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# (C) British Crown Copyright 2011 - 2019, 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/>.
from __future__ import (absolute_import, division, print_function)
import math
import matplotlib.pyplot as plt
import matplotlib.ticker
import pytest
import cartopy.crs as ccrs
from cartopy.tests.mpl import MPL_VERSION, ImageTesting
def _format_lat(val, i):
if val > 0:
return '%.0fN' % val
elif val < 0:
return '%.0fS' % abs(val)
else:
return '0'
def _format_lon(val, i):
# Apply periodic boundary conditions, with an almost equal test on 180 lon.
while val > 180:
val -= 360
while val < -180:
val += 360
if abs(abs(val) - 180.) <= 1e-06 or val == 0:
return '%.0f' % abs(val)
elif val > 0:
return '%.0fE' % val
elif val < 0:
return '%.0fW' % abs(val)
# Text tends to move a lot. Also, pre-2.0.1, the new center_baseline alignment
# did not exist.
if MPL_VERSION < '2.0.0':
ticks_tolerance = 6.3
elif '2.0.0' <= MPL_VERSION < '2.0.1':
ticks_tolerance = 9
else:
ticks_tolerance = 7
@pytest.mark.natural_earth
@ImageTesting(['xticks_no_transform'],
tolerance=ticks_tolerance)
def test_set_xticks_no_transform():
ax = plt.axes(projection=ccrs.PlateCarree())
ax.coastlines('110m')
ax.xaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lon))
ax.yaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lat))
ax.set_xticks([-180, -90, 0, 90, 180])
ax.set_xticks([-135, -45, 45, 135], minor=True)
@pytest.mark.natural_earth
@ImageTesting(['xticks_cylindrical'],
tolerance=ticks_tolerance)
def test_set_xticks_cylindrical():
ax = plt.axes(projection=ccrs.Mercator(
min_latitude=-85.,
max_latitude=85.,
globe=ccrs.Globe(semimajor_axis=math.degrees(1))))
ax.coastlines('110m')
ax.xaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lon))
ax.yaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lat))
ax.set_xticks([-180, -90, 0, 90, 180], crs=ccrs.PlateCarree())
ax.set_xticks([-135, -45, 45, 135], minor=True, crs=ccrs.PlateCarree())
def test_set_xticks_non_cylindrical():
ax = plt.axes(projection=ccrs.Orthographic())
with pytest.raises(RuntimeError):
ax.set_xticks([-180, -90, 0, 90, 180], crs=ccrs.Geodetic())
with pytest.raises(RuntimeError):
ax.set_xticks([-135, -45, 45, 135], minor=True, crs=ccrs.Geodetic())
plt.close()
@pytest.mark.natural_earth
@ImageTesting(['yticks_no_transform'],
tolerance=ticks_tolerance)
def test_set_yticks_no_transform():
ax = plt.axes(projection=ccrs.PlateCarree())
ax.coastlines('110m')
ax.xaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lon))
ax.yaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lat))
ax.set_yticks([-60, -30, 0, 30, 60])
ax.set_yticks([-75, -45, 15, 45, 75], minor=True)
@pytest.mark.natural_earth
@ImageTesting(['yticks_cylindrical'],
tolerance=ticks_tolerance)
def test_set_yticks_cylindrical():
ax = plt.axes(projection=ccrs.Mercator(
min_latitude=-85.,
max_latitude=85.,
globe=ccrs.Globe(semimajor_axis=math.degrees(1))))
ax.coastlines('110m')
ax.xaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lon))
ax.yaxis.set_major_formatter(matplotlib.ticker.FuncFormatter(_format_lat))
ax.set_yticks([-60, -30, 0, 30, 60], crs=ccrs.PlateCarree())
ax.set_yticks([-75, -45, 15, 45, 75], minor=True, crs=ccrs.PlateCarree())
def test_set_yticks_non_cylindrical():
ax = plt.axes(projection=ccrs.Orthographic())
with pytest.raises(RuntimeError):
ax.set_yticks([-60, -30, 0, 30, 60], crs=ccrs.Geodetic())
with pytest.raises(RuntimeError):
ax.set_yticks([-75, -45, 15, 45, 75], minor=True, crs=ccrs.Geodetic())
plt.close()
@pytest.mark.natural_earth
@ImageTesting(['xyticks'], tolerance=ticks_tolerance)
def test_set_xyticks():
fig = plt.figure(figsize=(10, 10))
projections = (ccrs.PlateCarree(),
ccrs.Mercator(globe=ccrs.Globe(
semimajor_axis=math.degrees(1))),
ccrs.TransverseMercator(approx=False))
x = -3.275024
y = 50.753998
for i, prj in enumerate(projections, 1):
ax = fig.add_subplot(3, 1, i, projection=prj)
ax.set_extent([-12.5, 4, 49, 60], ccrs.Geodetic())
ax.coastlines('110m')
p, q = prj.transform_point(x, y, ccrs.Geodetic())
ax.set_xticks([p])
ax.set_yticks([q])
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