Initial revision
diff --git a/Demo/threads/wpi.py b/Demo/threads/wpi.py
new file mode 100644
index 0000000..e408d21
--- /dev/null
+++ b/Demo/threads/wpi.py
@@ -0,0 +1,74 @@
+# 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()