AutoCAD.Net 实现创建wipeout遮罩实体

 [CommandMethod("mywipeout")] ???????public static void mywipeout() ???????{ ???????????????????????// 获取当前文档和数据库 ???????????Document acDoc = Application.DocumentManager.MdiActiveDocument; ???????????Database acCurDb = acDoc.Database; ???????????// 启动事务 ???????????using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction()) ???????????{ ???????????????// 以读模式打开Block表 ???????????????BlockTable acBlkTbl; ???????????????acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, ???????????????OpenMode.ForRead) as BlockTable; ???????????????// 以写模式打开Block表记录Model空间 ???????????????BlockTableRecord acBlkTblRec; ???????????????acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace], ???????????????OpenMode.ForWrite) as BlockTableRecord; ???????????????Point2dCollection pt2dArray = new Point2dCollection(); ???????????????pt2dArray.Add(new Point2d(0, 0)); ???????????????pt2dArray.Add(new Point2d(100, 0)); ???????????????pt2dArray.Add(new Point2d(100, 100)); ???????????????pt2dArray.Add(new Point2d(0, 100)); ???????????????pt2dArray.Add(new Point2d(0, 0));//必须闭合 ???????????????Wipeout wipeoutEnt = new Wipeout(); ???????????????wipeoutEnt.SetFrom(pt2dArray, new Vector3d(0, 0, 1)); ???????????????acBlkTblRec.AppendEntity(wipeoutEnt); ???????????????acTrans.AddNewlyCreatedDBObject(wipeoutEnt, true); ???????????????acTrans.Commit(); ???????????} ???????}