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File indexing completed on 2026-09-14 09:14:53
0001 // Created on: 1993-01-09 0002 // Created by: Kiran 0003 // Copyright (c) 1993-1999 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 _IGESGeom_BSplineCurve_HeaderFile 0018 #define _IGESGeom_BSplineCurve_HeaderFile 0019 0020 #include <Standard.hxx> 0021 #include <Standard_Type.hxx> 0022 0023 #include <Standard_Integer.hxx> 0024 #include <NCollection_Array1.hxx> 0025 #include <NCollection_HArray1.hxx> 0026 #include <gp_XYZ.hxx> 0027 #include <IGESData_IGESEntity.hxx> 0028 class gp_Pnt; 0029 0030 //! defines IGESBSplineCurve, Type <126> Form <0-5> 0031 //! in package IGESGeom 0032 //! A parametric equation obtained by dividing two summations 0033 //! involving weights (which are real numbers), the control 0034 //! points, and B-Spline basis functions 0035 class IGESGeom_BSplineCurve : public IGESData_IGESEntity 0036 { 0037 0038 public: 0039 Standard_EXPORT IGESGeom_BSplineCurve(); 0040 0041 //! This method is used to set the fields of the class 0042 //! BSplineCurve. Beware about indexation of arrays 0043 //! - anIndex : Upper index of the sum 0044 //! - aDegree : Degree of basis functions 0045 //! - aPlanar : 0 = nonplanar curve, 1 = planar curve 0046 //! - aClosed : 0 = open curve, 1 = closed curve 0047 //! - aPolynom : 0 = rational, 1 = polynomial 0048 //! - aPeriodic : 0 = nonperiodic, 1 = periodic 0049 //! - allKnots : Knot sequence values [-Degree,Index+1] 0050 //! - allWeights : Array of weights [0,Index] 0051 //! - allPoles : X, Y, Z coordinates of all control points 0052 //! [0,Index] 0053 //! - aUmin, aUmax : Starting and ending parameter values 0054 //! - aNorm : Unit normal (if the curve is planar) 0055 //! raises exception if allWeights & allPoles are not of same size. 0056 Standard_EXPORT void Init(const int anIndex, 0057 const int aDegree, 0058 const bool aPlanar, 0059 const bool aClosed, 0060 const bool aPolynom, 0061 const bool aPeriodic, 0062 const occ::handle<NCollection_HArray1<double>>& allKnots, 0063 const occ::handle<NCollection_HArray1<double>>& allWeights, 0064 const occ::handle<NCollection_HArray1<gp_XYZ>>& allPoles, 0065 const double aUmin, 0066 const double aUmax, 0067 const gp_XYZ& aNorm); 0068 0069 //! Changes FormNumber (indicates the Shape of the Curve) 0070 //! Error if not in range [0-5] 0071 Standard_EXPORT void SetFormNumber(const int form); 0072 0073 //! returns the upper index of the sum (see Knots,Poles) 0074 Standard_EXPORT int UpperIndex() const; 0075 0076 //! returns the degree of basis functions 0077 Standard_EXPORT int Degree() const; 0078 0079 //! returns True if the curve is Planar, False if non-planar 0080 Standard_EXPORT bool IsPlanar() const; 0081 0082 //! returns True if the curve is closed, False if open 0083 Standard_EXPORT bool IsClosed() const; 0084 0085 //! returns True if the curve is polynomial, False if rational 0086 //! <flag> False (D) : computed from the list of weights 0087 //! (all must be equal) 0088 //! <flag> True : as recorded 0089 Standard_EXPORT bool IsPolynomial(const bool flag = false) const; 0090 0091 //! returns True if the curve is periodic, False otherwise 0092 Standard_EXPORT bool IsPeriodic() const; 0093 0094 //! returns the number of knots (i.e. Degree + UpperIndex + 2) 0095 Standard_EXPORT int NbKnots() const; 0096 0097 //! returns the knot referred to by anIndex, 0098 //! inside the range [-Degree,UpperIndex+1] 0099 //! raises exception if 0100 //! anIndex < -Degree() or anIndex > (NbKnots() - Degree()) 0101 //! Note : Knots are numbered from -Degree (not from 1) 0102 Standard_EXPORT double Knot(const int anIndex) const; 0103 0104 //! returns number of poles (i.e. UpperIndex + 1) 0105 Standard_EXPORT int NbPoles() const; 0106 0107 //! returns the weight referred to by anIndex, in [0,UpperIndex] 0108 //! raises exception if anIndex < 0 or anIndex > UpperIndex() 0109 Standard_EXPORT double Weight(const int anIndex) const; 0110 0111 //! returns the pole referred to by anIndex, in [0,UpperIndex] 0112 //! raises exception if anIndex < 0 or anIndex > UpperIndex() 0113 Standard_EXPORT gp_Pnt Pole(const int anIndex) const; 0114 0115 //! returns the anIndex'th pole after applying Transf. Matrix 0116 //! raises exception if an Index < 0 or an Index > UpperIndex() 0117 Standard_EXPORT gp_Pnt TransformedPole(const int anIndex) const; 0118 0119 //! returns starting parameter value 0120 Standard_EXPORT double UMin() const; 0121 0122 //! returns ending parameter value 0123 Standard_EXPORT double UMax() const; 0124 0125 //! if the curve is nonplanar then (0, 0, 0) is returned 0126 Standard_EXPORT gp_XYZ Normal() const; 0127 0128 DEFINE_STANDARD_RTTIEXT(IGESGeom_BSplineCurve, IGESData_IGESEntity) 0129 0130 private: 0131 int theIndex; 0132 int theDegree; 0133 bool isPlanar; 0134 bool isClosed; 0135 bool isPolynomial; 0136 bool isPeriodic; 0137 occ::handle<NCollection_HArray1<double>> theKnots; 0138 occ::handle<NCollection_HArray1<double>> theWeights; 0139 occ::handle<NCollection_HArray1<gp_XYZ>> thePoles; 0140 double theUmin; 0141 double theUmax; 0142 gp_XYZ theNorm; 0143 }; 0144 0145 #endif // _IGESGeom_BSplineCurve_HeaderFile
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