一、思路

1）先创建圆形楼板（source floor）,获取楼板的轮廓，根据轮廓在目标楼板上开洞。

2）删掉圆形楼板。

注意：创建目标楼板 和 在目标楼板上开圆形洞，尽量不要在一个事务中

二、图示

三、代码

public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements){try {UIDocument uiDoc = commandData.Application.ActiveUIDocument;Document doc = uiDoc.Document;Selection sel = uiDoc.Selection;Autodesk.Revit.Creation.Application acreation = commandData.Application.Application.Create;Autodesk.Revit.Creation.Document dcreation = doc.Create;double l = 5;double w = 10;double x0 = 0;double y0 = 0;double z0 = 1;XYZ p_s0 = new XYZ(x0, y0, z0);XYZ p_s1 = new XYZ(x0, y0 + w, z0);XYZ p_s2 = new XYZ(x0 + l, y0 + w, z0);XYZ p_s3 = new XYZ(x0 + l, y0, z0);Line l_s0 = Line.CreateBound(p_s0, p_s1);Line l_s1 = Line.CreateBound(p_s1, p_s2);Line l_s2 = Line.CreateBound(p_s2, p_s3);Line l_s3 = Line.CreateBound(p_s3, p_s0);CurveArray fProfile = new CurveArray();fProfile.Append(l_s0);fProfile.Append(l_s1);fProfile.Append(l_s2);fProfile.Append(l_s3);//1)创建目标楼板Floor targetfloor = CreateTargetFloor(doc, fProfile);Transaction ts = new Transaction(doc, "createopenning");ts.Start();//2)创建圆形楼板XYZ center = new XYZ(2.5, 5, z0);Floor ciclefloor = CreateCircleFloor(doc, z0, center);//3)获取圆形楼板轮廓，并开洞CreateOpening(doc, ciclefloor, targetfloor);mit();return Result.Succeeded;} catch (Exception ex) {var r = 0;return Result.Succeeded;}}private Floor CreateTargetFloor(Document doc, CurveArray fProfile){Transaction ts = new Transaction(doc, "createfloor");ts.Start();var floor = doc.Create.NewFloor(fProfile, true);mit();return floor;}private Floor CreateCircleFloor(Document doc,double z,XYZ center){double radius = 2;Arc arc1 = Arc.Create(Plane.CreateByNormalAndOrigin(new XYZ(0, 0, 1), new XYZ(0, 0, 0)), radius, 0, Math.PI);Arc arc2 = Arc.Create(Plane.CreateByNormalAndOrigin(new XYZ(0, 0, 1), new XYZ(0, 0, 0)), radius, Math.PI, Math.PI * 2);CurveArray profile = new CurveArray();profile.Append(arc1);profile.Append(arc2);var floor = doc.Create.NewFloor(profile, false);//创建的圆弧位于原点，需要移动到开洞中心ElementTransformUtils.MoveElement(doc, floor.Id, center);return floor;}private void CreateOpening(Document doc, Floor sourceFloor, Floor destFloor){var floorGeometryElement = sourceFloor.get_Geometry(new Options());foreach (var geometryObject in floorGeometryElement) {var floorSolid = geometryObject as Solid;if (floorSolid == null)continue;var topFace = GetTopFace(floorSolid);if (topFace == null)throw new NotSupportedException("Floor does not have top face");if (topFace.EdgeLoops.IsEmpty)throw new NotSupportedException("Floor top face does not have edges");//圆形楼板的外轮廓EdgeArray ea = topFace.EdgeLoops.get_Item(0);CurveArray openingCurveArray = new CurveArray();foreach (Edge edge in ea) {var edgeCurve = edge.AsCurve();openingCurveArray.Append(edgeCurve);}var opening = sourceFloor.Document.Create.NewOpening(destFloor, openingCurveArray, true);destFloor.Document.Delete(sourceFloor.Id);}}const double _eps = 1.0e-9;private static PlanarFace GetTopFace(Solid solid){PlanarFace topFace = null;FaceArray faces = solid.Faces;foreach (Face f in faces) {PlanarFace pf = f as PlanarFace;if (null != pf && (Math.Abs(pf.FaceNormal.X - 0) < _eps && Math.Abs(pf.FaceNormal.Y - 0) < _eps)) {if ((null == topFace)|| (topFace.Origin.Z < pf.Origin.Z)) {topFace = pf;}}}return topFace;}

四、参考文献

Create a Floor with an Opening or Complex Boundary