# -*- python -*- # This example can be used in xmobar to display the # Sun's elevation and to what degree it is day time. # Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) # # Permission is granted to copy, distribute and/or modify this document # under the terms of the GNU Free Documentation License, Version 1.3 # or any later version published by the Free Software Foundation; # with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. # You should have received a copy of the GNU General Public License # along with this software package. If not, see <http://www.gnu.org/licenses/>. # Geographical coodinates. # (KTH building D computer laboratories in this example.) latitude, longitude = 59.3472, 18.0728 # The colour temperature at day and at night. temperature_day, temperature_night = 6500, 3700 # Get current time. now = epoch() now_m = now - 1 now_p = now + 1 now_d = now_p - now_m now = epoch_to_julian_centuries(now) now_m = epoch_to_julian_centuries(now_m) now_p = epoch_to_julian_centuries(now_p) # The visibility of the Sun. dayness = sun(latitude, longitude, now) dayness_m = sun(latitude, longitude, now_m) dayness_p = sun(latitude, longitude, now_p) dayness_d = (dayness_p - dayness_m) / now_d # The Sun's elevation. elevation = solar_elevation(latitude, longitude, now) elevation_m = solar_elevation(latitude, longitude, now_m) elevation_p = solar_elevation(latitude, longitude, now_p) elevation_d = (elevation_p - elevation_m) / now_d # Calculation of the colour temperature. temperature = temperature_day * dayness + temperature_night * (1 - dayness) temperature_m = temperature_day * dayness_m + temperature_night * (1 - dayness_m) temperature_p = temperature_day * dayness_p + temperature_night * (1 - dayness_p) temperature_d = (temperature_p - temperature_m) / now_d # Calculate the whitepoint with adjusted colour temperature. whitepoint = divide_by_maximum(cmf_10deg(temperature)) whitepoint = [('0' + hex(int(c * 255 + 0.5))[2:].upper())[-2:] for c in whitepoint] whitepoint = whitepoint[0] + whitepoint[1] + whitepoint[2] # Convert derivative to per minutes from per seconds. temperature_d *= 60 elevation_d *= 60 dayness_d *= 60 # Print information. dayness *= 100 dayness_d *= 100 output = '<fc=#%s>%0.f</fc>K %.1fK/min %.1f° %.2f°/min %.0f%% %.1f%%/min' output %= (whitepoint, temperature, temperature_d, elevation, elevation_d, dayness, dayness_d) print(output)