n = 2.5
a = 200
b = 200
linewidth 0.2
while t <= 360
   x = pow abs cos t (2 / n) * a * sign cos t
   y = pow abs sin t (2 / n) * b * sign sin t
   line x / 5 + 50 y / 5 + 50
   t += 0.5
.