matplotlib形状

一、概念
（一）生成形状，patches
（二）import matplotlib.patches as mpatches
（三）add_patch
二、实践
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
fig,ax=plt.subplots()
xy1=np.array([0.2,0.2])
xy2=np.array([0.2,0.8])
xy3=np.array([0.8,0.2])
xy4=np.array([0.8,0.8])
circle=mpatches.Circle(xy1,0.05)
ax.add_patch(circle)
rect=mpatches.Rectangle(xy2,0.2,0.1,color=‘r’)
ax.add_patch(rect)
polygon=mpatches.RegularPolygon(xy3,5,0.1,color=‘g’)
ax.add_patch(polygon)
ellipse=mpatches.Ellipse(xy4,0.4,0.2,color=‘y’)
ax.add_patch(ellipse)
plt.axis(‘equal’)
plt.grid()
plt.show()