Revit二次开发——提取剖面视图中截面轮廓

问题

在之前的业务开发中，需要用户定义剖面视图，然后通过程序自动提取相应剖面的截面轮廓。但是，由于Revit项目文件中的模型都是体的概念，即使剖面视图中显示的是二维轮廓的形状，依旧无法通过API直接获取相应的截面曲线或者截面坐标点。

解决思路

但是经过一番思考，我们可以采用曲线救国的方案，可以先通过将剖面视图自动导出为CAD的dwg文件格式，然后再通过Teigha.Net的类库去解析dwg文件，来获取到截面轮廓的曲线对象数据。

代码实例

剖面视图导出

SelectViewSectionList为剖面视图对象ViewSection的数组，将其批量导出为dwg文件。

		private Result GetSectionForRevit(ExternalCommandData arg){var uidoc = arg.Application.ActiveUIDocument;var doc = uidoc.Document;for (int i = 0; i < this.SelectViewSectionList.Count; i++){string path = this.ExportDwgByIsolateElements(doc, (ViewSection)SelectViewSectionList[i]);this.ConvertSectionDwgToTidaCAD(path);}return Result.Succeeded;}private string ExportDwgByIsolateElements(Document doc, ViewSection view){if (view.IsTemporaryHideIsolateActive()){using (Transaction tx = new Transaction(doc)){tx.Start("Disable Temporary Isolate");view.DisableTemporaryViewMode(TemporaryViewMode.TemporaryHideIsolate);tx.Commit();}}string dllPath = this.GetType().Assembly.Location;string path = Path.GetDirectoryName(dllPath) + "\\" + view.Name + ".dwg";bool isSuccess = ExportView.ExportDWG(doc, view, path);if (!isSuccess){MessageBox.Show($"Revit输出{view.Name}图形失败");}return path;}

将Revit中Export函数进行简单的封装。

    public class ExportView {public static bool ExportDWG(Document document, Autodesk.Revit.DB.View view, string filePath){//导出设置选项DWGExportOptions exportOptions = new DWGExportOptions();exportOptions.FileVersion = ACADVersion.R2007;// Export the active viewICollection<ElementId> views = new List<ElementId>();views.Add(view.Id);// The document has to be saved already, therefore it has a valid PathName.bool exported = document.Export(Path.GetDirectoryName(filePath),Path.GetFileNameWithoutExtension(filePath), views, exportOptions);return exported;}}

解析Dwg文件

通过Teigha.Net类库解析dwg文件提取曲线信息，本案例采用的Teigha 3.09版本进行演示。

        private List<Curve> GetCurvesFromSectionDwg(string dwgPath) {ReadCADUtils readCADUtils = new ReadCADUtils();return readCADUtils.GetCADCurves(dwgPath);}

将Teigha提取的功能进行简单的封装。

	public class ReadCADUtils{/// 
/// 取得CAD里的线，包括直线、多段线、圆曲线/// /// /// public List<Curve> GetCADCurves(string dwgFile){List<Curve> result = new List<Curve>();using (new Services()){using (Database database = new Database(false, false)){database.ReadDwgFile(dwgFile, FileShare.Read, true, "");using (var trans = database.TransactionManager.StartTransaction()){using (BlockTable table = (BlockTable)database.BlockTableId.GetObject(OpenMode.ForRead)){using (SymbolTableEnumerator enumerator = table.GetEnumerator()){while (enumerator.MoveNext()){using (BlockTableRecord record = (BlockTableRecord)enumerator.Current.GetObject(OpenMode.ForRead)){foreach (ObjectId id in record){Entity entity = (Entity)id.GetObject(OpenMode.ForRead, false, false);switch (entity.GetRXClass().Name){case "AcDbPolyline":Teigha.DatabaseServices.Polyline pl = (Teigha.DatabaseServices.Polyline)entity;Polyline polyline = new Polyline();for (int i = 0; i < pl.NumberOfVertices; i++){polyline.AddVertexAt(polyline.NumberOfVertices, new Point3d(pl.GetPoint2dAt(i).X, pl.GetPoint2dAt(i).Y, 0), pl.GetBulgeAt(i));}result.Add(polyline);break;case "AcDbLine":Teigha.DatabaseServices.Line line = (Teigha.DatabaseServices.Line)entity;Point3d startPoint = new Point3d(line.StartPoint.X, line.StartPoint.Y, line.StartPoint.Z);Point3d endPoint = new Point3d(line.EndPoint.X, line.EndPoint.Y, line.EndPoint.Z);result.Add(new Line(startPoint, endPoint));break;case "AcDbArc":Teigha.DatabaseServices.Arc arc = (Teigha.DatabaseServices.Arc)entity;double enda, stara;if (arc.StartAngle > arc.EndAngle){enda = arc.StartAngle;stara = arc.EndAngle;}else{enda = arc.EndAngle;stara = arc.StartAngle;}Point3d center = new Point3d(arc.Center.X, arc.Center.Y, arc.Center.Z);result.Add(Arc.CreateArc(center, arc.Radius, stara, enda));break;default:break;}}}}}}}}}return result;}}

其他

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