convert_coordinates.cpp
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convert_coordinates.cpp
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			#include <iostream>
			#include <cstring>
			#include <string.h>
			#include <sstream>
			#include <stdlib.h>
			#include <stdio.h>
			#include <fstream>
			#include <cmath>
			#include "convert_coordinates.hpp"
			#include <iomanip>

			/* Convert relative coordinate to absolute coordinates
			*/
			void convertXY_to_abs( double x, double y, int iref, double ref_ra, double ref_dec )
			{
			double DTR=acos(-1.)/180.;
			// Convert the input values to absolute WCS coordinates
			if ( iref == 1 \|\| iref == 3 )
			{
			x /= -3600.cos(ref_dec * DTR);
			*x += ref_ra;
			*y /= 3600.;
			*y += ref_dec;
			}
			else if ( iref == 2 ) // image coordinates
			{
			*x += ref_ra;
			*y += ref_dec;
			}
			}

			/* Convert absolute coordinate to relative coordinates
			*/
			void convertXY_to_rela( double x, double y, int iref, double ref_ra, double ref_dec )
			{
			double DTR=acos(-1.)/180.;
			// convert to output relative coordinates
			if ( iref == 1 \|\| iref == 3 )
			{
			*x -= ref_ra;
			x = -3600 * cos(ref_dec * DTR);
			*y -= ref_dec;
			y = 3600;
			}
			else if ( iref == 2 )
			{
			*x -= ref_ra;
			*y -= ref_dec;
			}
			}