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;
	}
	}