def __init__(self, ps, color=None):
Shape.__init__(self, color)
mn = min(enumerate(ps), key=lambda (i,v): (v.y, v.x))[0]
self.vs = list(ps[mn:]) + list(ps[:mn])
self.bound = Vector.union(*self.vs)
self.half_planes = []
for i in xrange(len(self.vs)):
h = HalfPlane(self.vs[i], self.vs[(i+1) % len(self.vs)])
self.half_planes.append(h)
def __init__(self, a=1.0, b=1.0, c=0.0, d=0.0, e=0.0, f=-1.0, color=None):
Shape.__init__(self, color)
self.a = a
self.b = b
self.c = c
self.d = d
self.e = e
self.f = f
t = Transform(2 * a, c, 0, c, 2 * b, 0)
self.center = t.inverse() * Vector(-d, -e)
l1, l0 = quadratic(1, 2 * (-a - b), 4 * a * b - c * c)
v = t.eigv()
axes = [v[0] * ((l0 / 2) ** -0.5), v[1] * ((l1 / 2) ** -0.5)]
self.bound = Vector.union(self.center - axes[0] - axes[1],
self.center - axes[0] + axes[1],
self.center + axes[0] - axes[1],
self.center + axes[0] + axes[1])
