Added tick formatters example

matplotlib · tacaswell · Sep 22, 2016 · Sep 10, 2016 · Sep 10, 2016 · Sep 10, 2016
commit bb7a4d9a1a8d5dec77ed3123e14f3b5e8c26bdca
diff --git a/examples/ticks_and_spines/tick-formatters.py b/examples/ticks_and_spines/tick-formatters.py
@@ -0,0 +1,94 @@
+"""
+Show the different tick formatters
+"""
+
+import numpy as np
+import matplotlib.pyplot as plt
+import matplotlib.ticker as ticker
+
+
+# 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, length=5)
+    ax.tick_params(which='minor', width=0.75, length=2.5, labelsize=10)
+    ax.set_xlim(0, 5)
+    ax.set_ylim(0, 1)
+    ax.patch.set_alpha(0.0)
+
+
+plt.figure(figsize=(8, 6))
+n = 6
+
+# Null formatter
+ax = plt.subplot(n, 1, 1)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
+ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
+ax.xaxis.set_major_formatter(ticker.NullFormatter())
+ax.xaxis.set_minor_formatter(ticker.NullFormatter())
+ax.text(0.0, 0.5, "Null formatter", fontsize=16, transform=ax.transAxes)
+
+# Fixed formatter
+ax = plt.subplot(n, 1, 2)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.MultipleLocator(1.0))
+ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
+majors = ["", "0", "1", "2", "3", "4", "5"]
+ax.xaxis.set_major_formatter(ticker.FixedFormatter(majors))
+minors = [""] + ["%.2f" % (x-int(x)) if (x-int(x))
+                 else "" for x in np.arange(0, 5, 0.25)]
+ax.xaxis.set_minor_formatter(ticker.FixedFormatter(minors))
+ax.text(0.0, 0.5, "Fixed formatter", fontsize=16, transform=ax.transAxes)
+
+
+# Func formatter
+def major_formatter(x, pos):
+    return "[%.2f]" % x
+
+
+def minor_formatter(x, pos):
+    return "(%.2f)" % x
+
+
+ax = plt.subplot(n, 1, 3)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
+ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
+ax.xaxis.set_major_formatter(ticker.FuncFormatter(major_formatter))
+ax.text(0.0, 0.5, "Func formatter", fontsize=16, transform=ax.transAxes)
+
+
+# FormatStr formatter
+ax = plt.subplot(n, 1, 4)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
+ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
+ax.xaxis.set_major_formatter(ticker.FormatStrFormatter(">%d<"))
+ax.text(0.0, 0.5, "FormatStr formatter", fontsize=16, transform=ax.transAxes)
+
+# Scalar formatter
+ax = plt.subplot(n, 1, 5)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.AutoLocator())
+ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
+ax.xaxis.set_major_formatter(ticker.ScalarFormatter(useMathText=True))
+ax.text(0.0, 0.5, "Scalar formatter", fontsize=16, transform=ax.transAxes)
+
+# StrMethod formatter
+ax = plt.subplot(n, 1, 6)
+setup(ax)
+ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
+ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
+ax.xaxis.set_major_formatter(ticker.StrMethodFormatter("{x}"))
+ax.text(0.0, 0.5, "StrMethod formatter", fontsize=16, transform=ax.transAxes)
+
+
+plt.tight_layout()
+# plt.savefig("tick-formatters.pdf")
+# plt.savefig("tick-formatters.png", dpi=150)
+plt.show()