python开发_thread_布朗运动

这篇blog是非常有趣的，是的，他非常有趣

下面我将给大家介绍有关python中thread来实现布朗运动的一个例子

下面是运行效果：

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代码部分：

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 # Brownian motion -- an example of a multi-threaded Tkinter program.

 from tkinter import *
 import random
 import threading
 import time
 import sys

 #画布大小
 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)
     #粒子数目
     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()

更多资料：http://www.oschina.net/code/explore/Python-3.1.3/Demo/tkinter/guido/brownian.py

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