---
title: Python Turtle 畫雪花 (Snow Crystal, Snowflake)
tags: Python Turtle
---
# Python turtle 畫雪花 (Snow Crystal, Snowflake)
By 蓉爸
Created: 2020-01-08
Revised: 2022-07-29

在 FB 上看到這一篇 [Python turtle畫雪花](https://liferecordbyys.blogspot.com/2020/01/python-turtle.html)，好奇跟著試了一下，結果不行，經過除錯，可以執行了，成果像這樣：


## Desktop 版程式碼如下：
OS: Win7
Python: 3.7.4

import turtle as tu
#from turtle import*
tu.bgcolor("#FFF0F5")
tu.speed(0) 
tu.colormode(255)
def branch():
    for i in range(3):
        for i in range(3):
            tu.forward(10)
            tu.backward(10)
            tu.right(45)
        tu.left(90)
        tu.backward(15)
        tu.left(45)
    tu.right(90)
    tu.forward(45)
    
for b in range(7):
    for c in range(6):
        x=-400+c*250
        y=350-b*120
        tu.penup() #提筆
        tu.setposition(x,y) #確認座標
        tu.pendown() #下筆
        tu.begin_fill()
        if b%2==0:
            tu.color(88,76,208)
        elif b%3==0:
            tu.color(83,217,255)
        else:
            tu.color(168,216,255)
        for i in range(8):
                branch()
                tu.left(45)
        tu.end_fill()

tu.hideturtle()
done()  

## Colab 版程式碼如下：


# 安裝 ColabTurtle 模組
! pip3 install ColabTurtle 
# 匯入 ColabTurtle 模組
from ColabTurtle.Turtle import * 
# 呼叫 initializeTurtle() 函數，來初始化 Turtle
initializeTurtle ()

# 呼叫 initializeTurtle() 函數，來初始化 Turtle
initializeTurtle ()

# 設定背景顏色
bgcolor('black')   # bgcolor ('white', 'yellow', 'orange', 'red', 'green', 'blue', 'purple', 'grey', 'black')

# 設定繪圖速度
# speed should be an integer in the interval [1,10]
speed(10) 

# 設定線條寬度
width(1)

# 設定線條顏色
color('blue')     # color ('white', 'yellow', 'orange', 'red', 'green', 'blue', 'purple', 'grey', 'black')

# ------------------------------------
# 定義 branch 函數
def branch():
    for i in range(3):
        for i in range(3):
            forward(10)
            backward(10)
            right(45)
        left(90)
        backward(15)
        left(45)
    right(90)
    forward(45)

# ------------------------------------
#
# 繪圖主程式: 開始畫雪花
#

ora_x=100
ora_y=40
offset_x=130
offset_y=60
max_b = 4 # max row
max_c = 3 # max column

for b in range(max_b):
    for c in range(max_c):
        #x=-400+c*250
        #y=350-b*120
        x=ora_x+c*offset_x
        y=ora_y+b*offset_x
        penup() #提筆
        #setposition(x,y) #確認座標
        setx(x)
        sety(y)
        pendown() #下筆
        #begin_fill()
        if b%2==0:
            #color(88,76,208)
            color('white')
        elif b%3==0:
            #color(83,217,255)
            color('yellow')
        else:
            #color(168,216,255)
            color('orange')
        for i in range(8):
                branch()
                left(45)
        #end_fill()

hideturtle()