Python 和 Matplotlib : how to plot ellipse?

Question

我可以像这样绘制椭圆:

from matplotlib.patches import Ellipse
import matplotlib as mpl
%matplotlib inline
from matplotlib import pyplot as plt

mean = [ 19.92977907 ,  5.07380955]
width = 30
height = 1.01828848
angle = -54
ell = mpl.patches.Ellipse(xy=mean, width=width, height=height, angle = 180+angle)
fig, ax = plt.subplots()
ax.add_artist(ell)

ax.set_aspect('equal')
ax.set_xlim(-100, 100)
ax.set_ylim(-100, 100)
plt.show()

但是，这需要我手动设置轴数据限制。可以自动设置吗？我的意思是，如何摆脱 ax.set_xlim(-100, 100) 和 ax.set_ylim(-100, 100) ？ 或者，绘制椭圆的好方法是什么？

Answer 1

您需要使用add_patch而不是add_artist添加patch，然后数据限制将使用ax正确更新。自动缩放:

from matplotlib.patches import Ellipse
import matplotlib as mpl
%matplotlib inline
from matplotlib import pyplot as plt

mean = [ 19.92977907 ,  5.07380955]
width = 30
height = 1.01828848
angle = -54
ell = mpl.patches.Ellipse(xy=mean, width=width, height=height, angle = 180+angle)
fig, ax = plt.subplots()

ax.add_patch(ell)
ax.set_aspect('equal')
ax.autoscale()
plt.show()