recaman.py

Created by schraf
Created on June 24, 2025
969 Bytes
from turtle import *
from math import copysign
from kandinsky import fill_rect

fill_rect(0,0,320,222,(0,0,0))

def couleur(n):
    couleurs = (255, 0, 0), (255, 127, 0), (255, 255, 0), (0, 255, 0), (0, 0, 255), (127, 0, 255)
    dizaine = n // 10
    index = dizaine % len(couleurs)
    return couleurs[index]

def demi_cercle(x, y):
    rayon = abs(y - x) // 2
    penup()
    goto(x - 150, 0)
    pendown()
    circle(int(rayon * sens), 180)

def suite_recaman(n_terms):
    global orient, sens
    prev, seen = 0, {0}
    for n in range(1, n_terms + 1):
        suiv = prev - n
        if suiv <= 0 or suiv in seen: suiv = prev + n
        seen.add(suiv)
        setheading(orient)
        sens = - copysign(1,orient)
        if suiv < prev: sens = - sens 
        color(couleur(n))
        demi_cercle(3 * prev, 3 * suiv)
        prev = suiv
        orient = - orient
        
        
speed(0)
pensize(2)
orient = -90
suite_recaman(66)
hideturtle()