus::Venus(SGTime *t) :
CelestialBody(76.67990, 2.4659000E-5,
3.3946, 2.75E-8,
54.89100, 1.3837400E-5,
}
/*************************************************************************
- * void Venus::updatePosition(FGTime *t, Star *ourSun)
+ * void Venus::updatePosition(SGTime *t, Star *ourSun)
*
* calculates the current position of Venus, by calling the base class,
* CelestialBody::updatePosition(); The current magnitude is calculated using
* a Venus specific equation
*************************************************************************/
-void Venus::updatePosition(FGTime *t, Star *ourSun)
+void Venus::updatePosition(SGTime *t, Star *ourSun)
{
CelestialBody::updatePosition(t, ourSun);
magnitude = -4.34 + 5*log10( r*R ) + 0.013 * FV + 4.2E-07 * pow(FV,3);
#ifndef _VENUS_HXX_
#define _VENUS_HXX_
-#include <simgear/timing/fg_time.hxx>
+#include <simgear/timing/sg_time.hxx>
#include "celestialBody.hxx"
#include "star.hxx"
class Venus : public CelestialBody
{
public:
- Venus ( FGTime *t);
+ Venus ( SGTime *t);
Venus ();
- void updatePosition(FGTime *t, Star *ourSun);
+ void updatePosition(SGTime *t, Star *ourSun);
};
#endif // _VENUS_HXX_
lib_LIBRARIES = libsgtiming.a
include_HEADERS = \
- fg_time.hxx \
geocoord.h \
+ sg_time.hxx \
timezone.h
libsgtiming_a_SOURCES = \
- fg_time.cxx \
geocoord.cxx \
lowleveltime.cxx lowleveltime.h \
+ sg_time.cxx \
timezone.cxx \
# event.cxx event.hxx \
# fg_timer.cxx fg_timer.hxx \
+++ /dev/null
-// fg_time.cxx -- data structures and routines for managing time related stuff.
-//
-// Written by Curtis Olson, started August 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.
-//
-// $Id$
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <simgear/compiler.h>
-
-#ifdef FG_HAVE_STD_INCLUDES
-# include <cmath>
-# include <cstdio>
-# include <cstdlib>
-# include <ctime>
-#else
-# include <math.h>
-# include <stdio.h>
-# include <stdlib.h>
-# include <time.h>
-#endif
-
-#ifdef HAVE_SYS_TIMEB_H
-# include <sys/timeb.h> // for ftime() and struct timeb
-#endif
-#ifdef HAVE_UNISTD_H
-# include <unistd.h> // for gettimeofday()
-#endif
-#ifdef HAVE_SYS_TIME_H
-# include <sys/time.h> // for get/setitimer, gettimeofday, struct timeval
-#endif
-
-#include <simgear/constants.h>
-#include <simgear/debug/logstream.hxx>
-// #include <simgear/magvar/magvar.hxx>
-#include <simgear/misc/fgpath.hxx>
-
-// #include <FDM/flight.hxx>
-// #include <Main/options.hxx>
-// #include <Time/light.hxx>
-
-#include "fg_time.hxx"
-#include "timezone.h"
-#include "lowleveltime.h"
-// #include "moonpos.hxx"
-// #include "sunpos.hxx"
-
-
-#define DEGHR(x) ((x)/15.)
-#define RADHR(x) DEGHR(x*RAD_TO_DEG)
-
-
-// #define MK_TIME_IS_GMT 0 // default value
-// #define TIME_ZONE_OFFSET_WORK 0 // default value
-
-
-FGTime::FGTime( const string& root )
-{
- if (cur_time_params) {
- FG_LOG( FG_GENERAL, FG_ALERT,
- "Error: only one instance of FGTime allowed" );
- exit(-1);
- }
-
- cur_time_params = this;
-
- FGPath zone( root );
- zone.append( "Timezone" );
- zone.append( "zone.tab" );
-
- FG_LOG( FG_EVENT, FG_INFO, "Reading timezone info from: " << zone.str() );
- tzContainer = new TimezoneContainer( zone.c_str() );
- warp=0;
- warp_delta=0;
-}
-
-
-FGTime::~FGTime()
-{
- delete tzContainer;
- delete zonename;
-}
-
-void FGTime::updateLocal( double lon, double lat, const string& root )
-{
- time_t currGMT;
- time_t aircraftLocalTime;
- GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
- GeoCoord* nearestTz = tzContainer->getNearest(location);
- FGPath zone( root );
- zone.append ("Timezone" );
- zone.append ( nearestTz->getDescription() );
- if ( zonename ) {
- delete zonename;
- }
- zonename = strdup( zone.c_str() );
- currGMT = get_gmt( gmtime(&cur_time) );
- aircraftLocalTime = get_gmt( (fgLocaltime(&cur_time, zone.c_str())) );
- localOffset = aircraftLocalTime - currGMT;
- // cerr << "Using " << localOffset << " as local time offset Timezone is "
- // << zonename << endl;
-}
-
-// Initialize the time dependent variables (maybe I'll put this in the
-// constructor later)
-void FGTime::init( double lon, double lat, const string& root,
- time_t timeOffset, sgTimingOffsetType offsetType )
-{
- FG_LOG( FG_EVENT, FG_INFO, "Initializing Time" );
- gst_diff = -9999.0;
- FG_LOG( FG_EVENT, FG_DEBUG,
- "time offset = " << timeOffset );
- // time_t timeOffset = current_options.get_time_offset();
- // int offsetType = current_options.get_time_offset_type();
-
- time_t currGMT;
- time_t systemLocalTime;
- time_t aircraftLocalTime;
-
- // would it be better to put these sanity checks in the options
- // parsing code? (CLO)
-
- cur_time = time(NULL);
-
- // printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- // printf ("Current local time = %24s", asctime(localtime(&cur_time)));
- // time_t tmp = cur_time;
- GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
-
- GeoCoord* nearestTz = tzContainer->getNearest(location);
-
- FGPath zone( root );
- zone.append( "Timezone" );
- zone.append( nearestTz->getDescription() );
-
- // printf("Using %s for timezone information\n", buffer);
- zonename = strdup( zone.c_str() );
- //show( buffer.c_str(), cur_time, 1);
- //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
- currGMT = get_gmt( gmtime(&cur_time) );
- systemLocalTime = get_gmt( localtime(&cur_time) );
- aircraftLocalTime = get_gmt( fgLocaltime(&cur_time, zone.c_str()) );
- //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
-
- //printf("LT = %d\n", computerLocalTime);
- // Okay, in principle, this trick allows to calculate the
- // difference between GMT and localtime, in seconds.
