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Diffstat (limited to 'kstars/kstars/jupitermoons.h')
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diff --git a/kstars/kstars/jupitermoons.h b/kstars/kstars/jupitermoons.h new file mode 100644 index 00000000..23163f26 --- /dev/null +++ b/kstars/kstars/jupitermoons.h @@ -0,0 +1,117 @@ +/*************************************************************************** + jupitermoons.h - description + ------------------- + begin : Fri Oct 18 2002 + copyright : (C) 2002 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 JUPITERMOONS_H +#define JUPITERMOONS_H + +#include "skypoint.h" + +/**@class JupiterMoons + *Implements the four largest moons of Jupiter. + *See Chapter 43 of "Astronomical Algorithms"by Jean Meeus for details + * + *TODO: make the moons SkyObjects, rather than just points. + * + *@author Jason Harris + *@version 1.0 + */ + +class KSPlanet; +class KSSun; + +class JupiterMoons { +public: + /**Constructor. Assign the name of each moon, + *and initialize their XYZ positions to zero. + */ + JupiterMoons(); + + /**Destructor (empty)*/ + ~JupiterMoons(); + + /**Find the positions of each Moon, relative to Jupiter. + *We use an XYZ coordinate system, centered on Jupiter, + *where the X-axis corresponds to Jupiter's Equator, + *the Y-Axis is parallel to Jupiter's Poles, and the + *Z-axis points along the line joining the Earth and + *Jupiter. Once the XYZ positions are known, this + *function also computes the RA,Dec positions of each + *Moon, and sets the inFront bool variable to indicate + *whether the Moon is nearer to us than Jupiter or not + *(this information is used to determine whether the + *Moon should be drawn on top of Jupiter, or vice versa). + * + *See "Astronomical Algorithms" bu Jean Meeus, Chapter 43. + * + *@param num pointer to the KSNumbers object describing + *the date/time at which to find the positions. + *@param jup pointer to the jupiter object + *@param ksun pointer to the Sun object + */ + void findPosition( const KSNumbers *num, const KSPlanet *jup, const KSSun *ksun ); + + /**@return pointer to the stored RA,Dec position of a moon. + *@param id which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto + */ + SkyPoint* pos( int id ) { return &Pos[id]; } + + /**@return TRUE if the Moon is nearer to Earth than Jupiter. + *@param id which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto + */ + bool inFront( int id ) const { return InFront[id]; } + + /**@return the name of a moon. + *@param id which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto + */ + QString name( int id ) const { return Name[id]; } + + /**@return ID number of a moon, given its name: + *0=Io, 1=Europa, 2=Ganymede, 3=Callisto. + *Return -1 if the name does not match one of these. + */ + int moonNamed( const QString &name ) const; + + /**Convert the RA,Dec coordinates of each moon to Az,Alt + *@param LSTh pointer to the current local sidereal time + *@param lat pointer to the geographic latitude + */ + void EquatorialToHorizontal( const dms *LSTh, const dms *lat ); + + /**@return the X-coordinate in the Jupiter-centered coord. system. + *@param i which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto. + */ + double x( int i ) const { return XJ[i]; } + + /**@return the Y-coordinate in the Jupiter-centered coord. system. + *@param i which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto. + */ + double y( int i ) const { return YJ[i]; } + + /**@return the Z-coordinate in the Jupiter-centered coord. system. + *@param i which moon? 0=Io, 1=Europa, 2=Ganymede, 3=Callisto. + */ + double z( int i ) const { return ZJ[i]; } +private: + SkyPoint Pos[4]; + QString Name[4]; + bool InFront[4]; + //the rectangular position, relative to Jupiter. X-axis is equator of Jupiter; usints are Jup. Radius + double XJ[4], YJ[4], ZJ[4]; +}; + +#endif + |