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0001 // Created on: 1991-10-10 0002 // Created by: Jean Claude VAUTHIER 0003 // Copyright (c) 1991-1999 Matra Datavision 0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS 0005 // 0006 // This file is part of Open CASCADE Technology software library. 0007 // 0008 // This library is free software; you can redistribute it and/or modify it under 0009 // the terms of the GNU Lesser General Public License version 2.1 as published 0010 // by the Free Software Foundation, with special exception defined in the file 0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT 0012 // distribution for complete text of the license and disclaimer of any warranty. 0013 // 0014 // Alternatively, this file may be used under the terms of Open CASCADE 0015 // commercial license or contractual agreement. 0016 0017 #ifndef _Convert_ConicToBSplineCurve_HeaderFile 0018 #define _Convert_ConicToBSplineCurve_HeaderFile 0019 0020 #include <Standard.hxx> 0021 #include <Standard_DefineAlloc.hxx> 0022 #include <Standard_Handle.hxx> 0023 0024 #include <TColgp_HArray1OfPnt2d.hxx> 0025 #include <TColStd_HArray1OfReal.hxx> 0026 #include <TColStd_HArray1OfInteger.hxx> 0027 #include <Standard_Integer.hxx> 0028 #include <Convert_ParameterisationType.hxx> 0029 class gp_Pnt2d; 0030 0031 0032 //! Root class for algorithms which convert a conic curve into 0033 //! a BSpline curve (CircleToBSplineCurve, EllipseToBSplineCurve, 0034 //! HyperbolaToBSplineCurve, ParabolaToBSplineCurve). 0035 //! These algorithms all work on 2D curves from the gp 0036 //! package and compute all the data needed to construct a 0037 //! BSpline curve equivalent to the conic curve. This data consists of: 0038 //! - the degree of the curve, 0039 //! - the periodic characteristics of the curve, 0040 //! - a poles table with associated weights, 0041 //! - a knots table with associated multiplicities. 0042 //! The abstract class ConicToBSplineCurve provides a 0043 //! framework for storing and consulting this computed data. 0044 //! The data may then be used to construct a 0045 //! Geom2d_BSplineCurve curvSuper class of the following classes : 0046 //! This abstract class implements the methods to get the geometric 0047 //! representation of the B-spline curve equivalent to the conic. 0048 //! The B-spline is computed at the creation time in the sub classes. 0049 //! The B-spline curve is defined with its degree, its control points 0050 //! (Poles), its weights, its knots and their multiplicity. 0051 //! All the geometric entities used in this package are defined in 2D 0052 //! space. 0053 //! KeyWords : 0054 //! Convert, Conic, BSplineCurve, 2D. 0055 class Convert_ConicToBSplineCurve 0056 { 0057 public: 0058 0059 DEFINE_STANDARD_ALLOC 0060 0061 0062 //! Returns the degree of the BSpline curve whose data is 0063 //! computed in this framework. 0064 Standard_EXPORT Standard_Integer Degree() const; 0065 0066 //! Returns the number of poles of the BSpline curve whose 0067 //! data is computed in this framework. 0068 Standard_EXPORT Standard_Integer NbPoles() const; 0069 0070 //! Returns the number of knots of the BSpline curve whose 0071 //! data is computed in this framework. 0072 Standard_EXPORT Standard_Integer NbKnots() const; 0073 0074 //! Returns true if the BSpline curve whose data is computed in 0075 //! this framework is periodic. 0076 Standard_EXPORT Standard_Boolean IsPeriodic() const; 0077 0078 //! Returns the pole of index Index to the poles table of the 0079 //! BSpline curve whose data is computed in this framework. 0080 //! Exceptions 0081 //! Standard_OutOfRange if Index is outside the bounds of 0082 //! the poles table of the BSpline curve whose data is computed in this framework. 0083 Standard_EXPORT gp_Pnt2d Pole (const Standard_Integer Index) const; 0084 0085 //! Returns the weight of the pole of index Index to the poles 0086 //! table of the BSpline curve whose data is computed in this framework. 0087 //! Exceptions 0088 //! Standard_OutOfRange if Index is outside the bounds of 0089 //! the poles table of the BSpline curve whose data is computed in this framework. 0090 Standard_EXPORT Standard_Real Weight (const Standard_Integer Index) const; 0091 0092 //! Returns the knot of index Index to the knots table of the 0093 //! BSpline curve whose data is computed in this framework. 0094 //! Exceptions 0095 //! Standard_OutOfRange if Index is outside the bounds of 0096 //! the knots table of the BSpline curve whose data is computed in this framework. 0097 Standard_EXPORT Standard_Real Knot (const Standard_Integer Index) const; 0098 0099 //! Returns the multiplicity of the knot of index Index to the 0100 //! knots table of the BSpline curve whose data is computed in this framework. 0101 //! Exceptions 0102 //! Standard_OutOfRange if Index is outside the bounds of 0103 //! the knots table of the BSpline curve whose data is computed in this framework. 0104 Standard_EXPORT Standard_Integer Multiplicity (const Standard_Integer Index) const; 0105 0106 Standard_EXPORT void BuildCosAndSin (const Convert_ParameterisationType Parametrisation, Handle(TColStd_HArray1OfReal)& CosNumerator, Handle(TColStd_HArray1OfReal)& SinNumerator, Handle(TColStd_HArray1OfReal)& Denominator, Standard_Integer& Degree, Handle(TColStd_HArray1OfReal)& Knots, Handle(TColStd_HArray1OfInteger)& Mults) const; 0107 0108 Standard_EXPORT void BuildCosAndSin (const Convert_ParameterisationType Parametrisation, const Standard_Real UFirst, const Standard_Real ULast, Handle(TColStd_HArray1OfReal)& CosNumerator, Handle(TColStd_HArray1OfReal)& SinNumerator, Handle(TColStd_HArray1OfReal)& Denominator, Standard_Integer& Degree, Handle(TColStd_HArray1OfReal)& Knots, Handle(TColStd_HArray1OfInteger)& Mults) const; 0109 0110 0111 0112 0113 protected: 0114 0115 0116 Standard_EXPORT Convert_ConicToBSplineCurve(const Standard_Integer NumberOfPoles, const Standard_Integer NumberOfKnots, const Standard_Integer Degree); 0117 0118 0119 Handle(TColgp_HArray1OfPnt2d) poles; 0120 Handle(TColStd_HArray1OfReal) weights; 0121 Handle(TColStd_HArray1OfReal) knots; 0122 Handle(TColStd_HArray1OfInteger) mults; 0123 Standard_Integer degree; 0124 Standard_Integer nbPoles; 0125 Standard_Integer nbKnots; 0126 Standard_Boolean isperiodic; 0127 0128 0129 private: 0130 0131 0132 0133 0134 0135 }; 0136 0137 0138 0139 0140 0141 0142 0143 #endif // _Convert_ConicToBSplineCurve_HeaderFile
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