Layers Pattern in Practice

using System.Collections.Generic;
using System.Linq;
using Visifire.Charts;

namespace BillPayManager.Charting
{
    /// <summary>
    /// Charting tool
    /// </summary>
    public class LineCharting : ICharting
    {
        #region ICharting
        /// <summary>
        /// Gets Chart Title
        /// </summary>
        /// <param name="name">Name of the chart</param>
        /// <returns>Title object</returns>
        public Title GetTitle(string name)
        {
            Title title = new Title {Text = name};
            return title;
        }
        /// <summary>
        /// Get chart axis
        /// </summary>
        /// <param name="type">Type of the interval</param>
        /// <param name="list">List</param>
        /// <returns>Axis object</returns>
        public Axis GetAxis(IntervalTypes type, IEnumerable<BillsEntityLib.Bill> list)
        {
            // Create a new Axis
            Axis axis = new Axis {IntervalType = type, Interval = (list == null) ? 0 : list.Count()};
            return axis;
        }

        /// <summary>
        /// Get data series object
        /// </summary>
        /// <param name="list">List of bills</param>
        /// <param name="valueType">Chart value type</param>
        /// <returns>DataSeries object</returns>
        public DataSeries GetDataSeries(IEnumerable<BillsEntityLib.Bill> list, ChartValueTypes valueType)
        {
            // Create a new instance of DataSeries
            DataSeries dataSeries = new DataSeries {RenderAs = RenderAs.Line, XValueType = valueType};

            if (list == null)
                return dataSeries;
            foreach (BillsEntityLib.Bill bill in list)
            {
                // Create a new instance of DataPoint
                DataPoint dataPoint = new DataPoint {XValue = bill.AddedOn, YValue = (double) bill.Amount};

                // Set XValue for a DataPoint

                // Set YValue for a DataPoint

                // Add dataPoint to DataPoints collection
                dataSeries.DataPoints.Add(dataPoint);
            }

            return dataSeries;
        }
        #endregion
    }
}