//-------------------------------------------------------------------------------------------------- bool _IsFaceOfBendSection(TopoDS_Face face, BendParameter bendParams) { if (bendParams == null) { bendParams = new BendParameter(); // Temporary usage } // Each face of a bend section has two circular edges var edges = face.Edges(); var foundCircularEdges = 0; foreach (var edge in edges) { var edgeAdaptor = new BRepAdaptor_Curve(edge); if (edgeAdaptor.GetGeomType() == GeomAbs_CurveType.GeomAbs_Circle) { foundCircularEdges++; if (bendParams.Edges[0] == null) { bendParams.Edges[0] = edge; bendParams.Axes[0] = edgeAdaptor.Circle().Position(); bendParams.Radii[0] = edgeAdaptor.Circle().Radius(); bendParams.AngleRad = edgeAdaptor.LastParameter() - edgeAdaptor.FirstParameter(); } else { if (!bendParams.Axes[0].Axis.IsCoaxial(edgeAdaptor.Circle().Axis(), 0.01f, 0.001f) || !bendParams.AngleRad.IsEqual(edgeAdaptor.LastParameter() - edgeAdaptor.FirstParameter(), 0.01)) { return(false); // Circular edge with unproper parameters detected } if (bendParams.Edges[1] == null) { // Second edge of bend surface bendParams.Edges[1] = edge; bendParams.Axes[1] = edgeAdaptor.Circle().Position(); break; } // Additional edges, find free place for (int edgeIndex = 0; edgeIndex < bendParams.Edges.Length; edgeIndex++) { if (bendParams.Edges[edgeIndex] == null) { bendParams.Edges[edgeIndex] = edge; break; } if (bendParams.Edges[edgeIndex].IsSame(edge)) { break; } } if (!edgeAdaptor.Circle().Radius().IsEqual(bendParams.Radii[0], 0.000001)) { bendParams.Radii[1] = edgeAdaptor.Circle().Radius(); } } } } // Coaxial circle edges not found, this is not a bend section if (foundCircularEdges != 2) { return(false); } return(true); }
/// <summary> /// Searches for the longest edge of a shape, and find the longest parallel edge /// </summary> public static (TopoDS_Edge edge, Ax1?axis, TopoDS_Edge opEdge, Ax1?opAxis) FindLongestEdge(TopoDS_Shape shape) { TopoDS_Edge foundEdge = null; Ax1? foundAxis = null; TopoDS_Edge opEdge = null; Ax1? opAxis = null; // Find the longest edge to revolve around double edgeLen = -1; var edgeInfos = new List <(TopoDS_Edge edge, double len, Ax1 axis)>(); var edges = shape.Edges(); foreach (var edge in edges) { var brepAdaptor = new BRepAdaptor_Curve(edge); if (brepAdaptor.GetGeomType() != GeomAbs_CurveType.GeomAbs_Line) { break; } var v1 = brepAdaptor.Value(brepAdaptor.FirstParameter()); var v2 = brepAdaptor.Value(brepAdaptor.LastParameter()); var len = v1.Distance(v2); var axis = new Ax1(v1, new Vec(v1, v2).ToDir()); if (edge.Orientation() == TopAbs_Orientation.TopAbs_REVERSED) { axis.Reverse(); } edgeInfos.Add((edge, len, axis)); if (foundEdge != null && foundEdge.IsSame(edge)) { // Same edge with another orientation if (foundEdge.Orientation() == TopAbs_Orientation.TopAbs_REVERSED && edge.Orientation() == TopAbs_Orientation.TopAbs_FORWARD) { // Prefer forward edges foundEdge = edge; } continue; } if (len > edgeLen) { foundEdge = edge; edgeLen = len; foundAxis = axis; } } if (foundAxis != null) { // Find opposite edge edgeLen = -1; foreach (var ei in edgeInfos) { if (ei.edge == foundEdge) { continue; } if (!ei.axis.IsParallel(foundAxis.Value, 0.00001)) { continue; } if (ei.len > edgeLen) { opEdge = ei.edge; edgeLen = ei.len; opAxis = ei.axis; } } } return(foundEdge, foundAxis, opEdge, opAxis); }