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"""
==============
Cropping a Map
==============
How to crop a map by using submap.
"""
import matplotlib.pyplot as plt
import astropy.units as u
from astropy.coordinates import SkyCoord
import sunpy.data.sample
import sunpy.map
###############################################################################
# We start with the sample data
swap_map = sunpy.map.Map(sunpy.data.sample.SWAP_LEVEL1_IMAGE)
##############################################################################
# To crop the data you create a submap, specifying the top right and bottom
# left as SkyCoord objects.
top_right = SkyCoord(0 * u.arcsec, -200 * u.arcsec, frame=swap_map.coordinate_frame)
bottom_left = SkyCoord(-900 * u.arcsec, -900 * u.arcsec, frame=swap_map.coordinate_frame)
swap_submap = swap_map.submap(bottom_left, top_right=top_right)
###############################################################################
# Let's plot the results.
fig = plt.figure()
ax = fig.add_subplot(projection=swap_submap)
image = swap_submap.plot(axes=ax)
swap_submap.draw_limb(axes=ax)
swap_submap.draw_grid(axes=ax)
# Make some room and put the title at the top of the figure
ax.set_position([0.1, 0.1, 0.8, 0.7])
ax.set_title(ax.get_title(), pad=45)
plt.show()
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