SF.net SVN: matplotlib:[7179] trunk/matplotlib/examples/pylab_examples/ fill_between.py

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

Revision: 7179
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=7179&view=rev
Author:   jdh2358
Date:     2009-06-05 16:49:29 +0000 (Fri, 05 Jun 2009)

Log Message:
-----------
added example to fill_between to show how to create multiple axes spans where a condition is true

Modified Paths:
--------------
    trunk/matplotlib/examples/pylab_examples/fill_between.py

Modified: trunk/matplotlib/examples/pylab_examples/fill_between.py
===================================================================
--- trunk/matplotlib/examples/pylab_examples/fill_between.py	2009-06-05 13:00:47 UTC (rev 7178)
+++ trunk/matplotlib/examples/pylab_examples/fill_between.py	2009-06-05 16:49:29 UTC (rev 7179)
@@ -46,5 +46,21 @@
 # points.  A brute-force solution would be to interpolate all
 # arrays to a very fine grid before plotting.
 
+# show how to use transforms to create axes spans where a certain condition is satisfied
+fig = figure()
+ax = fig.add_subplot(111)
+y = np.sin(4*np.pi*x)
+ax.plot(x, y, color='black')
+
+# use the data coordinates for the x-axis and the axes coordinates for the y-axis
+import matplotlib.transforms as mtransforms
+trans = mtransforms.blended_transform_factory(ax.transData, ax.transAxes)
+ax.axhline(0.5, color='green', lw=2, alpha=0.5)
+ax.axhline(-0.5, color='red', lw=2, alpha=0.5)
+ax.fill_between(x, 0, 1, where=y2>0.5, facecolor='green', alpha=0.5, transform=trans)
+ax.fill_between(x, 0, 1, where=y2<-0.5, facecolor='red', alpha=0.5, transform=trans)
+
+
+
 show()
 


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