- // printf("Gmt = %d, SLT = %d, (difference = %d)\n", currGMT, systemLocalTime, (currGMT - systemLocalTime));
- // printf("Gmt = %d, ALT = %d, (difference = %d)\n", currGMT, aircraftLocalTime, (currGMT - aircraftLocalTime));
- // exit(1);
- // Okay, we now have six possible scenarios
- switch (offsetType)
- {
- case SG_TIME_SYS_OFFSET:
- warp = timeOffset;
- break;
- case SG_TIME_GMT_OFFSET:
- warp = timeOffset - (currGMT - systemLocalTime);
- break;
- case SG_TIME_LAT_OFFSET:
- // warp = timeOffset - (currGMT - systemLocalTime +
- // (currGMT - aircraftLocalTime));
- warp = timeOffset - (aircraftLocalTime - systemLocalTime);
- break;
- case SG_TIME_SYS_ABSOLUTE:
- warp = timeOffset - cur_time;
- //printf("warp = %d\n", warp);
- break;
- case SG_TIME_GMT_ABSOLUTE:
- warp = timeOffset - currGMT;
- break;
- case SG_TIME_LAT_ABSOLUTE:
- warp = timeOffset - (aircraftLocalTime - systemLocalTime) -
- cur_time;
- break;
- default:
- printf("Unsupported type\n");
- exit(1);
- }
-
- warp_delta = 0;
- // pause = current_options.get_pause();
-}
-
-
-// given a date in months, mn, days, dy, years, yr, return the
-// modified Julian date (number of days elapsed since 1900 jan 0.5),
-// mjd. Adapted from Xephem.
-
-void FGTime::cal_mjd (int mn, double dy, int yr)
-{
- //static double last_mjd, last_dy;
- //double mjd;
- //static int last_mn, last_yr;
- int b, d, m, y;
- long c;
-
- if (mn == last_mn && yr == last_yr && dy == last_dy) {
- mjd = last_mjd;
- //return(mjd);
- }
-
- m = mn;
- y = (yr < 0) ? yr + 1 : yr;
- if (mn < 3) {
- m += 12;
- y -= 1;
- }
-
- if (yr < 1582 || (yr == 1582 && (mn < 10 || (mn == 10 && dy < 15)))) {
- b = 0;
- } else {
- int a;
- a = y/100;
- b = 2 - a + a/4;
- }
-
- if (y < 0) {
- c = (long)((365.25*y) - 0.75) - 694025L;
- } else {
- c = (long)(365.25*y) - 694025L;
- }
-
- d = (int)(30.6001*(m+1));
-
- mjd = b + c + d + dy - 0.5;
-
- last_mn = mn;
- last_dy = dy;
- last_yr = yr;
- last_mjd = mjd;
-
- //return(mjd);
-}
-
-
-// given an mjd, calculate greenwich mean sidereal time, gst
-void FGTime::utc_gst ()
-{
- double day = floor(mjd-0.5)+0.5;
- double hr = (mjd-day)*24.0;
- double T, x;
-
- T = ((int)(mjd - 0.5) + 0.5 - J2000)/36525.0;
- x = 24110.54841 + (8640184.812866 + (0.093104 - 6.2e-6 * T) * T) * T;
- x /= 3600.0;
- gst = (1.0/SIDRATE)*hr + x;
-
- FG_LOG( FG_EVENT, FG_DEBUG, " gst => " << gst );
-}
-
-
-// given Julian Date and Longitude (decimal degrees West) compute
-// Local Sidereal Time, in decimal hours.
