/// <summary>
        /// 调整viewPlan的尺寸并贴合选中房间
        /// change a viewPlan to fix the selected room
        /// </summary>
        /// <param name="view"></param>
        /// <param name="tran"></param>
        /// <param name="viewOffseet"></param>
        public void ChangeViewFitRoom(ViewPlan view, Transaction tran, double viewOffseet)
        {
            if (view == null)
            {
                TaskDialog.Show("viewIsNull", "Can't find the type of View.");
                return;
            }

            //获得并设定房间的边界设定,并获取其边界集
            DocSet.uidoc.ActiveView = view;
            SpatialElementBoundaryOptions opt = new SpatialElementBoundaryOptions();

            opt.SpatialElementBoundaryLocation = SpatialElementBoundaryLocation.Center;//房间边界设定,能变更获取的边界位置
            IList <IList <BoundarySegment> > segments = DocSet.selRoom.GetBoundarySegments(opt);

            if (segments == null)
            {
                TaskDialog.Show("segementsIsNull", "can't get the BoundarySegment of room");
                return;
            }


            ViewCropRegionShapeManager vcrShanpMgr = view.GetCropRegionShapeManager();

            CurveLoop loop = new CurveLoop();

            foreach (IList <BoundarySegment> segmentList in segments)
            {
                foreach (BoundarySegment segment in segmentList)
                {
                    Curve curve = segment.GetCurve();
                    loop.Append(curve);
                }


                bool cropValid = vcrShanpMgr.IsCropRegionShapeValid(loop);
                if (cropValid)
                {
                    //默认矩形
                    //TaskDialog.Show("cropValid", "the crop is shape Valid");
                    tran.Start("change the view crop region");
                    vcrShanpMgr.SetCropShape(loop);
                    tran.Commit();
                    tran.Start("Remove Crop Region Shape");
                    vcrShanpMgr.RemoveCropRegionShape();
                    tran.Commit();
                    //TaskDialog.Show("ChangeView", "ChangeViewdone");
                    break;
                }
            }

            tran.Start("loop offset");
            //TaskDialog.Show("!!!", "changeloop!");
            loop = CurveLoop.CreateViaOffset(vcrShanpMgr.GetCropShape().First(), -1 * viewOffseet / 300, new XYZ(0, 0, 1));
            vcrShanpMgr.SetCropShape(loop);
            tran.Commit();

            DocSet.uidoc.ActiveView = view;
        }