数学图形(1.25)cassini曲线

通过这种曲线可以看到一种由8到0的过度

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

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

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

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

面:

vertices = D1: D2:

u = from (-PI) to (PI) D1
v = from () to () D2
a = 

p = a*sqrt(cos(*u) + sqrt(v^ - sin(*u)^))

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