日期刻度定位器和格式化程序#

此示例说明了各种日期定位器和格式化程序的用法和效果。

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)

参考

此示例中显示了以下函数、方法、类和模块的使用：

脚本总运行时间：（0分2.097秒）

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