f = 6 (slider from 0 to 6, step 0.1)
A: -((f, 0.0))
B: (f, 0.0)
r = 0.3 (slider from 0.3 to 6, step 0.2)
C: (r * r, 2.0 * r)
c = Ellipse(A, B, C)
d = Hyperbola(A, B, C)