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DOC: Add Date Tick Locators and Formatters example#21874

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jklymak merged 1 commit intomatplotlib:mainfromStefRe:date_fmt-loc_reference
Dec 7, 2021
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1 change: 1 addition & 0 deletions.flake8
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Original file line numberDiff line numberDiff line change
Expand Up@@ -120,6 +120,7 @@ per-file-ignores =
examples/subplots_axes_and_figures/demo_constrained_layout.py: E402
examples/text_labels_and_annotations/custom_legends.py: E402
examples/ticks/date_concise_formatter.py: E402
examples/ticks/date_formatters_locators.py: F401
examples/user_interfaces/embedding_in_gtk3_panzoom_sgskip.py: E402
examples/user_interfaces/embedding_in_gtk3_sgskip.py: E402
examples/user_interfaces/embedding_in_gtk4_panzoom_sgskip.py: E402
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92 changes: 92 additions & 0 deletionsexamples/ticks/date_formatters_locators.py
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"""
=================================
Date tick locators and formatters
=================================

This example illustrates the usage and effect of the various date locators and
formatters.
"""

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
from matplotlib.dates import (AutoDateLocator, YearLocator, MonthLocator,
DayLocator, WeekdayLocator, HourLocator,
MinuteLocator, SecondLocator, MicrosecondLocator,
RRuleLocator, rrulewrapper, MONTHLY,
MO, TU, WE, TH, FR, SA, SU, DateFormatter,
AutoDateFormatter, ConciseDateFormatter)

locators = [
('AutoDateLocator(maxticks=8)', '2003-02-01', '%Y-%m'),
('YearLocator(month=4)', '2003-02-01', '%Y-%m'),
('MonthLocator(bymonth=[4,8,12])', '2003-02-01', '%Y-%m'),
('DayLocator(interval=180)', '2003-02-01', '%Y-%m-%d'),
('WeekdayLocator(byweekday=SU, interval=4)', '2000-07-01', '%a %Y-%m-%d'),
('HourLocator(byhour=range(0,24,6))', '2000-02-04', '%H h'),
('MinuteLocator(interval=15)', '2000-02-01 02:00', '%H:%M'),
('SecondLocator(bysecond=(0,30))', '2000-02-01 00:02', '%H:%M:%S'),
('MicrosecondLocator(interval=1000)', '2000-02-01 00:00:00.005', '%S.%f'),
('RRuleLocator(rrulewrapper(freq=MONTHLY, \nbyweekday=(MO, TU, WE, TH,' +
' FR), bysetpos=-1))', '2000-07-01', '%Y-%m-%d')
]

formatters = [
('AutoDateFormatter(ax.xaxis.get_major_locator())'),
('ConciseDateFormatter(ax.xaxis.get_major_locator())'),
('DateFormatter("%b %Y")')
]


def plot_axis(ax, locator=None, xmax='2002-02-01', fmt=None, formatter=None):
"""Set up common parameters for the Axes in the example."""
ax.spines.right.set_visible(False)
ax.spines.left.set_visible(False)
ax.spines.top.set_visible(False)
ax.yaxis.set_major_locator(ticker.NullLocator())
ax.tick_params(which='major', width=1.00, length=5)
ax.tick_params(which='minor', width=0.75, length=2.5)
ax.set_xlim(np.datetime64('2000-02-01'), np.datetime64(xmax))
if locator:
ax.xaxis.set_major_locator(eval(locator))
ax.xaxis.set_major_formatter(DateFormatter(fmt))
else:
ax.xaxis.set_major_formatter(eval(formatter))
ax.text(0.0, 0.2, locator or formatter, transform=ax.transAxes,
fontsize=14, fontname='Monospace', color='tab:blue')


fig, ax = plt.subplots(len(locators), 1, figsize=(8, len(locators) * .8),
layout='constrained')
fig.suptitle('Date Locators')
for i, loc in enumerate(locators):
plot_axis(ax[i], *loc)

fig, ax = plt.subplots(len(formatters), 1, figsize=(8, len(formatters) * .8),
layout='constrained')
fig.suptitle('Date Formatters')
for i, fmt in enumerate(formatters):
plot_axis(ax[i], formatter=fmt)


#############################################################################
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.dates.AutoDateLocator`
# - `matplotlib.dates.YearLocator`
# - `matplotlib.dates.MonthLocator`
# - `matplotlib.dates.DayLocator`
# - `matplotlib.dates.WeekdayLocator`
# - `matplotlib.dates.HourLocator`
# - `matplotlib.dates.MinuteLocator`
# - `matplotlib.dates.SecondLocator`
# - `matplotlib.dates.MicrosecondLocator`
# - `matplotlib.dates.RRuleLocator`
# - `matplotlib.dates.rrulewrapper`
# - `matplotlib.dates.DateFormatter`
# - `matplotlib.dates.AutoDateFormatter`
# - `matplotlib.dates.ConciseDateFormatter`
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