facet.py 文件源码

def add_missing_facets(data, layout, vars, facet_vals):
    # When in a dataframe some layer does not have all
    # the facet variables, add the missing facet variables
    # and create new data where the points(duplicates) are
    # present in all the facets
    missing_facets = set(vars) - set(facet_vals)
    if missing_facets:
        to_add = layout.loc[:, missing_facets].drop_duplicates()
        to_add.reset_index(drop=True, inplace=True)

        # a point for each facet, [0, 1, ..., n-1, 0, 1, ..., n-1, ...]
        data_rep = np.tile(np.arange(len(data)), len(to_add))
        # a facet for each point, [0, 0, 0, 1, 1, 1, ... n-1, n-1, n-1]
        facet_rep = np.repeat(np.arange(len(to_add)), len(data))

        data = data.iloc[data_rep, :].reset_index(drop=True)
        facet_vals = facet_vals.iloc[data_rep, :].reset_index(drop=True)
        to_add = to_add.iloc[facet_rep, :].reset_index(drop=True)
        facet_vals = pd.concat([facet_vals, to_add],
                               axis=1, ignore_index=False)

    return data, facet_vals