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Add just created objects to the "previous" selectionset


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Hi there!

I wrote a code that, from a selection, generates a polyline and a hatch for every object in the selection.


How can I make these objects in the selection when the program is ended?


For example:
1. I started my program

2. select the objects I want to evaluate
3. the program creates a polyline and a hatch for every object

4. done

Now if I use the command COPY or MOVE (or whatever) I want to select these new objects with the key P (previous) and not the selection I made at point 2 above.

Thanks for the help :)


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When you make a new object you can use SSADD to add to say a second selection set so use that one for your move. Hint (ssadd (entlast) ss2)

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Hello BIGAL!
Unfortunately, I need something in c# :)
I added the tag in the question, sorry for not making that more clear :(


        public void VerificaSovrapposizioni()
            var TargetLayer = "DEST_LAYER";

            #region Get the current document and database

            var doc = Application.DocumentManager.MdiActiveDocument;
            var ed = doc.Editor;
            var db = doc.Database;


            using (var tr = db.TransactionManager.StartTransaction())
                #region Open block table record model space

                var bt = (BlockTable) tr.GetObject(db.BlockTableId, OpenMode.ForRead);
                var btr =
                    (BlockTableRecord) tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);


                // create new layer called "_sovrapposizioni"
                var layerName = "_sovrapposizioni";
                AddLayerIfNotExists(tr, db, layerName);

                // set the filter to select only polylines with the layer "_sovrapposizioni"
                var filter = new TypedValue[2];
                filter[0] = new TypedValue(0, "LWPOLYLINE");
                filter[1] = new TypedValue(8, TargetLayer);
                var sf = new SelectionFilter(filter);

                var res = ed.GetSelection(sf);
                if (res.Status == PromptStatus.OK)
                    var ss = res.Value;
                    foreach (SelectedObject sObj in ss)
                        if (sObj != null)
                            var ent = (Polyline) tr.GetObject(sObj.ObjectId, OpenMode.ForRead);
                            var acObjIdColl = new ObjectIdCollection();
                            using (var acPoly = new Polyline())
                                acPoly.ColorIndex = 2;
                                acPoly.Layer = layerName;
                                for (var i = 0; i <= ent.NumberOfVertices - 1; i++)
                                    acPoly.AddVertexAt(i, ent.GetPoint2dAt(i), 0, 0, 0);

                                if (acPoly.NumberOfVertices < 4)
                                    var pt1 = ent.GetPoint2dAt(0);
                                    var pt2 = ent.GetPoint2dAt(1);
                                    var angle = GetAngle(pt1, pt2);
                                    var distance = GetDistance(pt1, pt2);
                                    var pt3X = ent.GetPoint2dAt(2).X - distance * Math.Cos(angle);
                                    var pt3Y = ent.GetPoint2dAt(2).Y - distance * Math.Sin(angle);

                                    acPoly.AddVertexAt(3, new Point2d(pt3X, pt3Y), 0, 0, 0);

                                acPoly.Closed = true;

                                tr.AddNewlyCreatedDBObject(acPoly, true);

                            // Create the hatch object and append it to the block table record
                            using (var acHatch = new Hatch())
                                tr.AddNewlyCreatedDBObject(acHatch, true);
                                acHatch.SetHatchPattern(HatchPatternType.PreDefined, "SOLID");
                                acHatch.Layer = layerName;
                                var color = Color.FromColorIndex(ColorMethod.ByAci, 1);
                                acHatch.Color = color;
                                // create a new transparency color for the hatch
                                acHatch.Transparency = new Transparency(50);
                                acHatch.Associative = true;
                                acHatch.AppendLoop(HatchLoopTypes.Outermost, acObjIdColl);



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I was able to add elements to the current selection, which is quite ok. (once you finish the program you find them already selected, without having to start a program and press P)

Still not able to figure out how to replace previous objects with those just created ones.


ObjectIdCollection IDs = new ObjectIdCollection();
ObjectId[] idArray = IDs.Cast<ObjectId>().ToArray();


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