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Use the default zorder of LineCollections for county polycollections. #340

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Use the default zorder of LineCollections for county polycollections. #340

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17 changes: 13 additions & 4 deletions lib/mpl_toolkits/basemap/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1960,23 +1960,32 @@ def drawcounties(self,linewidth=0.1,linestyle='solid',color='k',antialiased=1,
ax axes instance (overrides default axes instance)
zorder sets the zorder for the county boundaries (if not
specified, uses default zorder for
matplotlib.patches.LineCollections).
`matplotlib.patches.LineCollections`).
============== ====================================================

returns a matplotlib.patches.LineCollection object.
returns a matplotlib.collections.PolyCollection object.

.. note::
Returning a `PolyCollection` for this method deviates from
other functions like :func:`drawstates` which return
`LineCollection` objects. However, to ensure that counties
will typically appear in front, the default zorder of
`LineCollection` is used as the default here.

"""
ax = ax or self._check_ax()
gis_file = os.path.join(basemap_datadir,'UScounties')
county_info = self.readshapefile(gis_file,'counties',\
default_encoding='latin-1',drawbounds=drawbounds)
counties = [coords for coords in self.counties]
counties = PolyCollection(counties)
# Hard-coding a default zorder to keep counties in front
counties = PolyCollection(counties, zorder=2)
counties.set_linestyle(linestyle)
counties.set_linewidth(linewidth)
counties.set_edgecolor(color)
counties.set_facecolor(facecolor)
counties.set_label('counties')
if zorder:
if zorder is not None:
counties.set_zorder(zorder)
ax.add_collection(counties)
return counties
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