An example of a multi-threaded Tkinter program.
diff --git a/Demo/tkinter/guido/brownian.py b/Demo/tkinter/guido/brownian.py
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+# An example of a multi-threaded Tkinter program.
+
+from Tkinter import *
+import random
+import threading
+import time
+import sys
+
+WIDTH = 400
+HEIGHT = 300
+SIGMA = 10
+BUZZ = 2
+RADIUS = 2
+LAMBDA = 10
+FILL = 'red'
+
+def particle(canvas):
+ r = RADIUS
+ x = random.gauss(WIDTH/2.0, SIGMA)
+ y = random.gauss(HEIGHT/2.0, SIGMA)
+ p = canvas.create_oval(x-r, y-r, x+r, y+r, fill=FILL)
+ while 1:
+ dx = random.gauss(0, BUZZ)
+ dy = random.gauss(0, BUZZ)
+ try:
+ canvas.move(p, dx, dy)
+ except TclError:
+ break
+ dt = random.expovariate(LAMBDA)
+ time.sleep(dt)
+
+def main():
+ root = Tk()
+ canvas = Canvas(root, width=WIDTH, height=HEIGHT)
+ canvas.pack(fill='both', expand=1)
+ np = 30
+ if sys.argv[1:]:
+ np = int(sys.argv[1])
+ for i in range(np):
+ t = threading.Thread(target=particle, args=(canvas,))
+ t.start()
+ root.mainloop()
+
+main()