SF.net SVN: matplotlib:[7257] trunk/matplotlib/examples/pylab_examples/ centered_ticklabels.py

[<jd...@us...>]

Revision: 7257
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=7257&view=rev
Author:   jdh2358
Date:     2009-07-11 20:18:06 +0000 (Sat, 11 Jul 2009)

Log Message:
-----------
centered ticklabel examples

Added Paths:
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    trunk/matplotlib/examples/pylab_examples/centered_ticklabels.py

Added: trunk/matplotlib/examples/pylab_examples/centered_ticklabels.py
===================================================================
--- trunk/matplotlib/examples/pylab_examples/centered_ticklabels.py	                        (rev 0)
+++ trunk/matplotlib/examples/pylab_examples/centered_ticklabels.py	2009-07-11 20:18:06 UTC (rev 7257)
@@ -0,0 +1,44 @@
+# sometimes it is nice to have ticklabels centered.  mpl currently
+# associates a label with a tick, and the label can be aligned
+# 'center', 'feft', or 'right' using the horizontal alignment property:
+#
+#
+#   for label in ax.xaxis.get_xticklabels():
+#       label.set_horizntal_alignment('right')
+#
+#
+# but this doesn't help center the label between ticks.  One solution
+# is to "face it".  Use the minor ticks to place a tick centered
+# between the major ticks.  Here is an example that labels the months,
+# centered between the ticks
+
+import datetime
+import numpy as np
+import matplotlib
+import matplotlib.dates as dates
+import matplotlib.ticker as ticker
+import matplotlib.pyplot as plt
+
+# load some financial data; apple's stock price
+fh = matplotlib.get_example_data('aapl.npy')
+r = np.load(fh); fh.close()
+r = r[-250:]  # get the last 250 days
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.plot(r.date, r.adj_close)
+
+ax.xaxis.set_major_locator(dates.MonthLocator())
+ax.xaxis.set_minor_locator(dates.MonthLocator(bymonthday=15))
+
+ax.xaxis.set_major_formatter(ticker.NullFormatter())
+ax.xaxis.set_minor_formatter(dates.DateFormatter('%b'))
+
+for tick in ax.xaxis.get_minor_ticks():
+    tick.tick1line.set_markersize(0)
+    tick.tick2line.set_markersize(0)
+    tick.label1.set_horizontalalignment('center')
+
+imid = len(r)/2
+ax.set_xlabel(str(r.date[imid].year))
+plt.show()


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