Topic: ZoomExtent

[cannorth]

Hello,

 What is an ObjectArx Vb.Net variation of ZoomExtent method that doesn't use COM.

Thanks,

Cannorth

[kaefer]

What is an ObjectArx Vb.Net variation of ZoomExtent method that doesn't use COM.

By not wanting COM, I take it that you don't want to invoke a command.

You're familiar with Zoom and Pan the Current View (.NET), the actual code being under Manipulate the Current View (.NET)?

[gile]

Hi,

Here's a way using extension methods (part of my 'Acad Extensions' library.

Code - C#: [Select]

1. namespace Autodesk.AutoCAD.EditorInput
2. {
3.     public static class EditorExtension
4.     {
5.         public static void Zoom(this Editor ed, Extents3d ext)
6.         {
7.             if (ed == null)
8.                 throw new ArgumentNullException("ed");
9.  
10.             using (ViewTableRecord view = ed.GetCurrentView())
11.             {
12.                 ext.TransformBy(view.WorldToEye());
13.                 view.Width = ext.MaxPoint.X - ext.MinPoint.X;
14.                 view.Height = ext.MaxPoint.Y - ext.MinPoint.Y;
15.                 view.CenterPoint = new Point2d(
16.                     (ext.MaxPoint.X + ext.MinPoint.X) / 2.0,
17.                     (ext.MaxPoint.Y + ext.MinPoint.Y) / 2.0);
18.                 ed.SetCurrentView(view);
19.             }
20.         }
21.  
22.         public static void ZoomExtents(this Editor ed)
23.         {
24.             if (ed == null)
25.                 throw new ArgumentNullException("ed");
26.  
27.             Database db = ed.Document.Database;
28.             Extents3d ext = (short)Application.GetSystemVariable("cvport") == 1 ?
29.                 new Extents3d(db.Pextmin, db.Pextmax) :
30.                 new Extents3d(db.Extmin, db.Extmax);
31.             ed.Zoom(ext);
32.         }
33.     }
34. }

<EDIT: the ViewTableRecord.WorldToEye() extension method code was missing>

Code - C#: [Select]

1. using System;
2. using Autodesk.AutoCAD.Geometry;
3.  
4. namespace Autodesk.AutoCAD.DatabaseServices
5. {
6.     public static class ViewTableRecordExtension
7.     {
8.         public static Matrix3d EyeToWorld(this ViewTableRecord view)
9.         {
10.             if (view == null)
11.                 throw new ArgumentNullException("view");
12.  
13.             return
14.                 Matrix3d.Rotation(-view.ViewTwist, view.ViewDirection, view.Target) *
15.                 Matrix3d.Displacement(view.Target - Point3d.Origin) *
16.                 Matrix3d.PlaneToWorld(view.ViewDirection);
17.         }
18.  
19.         public static Matrix3d WorldToEye(this ViewTableRecord view)
20.         {
21.             return view.EyeToWorld().Inverse();
22.         }
23.     }
24. }
25.