def METHOD_NAME(self, layer, plot):
    """
    Return the aesthetics that contribute to the legend
    Parameters
    ----------
    layer : Layer
        Layer whose legend is to be drawn
    plot : ggplot
        Plot object
    Returns
    -------
    matched : list
        List of the names of the aethetics that contribute
        to the legend.
    """
    l = layer
    legend_ae = set(self.key.columns) - {"label"}
    all_ae = (
        l.mapping.keys()
        | (plot.mapping if l.inherit_aes else set())
        | l.stat.DEFAULT_AES.keys()
    )
    geom_ae = l.geom.REQUIRED_AES | l.geom.DEFAULT_AES.keys()
    matched = all_ae & geom_ae & legend_ae
    matched = list(matched - set(l.geom.aes_params))
    return matched