Revision: 6906
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=6906&view=rev
Author: ryanmay
Date: 2009-02-12 20:05:10 +0000 (Thu, 12 Feb 2009)
Log Message:
-----------
Add a demo for getting notified of an Axes' change in view limits.
Added Paths:
-----------
branches/v0_98_5_maint/examples/event_handling/viewlims.py
Added: branches/v0_98_5_maint/examples/event_handling/viewlims.py
===================================================================
--- branches/v0_98_5_maint/examples/event_handling/viewlims.py
(rev 0)
+++ branches/v0_98_5_maint/examples/event_handling/viewlims.py 2009-02-12
20:05:10 UTC (rev 6906)
@@ -0,0 +1,34 @@
+# Creates two identical panels. Zooming in on the right panel will show
+# a rectangle in the first panel, denoting the zoomed region.
+import numpy as np
+import matplotlib.pyplot as plt
+from matplotlib.patches import Rectangle
+
+# We just subclass Rectangle so that it can be called with an Axes
+# instance, causing the rectangle to update its shape to match the
+# bounds of the Axes
+class UpdatingRect(Rectangle):
+ def __call__(self, ax):
+ self.set_bounds(*ax.viewLim.bounds)
+ ax.figure.canvas.draw_idle()
+
+x = np.linspace(-3., 3., 20)
+y = np.linspace(-3., 3., 20).reshape(-1,1)
+Z = (1- x/2 + x**5 + y**3)*np.exp(-x**2-y**2)
+
+fig = plt.figure()
+ax1 = fig.add_subplot(1, 2, 1)
+ax1.pcolor(x, y, Z)
+
+ax2 = fig.add_subplot(1, 2, 2)
+ax2.pcolor(x, y, Z)
+
+rect = UpdatingRect([0, 0], 0, 0, facecolor='None', edgecolor='black')
+rect.set_bounds(*ax2.viewLim.bounds)
+ax1.add_patch(rect)
+
+# Connect for changing the view limits
+ax2.callbacks.connect('xlim_changed', rect)
+ax2.callbacks.connect('ylim_changed', rect)
+
+plt.show()
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