# Tk_flippant.py

# Tk_flippant.py

from Tkinter import *

import math, random, time

rndi = random.randint
print

ww = 1200
hh = 600

center = ww/2, hh/2

c = Canvas(width=ww, height=hh, bg='white')
c.pack()

outer = [(x,0) for x in range(ww)]+[(ww,y) for y in range(hh)]+[(x,hh) for x in range(ww)[::-1]]+[(0,y) for y in range(hh)[::-1]]
outerL = len(outer)-1

speed = []
for z in range(-200,200):
    t = int(z*0.1)
    if t:
        speed += [t]
speed += speed[1:-1][::-1]
speedL = len(speed)

i = 1
t = outerL/2
points = []
for xy in range(0,outerL,outerL/60):
    points += [(xy-((i%2)*t),rndi(0,speedL))]
    i += 1

prev = 0
while 1:
    delay = time.time()+0.05
    c.delete('all')

    polygon = []
    for i,zzz in enumerate(points):
        xy, sp = zzz
        sp += rndi(1,3)
        sp %= speedL
        xy += speed[sp]
        xy %= outerL

        polygon += [outer[int(xy)]]
        prev = (xy+outerL/2)%outerL
        points[i] = xy, sp
    c.create_polygon(polygon, fill='black', outline='white', width=10)
    while delay > time.time():
        c.update()