在Revit中读取、隐藏并绘制CAD线 |
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使用环境：Revit 2016、Revit2017（其他版本自测）
市面上有很多Revit插件具备翻模的功能，其基本功能就是将CAD中二维符号转换成Revit中的三维构件，为了实现这个功能，基本可以分为以下几步： 1、将CAD的dwg格式的文件导入到Revit中； 2、选择dwg中的某个图层； 3、隐藏图层； 4、读取图层中所有几何信息，生成三维构件。 明确了任务后，就来看看具体的实现。我们知道，将CAD的dwg文件导入到Revit后，将以一个类似“块”的方式在Revit中显示，元素名是ImportInstance，怎么读取其中的几何信息是我们非常关心的。 importinstance中保留了CAD中的图层，可以通过查询的方式来查看某根线的图层名，RevitAPI提供了PickObject（ObjectType）方法选择元素，在这里使用ObjectType.PointOnElement进行选择，得到了reference后就可以做很多事。一个图层对应revit中的一个Category，在“视图”>“可见性/图形”>“导入类别”可以设置图层的显示隐藏，话不多说直接上代码。（感觉打字好累啊，实现思路具体看代码！） using Autodesk.Revit.ApplicationServices; using Autodesk.Revit.DB; using Autodesk.Revit.UI; using Autodesk.Revit.UI.Selection; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace JohnnyCoder.CAD { [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)] class ReadCadCommand : IExternalCommand { Application app; Document doc; public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements) { UIDocument uidoc = commandData.Application.ActiveUIDocument; app = commandData.Application.Application; doc = uidoc.Document; //Reference refer = uidoc.Selection.PickObject(ObjectType.Element, "Select a CAD Link"); //Element elem = doc.GetElement(refer); //GeometryElement geoElem = elem.get_Geometry(new Options()); Reference r = uidoc.Selection.PickObject(ObjectType.PointOnElement); string ss = r.ConvertToStableRepresentation(doc); Element elem = doc.GetElement(r); GeometryElement geoElem = elem.get_Geometry(new Options()); GeometryObject geoObj = elem.GetGeometryObjectFromReference(r); //获取选中的cad图层 Category targetCategory = null; ElementId graphicsStyleId = null; if (geoObj.GraphicsStyleId != ElementId.InvalidElementId) { graphicsStyleId = geoObj.GraphicsStyleId; GraphicsStyle gs = doc.GetElement(geoObj.GraphicsStyleId) as GraphicsStyle; if (gs != null) { targetCategory = gs.GraphicsStyleCategory; var name = gs.GraphicsStyleCategory.Name; } } //隐藏选中的cad图层 Transaction trans = new Transaction(doc, "隐藏图层"); trans.Start(); if (targetCategory != null) doc.ActiveView.SetVisibility(targetCategory, false); trans.Commit(); TransactionGroup transGroup = new TransactionGroup(doc, "绘制模型线"); transGroup.Start(); CurveArray curveArray = new CurveArray(); //判断元素类型 foreach (var gObj in geoElem) { GeometryInstance geomInstance = gObj as GeometryInstance; //坐标转换。如果选择的是“自动-中心到中心”，或者移动了importInstance，需要进行坐标转换 Transform transform = geomInstance.Transform; if (null != geomInstance) { foreach (var insObj in geomInstance.SymbolGeometry) { if (insObj.GraphicsStyleId.IntegerValue != graphicsStyleId.IntegerValue) continue; if (insObj.GetType().ToString() == "Autodesk.Revit.DB.NurbSpline") { //未实现 } if (insObj.GetType().ToString() == "Autodesk.Revit.DB.Line") { Line line = insObj as Line; XYZ normal = XYZ.BasisZ; XYZ point = line.GetEndPoint(0); point = transform.OfPoint(point); curveArray.Append(TransformLine(transform, line)); CreateModelCurveArray(curveArray, normal, point); } if (insObj.GetType().ToString() == "Autodesk.Revit.DB.Arc") { //未实现 } if (insObj.GetType().ToString() == "Autodesk.Revit.DB.PolyLine") { PolyLine polyLine = insObj as PolyLine; IList points = polyLine.GetCoordinates(); for (int i = 0; i < points.Count - 1; i++) { Line line = Line.CreateBound(points[i], points[i + 1]); line = TransformLine(transform, line); curveArray.Append(line); } XYZ normal = XYZ.BasisZ; XYZ point = points.First(); point = transform.OfPoint(point); CreateModelCurveArray(curveArray, normal, point); } } } } transGroup.Assimilate(); return Result.Succeeded; } private void CreateModelCurveArray(CurveArray curveArray, XYZ normal, XYZ point) { if (curveArray.Size > 0) { Transaction transaction2 = new Transaction(doc); transaction2.Start("绘制模型线"); try { SketchPlane modelSketch = SketchPlane.Create(doc, app.Create.NewPlane(normal, point)); ModelCurveArray modelLine = doc.Create.NewModelCurveArray(curveArray, modelSketch); } catch { } transaction2.Commit(); curveArray.Clear(); } } private Line TransformLine(Transform transform, Line line) { XYZ startPoint = transform.OfPoint(line.GetEndPoint(0)); XYZ endPoint = transform.OfPoint(line.GetEndPoint(1)); Line newLine = Line.CreateBound(startPoint, endPoint); return newLine; } } } |
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