__init__.py 文件源码

def streamplot(self, x, y, u, v, *args, **kwargs):
        """
        Draws streamlines of a vector flow.
        (see matplotlib.pyplot.streamplot 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.streamplot.
        """
        if _matplotlib_version < '1.2':
            msg = dedent("""
            streamplot method requires matplotlib 1.2 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)
        try:
            ret =  ax.streamplot(x,y,u,v,*args,**kwargs)
        except:
            ax.hold(b)
            raise
        ax.hold(b)
        if plt is not None and ret.lines.get_array() is not None:
            plt.sci(ret.lines)
        # clip for round polar plots.
        # streamplot arrows not returned in matplotlib 1.1.1, so clip all
        # FancyArrow patches attached to axes instance.
        if self. round:
            ret,c = self._clipcircle(ax,ret)
            for p in ax.patches:
                if isinstance(p,FancyArrowPatch): p.set_clip_path(c)
        # set axes limits to fit map region.
        self.set_axes_limits(ax=ax)
        return ret