1 // Created on: 1993-12-15
2 // Created by: Christophe MARION
3 // Copyright (c) 1993-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #include <BRepExtrema_ExtCF.hxx>
19 #include <BRep_Tool.hxx>
20 #include <BRepTools.hxx>
21 #include <Geom_Curve.hxx>
22 #include <BRepTopAdaptor_FClass2d.hxx>
23 #include <gp_Pnt2d.hxx>
24 #include <BRepAdaptor_Surface.hxx>
25 #include <BRepAdaptor_Curve.hxx>
27 //=======================================================================
28 //function : BRepExtrema_ExtCF
30 //=======================================================================
32 BRepExtrema_ExtCF::BRepExtrema_ExtCF(const TopoDS_Edge& E, const TopoDS_Face& F)
38 //=======================================================================
39 //function : Initialize
41 //=======================================================================
43 void BRepExtrema_ExtCF::Initialize(const TopoDS_Edge& E, const TopoDS_Face& F)
45 BRepAdaptor_Surface Surf(F);
46 if (Surf.GetType() == GeomAbs_OtherSurface ||
47 !BRep_Tool::IsGeometric(E))
48 return; // protect against non-geometric type (e.g. triangulation)
49 BRepAdaptor_Curve aC(E);
50 myHS = new BRepAdaptor_Surface(Surf);
51 Standard_Real aTolC, aTolS;
53 aTolS = Min(BRep_Tool::Tolerance(F), Precision::Confusion());
54 aTolS = Min(Surf.UResolution(aTolS), Surf.VResolution(aTolS));
55 aTolS = Max(aTolS, Precision::PConfusion());
57 aTolC = Min(BRep_Tool::Tolerance(E), Precision::Confusion());
58 aTolC = aC.Resolution(aTolC);
59 aTolC = Max(aTolC, Precision::PConfusion());
61 Standard_Real U1, U2, V1, V2;
62 BRepTools::UVBounds(F, U1, U2, V1, V2);
63 myExtCS.Initialize (*myHS, U1, U2, V1, V2, aTolC, aTolS);
66 //=======================================================================
69 //=======================================================================
71 void BRepExtrema_ExtCF::Perform(const TopoDS_Edge& E, const TopoDS_Face& F2)
78 return; // protect against non-geometric type (e.g. triangulation)
81 BRep_Tool::Range(E, U1, U2);
83 BRepAdaptor_Curve Curv(E);
84 Handle(BRepAdaptor_Curve) HC = new BRepAdaptor_Curve(Curv);
85 myExtCS.Perform(HC->Curve(), U1, U2);
90 if (myExtCS.IsParallel())
91 mySqDist.Append(myExtCS.SquareDistance(1));
94 // Exploration of points and classification
95 const Standard_Real Tol = BRep_Tool::Tolerance (F2);
96 BRepTopAdaptor_FClass2d classifier (F2, Tol);
98 // If the underlying surface of the face is periodic
99 // Extrema should return the point within the period,
100 // so there is no point to adjust it in classifier.
101 Standard_Boolean isAdjustPeriodic = Standard_False;
106 for (Standard_Integer i = 1; i <= myExtCS.NbExt(); i++)
108 myExtCS.Points(i, P1, P2);
109 P2.Parameter(U1, U2);
110 const gp_Pnt2d Puv(U1, U2);
111 const TopAbs_State state = classifier.Perform (Puv, isAdjustPeriodic);
112 if (state == TopAbs_ON || state == TopAbs_IN)
114 mySqDist.Append(myExtCS.SquareDistance(i));
115 myPointsOnC.Append(P1);
116 myPointsOnS.Append(P2);