BUG: gridliner vs dateline

[bblay]

Using the gridliner across the dateline, it fails in one of two ways. Either the labels aren't printed beyond dateline, or the lines don't join up across the dateline.

import matplotlib.pyplot as plt
import matplotlib.ticker as mticker
import cartopy.crs as ccrs
from cartopy.mpl.gridliner import LONGITUDE_FORMATTER, LATITUDE_FORMATTER


def plot_common(subp, title):
    ax = plt.subplot(subp, projection=ccrs.PlateCarree(central_longitude=141.0))
    ax.set_extent([100, 205, 15, 50])
    ax.coastlines()

    gl = ax.gridlines(draw_labels=True, linewidth=0.5, alpha=0.7)
    gl.top_labels = False
    gl.right_labels = False

    gl.ylocator = mticker.FixedLocator([10,30,50,70,90])
    gl.xformatter = LONGITUDE_FORMATTER
    gl.yformatter = LATITUDE_FORMATTER

    pc = ccrs.PlateCarree()
    sf = plt.plot(141.0329,37.4206,'r*',markersize=10,transform=pc)
    st = plt.text(141.1329,37.4206,'Fukushima \n Dai-ichi NPP',verticalalignment='top',transform=pc)

    plt.title(title)

    return gl


# broken ticks
gl = plot_common(211, 'broken ticks')
gl.xlocator = mticker.FixedLocator([100,120,140,160,180,200,220])


# broken lines
gl = plot_common(212, 'broken lines')
gl.xlocator = mticker.FixedLocator([100,120,140,160,180,-160,-140])


plt.show()

[acrosby]

Is this still unfixed?

[pelson]

Still unfixed on master (v0.17 just released).

[greglucas]

The gridlines now continue through the dateline on master. However, the ticks still don't wrap properly.

[QuLogic]

The default CRS for GeoAxes.gridlines is PlateCarree, not the map CRS, so longitudes > 180 do not exist. But if we pass the map CRS, then the central longitude becomes 0, which is also not what we want. I guess gridlines should do some sort of wrapping, but it should only be a special case, maybe just for PlateCarree or geodetic CRSs? Or maybe this is another case for LatLong #1164.