1 // Created on: 1993-10-18
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 <HLRBRep_EdgeFaceTool.ixx>
18 #include <HLRBRep_Curve.hxx>
19 #include <HLRBRep_Surface.hxx>
20 #include <BRepExtrema_ExtPF.hxx>
21 #include <BRepLib_MakeVertex.hxx>
22 #include <BRep_Tool.hxx>
23 #include <BRepAdaptor_Curve2d.hxx>
24 #include <TopoDS_Vertex.hxx>
27 //=======================================================================
28 //function : CurvatureDirection
30 //=======================================================================
32 Standard_Real HLRBRep_EdgeFaceTool::CurvatureValue
33 (const Standard_Address F,
34 const Standard_Real U,
35 const Standard_Real V,
39 gp_Vec D1U,D1V,D2U,D2V,D2UV;
40 ((HLRBRep_Surface*)F)->D2(U,V,P,D1U,D1V,D2U,D2V,D2UV);
41 Standard_Real d1ut = D1U*Tg;
42 Standard_Real d1vt = D1V*Tg;
43 Standard_Real d1ud1v = D1U*D1V;
44 Standard_Real nmu2 = D1U*D1U;
45 Standard_Real nmv2 = D1V*D1V;
46 Standard_Real det = nmu2 * nmv2 - d1ud1v * d1ud1v;
47 Standard_Real alfa = ( d1ut * nmv2 - d1vt * d1ud1v ) / det;
48 Standard_Real beta = ( d1vt * nmu2 - d1ut * d1ud1v ) / det;
49 gp_Vec Nm = D1U ^ D1V;
50 if (Nm.Magnitude() > gp::Resolution()) {
52 Standard_Real alfa2 = alfa*alfa;
53 Standard_Real beta2 = beta*beta;
54 Standard_Real alfabeta = alfa*beta;
55 Standard_Real N = (Nm*D2U)*alfa2 + 2*(Nm*D2UV)*alfabeta + (Nm*D2V)*beta2;
56 Standard_Real D = nmu2 *alfa2 + 2*d1ud1v *alfabeta + nmv2 *beta2;
62 //=======================================================================
65 //=======================================================================
67 Standard_Boolean HLRBRep_EdgeFaceTool::UVPoint(const Standard_Real Par,
68 const Standard_Address E,
69 const Standard_Address F,
73 Standard_Real pfbid,plbid;
74 if (BRep_Tool::CurveOnSurface
75 (((HLRBRep_Curve *)E)->Curve().Edge(),
76 ((HLRBRep_Surface*)F)->Surface().Face(),pfbid,plbid).IsNull())
78 BRepExtrema_ExtPF proj
79 (BRepLib_MakeVertex(((HLRBRep_Curve*)E)->Value3D(Par)),
80 ((HLRBRep_Surface*)F)->Surface().Face());
81 Standard_Integer i, index = 0;
82 Standard_Real dist2 = RealLast();
83 const Standard_Integer n = proj.NbExt();
84 for (i = 1; i <= n; i++) {
85 const Standard_Real newdist2 = proj.SquareDistance(i);
86 if (newdist2 < dist2) {
92 return Standard_False;
94 proj.Parameter(index,U,V);
97 BRepAdaptor_Curve2d PC
98 (((HLRBRep_Curve *)E)->Curve().Edge(),
99 ((HLRBRep_Surface*)F)->Surface().Face());
105 return Standard_True;