-//
-// Provided courtesy of ecdowney@noao.edu (Elwood Downey)
-
-double FGTime::sidereal_precise (double lng)
-{
- double lstTmp;
-
- /* printf ("Current Lst on JD %13.5f at %8.4f degrees West: ",
- mjd + MJD0, lng); */
-
- // convert to required internal units
- lng *= DEG_TO_RAD;
-
- // compute LST and print
- utc_gst();
- lstTmp = gst - RADHR (lng);
- lstTmp -= 24.0*floor(lstTmp/24.0);
- // printf ("%7.4f\n", lstTmp);
-
- // that's all
- return (lstTmp);
-}
-
-
-// return a courser but cheaper estimate of sidereal time
-double FGTime::sidereal_course(double lng)
-{
- //struct tm *gmt;
- //double lstTmp;
- time_t start_gmt, now;
- double diff, part, days, hours, lstTmp;
- char tbuf[64];
-
- //gmt = t->gmt;
- //now = t->cur_time;
- now = cur_time;
- start_gmt = get_gmt(gmt->tm_year, 2, 21, 12, 0, 0);
-
- FG_LOG( FG_EVENT, FG_DEBUG, " COURSE: GMT = " << format_time(gmt, tbuf) );
- FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (GMT) = " << start_gmt );
-
- diff = (now - start_gmt) / (3600.0 * 24.0);
-
- FG_LOG( FG_EVENT, FG_DEBUG,
- " Time since 3/21/" << gmt->tm_year << " GMT = " << diff );
-
- part = fmod(diff, 1.0);
- days = diff - part;
- hours = gmt->tm_hour + gmt->tm_min/60.0 + gmt->tm_sec/3600.0;
-
- lstTmp = (days - lng)/15.0 + hours - 12;
-
- while ( lstTmp < 0.0 ) {
- lstTmp += 24.0;
- }
-
- FG_LOG( FG_EVENT, FG_DEBUG,
- " days = " << days << " hours = " << hours << " lon = "
- << lng << " lst = " << lstTmp );
-
- return(lstTmp);
-}
-
-
-// Update time variables such as gmt, julian date, and sidereal time
-void FGTime::update( double lon, double lat, double alt_m ) {
- double gst_precise, gst_course;
-
- FG_LOG( FG_EVENT, FG_DEBUG, "Updating time" );
-
- // get current Unix calendar time (in seconds)
- warp += warp_delta;
- cur_time = time(NULL) + warp;
- FG_LOG( FG_EVENT, FG_DEBUG,
- " Current Unix calendar time = " << cur_time
- << " warp = " << warp << " delta = " << warp_delta );
-
-#if 0
- if ( warp_delta ) {
- // time is changing so force an update
- local_update_sky_and_lighting_params();
- }
-#endif
-
- // get GMT break down for current time
- gmt = gmtime(&cur_time);
- FG_LOG( FG_EVENT, FG_DEBUG,
- " Current GMT = " << gmt->tm_mon+1 << "/"
- << gmt->tm_mday << "/" << gmt->tm_year << " "
- << gmt->tm_hour << ":" << gmt->tm_min << ":"
- << gmt->tm_sec );
-
- // calculate modified Julian date
- // t->mjd = cal_mjd ((int)(t->gmt->tm_mon+1), (double)t->gmt->tm_mday,
- // (int)(t->gmt->tm_year + 1900));
- cal_mjd ((int)(gmt->tm_mon+1), (double)gmt->tm_mday,
- (int)(gmt->tm_year + 1900));
-
- // add in partial day
- mjd += (gmt->tm_hour / 24.0) + (gmt->tm_min / (24.0 * 60.0)) +
- (gmt->tm_sec / (24.0 * 60.0 * 60.0));
-
- // convert "back" to Julian date + partial day (as a fraction of one)
- jd = mjd + MJD0;
- FG_LOG( FG_EVENT, FG_DEBUG, " Current Julian Date = " << jd );
-
- // printf(" Current Longitude = %.3f\n", FG_Longitude * RAD_TO_DEG);
-
- // Calculate local side real time
- if ( gst_diff < -100.0 ) {
- // first time through do the expensive calculation & cheap
- // calculation to get the difference.
- FG_LOG( FG_EVENT, FG_INFO, " First time, doing precise gst" );
- gst_precise = gst = sidereal_precise(0.00);
- gst_course = sidereal_course(0.00);
-
- gst_diff = gst_precise - gst_course;
-
- lst = sidereal_course(-(lon * RAD_TO_DEG)) + gst_diff;
- } else {
- // course + difference should drift off very slowly
- gst = sidereal_course( 0.00 ) + gst_diff;
- lst = sidereal_course( -(lon * RAD_TO_DEG)) + gst_diff;
- }
-
- FG_LOG( FG_EVENT, FG_DEBUG,
- " Current lon=0.00 Sidereal Time = " << gst );
- FG_LOG( FG_EVENT, FG_DEBUG,
- " Current LOCAL Sidereal Time = " << lst << " ("
- << sidereal_precise(-(lon * RAD_TO_DEG))
- << ") (diff = " << gst_diff << ")" );
-}
-
-
-/******************************************************************
- * The following are some functions that were included as FGTime
- * members, although they currently don't make use of any of the
- * class's variables. Maybe this'll change in the future
- *****************************************************************/
-
-// Return time_t for Sat Mar 21 12:00:00 GMT
-//
-// On many systems it is ambiguous if mktime() assumes the input is in
-// GMT, or local timezone. To address this, a new function called
-// timegm() is appearing. It works exactly like mktime() but
-// explicitely interprets the input as GMT.
-//
-// timegm() is available and documented under FreeBSD. It is
-// available, but completely undocumented on my current Debian 2.1
-// distribution.
-//
-// In the absence of timegm() we have to guess what mktime() might do.
-//
-// Many older BSD style systems have a mktime() that assumes the input
-// time in GMT. But FreeBSD explicitly states that mktime() assumes
-// local time zone
-//
-// The mktime() on many SYSV style systems (such as Linux) usually
-// returns its result assuming you have specified the input time in
-// your local timezone. Therefore, in the absence if timegm() you
-// have to go to extra trouble to convert back to GMT.
-//
-// If you are having problems with incorrectly positioned astronomical
-// bodies, this is a really good place to start looking.
