| # Datei: chaosplotter.py |
| # Autor: Gregor Lingl |
| # Datum: 31. 5. 2008 |
| |
| # Ein einfaches Programm zur Demonstration von "chaotischem Verhalten". |
| |
| from tkinter.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() |