# Tk_central_pop_art.py

# Tk_central_pop_art.py

from math import cos,sin,pi,radians
import random

r=random.randint

try:
    import tkinter as tk
except:
    import Tkinter as tk

root=tk.Tk()
root.title("Tk Central Pop Art")

ww=640
hh=640

mid=(ww+hh)/4

canvas=tk.Canvas(root,width=ww,height=hh)
canvas.pack(fill="both",expand=True)


class Cv(): 0
cv=Cv()
cv.color=''
COLORS = 'red darkorange yellow green blue purple'.split()
cv.x=0
cv.y=0
cv.a=1
cv.b=1
cv.a2=1
cv.b2=1
cv.o360=360
cv.angle2=0
cv.start=0
cv.count=0

STEP=25

def mark():
    a=cv.a*STEP
    b=a+(cv.b*STEP)
    c=360.0/cv.o360
    angle = cv.start
    for null in range(0,360,int(c)):
        angle += c
        angle = angle%360
        x0=cv.x+cos(radians(angle))*a
        y0=cv.y+sin(radians(angle))*a

        x1=cv.x+cos(radians(angle))*b
        y1=cv.y+sin(radians(angle))*b

        canvas.create_line(x0,y0,x1,y1,width=5,fill=cv.color)

def tick():
    #canvas.delete(tk.ALL)
    c2s = r(5,60)
    cv.x,cv.y=[r(0,640) for z in 'zz']
    cv.b=r(1,15)
    cv.a=r(1,16-cv.b)
    cv.angle2=r(0,360)
    cv.start=r(0,360)
    cv.o360=c2s
    try:
        cv.color=cv.colors2.pop()
    except:
        cv.colors2 = COLORS[:]
        cv.color=cv.colors2.pop()
    mark()
    canvas.after(1,tick)

tick()

tk.mainloop()