Do zoom extents in C# .NET (AutoCAD)

[Anonymous]

Hi!!

I am developing a plugin for AutoCAD and I want to Know how to do Zoom Extents in C# .NET 

[_gile]

Hi,

The shorter and simpler way is to call the COM AcadApplication.ZoomExtents() method. This can be done without referencing COM libraries by using the dynamic type

dynamic acadApp = Autodesk.AutoCAD.ApplicationServices.Application.AcadApplication;
acadApp.ZoomExtents();

[_gile · Accepted solution]

You can also use the following extension method:

    public static class EditorExtension
    {
        public static void Zoom(this Editor ed, Extents3d ext)
        {
            if (ed == null)
                throw new ArgumentNullException("ed");
            using (ViewTableRecord view = ed.GetCurrentView())
            {
                Matrix3d worldToEye = Matrix3d.WorldToPlane(view.ViewDirection) *
                    Matrix3d.Displacement(Point3d.Origin - view.Target) *
                    Matrix3d.Rotation(view.ViewTwist, view.ViewDirection, view.Target);
                ext.TransformBy(worldToEye);
                view.Width = ext.MaxPoint.X - ext.MinPoint.X;
                view.Height = ext.MaxPoint.Y - ext.MinPoint.Y;
                view.CenterPoint = new Point2d(
                    (ext.MaxPoint.X + ext.MinPoint.X) / 2.0,
                    (ext.MaxPoint.Y + ext.MinPoint.Y) / 2.0);
                ed.SetCurrentView(view);
            }
        }

        public static void ZoomExtents(this Editor ed)
        {
            Database db = ed.Document.Database;
            db.UpdateExt(false);
            Extents3d ext = (short)Application.GetSystemVariable("cvport") == 1 ?
                new Extents3d(db.Pextmin, db.Pextmax) :
                new Extents3d(db.Extmin, db.Extmax);
            ed.Zoom(ext);
        }
    }

 Using

Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.ZoomExtents();

[Anonymous]

Hi Gile,

I was trying to use your code to zoom extents and I'm getting an eNotApplicable error in the line

using (ViewTableRecord view = ed.GetCurrentView())

Basically the codes that call this methos is 

DocumentCollection docCollection = Application.DocumentManager;

doc = docCollection.Open(dwg.ToString(), false, null);
Application.DocumentManager.MdiActiveDocument = doc;

using (doc.LockDocument())
{
LayoutManager.Current.CurrentLayout = "Model";

doc.Editor.ZoomExtents(); ----->Here I get the exception

[_gile]

Hi,

There's nothing wrong with the code you show. The error is due to something else.

[Anonymous]

Thanks Gilles, looks like it was a session flag problem.

[1603567506]

If I write it this way, he will shrink the window and move the coordinates to a very large position. Why is that?

[nshupeFMPE3]

---

@_gile wrote:

Hi,

The shorter and simpler way is to call the COM AcadApplication.ZoomExtents() method. This can be done without referencing COM libraries by using the dynamic type

dynamic acadApp = Autodesk.AutoCAD.ApplicationServices.Application.AcadApplication;
acadApp.ZoomExtents();

---

May I ask a question about this? You mention not needing to reference COM libraries. I recently went through a lot of learning around COM and the C++ api for AutoCAD in order to get this code from Kean to work for adding properties to the Properties window in ACAD. But in using dynamic like you show above, are you accessing the underlying objects, not just those that are exposed to .NET?