Draw out each guide definition

        Parameters
        ----------
        gdefs : list of guide_legend|guide_colorbar
            guide definitions
        theme : theme
            Plot theme

        Returns
        -------
        out : list of matplotlib.offsetbox.Offsetbox
            A drawing of each legend

def draw(self, gdefs, theme):
        """
        Draw out each guide definition

        Parameters
        ----------
        gdefs : list of guide_legend|guide_colorbar
            guide definitions
        theme : theme
            Plot theme

        Returns
        -------
        out : list of matplotlib.offsetbox.Offsetbox
            A drawing of each legend
        """
        for g in gdefs:
            g.theme = theme
            g._set_defaults()
        return [g.draw() for g in gdefs]