Python海龟绘图-藤蔓

import time
import turtle as t
from turtle import *
t.setup(1280,720)
t.speed(0)
t.pensize(1)
length = 6
path = 'F'
angle = 27
up()
color("#262626;")
goto(-600, -350)
down()
expalnation = {'F': '画线','x': '-','+': '逆时针旋转','-': '顺时针旋转','[': '记录当前位置',']': '恢复上一个位置','a': '上色','b': '上色','c': '上色'
}
rules = {'F': 'aFF[b-F++F][c+F--F]c++F--F','X': 'aFF+[b+F]+[c-F]'
}def draw_path(path, expalnation):posList, angleList = [], []t.up()t.goto(600, -350)t.down()t.lt(90)for symbol in path:if symbol == 'F':t.forward(length)elif symbol == '+':t.left(angle)elif symbol == '-':t.rt(angle)elif symbol == '[':posList.append(t.pos())angleList.append(t.heading())elif symbol == 'a':t.pensize(3)t.color("#8c503c")elif symbol == 'b':t.pensize(2)t.color("#4ab441")elif symbol == 'c':t.pensize(2)t.color("#18b418")elif symbol == ']':t.up()t.home()t.goto(posList.pop())t.left(angleList.pop())t.down()def apply_rules(path, rules):L = [_ for _ in path]for i in range(len(L)):symbol = L[i]if symbol == 'F':L[i] = rules[symbol]if symbol == 'X':L[i] = rules[symbol]path = ''.join(L)return pathfor _ in range(4):path = apply_rules(path, rules)
draw_path(path, expalnation)