y-labels not visible when x-axis inverted #1606
Description
Description
It is conventional in astronomy for the longitude coordinate to be inverted such that it increases to the left. Basemap had the handy celestial keyword argument that could be used to invert the direction of increasing longitude (see here). With cartopy, I've been explicitly inverting the x-axis using Axes.invert_xaxis. This seems to work pretty well for most cases; however, the y-axis labels are not longer drawn when the x-axis is inverted. I'm guessing this could have something to do with how the Gridliner determines which labels are visible based on the axes domain:
cartopy/lib/cartopy/mpl/gridliner.py
Line 825 in 4703efc
I haven't tracked down exactly where the problem is yet, but it should be possible to correct with a judicious use of Axes.xaxis_inverted. Below I've added some code demonstrating the issue.
Code to reproduce
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
fig = plt.figure(figsize=(12, 5))
ax1 = fig.add_subplot(1, 2, 1, projection=ccrs.PlateCarree())
ax1.set_title("Regular")
ax1.plot([1,15],[1,15],'-o',transform=ccrs.PlateCarree())
gl = ax1.gridlines(draw_labels=True)
ax2 = fig.add_subplot(1, 2, 2, projection=ccrs.PlateCarree())
ax2.set_title("Inverted")
ax2.plot([1,15],[1,15],'-o',transform=ccrs.PlateCarree())
ax2.invert_xaxis()
gl = ax2.gridlines(draw_labels=True)
plt.savefig('fig1.png')
Traceback
Full environment definition
Operating system
Mac OS X
Cartopy version
v0.18.0
conda list
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pip list