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+# Brownian motion -- an example of a NON multi-threaded Tkinter program ;)
+# By Michele Simoniato, inspired by brownian.py
+
+from Tkinter import *
+import random
+import sys
+
+WIDTH = 400
+HEIGHT = 300
+SIGMA = 10
+BUZZ = 2
+RADIUS = 2
+LAMBDA = 10
+FILL = 'red'
+
+stop = 0 # Set when main loop exits
+root = None # main window
+
+def particle(canvas): # particle = iterator over the moves
+ 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)
+ try:
+ canvas.move(p, dx, dy)
+ except TclError:
+ break
+ else:
+ yield None
+
+def move(particle): # move the particle at random time
+ particle.next()
+ dt = random.expovariate(LAMBDA)
+ root.after(int(dt*1000), move, particle)
+
+def main():
+ global root, 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): # start the dance
+ move(particle(canvas))
+ try:
+ root.mainloop()
+ finally:
+ stop = 1
+
+if __name__ == '__main__':
+ main()