重叠的图行进行分组，效果如下：

纵向投影重叠（横向移动冲突）可以分组:

 纵向冲突也可以分组：

也可根据颜色不同分组：

部分代码如下，完整代码见文章下方名片 

 public class Class1{[CommandMethod("xx")]public void XX(){var entities = Z.db.SelectEntities<Entity>();var bigList = Z.GroupEntities(entities);foreach (var smallList in bigList){//Extents3d extents = new Extents3d();//entity.ForEach(x => extents.AddExtents(x.GeometricExtents));//x=>extents.Z.GetboxsAndDraw(smallList);}}

  public static List<T> SelectEntities<T>(this Database db ) where T : Entity{List<T> result = new List<T>();Editor editor = Application.DocumentManager.MdiActiveDocument.Editor;var pso = new PromptSelectionOptions();pso.MessageForAdding = "\n请选择：";PromptSelectionResult psr = editor.GetSelection(pso);if (psr.Status == PromptStatus.OK){ObjectId[] objectids = psr.Value.GetObjectIds();Database database = HostApplicationServices.WorkingDatabase;using (Transaction tran = database.TransactionManager.StartTransaction()){foreach (var item in objectids){Entity entity = item.GetObject(OpenMode.ForRead) as Entity;if (entity is T){result.Add(entity as T);}}}}return result;}

      class Friend{public int Id { set; get; }public List<Friend> Friends { get; set; }public Friend(int id){Id = id;Friends = new List<Friend>();}}

  public static bool IsOverlapping(Entity entity1, Entity entity2){Point3dCollection pos = new Point3dCollection();entity1.IntersectWith(entity2, Intersect.OnBothOperands, pos, IntPtr.Zero, IntPtr.Zero);return pos.Count > 0;}

     public static ObjectId GetboxsAndDraw(List<Entity> entities){List<double> lis = new List<double>();if (entities.Count == 0){return ObjectId.Null;}double minx = entities.Min(x => x.Bounds.Value.MinPoint.X);double miny = entities.Min(x => x.Bounds.Value.MinPoint.Y);double maxx = entities.Max(x => x.Bounds.Value.MaxPoint.X);double maxy = entities.Max(x => x.Bounds.Value.MaxPoint.Y);lis.Add(minx);lis.Add(miny);lis.Add(maxx);lis.Add(maxy);Autodesk.AutoCAD.DatabaseServices.Polyline pl = new Autodesk.AutoCAD.DatabaseServices.Polyline();pl.AddVertexAt(0, new Point2d(minx ,miny),0,0,0);pl.AddVertexAt(0, new Point2d(maxx, miny), 0, 0, 0);pl.AddVertexAt(0, new Point2d(maxx, maxy), 0, 0, 0);pl.AddVertexAt(0, new Point2d(minx, maxy), 0, 0, 0);pl.Closed = true;pl.ColorIndex = 1;db.AddEntityToModeSpace(pl);return pl.ObjectId;}

   public static List<List<Entity>> GroupEntities(List<Entity> entities){List<List<Entity>> result = new List<List<Entity>>();List<Friend> friends = new List<Friend>();for (int i = 0; i < entities.Count; i++){Friend friend = new Friend(i);friends.Add(friend);}for (int i = 0; i < entities.Count - 1; i++){for (int j = 0; j < entities.Count; j++){if (Z.IsOverlapping(entities[i], entities[j])){friends[i].Friends.Add(friends[j]);friends[j].Friends.Add(friends[i]);}}}
****部分代码return result;}