"""
==============
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()