# Tk_sq_combos.py

# Tk_sq_combos.py -- just an experiment

from Tkinter import *

# Number of squares in x and y dimensions.
nx = 80
ny = 80

# Size of square side in pixels.
ss = 5

# Total dimensions of display.
ww = nx * ss
hh = ny * ss

root = Tk()
root.geometry("%sx%s+0+0" % (ww, hh))
c = Canvas(root, width=ww, height=hh)
c.pack()

COLORS = 'blue purple black gray white '.split()
val = 'qwertyuiopasdfghjklzxcvbnm1234567890'

from itertools import combinations

combos = [p for p in combinations(COLORS*3, 7)]

def make_square(x, y, color):
    return c.create_rectangle(x * ss, y * ss, (x+1) * ss, (y+1) * ss,
                              fill=color, outline=color)

def make_squares():
    squares = []
    for x in range(nx):
        squares.append([])
        for y in range(ny):
            squares[x].append(make_square(x, y, 'white'))
    return squares

squares = make_squares()

done = False
def quit_handler(event):
    global done
    done = True

# Left mouse button click on canvas terminates the program.
root.bind('<Button-1>', quit_handler)

ppp = []
while not done:
    sss = ''
    for x in range(len(squares)):
        for y in range(len(squares[x])):
            h = squares[x][y]
            t = -11
            while 1:
                if not ppp:
                    ppp = list(combos.pop(0))+COLORS
                    combos.append(ppp[:])
                    t -= 1
                p = ppp.pop()
                s = val[COLORS.index(p)]
                if sss[t:]+s not in sss:
                    break
            sss += s
            sss = sss[-ww*hh:]
            color = p
            c.itemconfig(h, fill=color, outline=color)
    combos = combos + [combos.pop(9),combos.pop(7),combos.pop(3),combos.pop(0)]
    root.update()