-
-time_t FGTime::get_gmt(int year, int month, int day, int hour, int min, int sec)
-{
- struct tm mt;
-
- mt.tm_mon = month;
- mt.tm_mday = day;
- mt.tm_year = year;
- mt.tm_hour = hour;
- mt.tm_min = min;
- mt.tm_sec = sec;
- mt.tm_isdst = -1; // let the system determine the proper time zone
-
- // For now we assume that if daylight is not defined in
- // /usr/include/time.h that we have a machine with a mktime() that
- // assumes input is in GMT ... this only matters if we are
- // building on a system that does not have timegm()
-#if !defined(HAVE_DAYLIGHT)
-# define MK_TIME_IS_GMT 1
-#endif
-
-#if defined( HAVE_TIMEGM )
- return ( timegm(&mt) );
-#elif defined( MK_TIME_IS_GMT )
- return ( mktime(&mt) );
-#else // ! defined ( MK_TIME_IS_GMT )
-
- // timezone seems to work as a proper offset for Linux & Solaris
-# if defined( __linux__ ) || defined( __sun__ )
-# define TIMEZONE_OFFSET_WORKS 1
-# endif
-
- long int start = mktime(&mt);
-
- FG_LOG( FG_EVENT, FG_DEBUG, "start1 = " << start );
- // the ctime() call can screw up time progression on some versions
- // of Linux
- // fgPrintf( FG_EVENT, FG_DEBUG, "start2 = %s", ctime(&start));
- FG_LOG( FG_EVENT, FG_DEBUG, "(tm_isdst = " << mt.tm_isdst << ")" );
-
- timezone = fix_up_timezone( timezone );
-
-# if defined( TIMEZONE_OFFSET_WORKS )
- FG_LOG( FG_EVENT, FG_DEBUG,
- "start = " << start << ", timezone = " << timezone );
- return( start - timezone );
-# else // ! defined( TIMEZONE_OFFSET_WORKS )
-
- daylight = mt.tm_isdst;
- if ( daylight > 0 ) {
- daylight = 1;
- } else if ( daylight < 0 ) {
- FG_LOG( FG_EVENT, FG_WARN,
- "OOOPS, problem in fg_time.cxx, no daylight savings info." );
- }
-
- long int offset = -(timezone / 3600 - daylight);
-
- FG_LOG( FG_EVENT, FG_DEBUG, " Raw time zone offset = " << timezone );
- FG_LOG( FG_EVENT, FG_DEBUG, " Daylight Savings = " << daylight );
- FG_LOG( FG_EVENT, FG_DEBUG, " Local hours from GMT = " << offset );
-
- long int start_gmt = start - timezone + (daylight * 3600);
-
- FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (CST) = " << start );
-
- return ( start_gmt );
-# endif // ! defined( TIMEZONE_OFFSET_WORKS )
-#endif // ! defined ( MK_TIME_IS_GMT )
-}
-
-// Fix up timezone if using ftime()
-long int FGTime::fix_up_timezone( long int timezone_orig )
-{
-#if !defined( HAVE_GETTIMEOFDAY ) && defined( HAVE_FTIME )
- // ftime() needs a little extra help finding the current timezone
- struct timeb current;
- ftime(¤t);
- return( current.timezone * 60 );
-#else
- return( timezone_orig );
-#endif
-}
-
-
-char* FGTime::format_time( const struct tm* p, char* buf )
-{
- sprintf( buf, "%d/%d/%2d %d:%02d:%02d",
- p->tm_mon, p->tm_mday, p->tm_year,
- p->tm_hour, p->tm_min, p->tm_sec);
- return buf;
-}
-
-
-#if 0
-// Force an update of the sky and lighting parameters
-void FGTime::local_update_sky_and_lighting_params( void ) {
- fgUpdateSunPos();
- fgUpdateMoonPos();
- cur_light_params.Update();
-}
-#endif
-
-
-FGTime* FGTime::cur_time_params = 0;
+++ /dev/null
-// fg_time.hxx -- data structures and routines for managing time related stuff.
-//
-// Written by Curtis Olson, started August 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.
-//
-// $Id$
-
-
-#ifndef _FG_TIME_HXX
-#define _FG_TIME_HXX
-
-
-#ifndef __cplusplus
-# error This library requires C++
-#endif
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#ifdef HAVE_WINDOWS_H
-# include <windows.h>
-#endif
-
-#include <GL/glut.h>
-
-#include <simgear/compiler.h>
-
-#ifdef FG_HAVE_STD_INCLUDES
-# include <ctime>
-#else
-# include <time.h>
-#endif
-
-// #include <FDM/flight.hxx>
-
-#include "timezone.h"
-// #include "lowleveltime.h"
-
-
-enum sgTimingOffsetType {
- SG_TIME_SYS_OFFSET = 0,
- SG_TIME_GMT_OFFSET = 1,
- SG_TIME_LAT_OFFSET = 2,
- SG_TIME_SYS_ABSOLUTE = 3,
- SG_TIME_GMT_ABSOLUTE = 4,
- SG_TIME_LAT_ABSOLUTE = 5
-};
-
-
-// Define a structure containing time parameters
-class FGTime {
-
-private:
- // tzContainer stores all the current Timezone control points/
- TimezoneContainer* tzContainer;
-
- //Store the current local timezone name;
- char *zonename;
-
- // Unix "calendar" time in seconds
- time_t cur_time;
-
- // Break down of GMT time
- struct tm *gmt;
-
- // Julian date
- double jd;
-
- // modified Julian date
- double mjd;
-
- double last_mjd, last_dy;
- int last_mn, last_yr;
-
- // side real time at prime meridian
- double gst;
-
- // local sidereal time
- double lst;
-
- // local offset to GMT
- time_t localOffset;
-
- // the difference between the precise sidereal time algorithm
- // result and the course result. course + diff has good accuracy
- // for the short term
- double gst_diff;
-
- // An offset in seconds from the true time. Allows us to adjust
- // the effective time of day.
- long int warp;
-
- // How much to change the value of warp each iteration. Allows us
- // to make time progress faster than normal.
- long int warp_delta;
-
-public:
-
- FGTime( const string& root );
- ~FGTime();
-
- inline double getJD() const { return jd; };
- inline double getMjd() const { return mjd; };
- inline double getLst() const { return lst; };
- inline double getGst() const { return gst; };
- inline time_t get_cur_time() const { return cur_time; };
- inline struct tm* getGmt()const { return gmt; };
-
- void adjust_warp(int val) { warp += val; };
- void adjust_warp_delta(int val) { warp_delta += val; };
-
- // Initialize the time dependent variables
- void init( double lon, double lat, const string& root,
- time_t timeOffset, sgTimingOffsetType offsetType );
-
- // Update the time dependent variables
- void update( double lon, double lat, double alt_m );
- void updateLocal( double lon, double lat, const string& root );
-
- void cal_mjd (int mn, double dy, int yr);
- void utc_gst();
- double sidereal_precise (double lng);
- double sidereal_course(double lng);
- static FGTime *cur_time_params;
-
- // Some other stuff which were changed to FGTime members on
- // questionable grounds -:)
- // time_t get_start_gmt(int year);
- time_t get_gmt(int year, int month, int day,
- int hour, int minute, int second);
- time_t get_gmt(struct tm* the_time);
-
- char* format_time( const struct tm* p, char* buf );
- long int fix_up_timezone( long int timezone_orig );
-
- inline int get_warp_delta() const { return warp_delta; }
-};
-
-
-inline time_t FGTime::get_gmt(struct tm* the_time) // this is just a wrapper
-{
- //printf("Using: %24s as input\n", asctime(the_time));
- return get_gmt(the_time->tm_year,
- the_time->tm_mon,
- the_time->tm_mday,
- the_time->tm_hour,
- the_time->tm_min,
- the_time->tm_sec);
-}
-
-
-#endif // _FG_TIME_HXX
--- /dev/null
+// sg_time.cxx -- data structures and routines for managing time related stuff.
