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EDIT :: brownian2.py

# 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()

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