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test_ticker.py
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475 lines (409 loc) · 16.4 KB
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from __future__ import (absolute_import, division, print_function,
unicode_literals)
import six
import nose.tools
from nose.tools import assert_equal, assert_raises
from numpy.testing import assert_almost_equal
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.ticker as mticker
from matplotlib.testing.decorators import cleanup
import warnings
def test_MaxNLocator():
loc = mticker.MaxNLocator(nbins=5)
test_value = np.array([20., 40., 60., 80., 100.])
assert_almost_equal(loc.tick_values(20, 100), test_value)
test_value = np.array([0., 0.0002, 0.0004, 0.0006, 0.0008, 0.001])
assert_almost_equal(loc.tick_values(0.001, 0.0001), test_value)
test_value = np.array([-1.0e+15, -5.0e+14, 0e+00, 5e+14, 1.0e+15])
assert_almost_equal(loc.tick_values(-1e15, 1e15), test_value)
def test_LinearLocator():
loc = mticker.LinearLocator(numticks=3)
test_value = np.array([-0.8, -0.3, 0.2])
assert_almost_equal(loc.tick_values(-0.8, 0.2), test_value)
def test_MultipleLocator():
loc = mticker.MultipleLocator(base=3.147)
test_value = np.array([-9.441, -6.294, -3.147, 0., 3.147, 6.294,
9.441, 12.588])
assert_almost_equal(loc.tick_values(-7, 10), test_value)
@cleanup
def test_AutoMinorLocator():
fig, ax = plt.subplots()
ax.set_xlim(0, 1.39)
ax.minorticks_on()
test_value = np.array([0.05, 0.1, 0.15, 0.25, 0.3, 0.35, 0.45,
0.5, 0.55, 0.65, 0.7, 0.75, 0.85, 0.9,
0.95, 1, 1.05, 1.1, 1.15, 1.25, 1.3, 1.35])
assert_almost_equal(ax.xaxis.get_ticklocs(minor=True), test_value)
def test_LogLocator():
loc = mticker.LogLocator(numticks=5)
assert_raises(ValueError, loc.tick_values, 0, 1000)
test_value = np.array([1.00000000e-05, 1.00000000e-03, 1.00000000e-01,
1.00000000e+01, 1.00000000e+03, 1.00000000e+05,
1.00000000e+07, 1.000000000e+09])
assert_almost_equal(loc.tick_values(0.001, 1.1e5), test_value)
loc = mticker.LogLocator(base=2)
test_value = np.array([0.5, 1., 2., 4., 8., 16., 32., 64., 128., 256.])
assert_almost_equal(loc.tick_values(1, 100), test_value)
def test_LinearLocator_set_params():
"""
Create linear locator with presets={}, numticks=2 and change it to
something else. See if change was successful. Should not exception.
"""
loc = mticker.LinearLocator(numticks=2)
loc.set_params(numticks=8, presets={(0, 1): []})
nose.tools.assert_equal(loc.numticks, 8)
nose.tools.assert_equal(loc.presets, {(0, 1): []})
def test_LogLocator_set_params():
"""
Create log locator with default value, base=10.0, subs=[1.0], numdecs=4,
numticks=15 and change it to something else.
See if change was successful.
Should not exception.
"""
loc = mticker.LogLocator()
loc.set_params(numticks=8, numdecs=8, subs=[2.0], base=8)
nose.tools.assert_equal(loc.numticks, 8)
nose.tools.assert_equal(loc.numdecs, 8)
nose.tools.assert_equal(loc.base, 8)
nose.tools.assert_equal(loc.subs, [2.0])
def test_NullLocator_set_params():
"""
Create null locator, and attempt to call set_params() on it.
Should not exception, and should raise a warning.
"""
loc = mticker.NullLocator()
with warnings.catch_warnings(record=True) as w:
loc.set_params()
nose.tools.assert_equal(len(w), 1)
def test_MultipleLocator_set_params():
"""
Create multiple locator with 0.7 base, and change it to something else.
See if change was successful.
Should not exception.
"""
mult = mticker.MultipleLocator(base=0.7)
mult.set_params(base=1.7)
nose.tools.assert_equal(mult._base, 1.7)
def test_LogitLocator_set_params():
"""
Create logit locator with default minor=False, and change it to something
else. See if change was successful. Should not exception.
"""
loc = mticker.LogitLocator() # Defaults to false.
loc.set_params(minor=True)
nose.tools.assert_true(loc.minor)
def test_FixedLocator_set_params():
"""
Create fixed locator with 5 nbins, and change it to something else.
See if change was successful.
Should not exception.
