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
'' 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)
'' Freeze the layer
acLyrTblRec.IsFrozen = 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;
// 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);
// Freeze the layer
acLyrTblRec.IsFrozen = 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