Messages

layout.Extents;

What kind of changed do you want to make ?
On of the simplest change to a block is appending an entity to the ModelSpace Block, like so:

[CommandMethod("drawline")]
    static public void drawline()
    {
      Database db = HostApplicationServices.WorkingDatabase;
      using (Transaction tr = db.TransactionManager.StartTransaction())
     
        BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        BlockTableRecord ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
        Line ln = new Line(new Point3d(10, 10, 0), new Point3d(20, 20, 0));
        ms.AppendEntity(ln);
        tr.AddNewlyCreatedDBObject(ln, true);
        tr.Commit();
      }
    }


Doesn't contribute to any award and not the best way to do it, but it might get you get started

using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;

using System.Collections.Generic;
using System.Linq;
using System.IO;


// This line is not mandatory, but improves loading performances
[assembly: CommandClass(typeof(AcadExport.MyCommands))]

namespace AcadExport
{
    public class MyCommands
    {
        [CommandMethod("ExportLayout", CommandFlags.Modal | CommandFlags.Session)]
        public void ExportLayout() // This method can have any name
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;

            //if (doc.Name.Length < 1)
            //{
            //    ed.WriteMessage("\nDrawing not saved yet");
            //    return;
            //}
            //string docPath = Path.GetDirectoryName(doc.Name);
            //string docFilename = Path.GetFileNameWithoutExtension(doc.Name);

            foreach (string lytName in GetLayoutNames(db))
            {
                CopyLayout(doc.Name, lytName);
            }
            Application.DocumentManager.MdiActiveDocument=doc;

        }

 


        public List<string> GetLayoutNames(Database db)
        {
            var layoutNames = new List<string>();

            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                DBDictionary lytDct = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForRead);
                foreach (DBDictionaryEntry lytDe in lytDct)
                {
                    if (lytDe.Key != "Model")
                    {
                        //Return the names of Non Empty Layouts only
                        Layout lyt = (Layout)tr.GetObject(lytDe.Value, OpenMode.ForRead);
                        BlockTableRecord ltr = (BlockTableRecord)tr.GetObject(lyt.BlockTableRecordId, OpenMode.ForRead);
                        if (ltr.Cast<ObjectId>().Count() > 1)
                            layoutNames.Add(lyt.LayoutName);
                    }
                }
                tr.Commit();
            }
            return layoutNames;
        }


        public void CopyLayout(string docPathname, string layoutName)
        {
            string tmpPathname = Path.Combine(Path.GetTempPath(), Path.GetTempFileName() + ".dwg");
            string expDocPathname = Path.Combine(
            Path.GetDirectoryName(docPathname),
            Path.GetFileNameWithoutExtension(docPathname) +
            "_" + layoutName + ".dwg");

            File.Copy(docPathname, tmpPathname, true);

            Document doc = Application.DocumentManager.Open(tmpPathname, false);
            Application.DocumentManager.MdiActiveDocument = doc;
            Database db = doc.Database;
            Editor ed = doc.Editor;
            using (doc.LockDocument())
            {
                using (Transaction tr = db.TransactionManager.StartTransaction())
                {
                    LayoutManager.Current.CurrentLayout = layoutName;
                    DBDictionary lytDct = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForRead);
                    foreach (DBDictionaryEntry dictEntry in lytDct)
                    {
                        if (dictEntry.Key != "Model" && dictEntry.Key != layoutName)
                        {
                            Layout lyt = (Layout)tr.GetObject(dictEntry.Value, OpenMode.ForWrite);
                            //if (!lyt.ModelType)
                            lyt.Erase();
                        }
                    }
                    tr.Commit();
                    ed.Regen();
                }

                db.SaveAs(expDocPathname,true, DwgVersion.Newest,db.SecurityParameters);
            }
            //File.Delete(tmpPathname);
        }

    }
}

Hi Gile,
Thanks you for replying and sorry for my late responding.
While experimenting i noticed that i can remove the eventhandler without errors even if it is not defined.
So for the code below I can always call REMEV as much as i like without calling ADDEV.
The line "\nFailed to remove eventhandler" will never be executed
So i think the only solution is to add a variable eventsEnabled to prevent duplicated calls to ADDEV

Gr,
Frits

However everytime you call ADDEV, new (duplicated) eventhandlers will be added.
So

        [CommandMethod("AddEv")]
        public void AddEvents()
        {
            LayoutManager layMgr = LayoutManager.Current;
            layMgr.LayoutSwitched += new Autodesk.AutoCAD.DatabaseServices.LayoutEventHandler(OnLayoutSwitched);

