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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Demo » threads » wpi.py
# Display digits of pi in a window, calculating in a separate thread.
# Compare ../scripts/pi.py.

import sys
import time
import thread
import stdwin
from stdwinevents import *

ok = 1

digits = []

def worker():
  k, a, b, a1, b1 = 2l, 4l, 1l, 12l, 4l
  while ok:
    # Next approximation
    p, q, k = k*k, 2l*k+1l, k+1l
    a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
    # Print common digits
    d, d1 = a/b, a1/b1
    #print a, b, a1, b1
    while d == d1:
      digits.append(`int(d)`)
      a, a1 = 10l*(a%b), 10l*(a1%b1)
      d, d1 = a/b, a1/b1

def main():
  global ok
  digits_seen = 0
  thread.start_new_thread(worker, ())
  tw = stdwin.textwidth('0 ')
  lh = stdwin.lineheight()
  stdwin.setdefwinsize(20 * tw, 20 * lh)
  stdwin.setdefscrollbars(0, 1)
  win = stdwin.open('digits of pi')
  options = win.menucreate('Options')
  options.additem('Auto scroll')
  autoscroll = 1
  options.check(0, autoscroll)
  while 1:
    win.settimer(1)
    type, w, detail = stdwin.getevent()
    if type == WE_CLOSE:
      ok = 0
      sys.exit(0)
    elif type == WE_DRAW:
      (left, top), (right, bottom) = detail
      digits_seen = len(digits)
      d = win.begindrawing()
      for i in range(digits_seen):
        h = (i % 20) * tw
        v = (i / 20) * lh
        if top-lh < v < bottom:
          d.text((h, v), digits[i])
      d.close()
    elif type == WE_TIMER:
      n = len(digits)
      if n > digits_seen:
        win.settitle(`n` + ' digits of pi')
        d = win.begindrawing()
        for i in range(digits_seen, n):
          h = (i % 20) * tw
          v = (i / 20) * lh
          d.text((h, v), digits[i])
        d.close()
        digits_seen = n
        height = (v + 20*lh) / (20*lh) * (20*lh)
        win.setdocsize(0, height)
        if autoscroll:
          win.show((0, v), (h+tw, v+lh))
    elif type == WE_MENU:
      menu, item = detail
      if menu == options:
        if item == 0:
          autoscroll = (not autoscroll)
          options.check(0, autoscroll)
          

main()
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