########################################################################
#
# Module: module_distribution.py
#
# Author: <NAME> <<EMAIL>>
#
# Description: This module contains a method to plot a
#                  kernel density estimate function
########################################################################

import pandas as pd


def plotDensityDF(data, ax, colors, lb=""):
    """
    Plots a density plot from a dataframe

    :Arguments:
        :type data: pandas dataframe
        :param data: data to be plotted

        :type ax: matplotlib axis
        :param ax: axis to be drawn on

        :type colors: list of colors
        :param colors: colors to be used in differentiating plots

        :type lb: string
        :param lb: optional label for legend
    """
    data.plot(kind="density", ax=ax, legend=False, color=colors, label=lb, grid=False)

    # Adjust xlim if values are not negative
    xmin, xmax = ax.get_xlim()
    if xmin <= 0:
        ax.set_xlim(0, xmax)
