# Q-12 MCS 275 Thu 8 Apr 2010 : quiz12b.py

# Soap bubbles start at a certain location (x,y,z),
# at a give radius r.  Each second the location shifts a little
# at random and also the radius r varies randomly.
# The bubble pops when it hits the ground (i.e.: z <= 0)
# or after t seconds.

# Inheriting from Thread, write a class Bubble
# to simulate the life cycle of a soap bubble as described above.
# After sleeping 1 second, each bubble prints all its data attributes.

from threading import *
from time import sleep
from random import randint

class Bubble(Thread):
   """
   simulating soap bubbles
   """
   def __init__(self,n,x,y,z,r,t):
      """
      Initializes a bubble with name n,
      coordinates (x,y,z), radius r,
      and time t.
      """
      Thread.__init__(self,name=n)
      print 'bubble ' + n + ' is born'
      self.position = (x,y,z)
      self.radius = r
      self.lifespan = t

   def run(self):
      """
      Every step the bubble sleeps a second
      and prints its status.
      """
      n = self.getName()
      while self.lifespan > 0 and self.position[2] > 0:
         s = n + ' at ' + str(self.position) \
           + ' with radius ' + str(self.radius) \
           + ' and lifespan ' + str(self.lifespan)
         print s
         sleep(1)
         (x,y,z) = self.position
         nx = x + randint(-1,+1)
         ny = y + randint(-1,+1)
         nz = z + randint(-1,+1)
         self.position = (nx,ny,nz)
         self.radius += randint(-1,+1)
         self.lifespan = self.lifespan - 1

def main():
   """
   Launches some bubbles.
   """
   a = Bubble('A',10,5,10,3,5)
   b = Bubble('B',5,10,15,4,4)
   a.start()
   b.start()

if __name__ == "__main__": main()