Setting/Creating a named View with associated UCS

By Philippe Leefsma

The following C# command will set an existing named view with associated UCS if it exists or create a new one and set it to the drawing extents:

[CommandMethod("SetNamedView")]

public void SetNamedView()

{

    Document doc = Application.DocumentManager.MdiActiveDocument;

    Database db = doc.Database;

    Editor ed = doc.Editor;

 

    PromptStringOptions pso = new PromptStringOptions("\nEnter view name: ");

    pso.AllowSpaces = true;

           

    PromptResult pr = ed.GetString(pso);

 

    if(pr.Status != PromptStatus.OK)

        return;

 

    using(Transaction Tx = db.TransactionManager.StartTransaction())

    {

   &#
160;    ViewTable vt = Tx.GetObject(db.ViewTableId, OpenMode.ForRead)

            as ViewTable;

 

        if(!vt.Has(pr.StringResult))

        {

            PromptKeywordOptions pko = new PromptKeywordOptions(

                "\nView does not exist, do you want to create it?");

 

            pko.AllowNone = false;

            pko.Keywords.Add("Yes");

            pko.Keywords.Add("No");

            pko.Keywords.Default = "Yes";

 

            PromptResult pkr = ed.GetKeywords(pko);

 

            if (pkr.Status != PromptStatus.OK || pkr.StringResult == "No")

                return;

 

            db.UpdateExt(true);

 

            ViewTableRecord newView = CreateViewWithExtents(

                db.Extmin,

                db.Extmax);

 

            newView.ViewDirection = new Vector3d(0, 0, 1);

 

            newView.Name = pr.StringResult;

 

            vt.UpgradeOpen();

 

            vt.Add(newView);

 

            Tx.AddNewlyCreatedDBObject(newView, true);

        }

 

        ViewTableRecord vtrToUse = Tx.GetObject(

          vt[pr.StringResult], OpenMode.ForRead)

            as ViewTableRecord;

 

        using (ViewTableRecord vtr = new ViewTableRecord())

        {

            vtr.CopyFrom(vtrToUse); 

            ed.SetCurrentView(vtr);

        }

 

        if (vtrToUse.IsUcsAssociatedToView)

        {

            UcsTable ucsTbl = Tx.GetObject(db.UcsTableId, OpenMode.ForRead)

                as UcsTable;

 

            if (ucsTbl.Has(vtrToUse.UcsName))

            {

                UcsTableRecord ucs = Tx.GetObject(

                    vtrToUse.UcsName, OpenMode.ForRead) as UcsTableRecord;

 

                ViewportTableRecord vportTblRec = Tx.GetObject(

                  ed.ActiveViewportId, OpenMode.ForWrite)

                    as ViewportTableRecord;

 

                // Display the UCS Icon at the origin of the current viewport

                vportTblRec.IconAtOrigin = true;

                vportTblRec.IconEnabled = true;

 

                // Set the UCS current

                vportTblRec.SetUcs(ucs.ObjectId);

                doc.Editor.UpdateTiledViewportsFromDatabase();

            }

        }

 

        Tx.Commit();

    }

}

 

ViewTableRecord CreateViewWithExtents(Point3d p1, Point3d p2)

{

    Point2d min2d = new Point2d(min(p1.X, p2.X), min(p1.Y, p2.Y));

    Point2d max2d = new Point2d(max(p1.X, p2.X), max(p1.Y, p2.Y));

 

    ViewTableRecord view = new ViewTableRecord();

 

    view.CenterPoint = min2d + (max2d – min2d) * 0.5;

 

   view.Height = max2d.Y – min2d.Y;

    view.Width = max2d.X – min2d.X;

 

    return view;

}

 

private double min(double a, double b)

{

    return (a < b ? a : b);

}

 

private double max(double a, double b)

{

    return (a > b ? a : b);

}

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