mirror of https://github.com/python/cpython
64 lines
1021 B
Python
64 lines
1021 B
Python
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# Datei: chaosplotter.py
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# Autor: Gregor Lingl
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# Datum: 31. 5. 2008
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# Ein einfaches Programm zur Demonstration von "chaotischem Verhalten".
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from turtle import *
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def f(x):
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return 3.9*x*(1-x)
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def g(x):
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return 3.9*(x-x**2)
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def h(x):
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return 3.9*x-3.9*x*x
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def coosys():
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penup()
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goto(-1,0)
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pendown()
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goto(n+1,0)
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penup()
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goto(0, -0.1)
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pendown()
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goto(-0.1, 1.1)
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def plot(fun, start, farbe):
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x = start
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pencolor(farbe)
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penup()
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goto(0, x)
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pendown()
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dot(5)
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for i in range(n):
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x=fun(x)
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goto(i+1,x)
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dot(5)
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def main():
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global n
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n = 80
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ox=-250.0
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oy=-150.0
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ex= -2.0*ox / n
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ey=300.0
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reset()
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setworldcoordinates(-1.0,-0.1, n+1, 1.1)
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speed(0)
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hideturtle()
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coosys()
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plot(f, 0.35, "blue")
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plot(g, 0.35, "green")
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plot(h, 0.35, "red")
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for s in range(100):
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setworldcoordinates(0.5*s,-0.1, n+1, 1.1)
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return "Done!"
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if __name__ == "__main__":
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main()
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mainloop()
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