deg2str.py

from numpy import sign

def deg2str(degrees,sp=':',ra=1,dec=0,prec=2):
    """Convert decimal degress to sexagecimal expression.
     Inseok Song (2007)
     >>> deg2str(123.4567)
     Out: '08:13:49.61'
     >>> deg2str(123.4567,prec=3)
     Out: '08:13:49.608'
     >>> deg2str(123.4567,prec=3,sp=' ')
     Out: '08 13 49.608'
     >>> deg2str(-23.4567,dec=1)
     Out: '-23:27.24.12'
     ...
    """
    if (ra & ~dec):
        if ( (degrees < 0.0) or (degrees > 360.0) ):
            retstr = ' 0>RA<360 '
            return(retstr)
        
        formatstr = '%02d%s%02d%s%0'+'%1d.%1df' % (prec+3,prec)
        degrees = degrees/15.0
        rah = int(degrees)
        ram = int((degrees-rah)*60.0)
        ras = ((degrees - rah)*60 - ram)*60.0
        retstr = formatstr % (rah,sp,ram,sp,ras)
    elif (dec):
        if (degrees >= 0): 
            mysign='+'
        else:
            mysign='-'
        if (abs(degrees) > 90):
            retstr = ' |DEC|>90'
            return(retstr)
        formatstr = '%c%02.2d%s%02d%s%0'+'%1d.%1df' % (prec+3,prec)
        degrees = abs(degrees)
        ded = int(degrees)
        dem = int((degrees-ded)*60.0)
        des = ((degrees - ded)*60 - dem)*60.0
        retstr = formatstr % (mysign,ded,sp,dem,sp,des)
    return retstr