Block Reference Hatch - Deleting loops within a Hatch

[DouceDeux]

Hello all!

I want to be able to add a Block Reference to a hatch.

I'm adding the block reference to an ObjectIdCollection and the hatch is not taking it when using AddLoop().

So I thought maybe I needed to add the location of the polyline (curve-like) object that is member of the blockreference to the hatch, but I don't know how to get its ObjectId.

Hatch thisHatch = new Hatch();
thisHatch.Layer = layerName;
thisHatch.SetDatabaseDefaults();
thisHatch.SetHatchPattern(patternType, patterName);
thisHatch.Color = Color.FromColorIndex(ColorMethod.ByColor, colorIndex);
thisHatch.Transparency = new Transparency((Byte)(255 * (100 - 60) / 100));

tSpace.AppendEntity(thisHatch);
transaction.AddNewlyCreatedDBObject(thisHatch, true);

thisHatch.Associative = true;
                
ObjectIdCollection newOIC1 = new ObjectIdCollection();
newOIC1.Add(hatchElement);
thisHatch.AppendLoop(HatchLoopTypes.Default, newOIC1);
ObjectIdCollection newOIC2 = new ObjectIdCollection();
newOIC2.Add(laLosa);
thisHatch.AppendLoop(HatchLoopTypes.External, newOIC2);
thisHatch.EvaluateHatch(true);
                
ObjectIdCollection newOIC3 = new ObjectIdCollection();
newOIC3.Add(thisHatch.ObjectId);
newDOT.MoveToBottom(newOIC3);

Also, I'm trying to delete certain HatchLoop that is associated to a polyline but I don't know how to do it. I'm going through the loops in the hatch but I don't know what to do there. I wanna do this so I create a new and different hatch on top.

I think one could also copy all the loops except the one one wants to delete, but I'm not sure how to tell which one is the one I want to delete that is the one associated to a polyline or that is in certain region.

Thanks in advance.

[Alexander.Rivilis]

You can clone polyline, transform it with BlockReference.BlockTransform matrix and use this clone as a hatch loop.