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Diffstat (limited to 'kstars/kstars/ksmoon.h')
| -rw-r--r-- | kstars/kstars/ksmoon.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/kstars/kstars/ksmoon.h b/kstars/kstars/ksmoon.h new file mode 100644 index 00000000..80f65c3e --- /dev/null +++ b/kstars/kstars/ksmoon.h @@ -0,0 +1,133 @@ +/*************************************************************************** + ksmoon.h - K Desktop Planetarium + ------------------- + begin : Sun Aug 26 2001 + copyright : (C) 2001 by Jason Harris + email : kstars@30doradus.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. * + * * + ***************************************************************************/ + +#ifndef KSMOON_H +#define KSMOON_H + +#include "ksplanetbase.h" +#include "dms.h" + +/**@class KSMoon + *A subclass of SkyObject that provides information + *needed for the Moon. Specifically, KSMoon provides a moon-specific + *findPosition() function. Also, there is a method findPhase(), which returns + *the lunar phase as a floating-point number between 0.0 and 1.0. + *@short Provides necessary information about the Moon. + *@author Jason Harris + *@version 1.0 + */ + +class KStarsData; +class KSSun; + +class KSMoon : public KSPlanetBase { +public: + /** + *Default constructor. Set name="Moon". + */ + KSMoon(KStarsData *kd); + + /**Destructor (empty). */ + ~KSMoon(); + + /** + *Determine the phase angle of the moon, and assign the appropriate + *moon image + *@param Sun The current Sun object. + */ + void findPhase( const KSSun *Sun ); + + /**@return the moon's current phase angle, as a dms angle + */ + dms phase( void ) const { return Phase; } + + /**@return the illuminated fraction of the Moon as seen from Earth + */ + double illum( void ) const { return 0.5*(1.0 - cos( phase().radians() ) ); } + + /**@return a short string describing the moon's phase + */ + QString phaseName( void ) const; + + /** reimplemented from KSPlanetBase + */ + virtual bool loadData(); + +protected: + /**Reimplemented from KSPlanetBase, this function employs unique algorithms for + *estimating the lunar coordinates. Finding the position of the moon is + *much more difficult than the other planets. For one thing, the Moon is + *a lot closer, so we can detect smaller deviations in its orbit. Also, + *the Earth has a significant effect on the Moon's orbit, and their + *interaction is complex and nonlinear. As a result, the positions as + *calculated by findPosition() are only accurate to about 10 arcseconds + *(10 times less precise than the planets' positions!) + *@short moon-specific coordinate finder + *@param num KSNumbers pointer for the target date/time + *@note we don't use the Earth pointer here + */ + virtual bool findGeocentricPosition( const KSNumbers *num, const KSPlanetBase* ); + +private: + dms Phase; + static bool data_loaded; + +/**@class MoonLRData + *Encapsulates the Longitude and radius terms of the sums + *used to compute the moon's position. + *@short Moon Longitude and radius data object + *@author Mark Hollomon + *@version 1.0 + */ + class MoonLRData { + public: + int nd; + int nm; + int nm1; + int nf; + double Li; + double Ri; + + MoonLRData( int pnd, int pnm, int pnm1, int pnf, double pLi, double pRi ): + nd(pnd), nm(pnm), nm1(pnm1), nf(pnf), Li(pLi), Ri(pRi) {} + }; + + static QPtrList<MoonLRData> LRData; + +/**@class MoonBData + *Encapsulates the Latitude terms of the sums + *used to compute the moon's position. + *@short Moon Latitude data object + *@author Mark Hollomon + *@version 1.0 + */ + class MoonBData { + public: + int nd; + int nm; + int nm1; + int nf; + double Bi; + + MoonBData( int pnd, int pnm, int pnm1, int pnf, double pBi ): + nd(pnd), nm(pnm), nm1(pnm1), nf(pnf), Bi(pBi) {} + }; + + static QPtrList<MoonBData> BData; +}; + +#endif |