A set of functions for data conversion operations.
 /// <summary>
 /// Returns a sequence of the major grid line coordinates.
 /// </summary>
 /// <param name="availableSize">The available size.</param>
 /// <returns>A sequence of the major grid line coordinates.</returns>
 protected override IEnumerable <UnitValue> GetMajorGridLineCoordinates(Size availableSize)
 {
     return(GetMajorTickMarkValues(availableSize).Select(value => GetPlotAreaCoordinate(value)).Where(value => ValueHelper.CanGraph(value.Value)));
 }