+//
+// Written by Curtis Olson, started August 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.
+//
+// $Id$
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <simgear/compiler.h>
+
+#ifdef FG_HAVE_STD_INCLUDES
+# include <cmath>
+# include <cstdio>
+# include <cstdlib>
+# include <ctime>
+#else
+# include <math.h>
+# include <stdio.h>
+# include <stdlib.h>
+# include <time.h>
+#endif
+
+#ifdef HAVE_SYS_TIMEB_H
+# include <sys/timeb.h> // for ftime() and struct timeb
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h> // for gettimeofday()
+#endif
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h> // for get/setitimer, gettimeofday, struct timeval
+#endif
+
+#include <simgear/constants.h>
+#include <simgear/debug/logstream.hxx>
+// #include <simgear/magvar/magvar.hxx>
+#include <simgear/misc/fgpath.hxx>
+
+// #include <FDM/flight.hxx>
+// #include <Main/options.hxx>
+// #include <Time/light.hxx>
+
+#include "sg_time.hxx"
+#include "timezone.h"
+#include "lowleveltime.h"
+// #include "moonpos.hxx"
+// #include "sunpos.hxx"
+
+
+#define DEGHR(x) ((x)/15.)
+#define RADHR(x) DEGHR(x*RAD_TO_DEG)
+
+
+// #define MK_TIME_IS_GMT 0 // default value
+// #define TIME_ZONE_OFFSET_WORK 0 // default value
+
+
+SGTime::SGTime( const string& root )
+{
+ if (cur_time_params) {
+ FG_LOG( FG_GENERAL, FG_ALERT,
+ "Error: only one instance of SGTime allowed" );
+ exit(-1);
+ }
+
+ cur_time_params = this;
+
+ FGPath zone( root );
+ zone.append( "Timezone" );
+ zone.append( "zone.tab" );
+
+ FG_LOG( FG_EVENT, FG_INFO, "Reading timezone info from: " << zone.str() );
+ tzContainer = new TimezoneContainer( zone.c_str() );
+ warp=0;
+ warp_delta=0;
+}
+
+
+SGTime::~SGTime()
+{
+ delete tzContainer;
+ delete zonename;
+}
+
+void SGTime::updateLocal( double lon, double lat, const string& root )
+{
+ time_t currGMT;
+ time_t aircraftLocalTime;
+ GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
+ GeoCoord* nearestTz = tzContainer->getNearest(location);
+ FGPath zone( root );
+ zone.append ("Timezone" );
+ zone.append ( nearestTz->getDescription() );
+ if ( zonename ) {
+ delete zonename;
+ }
+ zonename = strdup( zone.c_str() );
+ currGMT = get_gmt( gmtime(&cur_time) );
+ aircraftLocalTime = get_gmt( (fgLocaltime(&cur_time, zone.c_str())) );
+ localOffset = aircraftLocalTime - currGMT;
+ // cerr << "Using " << localOffset << " as local time offset Timezone is "
+ // << zonename << endl;
+}
+
+// Initialize the time dependent variables (maybe I'll put this in the
+// constructor later)
+void SGTime::init( double lon, double lat, const string& root,
+ time_t timeOffset, sgTimingOffsetType offsetType )
+{
+ FG_LOG( FG_EVENT, FG_INFO, "Initializing Time" );
+ gst_diff = -9999.0;
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ "time offset = " << timeOffset );
+ // time_t timeOffset = current_options.get_time_offset();
+ // int offsetType = current_options.get_time_offset_type();
+
+ time_t currGMT;
+ time_t systemLocalTime;
+ time_t aircraftLocalTime;
+
+ // would it be better to put these sanity checks in the options
+ // parsing code? (CLO)
+
+ cur_time = time(NULL);
+
+ // printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
+ // printf ("Current local time = %24s", asctime(localtime(&cur_time)));
+ // time_t tmp = cur_time;
+ GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
+
+ GeoCoord* nearestTz = tzContainer->getNearest(location);
+
+ FGPath zone( root );
+ zone.append( "Timezone" );
+ zone.append( nearestTz->getDescription() );
+
+ // printf("Using %s for timezone information\n", buffer);
+ zonename = strdup( zone.c_str() );
+ //show( buffer.c_str(), cur_time, 1);
+ //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
+ //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
+ currGMT = get_gmt( gmtime(&cur_time) );
+ systemLocalTime = get_gmt( localtime(&cur_time) );
+ aircraftLocalTime = get_gmt( fgLocaltime(&cur_time, zone.c_str()) );
+ //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
+ //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
+
+ //printf("LT = %d\n", computerLocalTime);
+ // Okay, in principle, this trick allows to calculate the
+ // difference between GMT and localtime, in seconds.
