spirographe2.py

Created by schraf

Created on September 15, 2019

428 Bytes

Construction d'une hypocycloïde

Trajectoire d’un point fixé à un cercle qui roule sans glisser sur un autre cercle dit directeur et à l’intérieur de celui-ci.

Autres courbes ici

>> go(7,2) (un tour ne suffit pas à tout afficher)

>> go(7,2,2) (on fait faire 2 tour au petit cercle. Mathématiquement, il faut chercher le plus petit multiple commun entre 7 et 2, à savoir 14, et diviser ce nombre par le premier paramètre (7) d’où 14/7 = 2 tours)


from kandinsky import *
from math import *
from random import *


def go(r1,r2,t=1,n=500):
  p = 100/(r1+r2)
  for k in range(t*n):
    a = k/n*2*pi
    x = 160 + r1*p*cos(a) 
    y = 110 + r1*p*sin(a)
    set_pixel(int(x),int(y),color(255,0,0))
    x += r2*p*cos(a*(r1-r2)/r2) - r2*p*cos(a)
    y -= r2*p*sin(a*(r1-r2)/r2) + r2*p*sin(a)
    set_pixel(int(x),int(y),color(0,0,0))
    while random()>.001: a=0

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