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81 lines
1.8 KiB
Python
81 lines
1.8 KiB
Python
# Display digits of pi in a window, calculating in a separate thread.
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# Compare ../scripts/pi.py.
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import sys
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import time
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import thread
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import stdwin
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from stdwinevents import *
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ok = 1
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digits = []
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def worker():
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k, a, b, a1, b1 = 2l, 4l, 1l, 12l, 4l
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while ok:
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# Next approximation
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p, q, k = k*k, 2l*k+1l, k+1l
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a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
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# Print common digits
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d, d1 = a/b, a1/b1
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#print a, b, a1, b1
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while d == d1:
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digits.append(`int(d)`)
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a, a1 = 10l*(a%b), 10l*(a1%b1)
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d, d1 = a/b, a1/b1
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def main():
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global ok
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digits_seen = 0
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thread.start_new_thread(worker, ())
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tw = stdwin.textwidth('0 ')
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lh = stdwin.lineheight()
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stdwin.setdefwinsize(20 * tw, 20 * lh)
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stdwin.setdefscrollbars(0, 1)
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win = stdwin.open('digits of pi')
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options = win.menucreate('Options')
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options.additem('Auto scroll')
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autoscroll = 1
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options.check(0, autoscroll)
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while 1:
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win.settimer(1)
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type, w, detail = stdwin.getevent()
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if type == WE_CLOSE:
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ok = 0
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sys.exit(0)
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elif type == WE_DRAW:
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(left, top), (right, bottom) = detail
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digits_seen = len(digits)
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d = win.begindrawing()
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for i in range(digits_seen):
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h = (i % 20) * tw
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v = (i / 20) * lh
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if top-lh < v < bottom:
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d.text((h, v), digits[i])
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d.close()
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elif type == WE_TIMER:
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n = len(digits)
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if n > digits_seen:
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win.settitle(`n` + ' digits of pi')
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d = win.begindrawing()
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for i in range(digits_seen, n):
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h = (i % 20) * tw
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v = (i / 20) * lh
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d.text((h, v), digits[i])
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d.close()
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digits_seen = n
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height = (v + 20*lh) / (20*lh) * (20*lh)
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win.setdocsize(0, height)
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if autoscroll:
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win.show((0, v), (h+tw, v+lh))
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elif type == WE_MENU:
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menu, item = detail
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if menu == options:
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if item == 0:
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autoscroll = (not autoscroll)
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options.check(0, autoscroll)
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main()
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