# Tk_radial_sparse.py

# Tk_radial_sparse.py

import math

from tkinter import *

ww = 600
hh = 600

root = Tk()
root.title("Tk_radial_sparse")
root.geometry("%dx%d+-10+0"%(ww,hh))
canvas = Canvas(root, width=ww, height=hh)
canvas.pack()

xy = []
PI = math.pi
ww0 = ww/2
hh0 = hh/2

for r in range(1,500,5):
    circumference = (r * 2 * PI) / ((r + 200.0) / 50)
    if not circumference:
        circumference = 1
    for degrees in range(0,360,int(360.0/circumference)):
        angle = math.radians(degrees)
        x = int(r * math.cos(angle))+ww0
        y = int(r * math.sin(angle))+hh0
        if 0 < x < ww-3 and 0 < y < hh-3:
            xy.append((x,y))
            canvas.create_oval(x,y,x+3,y+3, fill="purple", outline="")
canvas.update()

root.mainloop()