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#!/usr/bin/env python3
#
# Copyright (c) 2017 Aaron LI <aly@aaronly.me>
# MIT license
#
"""
Crop out the central region of specified size from the FITS image.
"""
import argparse
from rescale_image import FITSImage
def main():
parser = argparse.ArgumentParser(
description="Rescale a FITS image to the desired size/resolution")
parser.add_argument("-C", "--clobber", action="store_true",
help="overwrite existing output file")
parser.add_argument("-s", "--size", type=float, required=True,
help="central crop box size [deg]")
parser.add_argument("-i", "--infile", required=True,
help="input FITS image")
parser.add_argument("-o", "--outfile", required=True,
help="output cropped FITS image")
args = parser.parse_args()
fitsimage = FITSImage(args.infile)
fitsimage.crop(size=args.size)
fitsimage.write(args.outfile, clobber=args.clobber)
if __name__ == "__main__":
main()
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