From 71e9aeeb7f98f96926490af2723e2ebd414632f0 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Sat, 26 Aug 2017 15:41:31 +0800
Subject: sky.py: Allow to set "header"; add "add_history()"

XXX: how to avoid the duplicate @header.setter???
---
 fg21sim/sky.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'fg21sim')

diff --git a/fg21sim/sky.py b/fg21sim/sky.py
index 17ffd62..7fac16d 100644
--- a/fg21sim/sky.py
+++ b/fg21sim/sky.py
@@ -257,6 +257,14 @@ class SkyBase:
                        "File creation date")
         return hdr
 
+    @header.setter
+    def header(self, hdr):
+        """
+        Update the supplied header to the FITS header, but do NOT
+        overwrite the original keywords.
+        """
+        self.header_.extend(hdr, update=False)
+
     def add_header(self, key, value, comment=None):
         """
         Add/update a key to the FITS header.
@@ -266,6 +274,12 @@ class SkyBase:
         else:
             self.header_[key] = (value, comment)
 
+    def add_history(self, history):
+        """
+        Add history to the FITS header.
+        """
+        self.header_.add_history(history)
+
     def copy(self):
         """
         Return a (deep) copy of this instance.
@@ -584,10 +598,19 @@ class SkyPatch(SkyBase):
         """
         hdr = super().header
         hdr.extend(self.wcs.to_header(), update=True)
+        hdr["OBJECT"] = "Sky Patch"
+        hdr["EXTNAME"] = "IMAGE"
         hdr["RA0"] = (self.center[0], "R.A. of patch center [deg]")
         hdr["DEC0"] = (self.center[1], "Dec. of patch center [deg]")
         return hdr
 
+    @header.setter
+    def header(self, hdr):
+        """
+        XXX: How to avoid this duplicate???
+        """
+        self.header_.extend(hdr, update=False)
+
     @property
     def wcs(self):
         """
-- 
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