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Properly document behavior of set_extent #1729

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Properly document behavior of set_extent #1729

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15 changes: 13 additions & 2 deletions lib/cartopy/mpl/geoaxes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -822,8 +822,19 @@ def set_extent(self, extents, crs=None):
Set the extent (x0, x1, y0, y1) of the map in the given
coordinate system.

If no crs is given, the extents' coordinate system will be assumed
to be the Geodetic version of this axes' projection.
set_extent has a complex behavior.

1) if no CRS is given, the map projection is Plate Carree, and the
extent given is [-180, 180, -90, 90], the globe will be plotted.
2) if no CRS is given, the extent must be in longitudes and latitudes.
A Geodetic CRS with Globe parameters inherited from the map projection
will be used to transform the extent into map projection units. The
bounds of the transformed geometry will be set as the extents of the
map. Thus no CRS with a Plate Carree projection and extent = [-179,
179, -89, 89] will plot [-180, 180, -89, 89].
3) if a CRS is given it will be used to transform the extent into map
projection units. The bounds of the transformed geometry will be set
as the extent of the map.

Parameters
----------
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