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1 | // Created on: 1997-05-13 |
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 _GeomLib_DenominatorMultiplier_HeaderFile |
18 | #define _GeomLib_DenominatorMultiplier_HeaderFile |
19 | |
20 | #include <Standard.hxx> |
21 | #include <Standard_DefineAlloc.hxx> |
22 | #include <Standard_Handle.hxx> |
23 | |
24 | #include <TColStd_Array1OfReal.hxx> |
25 | #include <Standard_Real.hxx> |
26 | class Geom_BSplineSurface; |
27 | class Standard_OutOfRange; |
28 | class Standard_ConstructionError; |
29 | |
30 | |
31 | //! this defines an evaluator for a function of 2 variables |
32 | //! that will be used by CancelDenominatorDerivative in one |
33 | //! direction. |
34 | class GeomLib_DenominatorMultiplier |
35 | { |
36 | public: |
37 | |
38 | DEFINE_STANDARD_ALLOC |
39 | |
40 | |
41 | //! if the surface is rational this will define the evaluator |
42 | //! of a real function of 2 variables a(u,v) such that |
43 | //! if we define a new surface by : |
44 | //! a(u,v) * N(u,v) |
45 | //! NewF(u,v) = ---------------- |
46 | //! a(u,v) * D(u,v) |
47 | Standard_EXPORT GeomLib_DenominatorMultiplier(const Handle(Geom_BSplineSurface)& Surface, const TColStd_Array1OfReal& KnotVector); |
48 | |
49 | //! Returns the value of |
50 | //! a(UParameter,VParameter)= |
51 | //! |
52 | //! H0(UParameter)/Denominator(Umin,Vparameter) |
53 | //! |
54 | //! D Denominator(Umin,Vparameter) |
55 | //! - ------------------------------[H1(u)]/(Denominator(Umin,Vparameter)^2) |
56 | //! D U |
57 | //! |
58 | //! + H3(UParameter)/Denominator(Umax,Vparameter) |
59 | //! |
60 | //! D Denominator(Umax,Vparameter) |
61 | //! - ------------------------------[H2(u)]/(Denominator(Umax,Vparameter)^2) |
62 | //! D U |
63 | Standard_EXPORT Standard_Real Value (const Standard_Real UParameter, const Standard_Real VParameter) const; |
64 | |
65 | |
66 | |
67 | |
68 | protected: |
69 | |
70 | |
71 | |
72 | |
73 | |
74 | private: |
75 | |
76 | |
77 | |
78 | Handle(Geom_BSplineSurface) mySurface; |
79 | TColStd_Array1OfReal myKnotFlatVector; |
80 | |
81 | |
82 | }; |
83 | |
84 | |
85 | |
86 | |
87 | |
88 | |
89 | |
90 | #endif // _GeomLib_DenominatorMultiplier_HeaderFile |