选择CAD模型空间中多段线，在指定的布局中创建视口，方法如下：
1 /// <summary> 2 /// 创建视口 3 /// </summary> 4 /// <param name="roundLine">模型空间多段线</param> 5 /// <param name="curentLayout">当前布局名称</param> 6 /// <param name="insertPoint">布局空间视口插入点</param> 7 /// <param name="scale">缩放比例</param> 8 private void MakeViewport(Polyline roundLine, string curentLayout, Point3d insertPoint, double scale) 9 { 10 Database db = HostApplicationServices.WorkingDatabase; 11 using (Transaction tran = db.TransactionManager.StartTransaction()) 12 { 13 BlockTable bt = tran.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable; 14 BlockTableRecord btr = tran.GetObject(bt[BlockTableRecord.PaperSpace], OpenMode.ForWrite) as BlockTableRecord; 15 16 Polyline bound = roundLine.Clone() as Polyline; 17 bound.Closed = true; 18 Point3d maxPoint = bound.GeometricExtents.MaxPoint; 19 Point3d minPoint = bound.GeometricExtents.MinPoint; 20 Point3d centerPoint = new Point3d((maxPoint.X + minPoint.X) / 2, (maxPoint.Y + minPoint.Y) / 2, 0); 21 bound.TransformBy(Matrix3d.Scaling(scale, centerPoint)); 22 bound.TransformBy(Matrix3d.Displacement(centerPoint.GetVectorTo(insertPoint))); 23 btr.AppendEntity(bound); 24 tran.AddNewlyCreatedDBObject(bound, true); 25 26 Viewport vp = new Viewport(); 27 btr.AppendEntity(vp); 28 tran.AddNewlyCreatedDBObject(vp, true); 29 vp.NonRectClipEntityId = bound.Id; 30 31 vp.CenterPoint = insertPoint; //视口插入位置 32 vp.ViewCenter = new Point2d(centerPoint.X, centerPoint.Y); //模型空间中心位置 33 34 vp.ViewHeight = maxPoint.Y - minPoint.Y; //模型空间高度 35 vp.Height = scale * vp.ViewHeight; //视口高度 36 vp.NonRectClipOn = true; 37 vp.Locked = true; 38 vp.On = true; 39 tran.Commit(); 40 } 41 }