# tk_flippant_lines.py

# tk_flippant_lines.py

import tkinter as tk

w, h = 240, 136
speed_multiplier = 0.5
num_speeds = 30
speeds = [speed_multiplier * (0.5 + i / (num_speeds - 1) * 4.0) for i in range(num_speeds)]

l = [[w//15*j, speeds[i%num_speeds], w//15*j, speeds[(i+1)%num_speeds]] for i, j in enumerate(range(15))]
c = ['#000', '#1D2B53', '#7E2553', '#008751', '#AB5236', '#5F574F', '#C2C3C7', '#FFF1E8', '#F00', '#FA0', '#FF0', '#0F0', '#0AF', '#83769C', '#F7A', '#FCA']

rr = tk.Tk()
cv = tk.Canvas(rr, width=w, height=h, bg='black')
cv.pack()

while 1:
    cv.delete("all")
    for a, b in enumerate(l):
        for i in (0, 2):
            b[i] += b[i+1]
            if b[i] < 0 or b[i] > w: b[i+1] *= -1
        cv.create_line(b[0], 0, b[2], h, width=3, fill=c[(a + 1) % 16])
    cv.update()
    rr.update_idletasks()