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Merge pull request #7084 from rougier/ticks
DOC: Tick locators & formatters examples
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‎examples/ticks_and_spines/tick-formatters.py

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"""
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Show the different tick formatters
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"""
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import numpy as np
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import matplotlib.pyplot as plt
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import matplotlib.ticker as ticker
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# Setup a plot such that only the bottom spine is shown
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def setup(ax):
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ax.spines['right'].set_color('none')
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ax.spines['left'].set_color('none')
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ax.yaxis.set_major_locator(ticker.NullLocator())
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.tick_params(which='major', width=1.00, length=5)
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ax.tick_params(which='minor', width=0.75, length=2.5, labelsize=10)
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ax.set_xlim(0, 5)
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ax.set_ylim(0, 1)
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ax.patch.set_alpha(0.0)
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plt.figure(figsize=(8, 6))
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n = 6
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# Null formatter
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ax = plt.subplot(n, 1, 1)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
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ax.xaxis.set_major_formatter(ticker.NullFormatter())
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ax.xaxis.set_minor_formatter(ticker.NullFormatter())
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ax.text(0.0, 0.5, "NullFormatter()", fontsize=16, transform=ax.transAxes)
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# Fixed formatter
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ax = plt.subplot(n, 1, 2)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(1.0))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
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majors = ["", "0", "1", "2", "3", "4", "5"]
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ax.xaxis.set_major_formatter(ticker.FixedFormatter(majors))
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minors = [""] + ["%.2f" % (x-int(x)) if (x-int(x))
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else "" for x in np.arange(0, 5, 0.25)]
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ax.xaxis.set_minor_formatter(ticker.FixedFormatter(minors))
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ax.text(0.0, 0.5, "FixedFormatter(['', '0', '1', ...])",
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fontsize=15, transform=ax.transAxes)
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# Func formatter
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def major_formatter(x, pos):
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return "[%.2f]" % x
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ax = plt.subplot(n, 1, 3)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
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ax.xaxis.set_major_formatter(ticker.FuncFormatter(major_formatter))
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ax.text(0.0, 0.5, 'FuncFormatter(lambda x, pos: "[%.2f]" % x)',
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fontsize=15, transform=ax.transAxes)
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# FormatStr formatter
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ax = plt.subplot(n, 1, 4)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
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ax.xaxis.set_major_formatter(ticker.FormatStrFormatter(">%d<"))
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ax.text(0.0, 0.5, "FormatStrFormatter('>%d<')",
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fontsize=15, transform=ax.transAxes)
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# Scalar formatter
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ax = plt.subplot(n, 1, 5)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.AutoLocator())
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ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
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ax.xaxis.set_major_formatter(ticker.ScalarFormatter(useMathText=True))
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ax.text(0.0, 0.5, "ScalarFormatter()", fontsize=15, transform=ax.transAxes)
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# StrMethod formatter
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ax = plt.subplot(n, 1, 6)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
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ax.xaxis.set_major_formatter(ticker.StrMethodFormatter("{x}"))
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ax.text(0.0, 0.5, "StrMethodFormatter('{x}')",
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fontsize=15, transform=ax.transAxes)
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plt.show()

‎examples/ticks_and_spines/tick-locators.py

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"""
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Show the different tick locators
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"""
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import numpy as np
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import matplotlib.pyplot as plt
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import matplotlib.ticker as ticker
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# Setup a plot such that only the bottom spine is shown
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def setup(ax):
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ax.spines['right'].set_color('none')
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ax.spines['left'].set_color('none')
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ax.yaxis.set_major_locator(ticker.NullLocator())
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.tick_params(which='major', width=1.00)
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ax.tick_params(which='major', length=5)
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ax.tick_params(which='minor', width=0.75)
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ax.tick_params(which='minor', length=2.5)
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ax.set_xlim(0, 5)
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ax.set_ylim(0, 1)
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ax.patch.set_alpha(0.0)
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plt.figure(figsize=(8, 8))
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n = 8
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# Null Locator
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ax = plt.subplot(n, 1, 1)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.NullLocator())
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ax.xaxis.set_minor_locator(ticker.NullLocator())
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ax.text(0.0, 0.5, "NullLocator()", fontsize=14, transform=ax.transAxes)
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# Multiple Locator
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ax = plt.subplot(n, 1, 2)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MultipleLocator(0.5))
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ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.1))
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ax.text(0.0, 0.5, "MultipleLocator(0.5)", fontsize=14,
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transform=ax.transAxes)
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# Fixed Locator
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ax = plt.subplot(n, 1, 3)
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setup(ax)
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majors = [0, 1, 5]
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ax.xaxis.set_major_locator(ticker.FixedLocator(majors))
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minors = np.linspace(0, 1, 11)[1:-1]
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ax.xaxis.set_minor_locator(ticker.FixedLocator(minors))
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ax.text(0.0, 0.5, "FixedLocator([0, 1, 5])", fontsize=14,
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transform=ax.transAxes)
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# Linear Locator
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ax = plt.subplot(n, 1, 4)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.LinearLocator(3))
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ax.xaxis.set_minor_locator(ticker.LinearLocator(31))
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ax.text(0.0, 0.5, "LinearLocator(numticks=3)",
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fontsize=14, transform=ax.transAxes)
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# Index Locator
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ax = plt.subplot(n, 1, 5)
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setup(ax)
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ax.plot(range(0, 5), [0]*5, color='White')
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ax.xaxis.set_major_locator(ticker.IndexLocator(base=.5, offset=.25))
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ax.text(0.0, 0.5, "IndexLocator(base=0.5, offset=0.25)",
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fontsize=14, transform=ax.transAxes)
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# Auto Locator
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ax = plt.subplot(n, 1, 6)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.AutoLocator())
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ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
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ax.text(0.0, 0.5, "AutoLocator()", fontsize=14, transform=ax.transAxes)
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# MaxN Locator
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ax = plt.subplot(n, 1, 7)
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setup(ax)
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ax.xaxis.set_major_locator(ticker.MaxNLocator(4))
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ax.xaxis.set_minor_locator(ticker.MaxNLocator(40))
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ax.text(0.0, 0.5, "MaxNLocator(n=4)", fontsize=14, transform=ax.transAxes)
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# Log Locator
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ax = plt.subplot(n, 1, 8)
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setup(ax)
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ax.set_xlim(10**3, 10**10)
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ax.set_xscale('log')
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ax.xaxis.set_major_locator(ticker.LogLocator(base=10.0, numticks=15))
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ax.text(0.0, 0.5, "LogLocator(base=10, numticks=15)",
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fontsize=15, transform=ax.transAxes)
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plt.show()

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