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