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# Copyright Cartopy Contributors
#
# This file is part of Cartopy and is released under the LGPL license.
# See COPYING and COPYING.LESSER in the root of the repository for full
# licensing details.
"""
Tests for the InterruptedGoodeHomolosine coordinate system.
"""
import numpy as np
from numpy.testing import assert_allclose
import pytest
import cartopy.crs as ccrs
from .helpers import check_proj_params
@pytest.mark.parametrize("emphasis", ["land", "ocean"])
def test_default(emphasis):
igh = ccrs.InterruptedGoodeHomolosine(emphasis=emphasis)
other_args = {"ellps=WGS84", "lon_0=0"}
if emphasis == "land":
check_proj_params("igh", igh, other_args)
elif emphasis == "ocean":
check_proj_params("igh_o", igh, other_args)
assert_allclose(
np.array(igh.x_limits), [-20037508.3427892, 20037508.3427892]
)
assert_allclose(
np.array(igh.y_limits), [-8683259.7164347, 8683259.7164347]
)
@pytest.mark.parametrize("emphasis", ["land", "ocean"])
def test_eccentric_globe(emphasis):
globe = ccrs.Globe(semimajor_axis=1000, semiminor_axis=500, ellipse=None)
igh = ccrs.InterruptedGoodeHomolosine(globe=globe, emphasis=emphasis)
other_args = {"a=1000", "b=500", "lon_0=0"}
if emphasis == "land":
check_proj_params("igh", igh, other_args)
elif emphasis == "ocean":
check_proj_params("igh_o", igh, other_args)
assert_allclose(np.array(igh.x_limits), [-3141.5926536, 3141.5926536])
assert_allclose(np.array(igh.y_limits), [-1361.410035, 1361.410035])
@pytest.mark.parametrize(
("emphasis", "lon"),
[("land", -10.0), ("land", 10.0), ("ocean", -10.0), ("ocean", 10.0)],
)
def test_central_longitude(emphasis, lon):
igh = ccrs.InterruptedGoodeHomolosine(
central_longitude=lon, emphasis=emphasis
)
other_args = {"ellps=WGS84", f"lon_0={lon}"}
if emphasis == "land":
check_proj_params("igh", igh, other_args)
elif emphasis == "ocean":
check_proj_params("igh_o", igh, other_args)
assert_allclose(
np.array(igh.x_limits),
[-20037508.3427892, 20037508.3427892],
)
assert_allclose(
np.array(igh.y_limits), [-8683259.7164347, 8683259.7164347]
)
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