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Issue 6340: update by Gregor Lingl of his tdemo_chaos demo program.

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Functionally equivalent, clearer code, English comments.
This commit is contained in:
R. David Murray 2009-06-25 17:29:39 +00:00
parent 5c3d40e0f3
commit 1666f19317
1 changed files with 24 additions and 28 deletions
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52
Demo/turtle/tdemo_chaos.py
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@ -1,11 +1,13 @@
# Datei: chaosplotter.py # File: tdemo_chaos.py
# Autor: Gregor Lingl # Author: Gregor Lingl
# Datum: 31. 5. 2008 # Date: 2009-06-24
# Ein einfaches Programm zur Demonstration von "chaotischem Verhalten". # A demonstration of chaos
from turtle import * from turtle import *
N = 80
def f(x): def f(x):
return 3.9*x*(1-x) return 3.9*x*(1-x)
@ -15,47 +17,41 @@ def g(x):
def h(x): def h(x):
return 3.9*x-3.9*x*x return 3.9*x-3.9*x*x
def coosys(): def jumpto(x, y):
penup() penup(); goto(x,y)
goto(-1,0)
pendown()
goto(n+1,0)
penup()
goto(0, -0.1)
pendown()
goto(-0.1, 1.1)
def plot(fun, start, farbe): def line(x1, y1, x2, y2):
jumpto(x1, y1)
pendown()
goto(x2, y2)
def coosys():
line(-1, 0, N+1, 0)
line(0, -0.1, 0, 1.1)
def plot(fun, start, colour):
pencolor(colour)
x = start x = start
pencolor(farbe) jumpto(0, x)
penup()
goto(0, x)
pendown() pendown()
dot(5) dot(5)
for i in range(n): for i in range(N):
x=fun(x) x=fun(x)
goto(i+1,x) goto(i+1,x)
dot(5) dot(5)
def main(): def main():
global n
n = 80
ox=-250.0
oy=-150.0
ex= -2.0*ox / n
ey=300.0
reset() reset()
setworldcoordinates(-1.0,-0.1, n+1, 1.1) setworldcoordinates(-1.0,-0.1, N+1, 1.1)
speed(0) speed(0)
hideturtle() hideturtle()
coosys() coosys()
plot(f, 0.35, "blue") plot(f, 0.35, "blue")
plot(g, 0.35, "green") plot(g, 0.35, "green")
plot(h, 0.35, "red") plot(h, 0.35, "red")
# Now zoom in:
for s in range(100): for s in range(100):
setworldcoordinates(0.5*s,-0.1, n+1, 1.1) setworldcoordinates(0.5*s,-0.1, N+1, 1.1)
return "Done!" return "Done!"
if __name__ == "__main__": if __name__ == "__main__":