03-05 创建和编辑AutoCAD实体（五） 使用图层、颜色和线型（1）

1.8、Assign a Linetype to a Layer指定图层线型

When you are defining layers,linetypes provide another way to convey visual information. A linetype is a repeating pattern of dashes,dots,and blank spaces you can use to distinguish the purpose of one line from another.

定义图层时，线型提供了传达视觉信息的另一个手段。线型是划线、点及空格的重复图案，可以用来区分不同线条的作用。

The linetype name and definition describe the particular dash-dot sequence,the relative lengths of dashes and blank spaces,and the characteristics of any included text or shapes.

线型名称和定义描述了不同线型的点划序列、划线或空白的相对长度、包含的文字或形状的特性等。

Use the Linetype property to assign a linetype to a layer. This property takes the name of the linetype as input.

使用Linetype属性来设置图层的线型，该属性以线型名作为输入参数。

Note Before a linetype can be assigned to a layer it must be defined in the drawing first. For information on working with linetypes,seeWork with Linetypes.

注意：线型赋给图层前必须先在图形中定义。关于使用线型的内容，见AutoCAD用户指南中的“使用线型”。

The following example creates a new layer named "ABC" and assigns it the "Center" linetype.

下面示例创建一个名为“ABC”的新图层，设置该图层线型为“Center”。

VB.NET

Imports Autodesk.AutoCAD.Runtime

Imports Autodesk.AutoCAD.ApplicationServices

Imports Autodesk.AutoCAD.DatabaseServices

<CommandMethod("SetLayerLinetype")> _

Public Sub SetLayerLinetype()

'' 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()

'' Open the Layer table for read

Dim acLyrTbl As LayerTable

acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,_

OpenMode.ForRead)

Dim sLayerName As String = "ABC"

Dim acLyrTblRec As LayerTableRecord

If acLyrTbl.Has(sLayerName) = False Then

acLyrTblRec = New LayerTableRecord()

'' Assign the layer a name

acLyrTblRec.Name = sLayerName

'' Upgrade the Layer table for write

acLyrTbl.UpgradeOpen()

'' Append the new layer to the Layer table and the transaction

acLyrTbl.Add(acLyrTblRec)

acTrans.AddNewlyCreatedDBObject(acLyrTblRec,True)

Else

acLyrTblRec = acTrans.GetObject(acLyrTbl(sLayerName),_

OpenMode.ForRead)

End If

'' Open the Layer table for read

Dim acLinTbl As LinetypeTable

acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId,_

OpenMode.ForRead)

If acLinTbl.Has("Center") = True Then

'' Upgrade the Layer Table Record for write

acLyrTblRec.UpgradeOpen()

'' Set the linetype for the layer

acLyrTblRec.LinetypeObjectId = acLinTbl("Center")

End If

'' Save the changes and dispose of the transaction

acTrans.Commit()

End Using

End Sub

C#

using Autodesk.AutoCAD.Runtime;

using Autodesk.AutoCAD.ApplicationServices;

using Autodesk.AutoCAD.DatabaseServices;

[CommandMethod("SetLayerLinetype")]

public static void SetLayerLinetype()

{

// Get the current document and database获取当前文档和数据库

Document acDoc = Application.DocumentManager.MdiActiveDocument;

Database acCurDb = acDoc.Database;

// Start a transaction启动事务

using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())

{

// Open the Layer table for read以读打开图层表

LayerTable acLyrTbl;

acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,OpenMode.ForRead) as LayerTable;

string sLayerName = "ABC";

LayerTableRecord acLyrTblRec;

if (acLyrTbl.Has(sLayerName) == false)

{

acLyrTblRec = new LayerTableRecord();

// Assign the layer a name图层名称

acLyrTblRec.Name = sLayerName;

// Upgrade the Layer table for write升级打开图层表

acLyrTbl.UpgradeOpen();

// Append the new layer to the Layer table and the transaction将新图层添加到图层表，登记事务记录

acLyrTbl.Add(acLyrTblRec);

acTrans.AddNewlyCreatedDBObject(acLyrTblRec,true);

}

else

{

acLyrTblRec = acTrans.GetObject(acLyrTbl[sLayerName],

OpenMode.ForRead) as LayerTableRecord;

}

// Open the Layer table for read以读打开块表

LinetypeTable acLinTbl;

acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId,

OpenMode.ForRead) as LinetypeTable;

if (acLinTbl.Has("Center") == true)

{

// Upgrade the Layer Table Record for write升级打开图层表记录

acLyrTblRec.UpgradeOpen();

// Set the linetype for the layer设置图层线型

acLyrTblRec.LinetypeObjectId = acLinTbl["Center"];

}

// Save the changes and dispose of the transaction保存修改关闭事务

acTrans.Commit();

}

}

VBA/ActiveX Code Reference

Sub SetLayerLinetype()

On Error Resume Next

Dim layerObj As AcadLayer

Set layerObj = ThisDrawing.Layers.Add("ABC")

layerObj.Linetype = "Center"

End Sub

（编辑：李大同）

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