cpython/Demo/turtle/tdemo_chaos.py

64 lines
1021 B
Python

# 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()