llcrnrlon vs llcrnrx [-180, 180 vs 0, 360]

I was playing with the projections and it took me a while to understand what's going on... I need the 'rotpole' projection to convert some locations and plot some graphs. I have all the information: lon_0 = 10, o_lon_p = 10, o_lat_p = 10, but I don't have the real lat/lon, I have the rotated one so I'm forced to use llcrnrx, llcrnry....

I have a climate model that gives me the output in this rotated pole projection with rotated left lon = -19.5, rotated right lon = 21, rotated bottom lat = -25, rotated top lat = 20.5.

First take:

import mpl_toolkits.basemap as mb
kwargs = {
    'projection': 'rotpole',
    'llcrnrx': -19.5,
    'llcrnry': -25,
    'urcrnrx': 21,
    'urcrnry': 20.5,
    'o_lon_p': 10,
    'o_lat_p': 32.5,
    'lat_0': 10
}
m = mb.Basemap(**kwargs)

Now m.drawcoastlines() will give me a huge map that goes backwards on X axis... After a full day of investigation... I saw that m.llcrnrx' takes the value of360-19.5 = 340.5andm.urcrnrx = 21` so this clearly dosn't work...

Is this behaviour wanted? I mean, when building m = mb.Basemap(...) using llcrnrlon, llcrnrlat... you can safely pass negative values to llcrnrlon but when using llcrnrx you're forced to use (0, 360)...

Working version is:

import mpl_toolkits.basemap as mb
kwargs = {
    'projection': 'rotpole',
    'llcrnrx': 0,
    'llcrnry': -25,
    'urcrnrx': 21,
    'urcrnry': 40.5,
    'o_lon_p': 10,
    'o_lat_p': 32.5,
    'lat_0': -9.5
}
m = mb.Basemap(**kwargs)

So now I'm forced to do:

# x, y taken from climate model
xoffset = 19.5
lon, lat = m([x + xoffset], [y], inverse=True)

Even more confusing is the fact that you can use negative values in convert as in m(-1, 0, inverse=True) and you get the correct negative real longitude value...

Edit: using version 1.0.7; fixed 'urcrnry' misspell

Beginne damit, die bereitgestellten Beispiele für den Basemap-Konstruktor und die inverse Konvertierung mit den gemeldeten Koordinaten des gedrehten Pols zu reproduzieren. Untersuche, wie der Basemap-Einstiegspunkt die Bereiche llcrnrx und urcrnrx verarbeitet, ermittle dann das erwartete Koordinatenverhalten und füge eine Abdeckung für den Fall eines negativen gedrehten Längengrads hinzu. Die Aufgabe ist abgeschlossen, wenn der dokumentierte Koordinatenbereich und die resultierende Kartenausrichtung konsistent sind.