updated slider widget example

svn path=/trunk/matplotlib/; revision=6197

Author: jdh2358

examples/widgets/slider_demo.py

@@ -0,0 +1,43 @@
+from pylab import *
+from matplotlib.widgets import Slider, Button, RadioButtons
+
+ax = subplot(111)
+subplots_adjust(left=0.25, bottom=0.25)
+t = arange(0.0, 1.0, 0.001)
+a0 = 5
+f0 = 3
+s = a0*sin(2*pi*f0*t)
+l, = plot(t,s, lw=2, color='red')
+axis([0, 1, -10, 10])
+
+axcolor = 'lightgoldenrodyellow'
+axfreq = axes([0.25, 0.1, 0.65, 0.03], axisbg=axcolor)
+axamp  = axes([0.25, 0.15, 0.65, 0.03], axisbg=axcolor)
+
+sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0)
+samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=a0)
+
+def update(val):
+    amp = samp.val
+    freq = sfreq.val
+    l.set_ydata(amp*sin(2*pi*freq*t))
+    draw()
+sfreq.on_changed(update)
+samp.on_changed(update)
+
+resetax = axes([0.8, 0.025, 0.1, 0.04])
+button = Button(resetax, 'Reset', color=axcolor, hovercolor=0.975)
+def reset(event):
+    sfreq.reset()
+    samp.reset()
+button.on_clicked(reset)
+
+rax = axes([0.025, 0.5, 0.15, 0.15], axisbg=axcolor)
+radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
+def colorfunc(label):
+    l.set_color(label)
+    draw()
+radio.on_clicked(colorfunc)
+
+show()
+