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134 lines
4.0 KiB
134 lines
4.0 KiB
/***************************************************************************
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ksmoon.h - Trinity Desktop Planetarium
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-------------------
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begin : Sun Aug 26 2001
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copyright : (C) 2001 by Jason Harris
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email : kstars@30doradus.org
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef KSMOON_H
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#define KSMOON_H
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#include "ksplanetbase.h"
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#include "dms.h"
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/**@class KSMoon
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*A subclass of SkyObject that provides information
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*needed for the Moon. Specifically, KSMoon provides a moon-specific
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*findPosition() function. Also, there is a method findPhase(), which returns
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*the lunar phase as a floating-point number between 0.0 and 1.0.
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*@short Provides necessary information about the Moon.
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*@author Jason Harris
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*@version 1.0
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*/
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class KStarsData;
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class KSSun;
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class KSMoon : public KSPlanetBase {
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public:
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/**
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*Default constructor. Set name="Moon".
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*/
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KSMoon(KStarsData *kd);
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/**Destructor (empty). */
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~KSMoon();
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/**
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*Determine the phase angle of the moon, and assign the appropriate
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*moon image
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*@param Sun The current Sun object.
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*/
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void findPhase( const KSSun *Sun );
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/**@return the moon's current phase angle, as a dms angle
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*/
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dms phase( void ) const { return Phase; }
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/**@return the illuminated fraction of the Moon as seen from Earth
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*/
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double illum( void ) const { return 0.5*(1.0 - cos( phase().radians() ) ); }
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/**@return a short string describing the moon's phase
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*/
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TQString phaseName( void ) const;
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/** reimplemented from KSPlanetBase
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*/
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virtual bool loadData();
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protected:
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/**Reimplemented from KSPlanetBase, this function employs unique algorithms for
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*estimating the lunar coordinates. Finding the position of the moon is
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*much more difficult than the other planets. For one thing, the Moon is
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*a lot closer, so we can detect smaller deviations in its orbit. Also,
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*the Earth has a significant effect on the Moon's orbit, and their
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*interaction is complex and nonlinear. As a result, the positions as
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*calculated by findPosition() are only accurate to about 10 arcseconds
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*(10 times less precise than the planets' positions!)
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*@short moon-specific coordinate finder
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*@param num KSNumbers pointer for the target date/time
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*@note we don't use the Earth pointer here
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*/
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virtual bool findGeocentricPosition( const KSNumbers *num, const KSPlanetBase* );
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private:
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dms Phase;
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static bool data_loaded;
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/**@class MoonLRData
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*Encapsulates the Longitude and radius terms of the sums
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*used to compute the moon's position.
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*@short Moon Longitude and radius data object
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*@author Mark Hollomon
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*@version 1.0
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*/
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class MoonLRData {
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public:
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int nd;
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int nm;
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int nm1;
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int nf;
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double Li;
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double Ri;
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MoonLRData( int pnd, int pnm, int pnm1, int pnf, double pLi, double pRi ):
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nd(pnd), nm(pnm), nm1(pnm1), nf(pnf), Li(pLi), Ri(pRi) {}
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};
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static TQPtrList<MoonLRData> LRData;
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/**@class MoonBData
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*Encapsulates the Latitude terms of the sums
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*used to compute the moon's position.
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*@short Moon Latitude data object
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*@author Mark Hollomon
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*@version 1.0
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*/
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class MoonBData {
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public:
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int nd;
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int nm;
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int nm1;
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int nf;
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double Bi;
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MoonBData( int pnd, int pnm, int pnm1, int pnf, double pBi ):
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nd(pnd), nm(pnm), nm1(pnm1), nf(pnf), Bi(pBi) {}
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};
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static TQPtrList<MoonBData> BData;
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};
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#endif
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