+ // printf("Gmt = %d, SLT = %d, (difference = %d)\n", currGMT, systemLocalTime, (currGMT - systemLocalTime));
+ // printf("Gmt = %d, ALT = %d, (difference = %d)\n", currGMT, aircraftLocalTime, (currGMT - aircraftLocalTime));
+ // exit(1);
+ // Okay, we now have six possible scenarios
+ switch (offsetType)
+ {
+ case SG_TIME_SYS_OFFSET:
+ warp = timeOffset;
+ break;
+ case SG_TIME_GMT_OFFSET:
+ warp = timeOffset - (currGMT - systemLocalTime);
+ break;
+ case SG_TIME_LAT_OFFSET:
+ // warp = timeOffset - (currGMT - systemLocalTime +
+ // (currGMT - aircraftLocalTime));
+ warp = timeOffset - (aircraftLocalTime - systemLocalTime);
+ break;
+ case SG_TIME_SYS_ABSOLUTE:
+ warp = timeOffset - cur_time;
+ //printf("warp = %d\n", warp);
+ break;
+ case SG_TIME_GMT_ABSOLUTE:
+ warp = timeOffset - currGMT;
+ break;
+ case SG_TIME_LAT_ABSOLUTE:
+ warp = timeOffset - (aircraftLocalTime - systemLocalTime) -
+ cur_time;
+ break;
+ default:
+ printf("Unsupported type\n");
+ exit(1);
+ }
+
+ warp_delta = 0;
+ // pause = current_options.get_pause();
+}
+
+
+// given a date in months, mn, days, dy, years, yr, return the
+// modified Julian date (number of days elapsed since 1900 jan 0.5),
+// mjd. Adapted from Xephem.
+
+void SGTime::cal_mjd (int mn, double dy, int yr)
+{
+ //static double last_mjd, last_dy;
+ //double mjd;
+ //static int last_mn, last_yr;
+ int b, d, m, y;
+ long c;
+
+ if (mn == last_mn && yr == last_yr && dy == last_dy) {
+ mjd = last_mjd;
+ //return(mjd);
+ }
+
+ m = mn;
+ y = (yr < 0) ? yr + 1 : yr;
+ if (mn < 3) {
+ m += 12;
+ y -= 1;
+ }
+
+ if (yr < 1582 || (yr == 1582 && (mn < 10 || (mn == 10 && dy < 15)))) {
+ b = 0;
+ } else {
+ int a;
+ a = y/100;
+ b = 2 - a + a/4;
+ }
+
+ if (y < 0) {
+ c = (long)((365.25*y) - 0.75) - 694025L;
+ } else {
+ c = (long)(365.25*y) - 694025L;
+ }
+
+ d = (int)(30.6001*(m+1));
+
+ mjd = b + c + d + dy - 0.5;
+
+ last_mn = mn;
+ last_dy = dy;
+ last_yr = yr;
+ last_mjd = mjd;
+
+ //return(mjd);
+}
+
+
+// given an mjd, calculate greenwich mean sidereal time, gst
+void SGTime::utc_gst ()
+{
+ double day = floor(mjd-0.5)+0.5;
+ double hr = (mjd-day)*24.0;
+ double T, x;
+
+ T = ((int)(mjd - 0.5) + 0.5 - J2000)/36525.0;
+ x = 24110.54841 + (8640184.812866 + (0.093104 - 6.2e-6 * T) * T) * T;
+ x /= 3600.0;
+ gst = (1.0/SIDRATE)*hr + x;
+
+ FG_LOG( FG_EVENT, FG_DEBUG, " gst => " << gst );
+}
+
+
+// given Julian Date and Longitude (decimal degrees West) compute
+// Local Sidereal Time, in decimal hours.
+//
+// Provided courtesy of ecdowney@noao.edu (Elwood Downey)
+
+double SGTime::sidereal_precise (double lng)
+{
+ double lstTmp;
+
+ /* printf ("Current Lst on JD %13.5f at %8.4f degrees West: ",
+ mjd + MJD0, lng); */
+
+ // convert to required internal units
+ lng *= DEG_TO_RAD;
+
+ // compute LST and print
+ utc_gst();
+ lstTmp = gst - RADHR (lng);
+ lstTmp -= 24.0*floor(lstTmp/24.0);
+ // printf ("%7.4f\n", lstTmp);
+
+ // that's all
+ return (lstTmp);
+}
+
+
+// return a courser but cheaper estimate of sidereal time
+double SGTime::sidereal_course(double lng)
+{
+ //struct tm *gmt;
+ //double lstTmp;
+ time_t start_gmt, now;
+ double diff, part, days, hours, lstTmp;
+ char tbuf[64];
+
+ //gmt = t->gmt;
+ //now = t->cur_time;
+ now = cur_time;
+ start_gmt = get_gmt(gmt->tm_year, 2, 21, 12, 0, 0);
+
+ FG_LOG( FG_EVENT, FG_DEBUG, " COURSE: GMT = " << format_time(gmt, tbuf) );
+ FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (GMT) = " << start_gmt );
+
+ diff = (now - start_gmt) / (3600.0 * 24.0);
+
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " Time since 3/21/" << gmt->tm_year << " GMT = " << diff );
+
+ part = fmod(diff, 1.0);
+ days = diff - part;
+ hours = gmt->tm_hour + gmt->tm_min/60.0 + gmt->tm_sec/3600.0;
+
+ lstTmp = (days - lng)/15.0 + hours - 12;
+
+ while ( lstTmp < 0.0 ) {
+ lstTmp += 24.0;
+ }
+
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " days = " << days << " hours = " << hours << " lon = "
+ << lng << " lst = " << lstTmp );
+
+ return(lstTmp);
+}
+
+
+// Update time variables such as gmt, julian date, and sidereal time
+void SGTime::update( double lon, double lat, double alt_m ) {
+ double gst_precise, gst_course;
+
+ FG_LOG( FG_EVENT, FG_DEBUG, "Updating time" );
+
+ // get current Unix calendar time (in seconds)
+ warp += warp_delta;
+ cur_time = time(NULL) + warp;
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " Current Unix calendar time = " << cur_time
+ << " warp = " << warp << " delta = " << warp_delta );
+
+#if 0
+ if ( warp_delta ) {
+ // time is changing so force an update
+ local_update_sky_and_lighting_params();
+ }
+#endif
+
+ // get GMT break down for current time
+ gmt = gmtime(&cur_time);
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " Current GMT = " << gmt->tm_mon+1 << "/"
+ << gmt->tm_mday << "/" << gmt->tm_year << " "
+ << gmt->tm_hour << ":" << gmt->tm_min << ":"
+ << gmt->tm_sec );
+
+ // calculate modified Julian date
+ // t->mjd = cal_mjd ((int)(t->gmt->tm_mon+1), (double)t->gmt->tm_mday,
+ // (int)(t->gmt->tm_year + 1900));
+ cal_mjd ((int)(gmt->tm_mon+1), (double)gmt->tm_mday,
+ (int)(gmt->tm_year + 1900));
+
+ // add in partial day
+ mjd += (gmt->tm_hour / 24.0) + (gmt->tm_min / (24.0 * 60.0)) +
+ (gmt->tm_sec / (24.0 * 60.0 * 60.0));
+
+ // convert "back" to Julian date + partial day (as a fraction of one)
+ jd = mjd + MJD0;
+ FG_LOG( FG_EVENT, FG_DEBUG, " Current Julian Date = " << jd );
+
+ // printf(" Current Longitude = %.3f\n", FG_Longitude * RAD_TO_DEG);
+
+ // Calculate local side real time
+ if ( gst_diff < -100.0 ) {
+ // first time through do the expensive calculation & cheap
+ // calculation to get the difference.
