python开发_thread_布朗运动

 1 # Brownian motion -- an example of a multi-threaded Tkinter program.
 2 
 3 from tkinter import *
 4 import random
 5 import threading
 6 import time
 7 import sys
 8 
 9 #画布大小
10 WIDTH = 400
11 HEIGHT = 300
12 SIGMA = 10
13 BUZZ = 2
14 RADIUS = 2
15 LAMBDA = 10
16 FILL = 'red'
17 
18 stop = 0                                # Set when main loop exits
19 
20 def particle(canvas):
21     r = RADIUS
22     x = random.gauss(WIDTH/2.0, SIGMA)
23     y = random.gauss(HEIGHT/2.0, SIGMA)
24     p = canvas.create_oval(x-r, y-r, x+r, y+r, fill=FILL)
25     while not stop:
26         dx = random.gauss(0, BUZZ)
27         dy = random.gauss(0, BUZZ)
28         dt = random.expovariate(LAMBDA)
29         try:
30             canvas.move(p, dx, dy)
31         except TclError:
32             break
33         time.sleep(dt)
34 
35 def main():
36     global stop
37     root = Tk()
38     canvas = Canvas(root, width=WIDTH, height=HEIGHT)
39     canvas.pack(fill='both', expand=1)
40     #粒子数目
41     np = 30
42     if sys.argv[1:]:
43         np = int(sys.argv[1])
44     for i in range(np):
45         t = threading.Thread(target=particle, args=(canvas,))
46         t.start()
47     try:
48         root.mainloop()
49     finally:
50         stop = 1
51 
52 main()