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Représentation d’une rosace chaleureuse en Python. Développé par Ilyas R. à l’occasion du DM E22.3 “Des fractales sur NumWorks” édition 2023-2024. #nsi_xyz

from turtle import pos, forward, backward, left, right, pencolor, colormode, speed
from kandinsky import *

fill_rect(0, 0, 320, 222, (42, 42, 42))
colormode(255)
speed(0)


def color(x, y):
    d = (abs(x) ** 2 + abs(y) ** 2) ** 0.5
    pencolor(255, round(((d + 20) / 220) * 255), 0)


def circle(r):
    for _ in range(360):
        color(pos()[0], pos()[1])
        move(1, r/60)
        left(1)
        
        
def move(t, px):
    t = backward if not t else forward if t else forward
    for _ in range(px):
        color(pos()[0], pos()[1])
        t(1)


def fractal(n, length):
    if n == 0:
        return
    else:
        color(pos()[0], pos()[1])
        move(1, length/3)
        circle(length)
        color(pos()[0], pos()[1])
        move(0, length/3*2)
        move(1, length/3)
        right(30)
        fractal(n - 1, length)


def run():
    for i in range(1, 3):
        fractal(12, 50*i)


run()