Specify Linetype Scale (.NET)

You can specify the linetype scale for objects you create. The smaller the scale, the more repetitions of the pattern are generated per drawing unit. By default, AutoCAD uses a global linetype scale of 1.0, which is equal to one drawing unit. You can change the linetype scale for all drawing objects and attribute references.

The CELTSCALE system variable sets the linetype scale for newly created objects. LTSCALE system variable changes the global linetype scale of existing objects as well as new objects. The LinetypeScale property on an object is used to change the linetype scale for an object. The linetype scale at which an object is displayed at is based on the an individual object’s linetype scale multiplied by the global linetype scale.

Change the linetype scale for an object

C# Example

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
 
[CommandMethod("SetObjectLinetypeScale")]
public static void SetObjectLinetypeScale()
{
    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Save the current linetype
        ObjectId acObjId = acCurDb.Celtype;

        // Set the global linetype scale
        acCurDb.Ltscale = 3;

        // Open the Linetype table for read
        LinetypeTable acLineTypTbl;
        acLineTypTbl = acTrans.GetObject(acCurDb.LinetypeTableId,
                                         OpenMode.ForRead) as LinetypeTable;

        string sLineTypName = "Border";

        if (acLineTypTbl.Has(sLineTypName) == false)
        {
            acCurDb.LoadLineTypeFile(sLineTypName, "acad.lin");
        }

        // Set the Border linetype current
        acCurDb.Celtype = acLineTypTbl[sLineTypName];

        // Open the Block table for read
        BlockTable acBlkTbl;
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                     OpenMode.ForRead) as BlockTable;

        // Open the Block table record Model space for write
        BlockTableRecord acBlkTblRec;
        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Create a circle object and set its linetype
        // scale to half of full size
        using (Circle acCirc1 = new Circle())
        {
            acCirc1.Center = new Point3d(2, 2, 0);
            acCirc1.Radius = 4;
            acCirc1.LinetypeScale = 0.5;

            acBlkTblRec.AppendEntity(acCirc1);
            acTrans.AddNewlyCreatedDBObject(acCirc1, true);

            // Create a second circle object
            using (Circle acCirc2 = new Circle())
            {
                acCirc2.Center = new Point3d(12, 2, 0);
                acCirc2.Radius = 4;

                acBlkTblRec.AppendEntity(acCirc2);
                acTrans.AddNewlyCreatedDBObject(acCirc2, true);
            }
        }

        // Restore the original active linetype
        acCurDb.Celtype = acObjId;

        // Save the changes and dispose of the transaction
        acTrans.Commit();
    }
}