画層をフリーズすると、表示の更新速度を速くしてオブジェクトの選択処理が向上し、複雑な図面の再描画時間を短縮できます。フリーズした画層上のオブジェクトは表示、印刷、または再作図されません。長期間使用しない画層をフリーズします。画層を「フリーズ解除」すると、AutoCAD はその画層上のオブジェクトを再描画して表示します。
画層をフリーズまたはフリーズ解除するには、IsFrozen プロパティを使用します。TRUE を入力すると、その画層はフリーズされます。FALSE を入力すると、その画層はフリーズ解除されます。
次の例は、"ABC" という新しい画層を作成し、次にその画層をフリーズします。
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
<CommandMethod("FreezeLayer")> _
Public Sub FreezeLayer()
'' 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"
If acLyrTbl.Has(sLayerName) = False Then
Using acLyrTblRec As LayerTableRecord = New LayerTableRecord()
'' Assign the layer a name
acLyrTblRec.Name = sLayerName
'' Freeze the layer
acLyrTblRec.IsFrozen = True
'' Upgrade the Layer table for write
acTrans.GetObject(acCurDb.LayerTableId, OpenMode.ForWrite)
'' Append the new layer to the Layer table and the transaction
acLyrTbl.Add(acLyrTblRec)
acTrans.AddNewlyCreatedDBObject(acLyrTblRec, True)
End Using
Else
Dim acLyrTblRec As LayerTableRecord = acTrans.GetObject(acLyrTbl(sLayerName), _
OpenMode.ForWrite)
'' Freeze the layer
acLyrTblRec.IsFrozen = True
End If
'' 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;
[CommandMethod("FreezeLayer")]
public static void FreezeLayer()
{
// Get the current document and database
Document acDoc = Application.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
// Start a transaction
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
// Open the Layer table for read
LayerTable acLyrTbl;
acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
OpenMode.ForRead) as LayerTable;
string sLayerName = "ABC";
if (acLyrTbl.Has(sLayerName) == false)
{
using (LayerTableRecord acLyrTblRec = new LayerTableRecord())
{
// Assign the layer a name
acLyrTblRec.Name = sLayerName;
// Freeze the layer
acLyrTblRec.IsFrozen = true;
// Upgrade the Layer table for write
acTrans.GetObject(acCurDb.LayerTableId, OpenMode.ForWrite);
// Append the new layer to the Layer table and the transaction
acLyrTbl.Add(acLyrTblRec);
acTrans.AddNewlyCreatedDBObject(acLyrTblRec, true);
}
}
else
{
LayerTableRecord acLyrTblRec = acTrans.GetObject(acLyrTbl[sLayerName],
OpenMode.ForWrite) as LayerTableRecord;
// Freeze the layer
acLyrTblRec.IsFrozen = true;
}
// Save the changes and dispose of the transaction
acTrans.Commit();
}
}
Sub FreezeLayer()
' Create a new layer called "ABC"
Dim layerObj As AcadLayer
Set layerObj = ThisDrawing.Layers.Add("ABC")
' Freeze layer "ABC"
layerObj.Freeze = True
End Sub