--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/python-2.6.1/Demo/tkinter/guido/brownian.py Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,50 @@
+# Brownian motion -- 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'
+
+stop = 0 # Set when main loop exits
+
+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 not stop:
+ dx = random.gauss(0, BUZZ)
+ dy = random.gauss(0, BUZZ)
+ dt = random.expovariate(LAMBDA)
+ try:
+ canvas.move(p, dx, dy)
+ except TclError:
+ break
+ time.sleep(dt)
+
+def main():
+ global stop
+ 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()
+ try:
+ root.mainloop()
+ finally:
+ stop = 1
+
+main()