[视频]用DOL系统绘制分形（python3.6）

方法/步骤

安装fractal模块。

pip install fractal

打开python安装目录里面的lib\site-packages\fractal文件夹里面的base.py文件，把第45行的内容改为：

……

pygame.quit()

sys.exit()

……

然后新建py文件，运行如下代码：

from fractal import Pen

p = Pen([500, 300], title="Koch")

p.setPoint([5, 190])

p.doD0L(omega="f", P={"f": "f+f--f+f"},

delta=60, times=5, length=490, rate=3)

p = Pen([500, 500], title="Window")

p.setPoint([100, 495])

p.doD0L(omega="f+f+f+f+f", P={"f": "ff+f--f+f"},

delta=72, times=3, length=490, rate=4.3)

p.save('0.png')

p.wait()

p = Pen([500, 500], title="Window")

p.setPoint([100, 495])

p.doD0L(omega="f+f+f+f+f", P={"f": "ff+f--f+f"},

delta=72, times=5, length=490, rate=4)

p.save('0.png')

p.wait()

from fractal import IFS

from random import random

def ifsp(x, y):

p = random()

if p < 0.01:

return (0, 0.16 * y)

elif p < 0.07:

if random() > 0.5:

return (0.21 * x - 0.25 * y, 0.25 * x + 0.21 * y + 0.44)

else:

return (-0.2 * x + 0.26 * y, 0.23 * x + 0.22 * y + 0.6)

else:

return (0.85 * x + 0.1 * y, -0.05 * x + 0.85 * y + 0.6)

ob = IFS([400, 500], title = "Leaf")

ob.setPx(100, 100, 100)

ob.setIfsp(ifsp)

ob.doIFS(200000)

ob.wait()

from fractal import Pen

p = Pen([500, 365])

p.setPoint([400, 200])

p.setWidth(1)

p.doD0L(omega="L", P={"L": "L+R", "R": "L-R"},

delta=90, times=20, length=900, rate=1.5)

p.save('0.png')

p.wait()