* September 1998. This code is based upon algorithms and data kindly
* provided by Mr. Paul Schlyter. (pausch@saaf.se).
*
- * 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 library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * This library 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.
+ * Library 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.
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
*
* $Id$
**************************************************************************/
#include <simgear/constants.h>
-#include <simgear/timing/sg_time.hxx>
class Star;
double magnitude;
double lonEcl, latEcl;
- double fgCalcEccAnom(double M, double e);
- double fgCalcActTime(SGTime *t);
- void updateOrbElements(SGTime *t);
+ double sgCalcEccAnom(double M, double e);
+ double sgCalcActTime(double mjd);
+ void updateOrbElements(double mjd);
public:
CelestialBody(double Nf, double Ns,
double wf, double ws,
double af, double as,
double ef, double es,
- double Mf, double Ms, SGTime *t);
+ double Mf, double Ms, double mjd);
CelestialBody(double Nf, double Ns,
double If, double Is,
double wf, double ws,
double getMagnitude();
double getLon();
double getLat();
- void updatePosition(SGTime *t, Star *ourSun);
+ void updatePosition(double mjd, Star *ourSun);
};
-/*****************************************************************************
- * inline CelestialBody::CelestialBody
- * public constructor for a generic celestialBody object.
- * initializes the 6 primary orbital elements. The elements are:
- * N: longitude of the ascending node
- * i: inclination to the ecliptic
- * w: argument of perihelion
- * a: semi-major axis, or mean distance from the sun
- * e: eccenticity
- * M: mean anomaly
- * Each orbital element consists of a constant part and a variable part that
- * gradually changes over time.
- *
- * Argumetns:
- * the 13 arguments to the constructor constitute the first, constant
- * ([NiwaeM]f) and the second variable ([NiwaeM]s) part of the orbital
- * elements. The 13th argument is the current time. Note that the inclination
- * is written with a capital (If, Is), because 'if' is a reserved word in the
- * C/C++ programming language.
- ***************************************************************************/
-inline CelestialBody::CelestialBody(double Nf, double Ns,
- double If, double Is,
- double wf, double ws,
- double af, double as,
- double ef, double es,
- double Mf, double Ms, SGTime *t)
-{
- NFirst = Nf; NSec = Ns;
- iFirst = If; iSec = Is;
- wFirst = wf; wSec = ws;
- aFirst = af; aSec = as;
- eFirst = ef; eSec = es;
- MFirst = Mf; MSec = Ms;
- updateOrbElements(t);
-};
-
-inline CelestialBody::CelestialBody(double Nf, double Ns,
- double If, double Is,
- double wf, double ws,
- double af, double as,
- double ef, double es,
- double Mf, double Ms)
-{
- NFirst = Nf; NSec = Ns;
- iFirst = If; iSec = Is;
- wFirst = wf; wSec = ws;
- aFirst = af; aSec = as;
- eFirst = ef; eSec = es;
- MFirst = Mf; MSec = Ms;
-};
-
-/****************************************************************************
- * inline void CelestialBody::updateOrbElements(SGTime *t)
- * given the current time, this private member calculates the actual
- * orbital elements
- *
- * Arguments: SGTime *t: the current time:
- *
- * return value: none
- ***************************************************************************/
-inline void CelestialBody::updateOrbElements(SGTime *t)
-{
- double actTime = fgCalcActTime(t);
- M = DEG_TO_RAD * (MFirst + (MSec * actTime));
- w = DEG_TO_RAD * (wFirst + (wSec * actTime));
- N = DEG_TO_RAD * (NFirst + (NSec * actTime));
- i = DEG_TO_RAD * (iFirst + (iSec * actTime));
- e = eFirst + (eSec * actTime);
- a = aFirst + (aSec * actTime);
-}
-/*****************************************************************************
- * 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).
- *
- * Argument: the current time
- *
- * return value: the (fractional) number of days until Jan 1, 2000.
- ****************************************************************************/
-inline double CelestialBody::fgCalcActTime(SGTime *t)
-{
- return (t->getMjd() - 36523.5);
-}
-
-/*****************************************************************************
- * inline void CelestialBody::getPos(double* ra, double* dec)
- * gives public access to Right Ascension and declination
- *
- ****************************************************************************/
-inline void CelestialBody::getPos(double* ra, double* dec)
-{
- *ra = rightAscension;
- *dec = declination;
-}
-
-/*****************************************************************************
- * inline void CelestialBody::getPos(double* ra, double* dec, double* magnitude
- * gives public acces to the current Right ascension, declination, and
- * magnitude
- ****************************************************************************/
-inline void CelestialBody::getPos(double* ra, double* dec, double* magn)
-{
- *ra = rightAscension;
- *dec = declination;
- *magn = magnitude;
-}
-
inline double CelestialBody::getRightAscension() { return rightAscension; }
inline double CelestialBody::getDeclination() { return declination; }
inline double CelestialBody::getMagnitude() { return magnitude; }
#endif // _CELESTIALBODY_H_
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projects / simgear.git / blobdiff