From 66ee073f818254c9d976f9c71b568dafc157f9e0 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Sat, 8 Dec 2018 21:50:48 +0800
Subject: astro/fitsimage.py: Add sub-command "d2f" (double to float)

---
 astro/fitsimage.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/astro/fitsimage.py b/astro/fitsimage.py
index 620373b..61be6da 100755
--- a/astro/fitsimage.py
+++ b/astro/fitsimage.py
@@ -386,6 +386,18 @@ def cmd_shift(args):
     print("Saved shifted FITS image to: %s" % args.outfile)
 
 
+def cmd_d2f(args):
+    """
+    Sub-command: "d2f", convert data type from double to float(32).
+    """
+    fimage = FITSImage(args.infile)
+    print("Data type: %s" % fimage.data.dtype)
+    print("Converting to float(32) ...")
+    fimage.data = fimage.data.astype(np.float32)
+    fimage.write(args.outfile, clobber=args.clobber)
+    print("Saved FITS image to: %s" % args.outfile)
+
+
 def main():
     parser = argparse.ArgumentParser(
         description="FITS image manipulation tool")
@@ -552,6 +564,18 @@ def main():
                             help="numer of vertical pixels")
     parser_sft.set_defaults(func=cmd_shift)
 
+    # sub-command: "d2f"
+    parser_d2f = subparsers.add_parser(
+        "d2f",
+        help="convert data type from double to float(32)")
+    parser_d2f.add_argument("-C", "--clobber", action="store_true",
+                            help="overwrite existing output file")
+    parser_d2f.add_argument("-i", "--infile", required=True,
+                            help="input FITS image")
+    parser_d2f.add_argument("-o", "--outfile", required=True,
+                            help="output converted FITS image")
+    parser_d2f.set_defaults(func=cmd_d2f)
+
     args = parser.parse_args()
     args.func(args)
 
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