        }

        [CommandMethod("RemEv")]
        public void RemoveEvents()
        {
            try
            {
                LayoutManager layMgr = LayoutManager.Current;
                layMgr.LayoutSwitched -= new Autodesk.AutoCAD.DatabaseServices.LayoutEventHandler(OnLayoutSwitched);
            }
            catch
            {
                Document doc = Application.DocumentManager.MdiActiveDocument;
                Editor ed = doc.Editor;
                ed.WriteMessage("\nFailed to remove eventhandler");
            }

        }

       public void OnLayoutSwitched(object senderObj, Autodesk.AutoCAD.DatabaseServices.LayoutEventArgs layoutEventArgs)
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Editor ed = doc.Editor;
            ed.WriteMessage("\nOnLayoutSwitched={0}", layoutEventArgs.Name);
        }

Amazing, this gives me even more options to write nicer code.
Thanks.

In combination with the Kaefer extensions for DBObjects  they can be made even easier


  public static class KaeferExtensions
    {
        // Opens a DBObject in ForRead mode (kaefer @ TheSwamp)
        public static T GetObject<T>(this ObjectId id) where T : DBObject
        {
            return id.GetObject<T>(OpenMode.ForRead);
        }

        // Opens a DBObject in the given mode (kaefer @ TheSwamp)
        public static T GetObject<T>(this ObjectId id, OpenMode mode) where T : DBObject
        {
            return id.GetObject(mode) as T;
        }
        // Opens a collection of DBObject in ForRead mode (kaefer @ TheSwamp)       
        public static IEnumerable<T> GetObjects<T>(this IEnumerable ids) where T : DBObject
        {
            return ids.GetObjects<T>(OpenMode.ForRead);
        }

        // Opens a collection of DBObject in the given mode (kaefer @ TheSwamp)
        public static IEnumerable<T> GetObjects<T>(this IEnumerable ids, OpenMode mode) where T : DBObject
        {
            return ids
                .Cast<ObjectId>()
                .Select(id => id.GetObject<T>(mode))
                .Where(res => res != null);
        }

        // Applies the given Action to each element of the collection (mimics the F# Seq.iter function).
        public static void Iterate<T>(this IEnumerable<T> collection, Action<T> action)
        {
            foreach (T item in collection) action(item);
        }

        // Applies the given Action to each element of the collection (mimics the F# Seq.iteri function).
        // The integer passed to the Action indicates the index of element.
        public static void Iterate<T>(this IEnumerable<T> collection, Action<T, int> action)
        {
            int i = 0;
            foreach (T item in collection) action(item, i++);
        }
    }

...

//using KeaderExtensions:
                    pvpFrozenLayerNames = lt.GetObjects<LayerTableRecord>()
                        .Where(ly => ly.IsOff)
                        .Where(ly => ly.IsFrozen)
                        .Select(ly => ly.Name)
                        .ToList();





Hi Gile,
Thank you for posting this new version. Currently i am working on the Paperspace to Modelspace transformation and testing code for these calculations. But i can't get it right.
This is the scenario:
Simple Viewport rotated and zoomed to a rectangle in modelspace, see attachment.
When executing the command MSPVP1 an exact matching rectangle presenting the Paperspace Viewport border will be created in Modelspace.
When executing the command msPVPByGile there is a small displacement.
I suppose there is a problem with the order of the Matrix transformation in
Matrix3d ps2wcs = pvp2.PSDCS2DCS() * pvp2.DCS2WCS();

Any suggestions?
Greetings,
Frits

Hi Gile,
If anyone can help you're the one.
I few years ago i wrote a VBA program for AutoCAD doing Geometric calculations on Boundaries -- Polylines including Polylines.
Part of the program involved the creation of the closed polylines, which you have elegantly solved in c#.
Another Part is the calculation of the Moments of Inertia and the the Centroids also solved in the Geometry Extensions class.
I've tried to include the Moments of Inertia calculation but because of too little experience in c# not succeeded yet.

The problem is that to my knowledge the Moments of Inertia can exactly be determined for (rotated) arc shaped contours using a Cone(Segment+Triangle), not a Segment. (see GeoCalcArc)

I like the way you calculate the area dividing everything in triangles and Arc Segment, it's far more elegant than my way of dividing everything in cones and trapezoid.

Have you any experience with the Inertia calculations, and if so can you help me out here.

Thanks,
Frits