问消除python matplotlib中某些限制之外的圆的一部分？

EN

import matplotlib.pyplot as plt
import mpl_toolkits.mplot3d.art3d as art3d  # noqa: F401 unused import

def get_circle(x, r, n=360):
    q = np.linspace(start=-np.pi, stop=np.pi, num=n)

    c = np.empty((n, len(x)))
    c[:, 0] = np.cos(q)*r + x[0]
    c[:, 1] = np.sin(q)*r + x[1]
    if len(x) == 3:
        c[:, 2] = x[2]

    return c

def cut_circle(c, limits):
    idx_keep_x = np.logical_and(limits[0, 0] < c[:, 0], c[:, 0] < limits[0, 1])
    idx_keep_y = np.logical_and(limits[1, 0] < c[:, 1], c[:, 1] < limits[1, 1])
    idx_keep = np.logical_and(idx_keep_x, idx_keep_y)

    c2 = c[idx_keep, :]

    c2_help = np.concatenate([c2, c2[:1, :]])
    i_jump = np.argmax(np.linalg.norm(np.diff(c2_help[:, :2], axis=0), axis=-1))

    c3 = np.roll(c2, -(i_jump+1), axis=0)

    return c2, c3


limits = np.array([[20, 50],
                   [30, 60],
                   [0, 20]])

c1 = get_circle(x=[45, 55, 5], r=10)
c2, c3 = cut_circle(c=c1, limits=limits)

c2[:,  2] += 5
c3[:, 2] += 10


fig = plt.figure()
ax = fig.gca(projection='3d')

ax.set_xlim(limits[0])
ax.set_ylim(limits[1])
ax.set_zlim(limits[2])

ax.plot(*c1.T)
ax.plot(*c2.T)
ax.plot(*c3.T)