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authorMattias Andrée <maandree@operamail.com>2014-03-05 20:17:43 +0100
committerMattias Andrée <maandree@operamail.com>2014-03-05 20:17:43 +0100
commit90d483317e7528b269d597fc0246ccac5fbb6414 (patch)
treee23eca47369a873ac5259c463a28f0e18c6993d8 /src/plugins/lunar.py
parentupdate todo (diff)
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prototype of lunar
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/plugins/lunar.py')
-rw-r--r--src/plugins/lunar.py65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/plugins/lunar.py b/src/plugins/lunar.py
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+# -*- python -*-
+'''
+xpybar – xmobar replacement written in python
+Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+'''
+
+import math
+import time
+
+
+def julian_day(t):
+ '''
+ Converts a POSIX time timestamp to a Julian Day timestamp
+
+ @param t:float The time in POSIX time
+ @return :float The time in Julian Days
+ '''
+ return t / 86400.0 + 2440587.5
+
+def radians(deg):
+ '''
+ Convert an angle from degrees to radians
+
+ @param deg:float The angle in degrees
+ @return :float The angle in radians
+ '''
+ return deg * math.pi / 180
+
+ref = julian_day(934329600) # 11 August 1999 00:00:00 UTC
+now = julian_day(time.time())
+synodic_month = 29.530588853
+
+fraction = ((now - ref) / synodic_month) % 1
+waxing = fraction <= 0.5 # we get an off by one without equality
+print('fraction: %f' % fraction)
+print('waxing' if waxing else 'waning')
+
+terminator = 90 - 360 * fraction # sunlit trailing
+if terminator < -90:
+ terminator += 180 # visible side
+print('terminator: %f°' % terminator)
+
+hacoversin = lambda deg : 0.5 - math.sin(radians(deg)) / 2
+
+inverted = terminator < 0
+illumination = hacoversin(abs(terminator))
+
+if (not waxing) != inverted:
+ illumination = 1 - illumination
+
+print('illumination: %.2f%%' % (illumination * 100))
+