How to scale geometry in drawing and move attributes? C#

[szm.bordel352396]

I am absolute noob in this area but I decided to do something with it. I'd like to achieve this: there is a drawing with a geometry - lets say a circle - and attribute definition. What I like to do is to scale everything in the drawing by 2 and additionaly to move attribute to nearest grid point (if an attribute definition is located in [10.1,14.9] it should be moved to [10,15]. To be honest I know how to create new simple objects, but I dont know how to handle existing stuff and have no idea how to query location from attribute definitions.Any help appreciated! Thanks!
ps: VS2013/ACAD2015
example drawings in 2010/2013 format attached.

[miguel.alanis676874]

One way is that you pass the ObjectIdCollection of the entities you want to edit, the other one is iterating the current block.
For scaling a moving you can make a function that receive the ObjectIdCollection

 public void ScaleAndMove(ObjectIdCollection objIds, double scaleFactor = 2)
        {
            Document currentDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            const double gridSize=5;
            using (Transaction tr = currentDoc.Database.TransactionManager.StartTransaction())
            {
                try
                {
                    Entity ent;
                    foreach (ObjectId objId in objIds)
                    {
                        //Open Object as Entity, anything that can be drew is an entity
                        ent = objId.GetObject(OpenMode.ForWrite) as Entity;
                        //Use the center of the entity as scale point
                        Point3d min = ent.GeometricExtents.MinPoint,
                                max = ent.GeometricExtents.MaxPoint,
                                mid = new Point3d((min.X + max.X) / 2, (min.Y + max.Y) / 2, (min.Y + max.Y) / 2);
                        //Scale using the selected factor
                        ent.TransformBy(Matrix3d.Scaling(scaleFactor, mid));
                        //If the entity is an attribute definition,
                        //it will be moved to the nearest grip point
                        //Assuming that the grid is size 5
                        if (ent is AttributeDefinition)
                        {
                            AttributeDefinition attDef = ent as AttributeDefinition;
                            //Use the position defined in the attDef
                            Point3d currentPos = attDef.Position;
                            //Gets the nearest point
                            double x = (Math.Round(currentPos.X / gridSize) * gridSize),
                                   y = (Math.Round(currentPos.Y / gridSize) * gridSize), 
                                   z = (Math.Round(currentPos.Z / gridSize) * gridSize);
                            //Move
                            Vector3d vec = currentPos.GetVectorTo(new Point3d(x, y, z));
                            attDef.TransformBy(Matrix3d.Displacement(vec));
                        }
                    }
                    tr.Commit();
                }
                catch (Autodesk.AutoCAD.Runtime.Exception)
                {
                    tr.Abort();
                    //Something goes wrong in AutoCAD
                }
                catch (System.Exception)
                {
                    tr.Abort();
                    //Something else goes wrong
                }
            }
        }