Method-to-plot-indicator-with-color-changing-on-up-down-of-values

CODE:
    /// <summary>
    ///     Plot an indicator with up and down colors. When the indicator value is greater than the previous value, the upColor
    ///     is used. When the indicator value is less than the previous value, the downColor is used. When the indicator value
    ///     is equal to the previous value, the equalColor is used.
    /// </summary>
    /// <param name="userStrategyBase">The strategy for the plot</param>
    /// <param name="indicator">The indicator to plot</param>
    /// <param name="upColor">
    ///     The indicator's color when its value goes up versus the previous bar. Defaults to the chart
    ///     theme's up bar color.
    /// </param>
    /// <param name="downColor">
    ///     The indicator's color when its value goes down versus the previous bar. Defaults to the chart
    ///     theme's down bar color.
    /// </param>
    /// <param name="equalColor">
    ///     The indicator's color when its value is equal to the previous bar's value. Defaults to
    ///     WLColor.Gray
    /// </param>
    /// <param name="plotStyle">The indicator's plot style</param>
    /// <param name="suppressLabels">
    ///     Set to true to disable the indicator pane labels and value markers on the chart's
    ///     right margin
    /// </param>
    /// <param name="paneTag">The pane's tag where the indicator will be shown</param>
    public static void PlotIndicatorWithUpDownColors(this UserStrategyBase userStrategyBase, IndicatorBase indicator,
        WLColor upColor = null, WLColor downColor = null, WLColor equalColor = null,
        PlotStyle plotStyle = PlotStyle.Line,
        bool suppressLabels = false, string paneTag = null)
    {
        var cp = WealthLab.ChartWPF.ChartThemeFactory.Instance.SelectedTheme;
        downColor ??= cp.ColorDownBar;
        upColor ??= cp.ColorUpBar;
        equalColor ??= WLColor.Gray;

        userStrategyBase.PlotIndicator(indicator, upColor, plotStyle, suppressLabels, paneTag);

        for (var i = 1; i < indicator.Count; i++)
        {
            userStrategyBase.SetSeriesBarColor(indicator, i, indicator[i] > indicator[i - 1]
                ? upColor : indicator[i] < indicator[i - 1] ? downColor : equalColor);
        }
    }