+ FG_LOG( FG_EVENT, FG_INFO, " First time, doing precise gst" );
+ gst_precise = gst = sidereal_precise(0.00);
+ gst_course = sidereal_course(0.00);
+
+ gst_diff = gst_precise - gst_course;
+
+ lst = sidereal_course(-(lon * RAD_TO_DEG)) + gst_diff;
+ } else {
+ // course + difference should drift off very slowly
+ gst = sidereal_course( 0.00 ) + gst_diff;
+ lst = sidereal_course( -(lon * RAD_TO_DEG)) + gst_diff;
+ }
+
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " Current lon=0.00 Sidereal Time = " << gst );
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ " Current LOCAL Sidereal Time = " << lst << " ("
+ << sidereal_precise(-(lon * RAD_TO_DEG))
+ << ") (diff = " << gst_diff << ")" );
+}
+
+
+/******************************************************************
+ * The following are some functions that were included as SGTime
+ * members, although they currently don't make use of any of the
+ * class's variables. Maybe this'll change in the future
+ *****************************************************************/
+
+// Return time_t for Sat Mar 21 12:00:00 GMT
+//
+// On many systems it is ambiguous if mktime() assumes the input is in
+// GMT, or local timezone. To address this, a new function called
+// timegm() is appearing. It works exactly like mktime() but
+// explicitely interprets the input as GMT.
+//
+// timegm() is available and documented under FreeBSD. It is
+// available, but completely undocumented on my current Debian 2.1
+// distribution.
+//
+// In the absence of timegm() we have to guess what mktime() might do.
+//
+// Many older BSD style systems have a mktime() that assumes the input
+// time in GMT. But FreeBSD explicitly states that mktime() assumes
+// local time zone
+//
+// The mktime() on many SYSV style systems (such as Linux) usually
+// returns its result assuming you have specified the input time in
+// your local timezone. Therefore, in the absence if timegm() you
+// have to go to extra trouble to convert back to GMT.
+//
+// If you are having problems with incorrectly positioned astronomical
+// bodies, this is a really good place to start looking.
+
+time_t SGTime::get_gmt(int year, int month, int day, int hour, int min, int sec)
+{
+ struct tm mt;
+
+ mt.tm_mon = month;
+ mt.tm_mday = day;
+ mt.tm_year = year;
+ mt.tm_hour = hour;
+ mt.tm_min = min;
+ mt.tm_sec = sec;
+ mt.tm_isdst = -1; // let the system determine the proper time zone
+
+ // For now we assume that if daylight is not defined in
+ // /usr/include/time.h that we have a machine with a mktime() that
+ // assumes input is in GMT ... this only matters if we are
+ // building on a system that does not have timegm()
+#if !defined(HAVE_DAYLIGHT)
+# define MK_TIME_IS_GMT 1
+#endif
+
+#if defined( HAVE_TIMEGM )
+ return ( timegm(&mt) );
+#elif defined( MK_TIME_IS_GMT )
+ return ( mktime(&mt) );
+#else // ! defined ( MK_TIME_IS_GMT )
+
+ // timezone seems to work as a proper offset for Linux & Solaris
+# if defined( __linux__ ) || defined( __sun__ )
+# define TIMEZONE_OFFSET_WORKS 1
+# endif
+
+ long int start = mktime(&mt);
+
+ FG_LOG( FG_EVENT, FG_DEBUG, "start1 = " << start );
+ // the ctime() call can screw up time progression on some versions
+ // of Linux
+ // fgPrintf( FG_EVENT, FG_DEBUG, "start2 = %s", ctime(&start));
+ FG_LOG( FG_EVENT, FG_DEBUG, "(tm_isdst = " << mt.tm_isdst << ")" );
+
+ timezone = fix_up_timezone( timezone );
+
+# if defined( TIMEZONE_OFFSET_WORKS )
+ FG_LOG( FG_EVENT, FG_DEBUG,
+ "start = " << start << ", timezone = " << timezone );
+ return( start - timezone );
+# else // ! defined( TIMEZONE_OFFSET_WORKS )
+
+ daylight = mt.tm_isdst;
+ if ( daylight > 0 ) {
+ daylight = 1;
+ } else if ( daylight < 0 ) {
+ FG_LOG( FG_EVENT, FG_WARN,
+ "OOOPS, problem in sg_time.cxx, no daylight savings info." );
+ }
+
+ long int offset = -(timezone / 3600 - daylight);
+
+ FG_LOG( FG_EVENT, FG_DEBUG, " Raw time zone offset = " << timezone );
+ FG_LOG( FG_EVENT, FG_DEBUG, " Daylight Savings = " << daylight );
+ FG_LOG( FG_EVENT, FG_DEBUG, " Local hours from GMT = " << offset );
+
+ long int start_gmt = start - timezone + (daylight * 3600);
+
+ FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (CST) = " << start );
+
+ return ( start_gmt );
+# endif // ! defined( TIMEZONE_OFFSET_WORKS )
+#endif // ! defined ( MK_TIME_IS_GMT )
+}
+
+// Fix up timezone if using ftime()
+long int SGTime::fix_up_timezone( long int timezone_orig )
+{
+#if !defined( HAVE_GETTIMEOFDAY ) && defined( HAVE_FTIME )
+ // ftime() needs a little extra help finding the current timezone
+ struct timeb current;
+ ftime(¤t);
+ return( current.timezone * 60 );
+#else
+ return( timezone_orig );
+#endif
+}
+
+
+char* SGTime::format_time( const struct tm* p, char* buf )
+{
+ sprintf( buf, "%d/%d/%2d %d:%02d:%02d",
+ p->tm_mon, p->tm_mday, p->tm_year,
+ p->tm_hour, p->tm_min, p->tm_sec);
+ return buf;
+}
+
+
+SGTime* SGTime::cur_time_params = 0;
--- /dev/null
+// sg_time.hxx -- data structures and routines for managing time related stuff.
