gistfile1.txt

#New sierpinski fractal animation:


#Code is sloppy, I'll probably clean it up later:

# coding: utf-8
from images2gif import writeGif
from PIL import Image, ImageDraw, ImageChops

import console



W, H = 1024,1024
RESOLUTION = 5
FG, BG = '#ffbb00', '#009bff'

#FG, BG = '#000000', '#ffffff'


def drange(start, stop, step=1):
    n = int(round((stop - start)/float(step)))
    if n > 1:
        return([start + step*i for i in range(n+1)])
    else:
        return([])

def irange(start, increments):
    mylist = [start]
    for i in increments:
        mylist.append(mylist[-1]+i)
    return mylist

    
class Rect:
    def __init__(self, left, top, width, height):
        self.left = left
        self.right = left + width
        self.top = top
        self.bottom = top+height

        self.centerx = left + (width/2)
        self.centery = top + (height/2)

        self.width = width
        self.height = height

        self.bbox = (left, top), (self.right, self.bottom)

def drawSierpinski(surf, rect, fgcolor=FG, bgcolor=BG, level=6, topshade=True):
    try:
        rect.left
    except AttributeError:
        left, top, width, height = rect
        rect = Rect(left, top, width, height)

    if level == 0:
        return

    quarterWidth = (rect.width/4)+rect.left
    threeQuarterWidth = (rect.width/4*3)+rect.left

    topRect = Rect(quarterWidth, rect.top, (rect.width / 2), (rect.height / 2))
    leftRect = Rect(rect.left, rect.centery, (rect.width/2), (rect.height/2))
    rightRect = Rect(rect.centerx, rect.centery, (rect.width / 2), (rect.height / 2))

    #Shade topleft
    if topshade:
        surf.rectangle((rect.left, rect.top, rect.centerx, rect.bottom), fill=bgcolor)
    #outer triangle
    surf.polygon([(rect.centerx,rect.top),(rect.left,rect.bottom),(rect.right,rect.bottom)],fgcolor)
    #inner upside-down triangle
    surf.polygon([(quarterWidth,rect.centery),(rect.centerx,rect.bottom),(threeQuarterWidth, rect.centery)],bgcolor)

    #do recursive calls
    drawSierpinski(surf, topRect, fgcolor, bgcolor, level-1, topshade)
    drawSierpinski(surf, leftRect, fgcolor, bgcolor, level-1, topshade)
    drawSierpinski(surf, rightRect, fgcolor, bgcolor, level-1, topshade)

    return im

def make_sierpinski(level, topshade=True):
    im = Image.new('RGB', (W, H), (255,255,255))
    surf = ImageDraw.Draw(im)

    drawSierpinski(surf, Rect(0, 0, W, H), FG, BG, level, topshade)
    return im




im = Image.new('RGB', (W, H), (255,255,255))
surf = ImageDraw.Draw(im)

sierpinski1 = make_sierpinski(RESOLUTION)
sierpinski2 = make_sierpinski(RESOLUTION+1)

numbers = [int(n) for n in irange(0, drange(8,4,-0.0475))]

images = []
for x in numbers:
    a = sierpinski1.crop((x, x, W, W)).resize((512, 512), Image.ANTIALIAS)
    b = sierpinski2.crop((x, x, W, W)).resize((512, 512), Image.ANTIALIAS)

    alpha = x / float(W/2)
    images.append(Image.blend(a, b, alpha))
    console.clear()
    print str(alpha*100)+'%'


console.clear()
print 'writing...'

writeGif('sierpinski.gif', images, 2.0/len(images))```