// Copyright (c) 2014 OPEN CASCADE SAS // // This file is part of Open CASCADE Technology software library. // // This library is free software; you can redistribute it and/or modify it under // the terms of the GNU Lesser General Public License version 2.1 as published // by the Free Software Foundation, with special exception defined in the file // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT // distribution for complete text of the license and disclaimer of any warranty. // // Alternatively, this file may be used under the terms of Open CASCADE // commercial license or contractual agreement. #ifndef _BSplSLib_Cache_Headerfile #define _BSplSLib_Cache_Headerfile #include #include #include #include #include #include #include #include #include #include #include #include #include //! \brief A cache class for Bezier and B-spline surfaces. //! //! Defines all data, that can be cached on a span of the surface. //! The data should be recalculated in going from span to span. class BSplSLib_Cache : public Standard_Transient { public: //! Constructor for caching of the span for the surface //! \param theDegreeU degree along the first parameter (U) of the surface //! \param thePeriodicU identify the surface is periodical along U axis //! \param theFlatKnotsU knots of the surface (with repetition) along U axis //! \param theDegreeV degree alogn the second parameter (V) of the surface //! \param thePeriodicV identify the surface is periodical along V axis //! \param theFlatKnotsV knots of the surface (with repetition) along V axis //! \param theWeights array of weights of corresponding poles Standard_EXPORT BSplSLib_Cache(const Standard_Integer& theDegreeU, const Standard_Boolean& thePeriodicU, const TColStd_Array1OfReal& theFlatKnotsU, const Standard_Integer& theDegreeV, const Standard_Boolean& thePeriodicV, const TColStd_Array1OfReal& theFlatKnotsV, const TColStd_Array2OfReal* theWeights = NULL); //! Verifies validity of the cache using parameters of the point //! \param theParameterU first parameter of the point placed in the span //! \param theParameterV second parameter of the point placed in the span Standard_EXPORT Standard_Boolean IsCacheValid(Standard_Real theParameterU, Standard_Real theParameterV) const; //! Recomputes the cache data. Does not verify validity of the cache //! \param theParameterU the parametric value on the U axis to identify the span //! \param theParameterV the parametric value on the V axis to identify the span //! \param theDegreeU degree along U axis //! \param thePeriodicU identify whether the surface is periodic along U axis //! \param theFlatKnotsU flat knots of the surface along U axis //! \param theDegreeV degree along V axis //! \param thePeriodicV identify whether the surface is periodic along V axis //! \param theFlatKnotsV flat knots of the surface along V axis //! \param thePoles array of poles of the surface //! \param theWeights array of weights of corresponding poles Standard_EXPORT void BuildCache(const Standard_Real& theParameterU, const Standard_Real& theParameterV, const TColStd_Array1OfReal& theFlatKnotsU, const TColStd_Array1OfReal& theFlatKnotsV, const TColgp_Array2OfPnt& thePoles, const TColStd_Array2OfReal* theWeights = NULL); //! Calculates the point on the surface for specified parameters //! \param[in] theU first parameter for calculation of the value //! \param[in] theV second parameter for calculation of the value //! \param[out] thePoint the result of calculation (the point on the surface) Standard_EXPORT void D0(const Standard_Real& theU, const Standard_Real& theV, gp_Pnt& thePoint) const; //! Calculates the point on the surface and its first derivative //! \param[in] theU first parameter of calculation of the value //! \param[in] theV second parameter of calculation of the value //! \param[out] thePoint the result of calculation (the point on the surface) //! \param[out] theTangentU tangent vector along U axis in the calculated point //! \param[out] theTangentV tangent vector along V axis in the calculated point Standard_EXPORT void D1(const Standard_Real& theU, const Standard_Real& theV, gp_Pnt& thePoint, gp_Vec& theTangentU, gp_Vec& theTangentV) const; //! Calculates the point on the surface and derivatives till second order //! \param[in] theU first parameter of calculation of the value //! \param[in] theV second parameter of calculation of the value //! \param[out] thePoint the result of calculation (the point on the surface) //! \param[out] theTangentU tangent vector along U axis in the calculated point //! \param[out] theTangentV tangent vector along V axis in the calculated point //! \param[out] theCurvatureU curvature vector (2nd derivative on U) along U axis //! \param[out] theCurvatureV curvature vector (2nd derivative on V) along V axis //! \param[out] theCurvatureUV 2nd mixed derivative on U anv V Standard_EXPORT void D2(const Standard_Real& theU, const Standard_Real& theV, gp_Pnt& thePoint, gp_Vec& theTangentU, gp_Vec& theTangentV, gp_Vec& theCurvatureU, gp_Vec& theCurvatureV, gp_Vec& theCurvatureUV) const; DEFINE_STANDARD_RTTIEXT(BSplSLib_Cache,Standard_Transient) private: // copying is prohibited BSplSLib_Cache (const BSplSLib_Cache&); void operator = (const BSplSLib_Cache&); private: Standard_Boolean myIsRational; //!< identifies the rationality of Bezier/B-spline surface BSplCLib_CacheParams myParamsU, myParamsV; //!< cach parameters by U and V directions Handle(TColStd_HArray2OfReal) myPolesWeights; //!< array of poles and weights of calculated cache // the array has following structure: // x11 y11 z11 [w11] x12 y12 z12 [w12] ... // x21 y21 z21 [w21] x22 y22 z22 [w22] etc // for non-rational surfaces there is no weight; // size of array: (max(myDegree)+1) * A*(min(myDegree)+1), where A = 4 or 3 }; DEFINE_STANDARD_HANDLE(BSplSLib_Cache, Standard_Transient) #endif