OpenNest/OpenNest.Engine/MultiPlateNester.cs

using System.Collections.Generic;
using System.Linq;

namespace OpenNest
{
    public static class MultiPlateNester
    {
        public static List<NestItem> SortItems(List<NestItem> items, PartSortOrder sortOrder)
        {
            switch (sortOrder)
            {
                case PartSortOrder.BoundingBoxArea:
                    return items
                        .OrderByDescending(i =>
                        {
                            var bb = i.Drawing.Program.BoundingBox();
                            return bb.Width * bb.Length;
                        })
                        .ToList();

                case PartSortOrder.Size:
                    return items
                        .OrderByDescending(i =>
                        {
                            var bb = i.Drawing.Program.BoundingBox();
                            return System.Math.Max(bb.Width, bb.Length);
                        })
                        .ToList();

                default:
                    return items.ToList();
            }
        }
    }
}