Revision: 7499
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=7499&view=rev
Author: jdh2358
Date: 2009-08-18 05:15:21 +0000 (Tue, 18 Aug 2009)
Log Message:
-----------
added looking glass demo
Added Paths:
-----------
branches/v0_99_maint/examples/event_handling/looking_glass.py
Added: branches/v0_99_maint/examples/event_handling/looking_glass.py
===================================================================
--- branches/v0_99_maint/examples/event_handling/looking_glass.py
(rev 0)
+++ branches/v0_99_maint/examples/event_handling/looking_glass.py
2009-08-18 05:15:21 UTC (rev 7499)
@@ -0,0 +1,47 @@
+import numpy as np
+import matplotlib.pyplot as plt
+import matplotlib.patches as patches
+x, y = np.random.rand(2, 200)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+circ = patches.Circle( (0.5, 0.5), 0.25, alpha=0.8, fc='yellow')
+ax.add_patch(circ)
+
+
+ax.plot(x, y, alpha=0.2)
+line, = ax.plot(x, y, alpha=1.0, clip_path=circ)
+
+class EventHandler:
+ def __init__(self):
+ fig.canvas.mpl_connect('button_press_event', self.onpress)
+ fig.canvas.mpl_connect('button_release_event', self.onrelease)
+ fig.canvas.mpl_connect('motion_notify_event', self.onmove)
+ self.x0, self.y0 = circ.center
+ self.pressevent = None
+
+ def onpress(self, event):
+ if event.inaxes!=ax:
+ return
+
+ if not circ.contains(event):
+ return
+
+ self.pressevent = event
+
+ def onrelease(self, event):
+ self.pressevent = None
+ self.x0, self.y0 = circ.center
+
+ def onmove(self, event):
+ if self.pressevent is None or event.inaxes!=self.pressevent.inaxes:
+ return
+
+ dx = event.xdata - self.pressevent.xdata
+ dy = event.ydata - self.pressevent.ydata
+ circ.center = self.x0 + dx, self.y0 + dy
+ line.set_clip_path(circ)
+ fig.canvas.draw()
+
+handler = EventHandler()
+plt.show()
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