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1 | // Created on: 1997-02-18 |
| 2 | // Created by: Stagiaire Francois DUMONT |
| 3 | // Copyright (c) 1997-1999 Matra Datavision |
| 4 | // Copyright (c) 1999-2014 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 _Hermit_HeaderFile |
| 18 | #define _Hermit_HeaderFile |
| 19 | |
| 20 | #include <Standard.hxx> |
| 21 | #include <Standard_DefineAlloc.hxx> |
| 22 | #include <Standard_Handle.hxx> |
| 23 | |
| 24 | #include <Standard_Real.hxx> |
| 25 | class Geom2d_BSplineCurve; |
| 26 | class Geom_BSplineCurve; |
| 27 | |
| 28 | |
| 29 | //! This is used to reparameterize Rational BSpline |
| 30 | //! Curves so that we can concatenate them later to |
| 31 | //! build C1 Curves It builds and 1D-reparameterizing |
| 32 | //! function starting from an Hermite interpolation and |
| 33 | //! adding knots and modifying poles of the 1D BSpline |
| 34 | //! obtained that way. The goal is to build a(u) so that |
| 35 | //! if we consider a BSpline curve |
| 36 | //! N(u) |
| 37 | //! f(u) = ----- |
| 38 | //! D(u) |
| 39 | //! |
| 40 | //! the function a(u)D(u) has value 1 at the umin and umax |
| 41 | //! and has 0.0e0 derivative value a umin and umax. |
| 42 | //! The details of the computation occuring in this package |
| 43 | //! can be found by reading : |
| 44 | //! " Etude sur la concatenation de NURBS en vue du |
| 45 | //! balayage de surfaces" PFE n S85 Ensam Lille |
| 46 | class Hermit |
| 47 | { |
| 48 | public: |
| 49 | |
| 50 | DEFINE_STANDARD_ALLOC |
| 51 | |
| 52 | |
| 53 | //! returns the correct spline a(u) which will |
| 54 | //! be multiplicated with BS later. |
| 55 | Standard_EXPORT static Handle(Geom2d_BSplineCurve) Solution (const Handle(Geom_BSplineCurve)& BS, const Standard_Real TolPoles = 0.000001, const Standard_Real TolKnots = 0.000001); |
| 56 | |
| 57 | //! returns the correct spline a(u) which will |
| 58 | //! be multiplicated with BS later. |
| 59 | Standard_EXPORT static Handle(Geom2d_BSplineCurve) Solution (const Handle(Geom2d_BSplineCurve)& BS, const Standard_Real TolPoles = 0.000001, const Standard_Real TolKnots = 0.000001); |
| 60 | |
| 61 | //! returns the knots to insert to a(u) to |
| 62 | //! stay with a constant sign and in the |
| 63 | //! tolerances. |
| 64 | Standard_EXPORT static void Solutionbis (const Handle(Geom_BSplineCurve)& BS, Standard_Real& Knotmin, Standard_Real& Knotmax, const Standard_Real TolPoles = 0.000001, const Standard_Real TolKnots = 0.000001); |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | protected: |
| 70 | |
| 71 | |
| 72 | |
| 73 | |
| 74 | |
| 75 | private: |
| 76 | |
| 77 | |
| 78 | |
| 79 | |
| 80 | |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | |
| 85 | |
| 86 | |
| 87 | |
| 88 | |
| 89 | #endif // _Hermit_HeaderFile |
projects / occt.git / blame