round = 500.0;
def setup():
  size(1000, 1000)

def xy(i):
    global round
    dist = float(i * 2);
    angle = (i/((float(round)+500)))*360
    
    x = cos(angle)*dist;
    y = sin(angle)*dist;
    return (width/2+x,height/2+y)

def draw():
  global round
  background(200)
  round = (round + 1) % 500
  for i in range(500):
    (x,y) = xy(i)
    #ellipse(width/2+x, height/2+ y, 80, 80);
    
    if i % 1 == 0:
        (x1,y1) = xy(i-10)
        (x2,y2) = xy(i)
        (x3,y3) = xy(i+10)
        line(x1,y1,x2,y2)
        line(x2,y2,x3,y3)
        line(x3,y3,x1,y1)