plot.py 文件源码

def get_extents(self, element, ranges):
        """
        Subclasses the get_extents method using the GeoAxes
        set_extent method to project the extents to the
        Elements coordinate reference system.
        """
        extents = super(GeoPlot, self).get_extents(element, ranges)
        if not getattr(element, 'crs', None) or not self.geographic:
            return extents
        elif any(e is None or not np.isfinite(e) for e in extents):
            extents = None
        else:
            try:
                extents = project_extents(extents, element.crs, DEFAULT_PROJ)
            except:
                extents = None
        return (np.NaN,)*4 if not extents else extents