# Tk_Gradient_Scatter.py
 
from Tkinter import *
from PIL import Image, ImageTk
import random
import math
import time
 
ww = 640
hh = 640
root = Tk()
root.title("Tk Gradient Scatter")
root.geometry("%dx%d+0+0"%(ww,hh))
canvas = Canvas(root, width=ww, height=hh)
canvas.grid()

RGBs = []
def z():
    RGBs.append((r,g,b))
r,g,b = 255,0,0
for g in range(256):
    z()
for r in range(254, -1, -1):
    z()
for b in range(256):
    z()
for g in range(254, -1, -1):
    z()
for r in range(256):
    z()
for b in range(254, -1, -1):
    z()

Lc = len(RGBs)

img = Image.new("RGB",(ww,hh), "white")

while 1:
	pix = []
	inc = 0.002
	yoff = 0
	for x in range(ww):
		xoff = 0
		for y in range(hh):
			rgb = int(random.uniform(xoff, yoff)*Lc)
			# rgb = int((xoff+yoff)/2*Lc) 
			pix.append(RGBs[rgb%Lc])
			xoff += inc
		yoff += inc

	img.putdata(pix)
	imgTk = ImageTk.PhotoImage(img)
	canvas.create_image(0, 0, anchor=NW, image=imgTk)
	root.update()