Function _determine_guide

xarray/plot/utils.py:1682–1711

(
    hueplt_norm: _Normalize,
    sizeplt_norm: _Normalize,
    add_colorbar: bool | None = None,
    add_legend: bool | None = None,
    plotfunc_name: str | None = None,
)

def _determine_guide(
    hueplt_norm: _Normalize,
    sizeplt_norm: _Normalize,
    add_colorbar: bool | None = None,
    add_legend: bool | None = None,
    plotfunc_name: str | None = None,
) -> tuple[bool, bool]:
    if plotfunc_name == "hist":
        return False, False

    if (add_colorbar) and hueplt_norm.data is None:
        raise KeyError("Cannot create a colorbar when hue is None.")
    if add_colorbar is None:
        if hueplt_norm.data is not None:
            add_colorbar = True
        else:
            add_colorbar = False

    if add_legend and hueplt_norm.data is None and sizeplt_norm.data is None:
        raise KeyError("Cannot create a legend when hue and markersize is None.")
    if add_legend is None:
        if (
            not add_colorbar
            and (hueplt_norm.data is not None and hueplt_norm.data_is_numeric is False)
        ) or sizeplt_norm.data is not None:
            add_legend = True
        else:
            add_legend = False

    return add_colorbar, add_legend


def _add_legend(