指定线型比例 （.NET）

您可以为创建的对象指定线型比例。比例越小，每个绘图单元生成的图案重复次数就越多。默认情况下，AutoCAD 使用全局线型比例 1.0，它等于一个图形单位。可以更改所有图形对象和属性参照的线型比例。

CELTSCALE 系统变量为新创建的对象设置线型比例。LTSCALE 系统变量会更改现有对象和新对象的全局线型刻度。对象上的属性用于更改对象的线型刻度。显示对象的线型比例基于单个对象的线型比例乘以全局线型比例。LinetypeScale

更改对象的线型比例

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
 
<CommandMethod("SetObjectLinetypeScale")> _
Public Sub SetObjectLinetypeScale()
    '' Get the current document and database
    Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
    Dim acCurDb As Database = acDoc.Database

    '' Start a transaction
    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()

        '' Save the current linetype
        Dim acObjId As ObjectId = acCurDb.Celtype

        '' Set the global linetype scale
        acCurDb.Ltscale = 3

        '' Open the Linetype table for read
        Dim acLineTypTbl As LinetypeTable
        acLineTypTbl = acTrans.GetObject(acCurDb.LinetypeTableId, _
                                         OpenMode.ForRead)

        Dim sLineTypName As String = "Border"

        If acLineTypTbl.Has(sLineTypName) = False Then
            acCurDb.LoadLineTypeFile(sLineTypName, "acad.lin")
        End If

        '' Set the Border linetype current
        acCurDb.Celtype = acLineTypTbl(sLineTypName)

        '' Open the Block table for read
        Dim acBlkTbl As BlockTable
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _
                                     OpenMode.ForRead)

        '' Open the Block table record Model space for write
        Dim acBlkTblRec As BlockTableRecord
        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Create a circle object and set its linetype
        '' scale to half of full size
        Using acCirc1 As Circle = 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 acCirc2 As Circle = New Circle()
                acCirc2.Center = New Point3d(12, 2, 0)
                acCirc2.Radius = 4

                acBlkTblRec.AppendEntity(acCirc2)
                acTrans.AddNewlyCreatedDBObject(acCirc2, True)
            End Using
        End Using

        '' Restore the original active linetype
        acCurDb.Celtype = acObjId

        '' Save the changes and dispose of the transaction
        acTrans.Commit()
    End Using
End Sub

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();
    }
}

Sub SetObjectLinetypeScale()
    ' Save the current linetype
    Dim currLineType As AcadLineType
    Set currLineType = ThisDrawing.ActiveLinetype
 
    ' Set global linetype scale
    ThisDrawing.SetVariable "LTSCALE", 3
 
    ' Load the Border linetype
    On Error Resume Next
    If Not IsObject(ThisDrawing.Linetypes.Item("Border")) Then
      ThisDrawing.Linetypes.Load "Border", "acad.lin"
    End If
 
    ThisDrawing.ActiveLinetype = ThisDrawing.Linetypes.Item("BORDER")
 
    ' Create a circle object in model space
    Dim center(0 To 2) As Double
    center(0) = 2: center(1) = 2: center(2) = 0
 
    Dim circleObj1 As AcadCircle
    Set circleObj1 = ThisDrawing.ModelSpace.AddCircle(center, 4)
 
    ' Set the linetype scale of the circle to half of full size
    circleObj1.LinetypeScale = 0.5
    circleObj1.Update
 
    Dim circleObj2 As AcadCircle
    center(0) = center(0) + 10
    Set circleObj2 = ThisDrawing.ModelSpace.AddCircle(center, 4)
    circleObj2.Update
 
    ' Restore original active linetype
    ThisDrawing.ActiveLinetype = currLineType
End Sub