matplotlib.py 文件源码

def _get_alpha_data(data, kwargs):
    """Get alpha values for all data points.

    Parameters
    ----------
    data : array_like
    alpha: Callable or float
        This can be a fixed value or a function of the data.

    Returns
    -------
    array_like
    """
    alpha = kwargs.pop("alpha", 1)
    if hasattr(alpha, "__call__"):
        return np.vectorize(alpha)(data)
    return alpha