Scale nested blocks and refresh graphics

[E3DE]

Hi,

In my dwg I have blockrefrences entities that contains n nested blockreferences. For example a chair block and its nested blocks: arms, legs, back, etc.

My program cycles over each nestest block and change the scale factors.

The problem is that I need to change view to see the changes.

I try to use QueueForGraphicsFlush with no result.

Thank you

This is my sample code:

        [CommandMethod("scalanestedblocks", CommandFlags.Transparent)]
        public void scalanestedblocks()
        {
            Document d = ACAP.Application.DocumentManager.MdiActiveDocument;
            Editor ed = d.Editor;

            var per = ed.GetEntity("Select blockreference:");
            if (per.Status == PromptStatus.OK)
            {
                using (Transaction tr = d.TransactionManager.StartTransaction())
                {
                    BlockReference mainBlockRef = tr.GetObject(per.ObjectId, OpenMode.ForWrite) as BlockReference;
                    if (mainBlockRef == null) return;

                    BlockTableRecord mainBTR = tr.GetObject(mainBlockRef.BlockTableRecord, OpenMode.ForWrite) as BlockTableRecord;
                    if (mainBTR == null)
                        return;

                    ed.WriteMessage("Main block ref: " + mainBTR.Name + Environment.NewLine);

                    foreach (ObjectId nestedBlokRefId in mainBTR)
                    {
                        BlockReference nestedBlockRef = tr.GetObject(nestedBlokRefId, OpenMode.ForWrite) as BlockReference;
                        if (nestedBlockRef == null) 
                            continue;

                        ed.WriteMessage("       +--- Nested block ref: " + nestedBlockRef.Name + Environment.NewLine);

                        if (nestedBlockRef.ScaleFactors.X < 1.5)
                            nestedBlockRef.ScaleFactors = new Scale3d(2, 2, 2);
                        else
                            nestedBlockRef.ScaleFactors = new Scale3d(1, 1, 1);
                    }

                    d.TransactionManager.QueueForGraphicsFlush();
                    d.TransactionManager.FlushGraphics();
                    tr.Commit();
                }
            }
        }

[_gile · Accepted solution]

Hi,

Just add: ed.Regen(); at the end of your code.

Some remarks:

You could avoid checking if an entity is null after opening it as 'some type':

- you can define allowed classes using a PromptEntityOptions instance

- you can check the ObjectId.ObjectClass before opening it.

        [CommandMethod("SCALANESTEDBLOCKS", CommandFlags.Transparent)]
        public void ScalaNestedBlocks()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            var options = new PromptEntityOptions("\nSelect block reference: ");
            options.SetRejectMessage("\nSelected object is not a bloc reference.");
            options.AddAllowedClass(typeof(BlockReference), true);
            var result = ed.GetEntity(options);
            if (result.Status != PromptStatus.OK)
                return;
            using (var tr = db.TransactionManager.StartTransaction())
            {
                var br = (BlockReference)tr.GetObject(result.ObjectId, OpenMode.ForRead);
                var btr = (BlockTableRecord)tr.GetObject(br.BlockTableRecord, OpenMode.ForRead);
                var brClass = RXObject.GetClass(typeof(BlockReference));
                foreach (ObjectId id in btr)
                {
                    if (id.ObjectClass == brClass)
                    {
                        var nestedBr = (BlockReference)tr.GetObject(id, OpenMode.ForWrite);
                        if (nestedBr.ScaleFactors.X < 1.5)
                            nestedBr.ScaleFactors = new Scale3d(2.0, 2.0, 2.0);
                        else
                            nestedBr.ScaleFactors = new Scale3d(1.0, 1.0, 1.0);
                    }
                }
                tr.Commit();
            }
            ed.Regen();
        }

PS: it would be nice of you if you give some feedback on the answers you got in your previous posts.

[E3DE]

Thank you,

My application do this operation on many "main" blocks.

Is it possibile to regen/refresh single blockrefence after setting scale factor?

Thank you very much

[_gile]

Could you clarify what you mean with "regen/refresh single blockrefence after setting scale factor" because "setting scale factor" is done in the block table record and this will affect all the block references.

[E3DE]

Yes, 
I need to precess many different BlockReferences (different block definition), call this primary block.For each of this I need to change scale of nested BlockReferences. It's possible to regen a main block (only this one) after has been processed and before to precess the next?Thank you

[_gile · Accepted solution]

You can update the block references calling RecordGraphicsModified(true) on each reference of the edited block table record.

        [CommandMethod("SCALANESTEDBLOCKS", CommandFlags.Transparent)]
        public void ScalaNestedBlocks()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            var options = new PromptEntityOptions("\nSelect block reference: ");
            options.SetRejectMessage("\nSelected object is not a bloc reference.");
            options.AddAllowedClass(typeof(BlockReference), true);
            var result = ed.GetEntity(options);
            if (result.Status != PromptStatus.OK)
                return;
            using (var tr = db.TransactionManager.StartTransaction())
            {
                var br = (BlockReference)tr.GetObject(result.ObjectId, OpenMode.ForRead);
                var btr = (BlockTableRecord)tr.GetObject(br.BlockTableRecord, OpenMode.ForRead);
                var brClass = RXObject.GetClass(typeof(BlockReference));
                foreach (ObjectId id in btr)
                {
                    if (id.ObjectClass == brClass)
                    {
                        var nestedBr = (BlockReference)tr.GetObject(id, OpenMode.ForWrite);
                        if (nestedBr.ScaleFactors.X < 1.5)
                            nestedBr.ScaleFactors = new Scale3d(2.0, 2.0, 2.0);
                        else
                            nestedBr.ScaleFactors = new Scale3d(1.0, 1.0, 1.0);
                    }
                }
                foreach (ObjectId id in btr.GetBlockReferenceIds(true, false))
                {
                    var b = (BlockReference)tr.GetObject(id, OpenMode.ForWrite);
                    b.RecordGraphicsModified(true);
                }
                tr.Commit();
            }
        }