def barbs(self, x, y, u, v, *args, **kwargs):
"""
Make a wind barb plot (u, v) with on the map.
(see matplotlib.pyplot.barbs documentation).
If ``latlon`` keyword is set to True, x,y are intrepreted as
longitude and latitude in degrees. Data and longitudes are
automatically shifted to match map projection region for cylindrical
and pseudocylindrical projections, and x,y are transformed to map
projection coordinates. If ``latlon`` is False (default), x and y
are assumed to be map projection coordinates.
Extra keyword ``ax`` can be used to override the default axis instance.
Other \*args and \**kwargs passed on to matplotlib.pyplot.barbs
Returns two matplotlib.axes.Barbs instances, one for the Northern
Hemisphere and one for the Southern Hemisphere.
"""
if _matplotlib_version < '0.98.3':
msg = dedent("""
barb method requires matplotlib 0.98.3 or higher,
you have %s""" % _matplotlib_version)
raise NotImplementedError(msg)
ax, plt = self._ax_plt_from_kw(kwargs)
# allow callers to override the hold state by passing hold=True|False
b = ax.ishold()
h = kwargs.pop('hold',None)
if h is not None:
ax.hold(h)
lons, lats = self(x, y, inverse=True)
unh = ma.masked_where(lats <= 0, u)
vnh = ma.masked_where(lats <= 0, v)
ush = ma.masked_where(lats > 0, u)
vsh = ma.masked_where(lats > 0, v)
try:
retnh = ax.barbs(x,y,unh,vnh,*args,**kwargs)
kwargs['flip_barb']=True
retsh = ax.barbs(x,y,ush,vsh,*args,**kwargs)
except:
ax.hold(b)
raise
ax.hold(b)
# Because there are two collections returned in general,
# we can't set the current image...
#if plt is not None and ret.get_array() is not None:
# plt.sci(retnh)
# clip for round polar plots.
if self.round:
retnh,c = self._clipcircle(ax,retnh)
retsh,c = self._clipcircle(ax,retsh)
# set axes limits to fit map region.
self.set_axes_limits(ax=ax)
return retnh,retsh
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