1 // Created on: 1997-11-20
2 // Created by: Philippe MANGIN
3 // Copyright (c) 1997-1999 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 _GeomFill_SectionLaw_HeaderFile
18 #define _GeomFill_SectionLaw_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_Type.hxx>
23 #include <MMgt_TShared.hxx>
24 #include <Standard_Boolean.hxx>
25 #include <Standard_Real.hxx>
26 #include <TColgp_Array1OfPnt.hxx>
27 #include <TColStd_Array1OfReal.hxx>
28 #include <TColgp_Array1OfVec.hxx>
29 #include <Standard_Integer.hxx>
30 #include <TColStd_Array1OfInteger.hxx>
31 #include <GeomAbs_Shape.hxx>
32 class Standard_NotImplemented;
33 class Standard_DomainError;
34 class Standard_OutOfRange;
35 class Geom_BSplineSurface;
40 class GeomFill_SectionLaw;
41 DEFINE_STANDARD_HANDLE(GeomFill_SectionLaw, MMgt_TShared)
43 //! To define section law in sweeping
44 class GeomFill_SectionLaw : public MMgt_TShared
50 //! compute the section for v = param
51 Standard_EXPORT virtual Standard_Boolean D0 (const Standard_Real Param, TColgp_Array1OfPnt& Poles, TColStd_Array1OfReal& Weigths) = 0;
53 //! compute the first derivative in v direction of the
54 //! section for v = param
55 //! Warning : It used only for C1 or C2 aproximation
56 Standard_EXPORT virtual Standard_Boolean D1 (const Standard_Real Param, TColgp_Array1OfPnt& Poles, TColgp_Array1OfVec& DPoles, TColStd_Array1OfReal& Weigths, TColStd_Array1OfReal& DWeigths);
58 //! compute the second derivative in v direction of the
59 //! section for v = param
60 //! Warning : It used only for C2 aproximation
61 Standard_EXPORT virtual Standard_Boolean D2 (const Standard_Real Param, TColgp_Array1OfPnt& Poles, TColgp_Array1OfVec& DPoles, TColgp_Array1OfVec& D2Poles, TColStd_Array1OfReal& Weigths, TColStd_Array1OfReal& DWeigths, TColStd_Array1OfReal& D2Weigths);
63 //! give if possible an bspline Surface, like iso-v are the
64 //! section. If it is not possible this methode have to
65 //! get an Null Surface. It is the default implementation.
66 Standard_EXPORT virtual Handle(Geom_BSplineSurface) BSplineSurface() const;
68 //! get the format of an section
69 Standard_EXPORT virtual void SectionShape (Standard_Integer& NbPoles, Standard_Integer& NbKnots, Standard_Integer& Degree) const = 0;
71 //! get the Knots of the section
72 Standard_EXPORT virtual void Knots (TColStd_Array1OfReal& TKnots) const = 0;
74 //! get the Multplicities of the section
75 Standard_EXPORT virtual void Mults (TColStd_Array1OfInteger& TMults) const = 0;
77 //! Returns if the sections are rationnal or not
78 Standard_EXPORT virtual Standard_Boolean IsRational() const = 0;
80 //! Returns if the sections are periodic or not
81 Standard_EXPORT virtual Standard_Boolean IsUPeriodic() const = 0;
83 //! Returns if law is periodic or not
84 Standard_EXPORT virtual Standard_Boolean IsVPeriodic() const = 0;
86 //! Returns the number of intervals for continuity
88 //! May be one if Continuity(me) >= <S>
89 Standard_EXPORT virtual Standard_Integer NbIntervals (const GeomAbs_Shape S) const = 0;
91 //! Stores in <T> the parameters bounding the intervals
92 //! of continuity <S>.
94 //! The array must provide enough room to accomodate
95 //! for the parameters. i.e. T.Length() > NbIntervals()
96 Standard_EXPORT virtual void Intervals (TColStd_Array1OfReal& T, const GeomAbs_Shape S) const = 0;
98 //! Sets the bounds of the parametric interval on
100 //! This determines the derivatives in these values if the
101 //! function is not Cn.
102 Standard_EXPORT virtual void SetInterval (const Standard_Real First, const Standard_Real Last) = 0;
104 //! Gets the bounds of the parametric interval on
106 Standard_EXPORT virtual void GetInterval (Standard_Real& First, Standard_Real& Last) const = 0;
108 //! Gets the bounds of the function parametric domain.
109 //! Warning: This domain it is not modified by the
111 Standard_EXPORT virtual void GetDomain (Standard_Real& First, Standard_Real& Last) const = 0;
113 //! Returns the tolerances associated at each poles to
114 //! reach in approximation, to satisfy: BoundTol error
115 //! at the Boundary AngleTol tangent error at the
116 //! Boundary (in radian) SurfTol error inside the
118 Standard_EXPORT virtual void GetTolerance (const Standard_Real BoundTol, const Standard_Real SurfTol, const Standard_Real AngleTol, TColStd_Array1OfReal& Tol3d) const = 0;
120 //! Is usefull, if (me) have to run numerical
121 //! algorithm to perform D0, D1 or D2
122 //! The default implementation make nothing.
123 Standard_EXPORT virtual void SetTolerance (const Standard_Real Tol3d, const Standard_Real Tol2d);
125 //! Get the barycentre of Surface.
126 //! An very poor estimation is sufficent.
127 //! This information is usefull to perform well
128 //! conditioned rational approximation.
129 //! Warning: Used only if <me> IsRational
130 Standard_EXPORT virtual gp_Pnt BarycentreOfSurf() const;
132 //! Returns the length of the greater section. This
133 //! information is usefull to G1's control.
134 //! Warning: With an little value, approximation can be slower.
135 Standard_EXPORT virtual Standard_Real MaximalSection() const = 0;
137 //! Compute the minimal value of weight for each poles
139 //! This information is usefull to control error
140 //! in rational approximation.
141 //! Warning: Used only if <me> IsRational
142 Standard_EXPORT virtual void GetMinimalWeight (TColStd_Array1OfReal& Weigths) const;
144 //! Say if all sections are equals
145 Standard_EXPORT virtual Standard_Boolean IsConstant (Standard_Real& Error) const;
147 //! Return a copy of the constant Section, if me
149 Standard_EXPORT virtual Handle(Geom_Curve) ConstantSection() const;
151 //! Returns True if all section are circle, with same
152 //! plane,same center and linear radius evolution
153 //! Return False by Default.
154 Standard_EXPORT virtual Standard_Boolean IsConicalLaw (Standard_Real& Error) const;
156 //! Return the circle section at parameter <Param>, if
157 //! <me> a IsConicalLaw
158 Standard_EXPORT virtual Handle(Geom_Curve) CirclSection (const Standard_Real Param) const;
163 DEFINE_STANDARD_RTTIEXT(GeomFill_SectionLaw,MMgt_TShared)
183 #endif // _GeomFill_SectionLaw_HeaderFile