Add translucent legend example from John Hunter's mailing list example.

dopplershift · dopplershift · commit 4794d807d9e6 · 2009-07-21T17:30:20.000Z
svn path=/trunk/matplotlib/; revision=7279
diff --git a/examples/pylab_examples/legend_translucent.py b/examples/pylab_examples/legend_translucent.py
@@ -0,0 +1,18 @@
+#!/usr/bin/python
+#
+# Show how to add a translucent legend
+
+# import pyplot module
+import matplotlib.pyplot as plt
+
+# draw 2 crossing lines
+plt.plot([0,1], label='going up')
+plt.plot([1,0], label='going down')
+
+# add the legend in the middle of the plot
+leg = plt.legend(fancybox=True, loc='center')
+# set the alpha value of the legend: it will be translucent
+leg.get_frame().set_alpha(0.5)
+
+# show the plot
+plt.show()
