Function create_grouped_bar_chart 

pub fn create_grouped_bar_chart<'a, Outer, Inner>(
    grouped_time_log: BTreeMap<impl Into<Option<&'a Outer>>, BTreeMap<impl Into<Option<&'a Inner>> + Clone, Vec<&'a TimeLog>>>,
    title: &str,
    x_axis_label_rotate: f64,
    render: &mut RenderOptions<'_>,
) -> Result<(), ChartSettingError>
where
    Outer: Display + 'a,
    Inner: Display + 'a,

Create a grouped bar chart, i.e., Hours per Label per User.

Parameters

• grouped_time_log: A map of Outer keys (e.g., Label) to a map of Inner keys (e.g., User) to value (Duration)
• title: The title of the chart
• x_axis_label_rotate: The rotation of the X-axis labels.
• render: Options for the rendering of the chart.

Errors

• Returns ChartSettingError::CharmingError if the creation of the chart failed.
• Returns ChartSettingError::FileNotFound if the theme file in RenderOptions does not exist.
• Returns ChartSettingError::IoError if there was an error reading or writing from/to the filesystem.