mirror of https://github.com/python/cpython
75 lines
1.7 KiB
Python
75 lines
1.7 KiB
Python
|
# Display digits of pi in a window, calculating in a separate thread.
|
||
|
|
# Compare ../scripts/pi.py.
|
||
|
|
|
||
|
|
import time
|
||
|
|
import thread
|
||
|
|
import stdwin
|
||
|
|
from stdwinevents import *
|
||
|
|
|
||
|
|
digits = []
|
||
|
|
|
||
|
|
def worker():
|
||
|
|
k, a, b, a1, b1 = 2l, 4l, 1l, 12l, 4l
|
||
|
|
while 1:
|
||
|
|
# 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():
|
||
|
|
digits_seen = 0
|
||
|
|
thread.start_new_thread(worker, ())
|
||
|
|
tw = stdwin.textwidth('0 ')
|
||
|
|
lh = stdwin.lineheight()
|
||
|
|
stdwin.setdefwinsize(20 * tw, 20 * lh)
|
||
|
|
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:
|
||
|
|
thread.exit_prog(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()
|