Simple IFS

# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

class IFSTree(object):
    def __init__(self):
        self.x = [0.4545]
    self.y = [0.0001]
    def __rule1__(self):
    y = self.y[-1]
    self.x.append(0)
    self.y.append(y*0.16)
    def __rule2__(self):
        x = self.x[-1]
    y = self.y[-1]
    self.x.append(-0.85*x+0.04*y)
    self.y.append(-0.04*x+0.85*y+1.6)
    def __rule3__(self):
        x = self.x[-1]
    y = self.y[-1]
    self.x.append(0.2*x-0.26*y)
    self.y.append(0.23*x+0.22*y+1.6)
    def __rule4__(self):
        x = self.x[-1]
    y = self.y[-1]
    self.x.append(-0.15*x+0.28*y)
    self.y.append(0.26*x+0.24*y+0.44)
    def generate(self,iter):
        i,func = 1,[self.__rule1__,self.__rule2__,self.__rule3__,self.__rule4__]
    while i <= iter:
        import random
        func[random.randrange(0,3)]()
            i+=1
    def graph(self):
        plt.plot(self.x,self.y,'go')
    plt.show()


z = IFSTree()
z.generate(250000) # number of iteration
z.graph()