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"""
Nightshade feature
------------------
Draws a polygon where there is no sunlight for the given datetime.
"""
__tags__ = ['Lines and polygons']
import datetime
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
from cartopy.feature.nightshade import Nightshade
fig = plt.figure(figsize=(10, 5))
ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree())
date = datetime.datetime(1999, 12, 31, 12)
ax.set_title('Night time shading for {}'.format(date))
ax.stock_img()
ax.add_feature(Nightshade(date, alpha=0.2))
plt.show()
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