"""
fixed = mticker.FixedLocator(range(0, 24), nbins=5)
fixed.set_params(nbins=7)
nose.tools.assert_equal(fixed.nbins, 7)
def test_IndexLocator_set_params():
"""
Create index locator with 3 base, 4 offset. and change it to something
else. See if change was successful.
Should not exception.
"""
index = mticker.IndexLocator(base=3, offset=4)
index.set_params(base=7, offset=7)
nose.tools.assert_equal(index._base, 7)
nose.tools.assert_equal(index.offset, 7)
def test_SymmetricalLogLocator_set_params():
"""
Create symmetrical log locator with default subs =[1.0] numticks = 15,
and change it to something else.
See if change was successful.
Should not exception.
"""
# since we only test for the params change. I will pass empty transform
sym = mticker.SymmetricalLogLocator(None)
sym.set_params(subs=[2.0], numticks=8)
nose.tools.assert_equal(sym._subs, [2.0])
nose.tools.assert_equal(sym.numticks, 8)
@cleanup
def test_ScalarFormatter_offset_value():
fig, ax = plt.subplots()
formatter = ax.get_xaxis().get_major_formatter()
def check_offset_for(left, right, offset):
ax.set_xlim(left, right)
# Update ticks.
next(ax.get_xaxis().iter_ticks())
assert_equal(formatter.offset, offset)
test_data = [(123, 189, 0),
(-189, -123, 0),
(12341, 12349, 12340),
(-12349, -12341, -12340),
(99999.5, 100010.5, 100000),
(-100010.5, -99999.5, -100000),
(99990.5, 100000.5, 100000),
(-100000.5, -99990.5, -100000),
(1233999, 1234001, 1234000),
(-1234001, -1233999, -1234000),
(1, 1, 1),
(123, 123, 120),
# Test cases courtesy of @WeatherGod
(.4538, .4578, .45),
(3789.12, 3783.1, 3780),
(45124.3, 45831.75, 45000),
(0.000721, 0.0007243, 0.00072),
(12592.82, 12591.43, 12590),
(9., 12., 0),
(900., 1200., 0),
(1900., 1200., 0),
(0.99, 1.01, 1),
(9.99, 10.01, 10),
(99.99, 100.01, 100),
(5.99, 6.01, 6),
(15.99, 16.01, 16),
(-0.452, 0.492, 0),
(-0.492, 0.492, 0),
(12331.4, 12350.5, 12300),
(-12335.3, 12335.3, 0)]
for left, right, offset in test_data:
yield check_offset_for, left, right, offset
yield check_offset_for, right, left, offset
def _logfe_helper(formatter, base, locs, i, expected_result):
vals = base**locs
labels = [formatter(x, pos) for (x, pos) in zip(vals, i)]
nose.tools.assert_equal(labels, expected_result)
def test_LogFormatterExponent():
class FakeAxis(object):
"""Allow Formatter to be called without having a "full" plot set up."""
def __init__(self, vmin=1, vmax=10):
self.vmin = vmin
self.vmax = vmax
def get_view_interval(self):
return self.vmin, self.vmax
i = np.arange(-3, 4, dtype=float)
expected_result = ['-3', '-2', '-1', '0', '1', '2', '3']
for base in [2, 5.0, 10.0, np.pi, np.e]:
formatter = mticker.LogFormatterExponent(base=base)
formatter.axis = FakeAxis(1, base**4)
yield _logfe_helper, formatter, base, i, i, expected_result
# Should be a blank string for non-integer powers if labelOnlyBase=True
formatter = mticker.LogFormatterExponent(base=10, labelOnlyBase=True)
formatter.axis = FakeAxis()
nose.tools.assert_equal(formatter(10**0.1), '')
# Otherwise, non-integer powers should be nicely formatted
locs = np.array([0.1, 0.00001, np.pi, 0.2, -0.2, -0.00001])
i = range(len(locs))
expected_result = ['0.1', '1e-05', '3.14', '0.2', '-0.2', '-1e-05']
for base in [2, 5, 10, np.pi, np.e]:
formatter = mticker.LogFormatterExponent(base, labelOnlyBase=False)
formatter.axis = FakeAxis(1, base**10)
yield _logfe_helper, formatter, base, locs, i, expected_result