+//
+// Written by Curtis Olson, started August 1997.
+//
+// Copyright (C) 1997 Curtis L. Olson - curt@flightgear.org
+//
+// 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 _SG_TIME_HXX
+#define _SG_TIME_HXX
+
+
+#ifndef __cplusplus
+# error This library requires C++
+#endif
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifdef HAVE_WINDOWS_H
+# include <windows.h>
+#endif
+
+#include <GL/glut.h>
+
+#include <simgear/compiler.h>
+
+#ifdef FG_HAVE_STD_INCLUDES
+# include <ctime>
+#else
+# include <time.h>
+#endif
+
+// #include <FDM/flight.hxx>
+
+#include "timezone.h"
+// #include "lowleveltime.h"
+
+
+enum sgTimingOffsetType {
+ SG_TIME_SYS_OFFSET = 0,
+ SG_TIME_GMT_OFFSET = 1,
+ SG_TIME_LAT_OFFSET = 2,
+ SG_TIME_SYS_ABSOLUTE = 3,
+ SG_TIME_GMT_ABSOLUTE = 4,
+ SG_TIME_LAT_ABSOLUTE = 5
+};
+
+
+// Define a structure containing time parameters
+class SGTime {
+
+private:
+ // tzContainer stores all the current Timezone control points/
+ TimezoneContainer* tzContainer;
+
+ //Store the current local timezone name;
+ char *zonename;
+
+ // Unix "calendar" time in seconds
+ time_t cur_time;
+
+ // Break down of GMT time
+ struct tm *gmt;
+
+ // Julian date
+ double jd;
+
+ // modified Julian date
+ double mjd;
+
+ double last_mjd, last_dy;
+ int last_mn, last_yr;
+
+ // side real time at prime meridian
+ double gst;
+
+ // local sidereal time
+ double lst;
+
+ // local offset to GMT
+ time_t localOffset;
+
+ // the difference between the precise sidereal time algorithm
+ // result and the course result. course + diff has good accuracy
+ // for the short term
+ double gst_diff;
+
+ // An offset in seconds from the true time. Allows us to adjust
+ // the effective time of day.
+ long int warp;
+
+ // How much to change the value of warp each iteration. Allows us
+ // to make time progress faster than normal.
+ long int warp_delta;
+
+public:
+
+ SGTime( const string& root );
+ ~SGTime();
+
+ inline double getJD() const { return jd; };
+ inline double getMjd() const { return mjd; };
+ inline double getLst() const { return lst; };
+ inline double getGst() const { return gst; };
+ inline time_t get_cur_time() const { return cur_time; };
+ inline struct tm* getGmt()const { return gmt; };
+
+ void adjust_warp(int val) { warp += val; };
+ void adjust_warp_delta(int val) { warp_delta += val; };
+
+ // Initialize the time dependent variables
+ void init( double lon, double lat, const string& root,
+ time_t timeOffset, sgTimingOffsetType offsetType );
+
+ // Update the time dependent variables
+ void update( double lon, double lat, double alt_m );
+ void updateLocal( double lon, double lat, const string& root );
+
+ void cal_mjd (int mn, double dy, int yr);
+ void utc_gst();
+ double sidereal_precise (double lng);
+ double sidereal_course(double lng);
+ static SGTime *cur_time_params;
+
+ // Some other stuff which were changed to SGTime members on
+ // questionable grounds -:)
+ // time_t get_start_gmt(int year);
+ time_t get_gmt(int year, int month, int day,
+ int hour, int minute, int second);
+ time_t get_gmt(struct tm* the_time);
+
+ char* format_time( const struct tm* p, char* buf );
+ long int fix_up_timezone( long int timezone_orig );
+
+ inline int get_warp_delta() const { return warp_delta; }
+};
+
+
+inline time_t SGTime::get_gmt(struct tm* the_time) // this is just a wrapper
+{
+ //printf("Using: %24s as input\n", asctime(the_time));
+ return get_gmt(the_time->tm_year,
+ the_time->tm_mon,
+ the_time->tm_mday,
+ the_time->tm_hour,
+ the_time->tm_min,
+ the_time->tm_sec);
+}
+
+
+#endif // _SG_TIME_HXX
projects / simgear.git / commitdiff