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# 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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