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tick-locators.py
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# ----------------------------------------------------------------------------
# Title: Scientific Visualisation - Python & Matplotlib
# Author: Nicolas P. Rougier
# License: BSD
# ----------------------------------------------------------------------------
import pathlib
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
ROOT_DIR = pathlib.Path(__file__).parent.parent
# Setup a plot such that only the bottom spine is shown
def setup(ax):
ax.spines['right'].set_color('none')
ax.spines['left'].set_color('none')
ax.yaxis.set_major_locator(ticker.NullLocator())
ax.spines['top'].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.tick_params(which='major', width=1.00)
ax.tick_params(which='major', length=5)
ax.tick_params(which='minor', width=0.75)
ax.tick_params(which='minor', length=2.5)
ax.set_xlim(0, 5)
ax.set_ylim(0, 1)
ax.patch.set_alpha(0.0)
fig = plt.figure(figsize=(8, 5))
fig.patch.set_alpha(0.0)
n = 8
fontsize = 18
family = "Source Code Pro"
# Null Locator
ax = plt.subplot(n, 1, 1)
setup(ax)
ax.xaxis.set_major_locator(ticker.NullLocator())
ax.xaxis.set_minor_locator(ticker.NullLocator())
ax.text(0.0, 0.1, "ticker.NullLocator()",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Multiple Locator
ax = plt.subplot(n, 1, 2)
setup(ax)
ax.xaxis.set_major_locator(ticker.MultipleLocator(0.5))
ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.1))
ax.text(0.0, 0.1, "ticker.MultipleLocator(0.5)",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Fixed Locator
ax = plt.subplot(n, 1, 3)
setup(ax)
majors = [0, 1, 5]
ax.xaxis.set_major_locator(ticker.FixedLocator(majors))
minors = np.linspace(0, 1, 11)[1:-1]
ax.xaxis.set_minor_locator(ticker.FixedLocator(minors))
ax.text(0.0, 0.1, "ticker.FixedLocator([0, 1, 5])",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Linear Locator
ax = plt.subplot(n, 1, 4)
setup(ax)
ax.xaxis.set_major_locator(ticker.LinearLocator(3))
ax.xaxis.set_minor_locator(ticker.LinearLocator(31))
ax.text(0.0, 0.1, "ticker.LinearLocator(numticks=3)",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Index Locator
ax = plt.subplot(n, 1, 5)
setup(ax)
ax.plot(range(0, 5), [0]*5, color='white')
ax.xaxis.set_major_locator(ticker.IndexLocator(base=.5, offset=.25))
ax.text(0.0, 0.1, "ticker.IndexLocator(base=0.5, offset=0.25)",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Auto Locator
ax = plt.subplot(n, 1, 6)
setup(ax)
ax.xaxis.set_major_locator(ticker.AutoLocator())
ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
ax.text(0.0, 0.1, "ticker.AutoLocator()",
family=family, fontsize=fontsize, transform=ax.transAxes)
# MaxN Locator
ax = plt.subplot(n, 1, 7)
setup(ax)
ax.xaxis.set_major_locator(ticker.MaxNLocator(4))
ax.xaxis.set_minor_locator(ticker.MaxNLocator(40))
ax.text(0.0, 0.1, "ticker.MaxNLocator(n=4)",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Log Locator
ax = plt.subplot(n, 1, 8)
setup(ax)
ax.set_xlim(10**3, 10**10)
ax.set_xscale('log')
ax.xaxis.set_major_locator(ticker.LogLocator(base=10.0, numticks=15))
ax.text(0.0, 0.1, "ticker.LogLocator(base=10, numticks=15)",
family=family, fontsize=fontsize, transform=ax.transAxes)
# Push the top of the top axes outside the figure because we only show the
# bottom spine.
plt.subplots_adjust(left=0.05, right=0.95, bottom=0.05, top=1.05)
fig.savefig(ROOT_DIR / "figures/tick-locators.pdf", transparent=True)
# plt.show()