added buttons demo

jdh2358 · jdh2358 · commit a549ab09f1ad · 2005-06-14T20:47:10.000Z
svn path=/trunk/matplotlib/; revision=1453
diff --git a/examples/widgets/buttons.py b/examples/widgets/buttons.py
@@ -0,0 +1,38 @@
+from pylab import *
+from matplotlib.widgets import Button
+
+freqs = arange(2,20,3)
+
+ax = subplot(111)
+subplots_adjust(bottom=0.2)
+t = arange(0.0, 1.0, 0.001)
+s = sin(2*pi*freqs[0]*t)
+l, = plot(t,s, lw=2)
+
+
+class Index:
+    ind = 0
+    def next(self, event):
+        self.ind += 1
+        i = self.ind%len(freqs)
+        ydata = sin(2*pi*freqs[i]*t)
+        l.set_ydata(ydata)
+        draw()
+
+    def prev(self, event):
+        self.ind -= 1
+        i = self.ind%len(freqs)
+        ydata = sin(2*pi*freqs[i]*t)
+        l.set_ydata(ydata)
+        draw()
+
+callback = Index()
+axprev = axes([0.7, 0.05, 0.1, 0.075])
+axnext = axes([0.81, 0.05, 0.1, 0.075])
+bnext = Button(axnext, 'Next')
+bnext.on_clicked(callback.next) 
+bprev = Button(axprev, 'Previous')
+bprev.on_clicked(callback.prev)     
+
+show()
+
