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import pytest
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
import numpy.testing as npt
from seaborn import rcmod, palettes, utils
def has_verdana():
"""Helper to verify if Verdana font is present"""
# This import is relatively lengthy, so to prevent its import for
# testing other tests in this module not requiring this knowledge,
# import font_manager here
import matplotlib.font_manager as mplfm
try:
verdana_font = mplfm.findfont('Verdana', fallback_to_default=False)
except: # noqa
# if https://github.com/matplotlib/matplotlib/pull/3435
# gets accepted
return False
# otherwise check if not matching the logic for a 'default' one
try:
unlikely_font = mplfm.findfont("very_unlikely_to_exist1234",
fallback_to_default=False)
except: # noqa
# if matched verdana but not unlikely, Verdana must exist
return True
# otherwise -- if they match, must be the same default
return verdana_font != unlikely_font
class RCParamFixtures:
@pytest.fixture(autouse=True)
def reset_params(self):
yield
rcmod.reset_orig()
def flatten_list(self, orig_list):
iter_list = map(np.atleast_1d, orig_list)
flat_list = [item for sublist in iter_list for item in sublist]
return flat_list
def assert_rc_params(self, params):
for k, v in params.items():
# Various subtle issues in matplotlib lead to unexpected
# values for the backend rcParam, which isn't relevant here
if k == "backend":
continue
if isinstance(v, np.ndarray):
npt.assert_array_equal(mpl.rcParams[k], v)
else:
assert mpl.rcParams[k] == v
def assert_rc_params_equal(self, params1, params2):
for key, v1 in params1.items():
# Various subtle issues in matplotlib lead to unexpected
# values for the backend rcParam, which isn't relevant here
if key == "backend":
continue
v2 = params2[key]
if isinstance(v1, np.ndarray):
npt.assert_array_equal(v1, v2)
else:
assert v1 == v2
class TestAxesStyle(RCParamFixtures):
styles = ["white", "dark", "whitegrid", "darkgrid", "ticks"]
def test_default_return(self):
current = rcmod.axes_style()
self.assert_rc_params(current)
def test_key_usage(self):
_style_keys = set(rcmod._style_keys)
for style in self.styles:
assert not set(rcmod.axes_style(style)) ^ _style_keys
def test_bad_style(self):
with pytest.raises(ValueError):
rcmod.axes_style("i_am_not_a_style")
def test_rc_override(self):
rc = {"axes.facecolor": "blue", "foo.notaparam": "bar"}
out = rcmod.axes_style("darkgrid", rc)
assert out["axes.facecolor"] == "blue"
assert "foo.notaparam" not in out
def test_set_style(self):
for style in self.styles:
style_dict = rcmod.axes_style(style)
rcmod.set_style(style)
self.assert_rc_params(style_dict)
def test_style_context_manager(self):
rcmod.set_style("darkgrid")
orig_params = rcmod.axes_style()
context_params = rcmod.axes_style("whitegrid")
with rcmod.axes_style("whitegrid"):
self.assert_rc_params(context_params)
self.assert_rc_params(orig_params)
@rcmod.axes_style("whitegrid")
def func():
self.assert_rc_params(context_params)
func()
self.assert_rc_params(orig_params)
def test_style_context_independence(self):
assert set(rcmod._style_keys) ^ set(rcmod._context_keys)
def test_set_rc(self):
rcmod.set_theme(rc={"lines.linewidth": 4})
assert mpl.rcParams["lines.linewidth"] == 4
rcmod.set_theme()
def test_set_with_palette(self):
rcmod.reset_orig()
rcmod.set_theme(palette="deep")
assert utils.get_color_cycle() == palettes.color_palette("deep", 10)
rcmod.reset_orig()
rcmod.set_theme(palette="deep", color_codes=False)
assert utils.get_color_cycle() == palettes.color_palette("deep", 10)
rcmod.reset_orig()
pal = palettes.color_palette("deep")
rcmod.set_theme(palette=pal)
