如何用python画一个Koch snowflake Python画koch曲线如何填充颜色

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from turtle import *def snowflake(lengthSide, levels): if levels == 0: forward(lengthSide) return lengthSide /= 3.0 snowflake(lengthSide, levels-1) left(60) snowflake(lengthSide, levels-1) right(120) snowflake(lengthSide, levels-1) left(60) snowflake(lengthSide, levels-1)def full_snowflake(lengthside, levels): for i in range(3): snowflake(lengthside, levels) right(120)if __name__ == "__main__": speed(0) length = 300.0 begin_fill() fillcolor('green') penup() backward(length/2.0) pendown() full_snowflake(length, 4) begin_fill() end_fill()

可以这样做：
生成转角序列，然后转换为像素坐标。最后用python的PIL模块画图，保存为"koch.bmp"并显示图形。概念性代码：

#!/usr/bin/env python
#coding:utf-8
from PIL import Image, ImageDraw
from math import sin, cos, pi

def genRaList(raListIn, n):
raListOut = raListIn
for i in range(n):
raListOut = []
for ra in raListIn:
raListOut.extend([ra, -60, 120, -60])
raListIn = raListOut
return raListOut

def raToPoints(xy, l, raList, n):
degreeToRadian = pi/180
angleDegree = 0
r = l*(3**(-n))
x,y = xy
pt = [(x,y)]
for ra in raList:
angleDegree += ra
angleRadian = angleDegree*degreeToRadian
x += r*cos(angleRadian)
y += -r*sin(angleRadian)
pt.append((x,y))
return pt

def drawKoch(xy, l, size, raList0, n):
raList = genRaList(raList0, n)
points = raToPoints(xy, l, raList, n)
im = Image.new('1', size, 'white')
draw = ImageDraw.Draw(im)
draw.polygon(points, fill=None, outline='black')
im.save('koch.bmp')
im.show()

if __name__ == '__main__':
raList0 = [240, 120, 120]
drawKoch((207, 34), 300, (415, 415), raList0, 5)

再具体些。
Koch snowflake不知道是什么意思。画在图片上还是画在canvas上。是自动画出来，还是手工画？

感觉象是分形，或者是数学的一种图案。如果是分形，python的源代码可以直接搜索到。

这个你自己画画咯，不是很难的，自己小心计算角度和每次移动的距离就够了，写几个出来你就懂了，不难的

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