雪花python

import turtle
import math

# 设置画布和画笔
window = turtle.Screen()
window.bgcolor("black")
pen = turtle.Turtle()
pen.speed(0)  # 最快速度
pen.color("cyan")
pen.penup()

# 计算初始位置，让图形居中
size = 300
height = size * math.sqrt(3) / 2
pen.goto(-size / 2, -height / 3) # 将起始点调整到画布中央偏下
pen.pendown()

# 定义科赫曲线的递归函数
def koch_curve(t, size, depth):
    if depth == 0:
        t.forward(size)
    else:
        for angle in [60, -120, 60, 0]:
            koch_curve(t, size / 3, depth - 1)
            t.left(angle)

# 绘制雪花的三个边
depth = 4 # 递归深度，控制图案的复杂程度，数字越大越精细
for _ in range(3):
    koch_curve(pen, size, depth)
    pen.right(120)

# 完成并隐藏画笔
pen.hideturtle()
turtle.done()