ObjectIdCollection transform to new point in same drawing

[manohar2375]

Hello Expertise,

Could you please help me with sample code to capture all ObjectIds within the Closed Polyline and transform/move them to new position at a time instead of one by one ObjectId in the same drawing. I know to transform one by one entity as below.

ent.TransformBy(Matrix3d.Displacement(new Vector3d(ptX, ptY, 0)));

But needs help to transform/move list of ObjectIds at a time in the same drawing.

Thanks in Advance.

[_gile]

Hi,

Simply use  a foreach loop.

[manohar2375]

Hi _gile,

Thanks for your reply with suggestion.

But, Is there any possibility to transform list of ObjectIds at a time without use foreach or any other loop.

Thanks in Advance.

[Ed__Jobe]

Put the foreach in a function method or an extension method and then it acts like a single step.

[manohar2375]

Hi Ed.Jobe,

Thanks for reply with suggestion.

But i am thinking that, drawing will get heavy load and get impact on performance if we use foreach, so thinking that, is there any other way to transform all at a time.

For Example:

to capture all elements, will use selection set as below.

PromptSelectionResult res = ed.SelectCrossingPolygon(pnt3dColl, filter);

so, like that, is there any other way.

Thanks in Advance.

[Ed__Jobe]

Even if you found an AutoCAD api method that did it, how do you think they would do it? Somehow, at a base level, you have to process them one at a time. A foreach is the simplest method.

[essam-salah]

for loop will be faster than foreach

            var ids = res.Value.GetObjectIds();
            int count = ids.Length;
            Entity entity;

            var transform = Matrix3d.Displacement(new Vector3d(0, 0, 0));
            for (int i = 0; i < count; i++)
            {
                entity = ids[i].GetObject(OpenMode.ForWrite) as Entity;
                entity.TransformBy(transform);
            }

[_gile]

---

@essam-salah  a écrit :

for loop will be faster than foreach

---

Are you sure about this ?

Did you test-it by yourself ?

If so, I should be interseted by how much faster is it ?

Rather than worrying about whether 'for' is faster than 'foreach', it is better to start by optimizing what you repeat at each iteration inside the loop.
A direct cast:

entity = (Entity)ids[i].GetObject(OpenMode.ForWrite);

is faster than a 'try cast' (which should only be used in conjunction with a : if (entity != null) ...

entity = ids[i].GetObject(OpenMode.ForWrite) as Entity;

See this dicussion.

[essam-salah]

hi @_gile 

thanks for the tip about Try Cast i always find smth helpful in your posts,

i tried both methods and here is the result:

Command:
Command: neltao
Unknown command "NELTAO".  Press F1 for help.
Command: NETLOAD
Command: FORVSFOREACH
 entities count: 62,389.00
  try cast:
        foreach1: 436.00
        forloop: 356.00
  without try cast:
        foreach2: 370.00
        forloop2: 362.00
Command: FORVSFOREACH
 entities count: 62,389.00
  try cast:
        foreach1: 422.00
        forloop: 398.00
  without try cast:
        foreach2: 362.00
        forloop2: 365.00
Command: FORVSFOREACH
 entities count: 62,389.00
  try cast:
        foreach1: 413.00
        forloop: 370.00
  without try cast:
        foreach2: 377.00
        forloop2: 351.00
Command: FORVSFOREACH
 entities count: 62,389.00
  try cast:
        foreach1: 377.00
        forloop: 358.00
  without try cast:
        foreach2: 363.00
        forloop2: 402.00
Command: FORVSFOREACH
 entities count: 62,389.00
  try cast:
        foreach1: 365.00
        forloop: 350.00
  without try cast:
        foreach2: 370.00
        forloop2: 373.00

        [CommandMethod("ForVsForeach")]
        public void ForAndForeach()
        {
            #region curr doc
            var adoc = Application.DocumentManager.MdiActiveDocument;
            var adb = adoc.Database;
            var editor = adoc.Editor;
            var cdoc = cApp.CivilApplication.ActiveDocument;
            #endregion
            Stopwatch stopWatch = new Stopwatch();


            var ids = editor.SelectAll().Value.GetObjectIds();
            int count = ids.Length;
            Entity entity;
            var transform = Matrix3d.Displacement(new Vector3d(22.22, 33.33, 0));
            editor.WriteMessage($"\n entities count: {count,0:#,0.00} \n");
            
            //////////////////////////////// try cast /////////////////////////////////////////////
            editor.WriteMessage($"\n\t try cast: \n");
            stopWatch.Reset();
            using (var tr = adb.TransactionManager.StartTransaction())
            {
                stopWatch.Start();
                foreach (var id in ids)
                {
                    entity = id.GetObject(OpenMode.ForWrite) as Entity;
                    entity.TransformBy(transform);
                }

                stopWatch.Stop();
                //tr.Commit();
            }
            editor.WriteMessage($"\n\t\t\t foreach1: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n");

            stopWatch.Reset();
            using (var tr = adb.TransactionManager.StartTransaction())
            {
                stopWatch.Start();
                for (int i = 0; i < count; i++)
                {
                    entity = ids[i].GetObject(OpenMode.ForWrite) as Entity;
                    entity.TransformBy(transform);
                }
                stopWatch.Stop();
                //tr.Commit();
            }
            editor.WriteMessage($"\n\n\t\t\t forloop: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n");

            ////////////////////////////////without try cast/////////////////////////////////////////////
            editor.WriteMessage($"\n\t without try cast: \n");
            stopWatch.Reset();
            using (var tr = adb.TransactionManager.StartTransaction())
            {
                stopWatch.Start();
                foreach (var id in ids)
                {
                    entity = (Entity)id.GetObject(OpenMode.ForWrite);
                    entity.TransformBy(transform);
                }

                stopWatch.Stop();
                //tr.Commit();
            }
            editor.WriteMessage($"\n\n\t\t\t foreach2: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n");

            stopWatch.Reset();
            using (var tr = adb.TransactionManager.StartTransaction())
            {
                stopWatch.Start();
                for (int i = 0; i < count; i++)
                {
                    entity = (Entity)ids[i].GetObject(OpenMode.ForWrite);
                    entity.TransformBy(transform);
                }
                stopWatch.Stop();
                //tr.Commit();
            }
            editor.WriteMessage($"\n\n\t\t\t forloop2: {stopWatch.ElapsedMilliseconds,0:#,0.00}\n\n");
        }