Python fractal et turtle

Résultat

Script

import turtle
MINIMUM_BRANCH_LENGTH = 5
def build_tree(t, branch_length, shorten_by, angle):
  if branch_length > MINIMUM_BRANCH_LENGTH:
    t.forward(branch_length)
    new_length = branch_length - shorten_by
    t.left(angle)
    build_tree(t, new_length, shorten_by, angle)
    t.right(angle * 2)
    build_tree(t, new_length, shorten_by, angle)
    t.left(angle)
    t.backward(branch_length)
tree = turtle.Turtle()
tree.hideturtle()
tree.setheading(90)
tree.color('green')
build_tree(tree, 50, 5, 30)
turtle.mainloop()

Résultat

Script

import turtle

def koch_curve(t, iterations, length, shortening_factor, angle):

  if iterations == 0:

    t.forward(length)

  else:

    iterations = iterations - 1

    length = length / shortening_factor

    koch_curve(t, iterations, length, shortening_factor, angle)

    t.left(angle)

    koch_curve(t, iterations, length, shortening_factor, angle)

    t.right(angle * 2)

    koch_curve(t, iterations, length, shortening_factor, angle)

    t.left(angle)

    koch_curve(t, iterations, length, shortening_factor, angle)

t = turtle.Turtle()

t.hideturtle()

for i in range(3):

  koch_curve(t, 4, 200, 3, 60)

  t.right(120)

turtle.mainloop()