1 files changed, 74 insertions, 0 deletions
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()