1 // Created on: 1993-12-02
2 // Created by: Jacques GOUSSARD
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 #ifndef _Blend_FuncInv_HeaderFile
18 #define _Blend_FuncInv_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_DefineAlloc.hxx>
22 #include <Standard_Handle.hxx>
24 #include <math_FunctionSetWithDerivatives.hxx>
25 #include <Standard_Integer.hxx>
26 #include <Standard_Boolean.hxx>
27 #include <math_Vector.hxx>
28 #include <Standard_Real.hxx>
30 class Adaptor2d_HCurve2d;
33 //! Deferred class for a function used to compute a blending
34 //! surface between two surfaces, using a guide line.
35 //! This function is used to find a solution on a restriction
36 //! of one of the surface.
37 //! The vector <X> used in Value, Values and Derivatives methods
38 //! has to be the vector of the parametric coordinates t,w,U,V
39 //! where t is the parameter on the curve on surface,
40 //! w is the parameter on the guide line,
41 //! U,V are the parametric coordinates of a point on the
43 class Blend_FuncInv : public math_FunctionSetWithDerivatives
51 Standard_EXPORT Standard_Integer NbVariables() const;
53 //! returns the number of equations of the function.
54 Standard_EXPORT virtual Standard_Integer NbEquations() const = 0;
56 //! computes the values <F> of the Functions for the
58 //! Returns True if the computation was done successfully,
60 Standard_EXPORT virtual Standard_Boolean Value (const math_Vector& X, math_Vector& F) = 0;
62 //! returns the values <D> of the derivatives for the
64 //! Returns True if the computation was done successfully,
66 Standard_EXPORT virtual Standard_Boolean Derivatives (const math_Vector& X, math_Matrix& D) = 0;
68 //! returns the values <F> of the functions and the derivatives
69 //! <D> for the variable <X>.
70 //! Returns True if the computation was done successfully,
72 Standard_EXPORT virtual Standard_Boolean Values (const math_Vector& X, math_Vector& F, math_Matrix& D) = 0;
74 //! Sets the CurveOnSurface on which a solution has
75 //! to be found. If <OnFirst> is set to Standard_True,
76 //! the curve will be on the first surface, otherwise the
77 //! curve is on the second one.
78 Standard_EXPORT virtual void Set (const Standard_Boolean OnFirst, const Handle(Adaptor2d_HCurve2d)& COnSurf) = 0;
80 //! Returns in the vector Tolerance the parametric tolerance
81 //! for each of the 4 variables;
82 //! Tol is the tolerance used in 3d space.
83 Standard_EXPORT virtual void GetTolerance (math_Vector& Tolerance, const Standard_Real Tol) const = 0;
85 //! Returns in the vector InfBound the lowest values allowed
86 //! for each of the 4 variables.
87 //! Returns in the vector SupBound the greatest values allowed
88 //! for each of the 4 variables.
89 Standard_EXPORT virtual void GetBounds (math_Vector& InfBound, math_Vector& SupBound) const = 0;
91 //! Returns Standard_True if Sol is a zero of the function.
92 //! Tol is the tolerance used in 3d space.
93 Standard_EXPORT virtual Standard_Boolean IsSolution (const math_Vector& Sol, const Standard_Real Tol) = 0;
118 #endif // _Blend_FuncInv_HeaderFile