リージョンを BlockTableRecord オブジェクトに追加するには、Region オブジェクトのインスタンスを作成し、それを BlockTableRecord に追加します。BlockTableRecord オブジェクトに追加する前に、閉じたループを形成するオブジェクトに基づいて、リージョンを計算する必要があります。CreateFromCurves 関数は、オブジェクトの入力配列によって形成されるすべての閉じたループからリージョンを作成します。CreateFromCurves メソッドは、DBObjectCollection オブジェクトを受け取って返します。
AutoCAD は、閉じた 2D および平面 3D ポリラインを個別のリージョンに変換し、次に閉じた平面ループを形成するポリライン、線分、および曲線を変換します。3 つ以上の曲線が端点を共有しているときは、その結果のリージョンは、任意です。このため、実際に CreateFromCurves メソッドで複数のリージョンが作成されることがあります。作成された各リージョンを BlockTableRecord オブジェクトに追加する必要があります。
次の例では、単一の円からリージョンを作成します。
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
<CommandMethod("AddRegion")> _
Public Sub AddRegion()
'' 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 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 an in memory circle
Using acCirc As Circle = New Circle()
acCirc.Center = New Point3d(2, 2, 0)
acCirc.Radius = 5
'' Adds the circle to an object array
Dim acDBObjColl As DBObjectCollection = New DBObjectCollection()
acDBObjColl.Add(acCirc)
'' Calculate the regions based on each closed loop
Dim myRegionColl As DBObjectCollection = New DBObjectCollection()
myRegionColl = Region.CreateFromCurves(acDBObjColl)
Dim acRegion As Region = myRegionColl(0)
'' Add the new object to the block table record and the transaction
acBlkTblRec.AppendEntity(acRegion)
acTrans.AddNewlyCreatedDBObject(acRegion, True)
'' Dispose of the in memory object not appended to the database
End Using
'' Save the new object to the database
acTrans.Commit()
End Using
End Sub
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
[CommandMethod("AddRegion")]
public static void AddRegion()
{
// 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 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 an in memory circle
using (Circle acCirc = new Circle())
{
acCirc.Center = new Point3d(2, 2, 0);
acCirc.Radius = 5;
// Adds the circle to an object array
DBObjectCollection acDBObjColl = new DBObjectCollection();
acDBObjColl.Add(acCirc);
// Calculate the regions based on each closed loop
DBObjectCollection myRegionColl = new DBObjectCollection();
myRegionColl = Region.CreateFromCurves(acDBObjColl);
Region acRegion = myRegionColl[0] as Region;
// Add the new object to the block table record and the transaction
acBlkTblRec.AppendEntity(acRegion);
acTrans.AddNewlyCreatedDBObject(acRegion, true);
// Dispose of the in memory circle not appended to the database
}
// Save the new object to the database
acTrans.Commit();
}
}
Sub AddRegion()
' Define an array to hold the
' boundaries of the region.
Dim curves(0 To 0) As AcadCircle
' Create a circle to become a
' boundary for the region.
Dim center(0 To 2) As Double
Dim radius As Double
center(0) = 2
center(1) = 2
center(2) = 0
radius = 5#
Set curves(0) = ThisDrawing.ModelSpace.AddCircle _
(center, radius)
' Create the region
Dim regionObj As Variant
regionObj = ThisDrawing.ModelSpace.AddRegion(curves)
ZoomAll
End Sub