围绕一个点绘制/绘制一个具有一定半径的圆（matplotlib）

Question

I use scatter to plot some points. For example:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig, ax = plt.subplots()
ax.scatter([1,2, 1.5], [2, 1, 1.5])
plt.show()

Now I also want a circle with radius 0.5 around point [1.5, 1.5] in the plot. How do I do that? I know that there are edgecolors, so that I could just set them to 'none' and then to some color. But those circles then have no radius of 0.5.

Answer 1

To make a circle around point, you can use plt.Circle as shown below:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
fig, ax = plt.subplots()
ax.scatter([1,2, 1.5], [2, 1, 1.5])
cir = plt.Circle((1.5, 1.5), 0.07, color='r',fill=False)
ax.set_aspect('equal', adjustable='datalim')
ax.add_patch(cir)
plt.show()

I hope this solved your problem. And please let me know further.