Revit二次开发之技能篇（四）———区域标高不一致缩略图的实现

使用Revit出图时，往往会遇到项目地库标高不一致，在标注机电管线时，需要按照地库地面标高去标注，但地库地面标高又无法统一，需要手动取框选区域形成标高缩略图注明标高。

本文简单分享一下利用土建模型中的楼板实现缩略图的快速方法；

1、读取地库建筑面层的所有轮廓，筛选出建筑面层的范围线，利用范围线生成详图线；

2、新建常规注释类别的标高标记族，将建筑面层的标高赋值给常规注释族；

以下是所有代码：

 public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            UIApplication uiApp = commandData.Application;
            UIDocument uiDoc = uiApp.ActiveUIDocument;
            Document doc = uiDoc.Document;
            Selection sel = uiDoc.Selection;

            try {
                Transaction trans = new Transaction(doc);
                trans.Start("绘制详图线");
                FilteredElementCollector col = new FilteredElementCollector(uiDoc.Document);
                col.OfClass(typeof(FamilySymbol)).OfCategory(BuiltInCategory.OST_GenericAnnotation);
                FamilySymbol familySymbol = col.FirstElement() as FamilySymbol;
                FilteredElementCollector collector = new FilteredElementCollector(doc);
                ICollection floorcol = collector.OfClass(typeof(Floor)).ToElements();
                foreach (Element elem in floorcol) {
                    Floor floor = elem as Floor;
                    if (floor.Name.Contains("楼板"))
                    {

                        Level level = doc.GetElement(floor.LevelId) as Level;
                        if (level.Name.Contains("B1") && level.Name.Contains("ST"))
                        {
                            //获得楼板的相对标高；
                            double offset = floor.LookupParameter("自标高的高度偏移").AsDouble();
                            double levelHeigh = (level.Elevation + offset) * 304.8/1000;
                            string levelParam = levelHeigh.ToString("0.000");
                            XYZ point = (floor.get_BoundingBox(doc.ActiveView).Max+floor.get_BoundingBox(doc.ActiveView).Min)/2;

                            FamilyInstance instance = doc.Create.NewFamilyInstance(point, familySymbol, doc.ActiveView);

                            Parameter parm = instance.LookupParameter("标高1");
                            parm.Set(levelParam);

                            GeometryElement geometry = floor.get_Geometry(new Options());
                            foreach (GeometryObject geomObj in geometry)//获取到几何元素的边和面
                            {
                                Solid geomSolid = geomObj as Solid;
                                if (null != geomSolid)
                                {
                                    foreach (Face geoFace in geomSolid.Faces)
                                    {
                                        if (geoFace is PlanarFace) {
                                            PlanarFace plFace = geoFace as PlanarFace;

                                            //得到楼板面
                                            if (plFace.FaceNormal.Z == 1)
                                            {
                                              
                                                EdgeArray array = plFace.EdgeLoops.get_Item(0);

                                                foreach (Edge ed in array)
                                                {
                                                    Curve curve = ed.AsCurve();
                                                   
                                                    doc.Create.NewDetailCurve(doc.ActiveView, curve);
                                                   
                                                }
                                            }

                                        }
                                       
                                    }

                                }


                            }

                           

                        }


                    }

                }
                trans.Commit();
            }
            catch (Autodesk.Revit.Exceptions.OperationCanceledException e) {
                return Result.Cancelled;


            }
            catch (Exception ex) {
                TaskDialog.Show("Revit",ex.Source+"\n"+ex.Message+"\n");

                return Result.Failed;
            }


            return Result.Succeeded;
        }

 

实际效果如下：

 

以上就是生成缩略图的简单方法，本方法对楼板的建模要求很高，如果土建模型楼板不完整或者重叠，需要手动取修改缩略图。

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