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comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/lib/python3.8/turtledemo/chaos.py @ 68:5028fdace37b

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planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
author jpayne
date Tue, 18 Mar 2025 16:23:26 -0400
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1 # File: tdemo_chaos.py
2 # Author: Gregor Lingl
3 # Date: 2009-06-24
4
5 # A demonstration of chaos
6
7 from turtle import *
8
9 N = 80
10
11 def f(x):
12 return 3.9*x*(1-x)
13
14 def g(x):
15 return 3.9*(x-x**2)
16
17 def h(x):
18 return 3.9*x-3.9*x*x
19
20 def jumpto(x, y):
21 penup(); goto(x,y)
22
23 def line(x1, y1, x2, y2):
24 jumpto(x1, y1)
25 pendown()
26 goto(x2, y2)
27
28 def coosys():
29 line(-1, 0, N+1, 0)
30 line(0, -0.1, 0, 1.1)
31
32 def plot(fun, start, color):
33 pencolor(color)
34 x = start
35 jumpto(0, x)
36 pendown()
37 dot(5)
38 for i in range(N):
39 x=fun(x)
40 goto(i+1,x)
41 dot(5)
42
43 def main():
44 reset()
45 setworldcoordinates(-1.0,-0.1, N+1, 1.1)
46 speed(0)
47 hideturtle()
48 coosys()
49 plot(f, 0.35, "blue")
50 plot(g, 0.35, "green")
51 plot(h, 0.35, "red")
52 # Now zoom in:
53 for s in range(100):
54 setworldcoordinates(0.5*s,-0.1, N+1, 1.1)
55 return "Done!"
56
57 if __name__ == "__main__":
58 main()
59 mainloop()