assert utils.get_color_cycle() == palettes.color_palette("deep", 10)
rcmod.reset_orig()
rcmod.set_theme(palette=pal, color_codes=False)
assert utils.get_color_cycle() == palettes.color_palette("deep", 10)
rcmod.reset_orig()
rcmod.set_theme()
def test_reset_defaults(self):
rcmod.reset_defaults()
self.assert_rc_params(mpl.rcParamsDefault)
rcmod.set_theme()
def test_reset_orig(self):
rcmod.reset_orig()
self.assert_rc_params(mpl.rcParamsOrig)
rcmod.set_theme()
def test_set_is_alias(self):
rcmod.set_theme(context="paper", style="white")
params1 = mpl.rcParams.copy()
rcmod.reset_orig()
rcmod.set_theme(context="paper", style="white")
params2 = mpl.rcParams.copy()
self.assert_rc_params_equal(params1, params2)
rcmod.set_theme()
class TestPlottingContext(RCParamFixtures):
contexts = ["paper", "notebook", "talk", "poster"]
def test_default_return(self):
current = rcmod.plotting_context()
self.assert_rc_params(current)
def test_key_usage(self):
_context_keys = set(rcmod._context_keys)
for context in self.contexts:
missing = set(rcmod.plotting_context(context)) ^ _context_keys
assert not missing
def test_bad_context(self):
with pytest.raises(ValueError):
rcmod.plotting_context("i_am_not_a_context")
def test_font_scale(self):
notebook_ref = rcmod.plotting_context("notebook")
notebook_big = rcmod.plotting_context("notebook", 2)
font_keys = [
"font.size",
"axes.labelsize", "axes.titlesize",
"xtick.labelsize", "ytick.labelsize",
"legend.fontsize", "legend.title_fontsize",
]
for k in font_keys:
assert notebook_ref[k] * 2 == notebook_big[k]
def test_rc_override(self):
key, val = "grid.linewidth", 5
rc = {key: val, "foo": "bar"}
out = rcmod.plotting_context("talk", rc=rc)
assert out[key] == val
assert "foo" not in out
def test_set_context(self):
for context in self.contexts:
context_dict = rcmod.plotting_context(context)
rcmod.set_context(context)
self.assert_rc_params(context_dict)
def test_context_context_manager(self):
rcmod.set_context("notebook")
orig_params = rcmod.plotting_context()
context_params = rcmod.plotting_context("paper")
with rcmod.plotting_context("paper"):
self.assert_rc_params(context_params)
self.assert_rc_params(orig_params)
@rcmod.plotting_context("paper")
def func():
self.assert_rc_params(context_params)
func()
self.assert_rc_params(orig_params)
class TestPalette(RCParamFixtures):
def test_set_palette(self):
rcmod.set_palette("deep")
assert utils.get_color_cycle() == palettes.color_palette("deep", 10)
rcmod.set_palette("pastel6")
assert utils.get_color_cycle() == palettes.color_palette("pastel6", 6)
rcmod.set_palette("dark", 4)
assert utils.get_color_cycle() == palettes.color_palette("dark", 4)
rcmod.set_palette("Set2", color_codes=True)
assert utils.get_color_cycle() == palettes.color_palette("Set2", 8)
assert mpl.colors.same_color(
mpl.rcParams["patch.facecolor"], palettes.color_palette()[0]
)
class TestFonts(RCParamFixtures):
_no_verdana = not has_verdana()
@pytest.mark.skipif(_no_verdana, reason="Verdana font is not present")
def test_set_font(self):
rcmod.set_theme(font="Verdana")
_, ax = plt.subplots()
ax.set_xlabel("foo")
assert ax.xaxis.label.get_fontname() == "Verdana"
rcmod.set_theme()
def test_set_serif_font(self):
rcmod.set_theme(font="serif")
_, ax = plt.subplots()
ax.set_xlabel("foo")
assert ax.xaxis.label.get_fontname() in mpl.rcParams["font.serif"]
rcmod.set_theme()
@pytest.mark.skipif(_no_verdana, reason="Verdana font is not present")
def test_different_sans_serif(self):
rcmod.set_theme()
rcmod.set_style(rc={"font.sans-serif": ["Verdana"]})
_, ax = plt.subplots()
ax.set_xlabel("foo")
assert ax.xaxis.label.get_fontname() == "Verdana"
rcmod.set_theme()
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