如何在Matplotlib中用Python实现底图投影的圆滑

import matplotlib.pyplot as plt
import cartopy.crs as ccrs
import cartopy.feature as cfeature

projection = ccrs.PlateCarree()

fig, ax = plt.subplots(subplot_kw={'projection': projection})

ax.add_feature(cfeature.LAND, edgecolor='black')
ax.add_feature(cfeature.OCEAN, edgecolor='black')
ax.add_feature(cfeature.COASTLINE, edgecolor='black')
ax.add_feature(cfeature.BORDERS, edgecolor='black')

ax.set_extent([xmin, xmax, ymin, ymax], crs=projection)

# 添加数据的代码

ax.set_title('Title')
ax.set_xlabel('X Label')
ax.set_ylabel('Y Label')

plt.show()