Random fractal curve (Python recipe) by FB36

ActiveState Code (http://code.activestate.com/recipes/577783/)

# Random fractal curve
# FB - 201107096
import math
import random
from PIL import Image
imgx = 300
imgy = 600
image = Image.new("RGB", (imgx, imgy))
c = random.random()

def frCurve(xa, ya, xb, yb):
    dx = xb - xa
    dy = yb - ya
    d = math.hypot(dx, dy)
    if d <= 1:
        if xa >= 0 and xa < imgx and ya >=0 and ya < imgy:
            image.putpixel((xa, ya), (0, 255, 0))
        if xb >= 0 and xb < imgx and yb >=0 and yb < imgy:
            image.putpixel((xb, yb), (0, 255, 0))
        return
    xm = xa + dx * c
    ym = ya + dy * c + math.copysign(dx * c, random.random() - 0.5)
    frCurve(xa, ya, xm, ym)
    frCurve(xm, ym, xb, yb)

# main
frCurve(0, (imgy - 1) / 2, imgx - 1, (imgy - 1) / 2)
image.save("Random_Fractal_Curve.png", "PNG")