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Дата изменения: Fri Sep 11 17:33:25 1998 Дата индексирования: Tue Oct 2 12:45:50 2012 Кодировка: Поисковые слова: universe |
#include "WorldCoords.h" class WorldCoords { ... public: WorldCoords(); WorldCoords(const HMS& ra, const HMS& dec, double equinox = 2000.0); WorldCoords(double ra_deg, double dec_deg, double equinox = 2000.0); WorldCoords(int rh, int rm, double rs, int dd, int dm, float ds, double equinox = 2000.0); WorldCoords(const char* ra_str, const char* dec_str, double equinox = 2000.0); isNull() const; void setNull(); void print(char* ra_buf, char* dec_buf, double equinox = 2000.0); friend istream& operator>>(istream&, WorldCoords& pos); friend ostream& operator<<(ostream&, const WorldCoords& pos); friend int operator==(const WorldCoords& a, const WorldCoords& b); friend int operator!=(const WorldCoords& a, const WorldCoords& b); friend WorldCoords operator-(const WorldCoords& a, const WorldCoords& b); const HMS& ra() const; const HMS& dec() const; int status(); };
This class is used to represent world coordinates and to convert between different representations of world coordinates. The member variables in the class are always kept internally in both H:M:S format and as floating point values in the default equinox J2000. For example, for a given WorldCoords object "pos", the coordinates in H:M:S[+-]D:M:S format are given by: (pos.ra(), pos.dec()) ra() and dec() both return a reference to an HMS object, which is used to represent values in hours, minutes and seconds (see HMS). The coordinates in decimal degrees are given by (pos.ra().val()*15, pos.dec().val()). The ra value must be multiplied by 15 to convert from hours to degrees.
WorldCoords() Initialize null world coordinates. (Null coordinates are useful in some cases where you have an optional second position for an area instead of a single point). WorldCoords(ra, dec, equinox) Initialize the world coordinates from RA, DEC in H:M:S D:M:S format. Arguments: ra (in) - RA in H:M:S dec (in) - DEC in D:M:S equinox (in) - optional epoch (2000.0, 1950.0, ...) WorldCoords(rh, rm, rs, dd, dm, ds, equinox) Initialize the world coordinates from H M S D M S as separate values. Arguments: rh (in) - RA hours rm (in) - RA minutes rs (in) - RA seconds dd (in) - DEC degrees dm (in) - DEC minutes ds (in) - DEC seconds equinox (in) - optional epoch (2000.0, 1950.0, ...) WorldCoords(ra_deg, dec_deg, equinox) Initialize the world coordinates from RA, DEC in degrees in floating point format. Arguments: ra (in) - right ascension dec (in) - declination equinox (in) - epoch (2000.0, 1950.0, ...) WorldCoords(ra_str, dec_str, equinox); Initialize the world coordinates from RA and DEC in string format. Allowed formats of input strings: hh mm ss.s +/-dd mm ss.s hh:mm:ss.s +/-dd:mm:ss.s h.hhhh +/-d.dddd Arguments: ra (in) - String containing right ascension dec (in) - String containing declination equinox (in) - epoch (2000.0, 1950.0, ...)
isNull() Return true if the given coords are null (this is true if they were created with the default constructor - i.e.: with no arguments). setNull() Set to the null value. print(ra_buf, dec_buf, equinox) Print the coordinates in the given buffers in H:M:S format in given equinox. operator>>(istream, pos) Input operator: format: H:M:S[+-]D:M:S - reads the position from the given istream. operator<<(ostream, pos) Output operator: format: H:M:S[+-]D:M:S - writes the position to the given ostream. operator==(pos1, pos2) operator!=(pos1, pos2) Comparison operators - check for equality/inequality. ra() Return the RA part of the coordinates (class HMS). ra().val()*15 is the value in degrees, ra.hours(), ra().min() and ra().sec() give the H:M:S values. dec() Return the DEC part of the coordinates (class HMS). dec().val() is the value in degrees, dec.hours(), dec().min() and dec().sec() give the H:M:S values. status() Return the status after the constructor is done (0 is OK, 1 for errors).
- - - - - - Last change: 08 Sep 98
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