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# (C) British Crown Copyright 2018, Met Office
#
# This file is part of cartopy.
#
# cartopy is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cartopy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with cartopy. If not, see <https://www.gnu.org/licenses/>.
"""
Tests for the InterruptedGoodeHomolosine coordinate system.
"""
from __future__ import (absolute_import, division, print_function)
import numpy as np
from numpy.testing import assert_almost_equal
import pytest
import cartopy.crs as ccrs
from .helpers import check_proj_params
def test_default():
igh = ccrs.InterruptedGoodeHomolosine()
other_args = {'ellps=WGS84', 'lon_0=0'}
check_proj_params('igh', igh, other_args)
assert_almost_equal(np.array(igh.x_limits),
[-20037508.3427892, 20037508.3427892])
assert_almost_equal(np.array(igh.y_limits),
[-8683259.7164347, 8683259.7164347])
def test_eccentric_globe():
globe = ccrs.Globe(semimajor_axis=1000, semiminor_axis=500,
ellipse=None)
igh = ccrs.InterruptedGoodeHomolosine(globe=globe)
other_args = {'a=1000', 'b=500', 'lon_0=0'}
check_proj_params('igh', igh, other_args)
assert_almost_equal(np.array(igh.x_limits),
[-3141.5926536, 3141.5926536])
assert_almost_equal(np.array(igh.y_limits),
[-1361.410035, 1361.410035])
@pytest.mark.parametrize('lon', [-10.0, 10.0])
def test_central_longitude(lon):
igh = ccrs.InterruptedGoodeHomolosine(central_longitude=lon)
other_args = {'ellps=WGS84', 'lon_0={}'.format(lon)}
check_proj_params('igh', igh, other_args)
assert_almost_equal(np.array(igh.x_limits),
[-20037508.3427892, 20037508.3427892],
decimal=5)
assert_almost_equal(np.array(igh.y_limits),
[-8683259.7164347, 8683259.7164347])
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