/// <summary>

         /// 创建视口

         /// </summary>

         /// <param name="roundLine">模型空间多段线</param>

         /// <param name="curentLayout">当前布局名称</param>

         /// <param name="insertPoint">布局空间视口插入点</param>

         /// <param name="scale">缩放比例</param>

         private void MakeViewport(Polyline roundLine, string curentLayout, Point3d insertPoint, double scale)

         {

             Database db = HostApplicationServices.WorkingDatabase;

             using (Transaction tran = db.TransactionManager.StartTransaction())

             {

                 BlockTable bt = tran.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;

                 BlockTableRecord btr = tran.GetObject(bt[BlockTableRecord.PaperSpace], OpenMode.ForWrite) as BlockTableRecord;

                 Polyline bound =  roundLine.Clone() as Polyline;

                 bound.Closed = true;

                 Point3d maxPoint = bound.GeometricExtents.MaxPoint;

                 Point3d minPoint = bound.GeometricExtents.MinPoint;

                 Point3d centerPoint = new Point3d((maxPoint.X + minPoint.X) / , (maxPoint.Y + minPoint.Y) / , );

                 bound.TransformBy(Matrix3d.Scaling(scale, centerPoint));

                 bound.TransformBy(Matrix3d.Displacement(centerPoint.GetVectorTo(insertPoint)));

                 btr.AppendEntity(bound);

                 tran.AddNewlyCreatedDBObject(bound, true);

                 Viewport vp = new Viewport();

                 btr.AppendEntity(vp);

                 tran.AddNewlyCreatedDBObject(vp, true);

                 vp.NonRectClipEntityId = bound.Id;

                 vp.CenterPoint = insertPoint;  //视口插入位置

                 vp.ViewCenter = new Point2d(centerPoint.X, centerPoint.Y); //模型空间中心位置

                 vp.ViewHeight = maxPoint.Y - minPoint.Y; //模型空间高度

                 vp.Height = scale * vp.ViewHeight;  //视口高度

                 vp.NonRectClipOn = true;

                 vp.Locked = true;

                 vp.On = true;

                 tran.Commit();

             }

         }