Patch #1513695: New turtle module, with demos.
diff --git a/Demo/turtle/tdemo_chaos.py b/Demo/turtle/tdemo_chaos.py
new file mode 100644
index 0000000..55b4bbd
--- /dev/null
+++ b/Demo/turtle/tdemo_chaos.py
@@ -0,0 +1,63 @@
+# Datei: chaosplotter.py
+# Autor: Gregor Lingl
+# Datum: 31. 5. 2008
+
+# Ein einfaches Programm zur Demonstration von "chaotischem Verhalten".
+
+from turtle import *
+
+def f(x):
+ return 3.9*x*(1-x)
+
+def g(x):
+ return 3.9*(x-x**2)
+
+def h(x):
+ return 3.9*x-3.9*x*x
+
+def coosys():
+ penup()
+ goto(-1,0)
+ pendown()
+ goto(n+1,0)
+ penup()
+ goto(0, -0.1)
+ pendown()
+ goto(-0.1, 1.1)
+
+def plot(fun, start, farbe):
+ x = start
+ pencolor(farbe)
+ penup()
+ goto(0, x)
+ pendown()
+ dot(5)
+ for i in range(n):
+ x=fun(x)
+ goto(i+1,x)
+ dot(5)
+
+def main():
+ global n
+ n = 80
+ ox=-250.0
+ oy=-150.0
+ ex= -2.0*ox / n
+ ey=300.0
+
+ reset()
+ setworldcoordinates(-1.0,-0.1, n+1, 1.1)
+ speed(0)
+ hideturtle()
+ coosys()
+ plot(f, 0.35, "blue")
+ plot(g, 0.35, "green")
+ plot(h, 0.35, "red")
+ for s in range(100):
+ setworldcoordinates(0.5*s,-0.1, n+1, 1.1)
+
+ return "Done!"
+
+if __name__ == "__main__":
+ main()
+ mainloop()