#http://www.mathcurve.com/courbes2d/cassini/cassini.shtml
vertices = 1000

t = from (-PI) to (PI)
a = 10
b = rand2(0, 4*a)
e = b/a;

p = a*sqrt(cos(2*t) + sqrt(e^4 - sin(2*t)^2))

x = p*cos(t)
y = p*sin(t)