expected_result = ['3', '5', '12', '42']
locs = np.array([3, 5, 12, 42], dtype='float')
for base in [2, 5.0, 10.0, np.pi, np.e]:
formatter = mticker.LogFormatterExponent(base, labelOnlyBase=False)
formatter.axis = FakeAxis(1, base**50)
yield _logfe_helper, formatter, base, locs, i, expected_result
def _pprint_helper(value, domain, expected):
fmt = mticker.LogFormatter()
label = fmt.pprint_val(value, domain)
nose.tools.assert_equal(label, expected)
def test_logformatter_pprint():
test_cases = (
(3.141592654e-05, 0.001, '3.142e-5'),
(0.0003141592654, 0.001, '3.142e-4'),
(0.003141592654, 0.001, '3.142e-3'),
(0.03141592654, 0.001, '3.142e-2'),
(0.3141592654, 0.001, '3.142e-1'),
(3.141592654, 0.001, '3.142'),
(31.41592654, 0.001, '3.142e1'),
(314.1592654, 0.001, '3.142e2'),
(3141.592654, 0.001, '3.142e3'),
(31415.92654, 0.001, '3.142e4'),
(314159.2654, 0.001, '3.142e5'),
(1e-05, 0.001, '1e-5'),
(0.0001, 0.001, '1e-4'),
(0.001, 0.001, '1e-3'),
(0.01, 0.001, '1e-2'),
(0.1, 0.001, '1e-1'),
(1, 0.001, '1'),
(10, 0.001, '10'),
(100, 0.001, '100'),
(1000, 0.001, '1000'),
(10000, 0.001, '1e4'),
(100000, 0.001, '1e5'),
(3.141592654e-05, 0.015, '0'),
(0.0003141592654, 0.015, '0'),
(0.003141592654, 0.015, '0.003'),
(0.03141592654, 0.015, '0.031'),
(0.3141592654, 0.015, '0.314'),
(3.141592654, 0.015, '3.142'),
(31.41592654, 0.015, '31.416'),
(314.1592654, 0.015, '314.159'),
(3141.592654, 0.015, '3141.593'),
(31415.92654, 0.015, '31415.927'),
(314159.2654, 0.015, '314159.265'),
(1e-05, 0.015, '0'),
(0.0001, 0.015, '0'),
(0.001, 0.015, '0.001'),
(0.01, 0.015, '0.01'),
(0.1, 0.015, '0.1'),
(1, 0.015, '1'),
(10, 0.015, '10'),
(100, 0.015, '100'),
(1000, 0.015, '1000'),
(10000, 0.015, '10000'),
(100000, 0.015, '100000'),
(3.141592654e-05, 0.5, '0'),
(0.0003141592654, 0.5, '0'),
(0.003141592654, 0.5, '0.003'),
(0.03141592654, 0.5, '0.031'),
(0.3141592654, 0.5, '0.314'),
(3.141592654, 0.5, '3.142'),
(31.41592654, 0.5, '31.416'),
(314.1592654, 0.5, '314.159'),
(3141.592654, 0.5, '3141.593'),
(31415.92654, 0.5, '31415.927'),
(314159.2654, 0.5, '314159.265'),
(1e-05, 0.5, '0'),
(0.0001, 0.5, '0'),
(0.001, 0.5, '0.001'),
(0.01, 0.5, '0.01'),
(0.1, 0.5, '0.1'),
(1, 0.5, '1'),
(10, 0.5, '10'),
(100, 0.5, '100'),
(1000, 0.5, '1000'),
(10000, 0.5, '10000'),
(100000, 0.5, '100000'),
(3.141592654e-05, 5, '0'),
(0.0003141592654, 5, '0'),
(0.003141592654, 5, '0'),
(0.03141592654, 5, '0.03'),
(0.3141592654, 5, '0.31'),
(3.141592654, 5, '3.14'),
(31.41592654, 5, '31.42'),
(314.1592654, 5, '314.16'),
(3141.592654, 5, '3141.59'),
(31415.92654, 5, '31415.93'),
(314159.2654, 5, '314159.27'),
(1e-05, 5, '0'),
(0.0001, 5, '0'),
(0.001, 5, '0'),
(0.01, 5, '0.01'),
(0.1, 5, '0.1'),
(1, 5, '1'),
(10, 5, '10'),
(100, 5, '100'),
(1000, 5, '1000'),
(10000, 5, '10000'),
(100000, 5, '100000'),
(3.141592654e-05, 100, '0'),
(0.0003141592654, 100, '0'),
(0.003141592654, 100, '0'),
(0.03141592654, 100, '0'),
(0.3141592654, 100, '0.3'),
(3.141592654, 100, '3.1'),
(31.41592654, 100, '31.4'),
(314.1592654, 100, '314.2'),
(3141.592654, 100, '3141.6'),
(31415.92654, 100, '31415.9'),
(314159.2654, 100, '314159.3'),
(1e-05, 100, '0'),
(0.0001, 100, '0'),
(0.001, 100, '0'),
(0.01, 100, '0'),
(0.1, 100, '0.1'),
(1, 100, '1'),
(10, 100, '10'),
(100, 100, '100'),
(1000, 100, '1000'),
(10000, 100, '10000'),
(100000, 100, '100000'),
(3.141592654e-05, 1000000.0, '3.1e-5'),
