# (C) GEATEC engineering, license: Creative Commons
# Inspired by our cat Pietje

from turtle import *
from random import *

speed (0)

colors = ('gray', 'green', 'red', 'white', 'blue', 'yellow')
delta = 8
threshold = 100
color ('black', 'black')

def maybe (bias = None):
    return choice ([False, True, bias, bias] if bias != None else [False, True])    

def between (a, b):
    return a + (0.2 + 0.3 * random ()) * (b - a)

recentColors = ['black', 'black']
def originalColor ():
    global recentColors
    while True:
        result = choice (colors)
        if result == 'white' or not result in recentColors:
            recentColors = [result, recentColors [0]]
            print (result, end = ' ')
            return result
    
def rect (xMin, yMin, xMax, yMax):
    for aColor in ('black', originalColor ()):
        color (aColor, aColor)
        
        up ()
        goto (xMin, yMin)
        down ()
        
        begin_fill ()
        goto (xMax, yMin)
        goto (xMax, yMax)
        goto (xMin, yMax)
        goto (xMin, yMin)
        end_fill ()
        
        xMin += delta
        yMin += delta
        xMax -= delta
        yMax -= delta
    
def draw (xMin = -250, yMin = -300, xMax = 250, yMax = 300):
    if xMax - xMin > threshold and yMax - yMin > threshold:
        if maybe (xMax - xMin > yMax - yMin):
            xMid = between (xMin, xMax)
            if maybe ():
                draw (xMin, yMin, xMid, yMax)
                rect (xMid, yMin, xMax, yMax)
            else:
                rect (xMin, yMin, xMid, yMax)
                draw (xMid, yMin, xMax, yMax)
        else:
            yMid = between (yMin, yMax)
            if maybe ():
                draw (xMin, yMin, xMax, yMid)
                rect (xMin, yMid, xMax, yMax)
            else:
                rect (xMin, yMin, xMax, yMid)
                draw (xMin, yMid, xMax, yMax)
    else:
        rect (xMin, yMin, xMax, yMax)
        ontimer (lambda: (print (), clear (), draw ()), 2000)
draw ()
done ()