get bounding box

[a7v1n]

hi. how do you get the bounding box of a block in the drawing using vb.net? Can someone point me to the right direction? I'm going crazy over here. Thanks... Im using AutoCAD 2008 by the way. thanks Edited by: a7v1n on Apr 6, 2010 12:19 AM

[norman.yuan]

Check out BlockReference.GeometricExtents property and/or BlockReference.GeometricExtentsBestFit() method.

[06041983]

Hi, Norman!

I ask you, please, tell in detail how to do it, because we are new and do not know all the details. To me the answer could not help. I just lose my mind yet deal with that.

I hope you understand me, because I am from Russia and I find it hard to explain my problem, but the issue with GetBoundingBox me too important.

Please, if you have a solution to this problem, and describe it in detail. All the people you are only grateful.

[SENL1362]

        [CommandMethod("TestGetBlkRefExtents")]
        public void TestGetBlkRefExtents()
        {
            Document doc = null;
            Database db = null;
            Editor ed = null;

            string blkName = "MyBlk";
            Point3d insPnt = new Point3d(10, 20, 0);
            double rotInRad = 30 * (Math.PI / 180);
            double scaleFct = 2;
            try
            {
                doc = AcadApp.DocumentManager.MdiActiveDocument;
                if (doc == null)
                    return;
                db = doc.Database;
                ed = doc.Editor;


                //1. Insert Block in Modelspace
                ObjectId blkRefId = ObjectId.Null;
                using (Transaction tr=db.TransactionManager.StartTransaction())
                {
                    var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
                    var blkId = bt[blkName];
                    BlockReference blkRef=null;
                    if (bt.Has(blkName))
                    {
                        var ms = (BlockTableRecord)tr.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);
                        blkRef = new BlockReference(insPnt, blkId);
                        blkRef.SetDatabaseDefaults(db);
                        ms.UpgradeOpen();
                        ms.AppendEntity(blkRef);
                        tr.AddNewlyCreatedDBObject(blkRef, true);

                        if (rotInRad != 0)
                            blkRef.Rotation = rotInRad;

                        if (scaleFct != 1)
                            blkRef.ScaleFactors = new Scale3d(scaleFct);
                        blkRefId = blkRef.ObjectId;
                    }
                    tr.Commit();
                }
                if(blkRefId.IsNull)
                    throw new System.Exception("Failed to insert Block: " + blkName);


                //2. Get Block Extension
                using (Transaction tr = db.TransactionManager.StartTransaction())
                {
                    var blkRef = (BlockReference)tr.GetObject(blkRefId, OpenMode.ForRead);
                    Extents3d blkRefExt=blkRef.GeometricExtents;
                    ed.WriteMessage("\n BlockReference: {0}", blkName);
                    ed.WriteMessage("\n\t Position: {0}", blkRef.Position);
                    ed.WriteMessage("\n\t Rotation: {0}", blkRef.Rotation * (180/Math.PI ));
                    ed.WriteMessage("\n\t Scale: {0},{1},{2}", blkRef.ScaleFactors.X, blkRef.ScaleFactors.Y, blkRef.ScaleFactors.Z);
                    ed.WriteMessage("\n\t Size: {0}..{1}", blkRefExt.MinPoint, blkRefExt.MaxPoint);
                    tr.Commit();
                }


            }
            catch (System.Exception ex)
            {
                if (ed != null)
                    ed.WriteMessage("\n Error: " + ex.Message);
                else
                    MessageBox.Show("Error: " + ex.Message, "TestGetBlkRefExtents", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

[06041983]

Hi, -SENL1362-!

Thank you for answer and code.

Unfortunately I did not understand anything in it))) I'm still at a very early stage of education.

I understand this code (from AutoCAD ActiveX and VBA Reference):

Sub Example_GetBoundingBox()

    ' Этот пример строит в пространстве модели линию и определяет размеры области объекта
    Dim startPoint(0 To 2) As Double
    Dim endPoint(0 To 2) As Double
    Dim lineObj As AcadLine

    ' Создаем линию в пространстве модели (или определяем ее)
    startPoint(0) = 2#: startPoint(1) = 2#: startPoint(2) = 0#
    endPoint(0) = 4#: endPoint(1) = 4#: endPoint(2) = 0#
    Set lineObj = ThisDrawing.ModelSpace.AddLine(startPoint, endPoint)
    ZoomAll
    
    Dim minExt As Variant
    Dim maxExt As Variant
    
    ' Метод возвращает максимальную и минимальную точку области объекта
    lineObj.GetBoundingBox minExt, maxExt
    
    ' Печатаем минимальные и максимальные размеры области
    MsgBox "Текущие размеры объекта:" & vbCrLf _
         & "Min Extent: " & minExt(0) & "," & minExt(1) & "," & minExt(2) _
         & vbCrLf & "Max Extent: " & maxExt(0) & "," & maxExt(1) & "," & maxExt(2), vbInformation, "GetBoundingBox пример"
         
End Sub

Very easy: Create object in model space, get his bounding box and print in message box!

I do not understand the concept of AutoCAD NET API and this is sad 😞

Something like I've done with the help of "Using Autodesk.AutoCAD.Interop", but I have new problem: I can't show Form with report after it. 😞

Sad, sad and sad!

Where can I find a good explanation of the concept of AutoCAD NET API?

Thank you for your responsiveness!

[SENL1362]

AutoCAD .NET Developers Guide,  Author: Stephen

https://docs.google.com/document/d/1lwKk1eCci1-7sm8jqou5vLd5fLmml3hbeubnOZJHaWk/edit

[dgorsman]

If you start with AutoCAD without knowing the basics of VB.NET you'll basically be lost.  Find a good primer for that first.