AttributeDefinition's position property doesn't work

[Miralkong]

Hi, guys. I'm trying to create a block with attribute with it. But no matter how I adjust the position property of attributedefinition, the attribute still be insert in the origin point(Like in the following code, I assigned (12,0,0) as it's insert point, but still shows in (0,0,0)). Could anyone tell me how to adjust the position of the attribute in a block. Thanks a lot! The following the the code:

public void InsertingBlockWithAnAttribute()
        {
            Document acDoc = Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                BlockTable acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;

                ObjectId blkRecId = ObjectId.Null;

                if (!acBlkTbl.Has("ZH_Elevation"))
                {
                    BlockTableRecord elevatioanRecord = new BlockTableRecord();
                    elevatioanRecord.Name = "ZH_Elevation";

                    Point3d elevationMarkInsertPt = new Point3d(0, 0, 0);

                    elevatioanRecord.Origin = elevationMarkInsertPt;

                    using (Polyline acPolyline = new Polyline())
                    {
                        acPolyline.AddVertexAt(acPolyline.NumberOfVertices, new Point2d(-3, 3), 0, 0, 0);
                        acPolyline.AddVertexAt(acPolyline.NumberOfVertices, new Point2d(0, 0), 0, 0, 0);
                        acPolyline.AddVertexAt(acPolyline.NumberOfVertices, new Point2d(3, 3), 0, 0, 0);
                        acPolyline.AddVertexAt(acPolyline.NumberOfVertices, new Point2d(-12, 3), 0, 0, 0);
                        elevatioanRecord.AppendEntity(acPolyline);

                        using (AttributeDefinition acAttDef = new AttributeDefinition())
                        {
                            acAttDef.Position = new Point3d(-12, 0, 0);
                            acAttDef.Prompt = "Elevation";
                            acAttDef.Tag = "ElevationMark";
                            acAttDef.TextString = elevationMarkInsertPt.Y == 0 ? "%%P" + elevationMarkInsertPt.Y.ToString("f3") : elevationMarkInsertPt.Y.ToString("f3");
                            acAttDef.Height = 3;
                            acAttDef.Justify = AttachmentPoint.BottomLeft;
                            acAttDef.Verifiable = false;
                            elevatioanRecord.AppendEntity(acAttDef);
                            acBlkTbl.UpgradeOpen();
                            acBlkTbl.Add(elevatioanRecord);
                            acTrans.AddNewlyCreatedDBObject(elevatioanRecord, true);
                        }

                    }
                    blkRecId = elevatioanRecord.Id;
                }
                else
                {
                    blkRecId = acBlkTbl["ZH_Elevation"];
                }

                if (blkRecId != null)
                {
                    BlockTableRecord acBlkTblRec = acTrans.GetObject(blkRecId, OpenMode.ForRead) as BlockTableRecord;

                    using (BlockReference acBlkRef = new BlockReference(new Point3d(0, 0, 0), blkRecId))
                    {
                        BlockTableRecord acCurSpaceBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;

                        acCurSpaceBlkTblRec.AppendEntity(acBlkRef);
                        acTrans.AddNewlyCreatedDBObject(acBlkRef, true);

                        if (acBlkTblRec.HasAttributeDefinitions)
                        {
                            foreach (ObjectId objectId in acBlkTblRec)
                            {
                                DBObject dbObj = acTrans.GetObject(objectId, OpenMode.ForRead) as DBObject;
                                if (dbObj is AttributeDefinition)
                                {
                                    AttributeDefinition attTemp = dbObj as AttributeDefinition;
                                    if (!attTemp.Constant)
                                    {
                                        using (AttributeReference attTempRef = new AttributeReference())
                                        {
                                            attTempRef.SetAttributeFromBlock(attTemp, acBlkRef.BlockTransform);
                                            Vector3d a = new Point3d(0, 0, 0).GetVectorTo(new Point3d(-12, 0, 0));
                                            attTempRef.Position = attTemp.Position.TransformBy(Matrix3d.Displacement(a));

                                            attTempRef.TextString = attTempRef.Position.Y.ToString("f3");
                                            acBlkRef.AttributeCollection.AppendAttribute(attTempRef);

                                            acTrans.AddNewlyCreatedDBObject(attTempRef, true);
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                acTrans.Commit();
            }

        }

[_gile · Accepted solution]

Hi,

While AttachmentPoint is different from AttachmentPoint.BaseLeft, you have to specify the AlignmentPoint property.

[Miralkong]

Hi, thanks. That works.

But I'm still wondering that what's the function of acAttDef.Position. From the developer's guide, it seems that it controls the location point of attribute, however I can't find any difference with several parameters set to it and even if I comment the code, it makes no different and no error message.

[_gile]

When DBText.Justify == AttachmentPoint.BaseLeft the Position property is used and AlignmentPoint is ignored.

In all other cases, AlignmentPoint is used and the setting of Position property is ignored , but AutoCAD cinternally sets this property to be at the BaseLeft position of the text.

Liddle center justified text:

[Miralkong]

I see, thanks a lot.