Added new example with real-time multiple signals.

Author: rossant

examples/realtime_multi.py

@@ -0,0 +1,39 @@
+"""Real-time example.
+
+This example shows how a real-time visualizer of multiple digital signals can
+be written with Galry.
+
+"""
+import numpy as np
+from galry import *
+
+# initial values
+nsamples = 1000
+nplots = 10
+t = np.tile(np.linspace(-1., 1., nsamples), (nplots, 1))
+x = .01 * np.random.randn(nplots, nsamples) + np.linspace(-.75, .75, nplots)[:,np.newaxis]
+
+# this function returns 10*nplots new values at each call
+def get_new_data():
+    return .01 * np.random.randn(nplots, 10) + np.linspace(-.75, .75, nplots)[:,np.newaxis]
+
+# this function updates the plot at each call
+def anim(fig, _):
+    # append new data to the signal
+    global x
+    x = np.hstack((x[:,10:], get_new_data()))
+    
+    # create the new 1000*nplots*2 position array with x, y values at each row
+    position = np.vstack((t.flatten(), x.flatten())).T
+    
+    # update the position of the plot
+    fig.set_data(position=position)
+
+# plot the signal
+plot(t, x)
+
+# animate the plot: anim is called every 25 milliseconds
+animate(anim, dt=.025)
+
+# show the figure
+show()