Sierpiński箭头曲线.py

# -*- coding: utf-8 -*-
# Time    : 2019/4/5 22:16
# Author  : Mifen
# Email   : 2952277346@qq.com
# Github  : https://github.com/Amd794

from turtle import *
length = 5
angle = -60
setup(1280,720)
up()
color("#262626;")
goto(-600,300)
write('Author:Mifen',font=("微软雅黑", 18))
goto(-600,250)
write('E-mail :2952277346@qq.com',font=("微软雅黑", 18))
goto(-600, 200)
write('Code   :https://github.com/Amd794/Python123', font=("微软雅黑", 18))
goto(-640,-350)
down()
def draw_path(path):
    for symbol in path:
        if symbol == 'A' or symbol == 'B':
            import random
            colormode(255)
            color(random.randint(0,255),random.randint(0,255),random.randint(0,255))
            forward(length)
        elif symbol == '-':
            right(angle)
        elif symbol == '+':
            left(angle)
    ht()

def apply_rules(path,rules):
    lit = [_ for _ in path]
    for i in range(len(lit)):
        symbol = lit[i]
        if symbol in rules:
            lit[i] = rules[symbol]
    path = ''.join(lit)
    return path


rules = {
    'A':'B-A-B',
    'B':'A+B+A'
}
path = 'A'
speed(0)
for i in range(7):
    path = apply_rules(path,rules)
draw_path(path)
up()
goto(0,-340)
angle = 60
down()
draw_path(path)
up()
goto(0,-340)
angle = -60
down()
draw_path(path)