1 // Created on: 2016-05-10 2 // Created by: Alexander MALYSHEV 3 // Copyright (c) 1991-1999 Matra Datavision 4 // Copyright (c) 1999-2016 OPEN CASCADE SAS 5 // 6 // This file is part of Open CASCADE Technology software library. 7 // 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. 13 // 14 // Alternatively, this file may be used under the terms of Open CASCADE 15 // commercial license or contractual agreement. 16 17 #ifndef _Extrema_FuncPSDsit_HeaderFile 18 #define _Extrema_FuncPSDsit_HeaderFile 19 20 #include <Standard.hxx> 21 #include <Standard_DefineAlloc.hxx> 22 23 #include <math_MultipleVarFunctionWithGradient.hxx> 24 #include <gp_Pnt.hxx> 25 #include <Adaptor3d_Surface.hxx> 26 27 #include <Standard_Real.hxx> 28 #include <Standard_Boolean.hxx> 29 #include <Standard_Integer.hxx> 30 31 class math_Vector; 32 33 //! Functional for search of extremum of the square Euclidean distance between point P and 34 //! surface S, starting from approximate solution (u0, v0). 35 //! 36 //! The class inherits math_MultipleVarFunctionWithGradient and thus is intended 37 //! for use in math_BFGS algorithm. 38 //! 39 //! The criteria is: 40 //! F = SquareDist(P, S(u, v)) - > min 41 //! 42 //! The first derivative are: 43 //! F1(u,v) = (S(u,v) - P) * Su 44 //! F2(u,v) = (S(u,v) - P) * Sv 45 //! 46 //! Su and Sv are first derivatives of the surface, * symbol means dot product. 47 class Extrema_FuncPSDist : public math_MultipleVarFunctionWithGradient 48 { 49 public: 50 51 DEFINE_STANDARD_ALLOC 52 53 //! Constructor. 54 Standard_EXPORT Extrema_FuncPSDist(const Adaptor3d_Surface& theS, 55 const gp_Pnt& theP); 56 57 //! Number of variables. 58 Standard_EXPORT Standard_Integer NbVariables() const Standard_OVERRIDE; 59 60 //! Value. 61 Standard_EXPORT Standard_Boolean Value(const math_Vector& X,Standard_Real& F) Standard_OVERRIDE; 62 63 //! Gradient. 64 Standard_EXPORT Standard_Boolean Gradient(const math_Vector& X,math_Vector& G) Standard_OVERRIDE; 65 66 //! Value and gradient. 67 Standard_EXPORT Standard_Boolean Values(const math_Vector& X,Standard_Real& F,math_Vector& G) Standard_OVERRIDE; 68 69 private: 70 71 72 //! Check point is inside of the surface parameter space. 73 //! Returns true if inside and false otherwise. 74 Standard_Boolean IsInside(const math_Vector& X); 75 76 const Extrema_FuncPSDist& operator=(const Extrema_FuncPSDist&); 77 Extrema_FuncPSDist(const Extrema_FuncPSDist&); 78 79 const Adaptor3d_Surface &mySurf; 80 const gp_Pnt &myP; 81 }; 82 #endif // _Extrema_FuncPSDsit_HeaderFile 83