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"""
==============
Rotating a Map
==============
How to rotate a map.
"""
import matplotlib.pyplot as plt
import astropy.units as u
import sunpy.data.sample
import sunpy.map
###############################################################################
# We start with the sample data.
aia_map = sunpy.map.Map(sunpy.data.sample.AIA_171_IMAGE)
##############################################################################
# `~sunpy.map.GenericMap` provides the :meth:`~sunpy.map.GenericMap.rotate`
# method which accepts an angle. This returns a rotated map and does not
# modify the original map. The data array size is expanded so that none of the
# original data is lost due to cropping.
aia_rotated = aia_map.rotate(angle=30 * u.deg)
###############################################################################
# Let's now plot the results.
plt.figure()
aia_rotated.plot(clip_interval=(1, 99.99)*u.percent)
aia_rotated.draw_limb()
aia_rotated.draw_grid()
plt.show()
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