AutoCAD.Net 实现创建wipeout遮罩实体

1[CommandMethod("mywipeout")]
2        public static void mywipeout()
3        {
4            
5            // 获取当前文档和数据库
6            Document acDoc = Application.DocumentManager.MdiActiveDocument;
7            Database acCurDb = acDoc.Database;
8            // 启动事务
9            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
10            {
11                // 以读模式打开Block表
12                BlockTable acBlkTbl;
13                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
14                OpenMode.ForRead) as BlockTable;
15                // 以写模式打开Block表记录Model空间
16                BlockTableRecord acBlkTblRec;
17                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
18                OpenMode.ForWrite) as BlockTableRecord;
19                Point2dCollection pt2dArray = new Point2dCollection();
20                pt2dArray.Add(new Point2d(0, 0));
21                pt2dArray.Add(new Point2d(100, 0));
22                pt2dArray.Add(new Point2d(100, 100));
23                pt2dArray.Add(new Point2d(0, 100));
24                pt2dArray.Add(new Point2d(0, 0));//必须闭合
25                Wipeout wipeoutEnt = new Wipeout();
26                wipeoutEnt.SetFrom(pt2dArray, new Vector3d(0, 0, 1));
27                acBlkTblRec.AppendEntity(wipeoutEnt);
28                acTrans.AddNewlyCreatedDBObject(wipeoutEnt, true);
29                acTrans.Commit();
30            }
31        }