(0.0003141592654, 1000000.0, '3.1e-4'),
(0.003141592654, 1000000.0, '3.1e-3'),
(0.03141592654, 1000000.0, '3.1e-2'),
(0.3141592654, 1000000.0, '3.1e-1'),
(3.141592654, 1000000.0, '3.1'),
(31.41592654, 1000000.0, '3.1e1'),
(314.1592654, 1000000.0, '3.1e2'),
(3141.592654, 1000000.0, '3.1e3'),
(31415.92654, 1000000.0, '3.1e4'),
(314159.2654, 1000000.0, '3.1e5'),
(1e-05, 1000000.0, '1e-5'),
(0.0001, 1000000.0, '1e-4'),
(0.001, 1000000.0, '1e-3'),
(0.01, 1000000.0, '1e-2'),
(0.1, 1000000.0, '1e-1'),
(1, 1000000.0, '1'),
(10, 1000000.0, '10'),
(100, 1000000.0, '100'),
(1000, 1000000.0, '1000'),
(10000, 1000000.0, '1e4'),
(100000, 1000000.0, '1e5')
)
for value, domain, expected in test_cases:
yield _pprint_helper, value, domain, expected
def test_use_offset():
for use_offset in [True, False]:
with matplotlib.rc_context({'axes.formatter.useoffset': use_offset}):
tmp_form = mticker.ScalarFormatter()
nose.tools.assert_equal(use_offset, tmp_form.get_useOffset())
def test_formatstrformatter():
# test % style formatter
tmp_form = mticker.FormatStrFormatter('%05d')
nose.tools.assert_equal('00002', tmp_form(2))
# test str.format() style formatter
tmp_form = mticker.StrMethodFormatter('{x:05d}')
nose.tools.assert_equal('00002', tmp_form(2))
def _percent_format_helper(xmax, decimals, symbol, x, display_range, expected):
formatter = mticker.PercentFormatter(xmax, decimals, symbol)
nose.tools.assert_equal(formatter.format_pct(x, display_range), expected)
# test str.format() style formatter with `pos`
tmp_form = mticker.StrMethodFormatter('{x:03d}-{pos:02d}')
nose.tools.assert_equal('002-01', tmp_form(2, 1))
def test_percentformatter():
test_cases = (
# Check explicitly set decimals over different intervals and values
(100, 0, '%', 120, 100, '120%'),
(100, 0, '%', 100, 90, '100%'),
(100, 0, '%', 90, 50, '90%'),
(100, 0, '%', 1.7, 40, '2%'),
(100, 1, '%', 90.0, 100, '90.0%'),
(100, 1, '%', 80.1, 90, '80.1%'),
(100, 1, '%', 70.23, 50, '70.2%'),
# 60.554 instead of 60.55: see https://bugs.python.org/issue5118
(100, 1, '%', 60.554, 40, '60.6%'),
# Check auto decimals over different intervals and values
(100, None, '%', 95, 1, '95.00%'),
(1.0, None, '%', 3, 6, '300%'),
(17.0, None, '%', 1, 8.5, '6%'),
(17.0, None, '%', 1, 8.4, '5.9%'),
(5, None, '%', -100, 0.000001, '-2000.00000%'),
# Check percent symbol
(1.0, 2, None, 1.2, 100, '120.00'),
(75, 3, '', 50, 100, '66.667'),
(42, None, '^^Foobar$$', 21, 12, '50.0^^Foobar$$'),
)
for case in test_cases:
yield (_percent_format_helper,) + case
def test_EngFormatter_formatting():
"""
Create two instances of EngFormatter with default parameters, with and
without a unit string ('s' for seconds). Test the formatting in some cases,
especially the case when no SI prefix is present, for values in [1, 1000).
Should not raise exceptions.
"""
unitless = mticker.EngFormatter()
nose.tools.assert_equal(unitless(0.1), u'100 m')
nose.tools.assert_equal(unitless(1), u'1')
nose.tools.assert_equal(unitless(999.9), u'999.9')
nose.tools.assert_equal(unitless(1001), u'1.001 k')
with_unit = mticker.EngFormatter(unit=u's')
nose.tools.assert_equal(with_unit(0.1), u'100 ms')
nose.tools.assert_equal(with_unit(1), u'1 s')
nose.tools.assert_equal(with_unit(999.9), u'999.9 s')
nose.tools.assert_equal(with_unit(1001), u'1.001 ks')
if __name__ == '__main__':
import nose
nose.runmodule(argv=['-s', '--with-doctest'], exit=False)