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0e14656b30
Dereferenced null pointers was eliminated for PLib, BSplCLib and BSplSLib. All affected code was changed accordingly.
178 lines
10 KiB
C++
178 lines
10 KiB
C++
// Copyright (c) 2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _BSplCLib_Cache_Headerfile
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#define _BSplCLib_Cache_Headerfile
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#include <Standard.hxx>
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#include <Standard_Macro.hxx>
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#include <Standard_Type.hxx>
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#include <Standard_Transient.hxx>
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#include <gp_Pnt2d.hxx>
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#include <gp_Pnt.hxx>
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#include <gp_Vec2d.hxx>
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#include <gp_Vec.hxx>
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#include <TColStd_HArray2OfReal.hxx>
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#include <TColStd_HArray1OfReal.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColgp_Array1OfPnt.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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//! \brief A cache class for B-spline curves.
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//!
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//! Defines all data, that can be cached on a span of B-spline curve.
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//! The data should be recalculated in going from span to span.
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class BSplCLib_Cache : public Standard_Transient
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{
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public:
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//! Default constructor
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Standard_EXPORT BSplCLib_Cache();
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//! Constructor for caching of 2D curves
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//! \param theDegree degree of the B-spline
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//! \param thePeriodic identify the B-spline is periodic
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//! \param theFlatKnots knots of B-spline curve (with repetitions)
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//! \param thePoles2d array of poles of 2D B-spline
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//! \param theWeights array of weights of corresponding poles
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Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
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const Standard_Boolean& thePeriodic,
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const TColStd_Array1OfReal& theFlatKnots,
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const TColgp_Array1OfPnt2d& thePoles2d,
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const TColStd_Array1OfReal* theWeights = NULL);
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//! Constructor for caching of 3D curves
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//! \param theDegree degree of the B-spline
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//! \param thePeriodic identify the B-spline is periodic
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//! \param theFlatKnots knots of B-spline curve (with repetitions)
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//! \param thePoles array of poles of 3D B-spline
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//! \param theWeights array of weights of corresponding poles
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Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
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const Standard_Boolean& thePeriodic,
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const TColStd_Array1OfReal& theFlatKnots,
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const TColgp_Array1OfPnt& thePoles,
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const TColStd_Array1OfReal* theWeights = NULL);
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//! Verifies validity of the cache using flat parameter of the point
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//! \param theParameter parameter of the point placed in the span
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Standard_EXPORT Standard_Boolean IsCacheValid(Standard_Real theParameter) const;
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//! Recomputes the cache data for 2D curves. Does not verify validity of the cache
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//! \param theParameter the value on the knot's axis to identify the span
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//! \param theDegree degree of the B-spline
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//! \param thePeriodic identify the B-spline is periodic
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//! \param theFlatKnots knots of B-spline curve (with repetitions)
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//! \param thePoles2d array of poles of 2D B-spline
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//! \param theWeights array of weights of corresponding poles
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Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
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const Standard_Integer& theDegree,
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const Standard_Boolean& thePeriodic,
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const TColStd_Array1OfReal& theFlatKnots,
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const TColgp_Array1OfPnt2d& thePoles2d,
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const TColStd_Array1OfReal* theWeights = NULL);
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//! Recomputes the cache data for 3D curves. Does not verify validity of the cache
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//! \param theParameter the value on the knot's axis to identify the span
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//! \param theDegree degree of the B-spline
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//! \param thePeriodic identify the B-spline is periodic
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//! \param theFlatKnots knots of B-spline curve (with repetitions)
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//! \param thePoles array of poles of 3D B-spline
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//! \param theWeights array of weights of corresponding poles
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Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
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const Standard_Integer& theDegree,
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const Standard_Boolean& thePeriodic,
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const TColStd_Array1OfReal& theFlatKnots,
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const TColgp_Array1OfPnt& thePoles,
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const TColStd_Array1OfReal* theWeights = NULL);
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//! Calculates the point on B-spline in the selected point
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//! \param[in] theParameter parameter of calculation of the value
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//! \param[out] thePoint the result of calculation (the point on B-spline)
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Standard_EXPORT void D0(const Standard_Real& theParameter, gp_Pnt2d& thePoint) const;
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Standard_EXPORT void D0(const Standard_Real& theParameter, gp_Pnt& thePoint) const;
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//! Calculates the point on B-spline and its first derivative in the selected point
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//! \param[in] theParameter parameter of calculation of the value
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//! \param[out] thePoint the result of calculation (the point on B-spline)
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//! \param[out] theTangent tangent vector (first derivatives) for B-spline in the calculated point
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Standard_EXPORT void D1(const Standard_Real& theParameter, gp_Pnt2d& thePoint, gp_Vec2d& theTangent) const;
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Standard_EXPORT void D1(const Standard_Real& theParameter, gp_Pnt& thePoint, gp_Vec& theTangent) const;
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//! Calculates the point on B-spline and two derivatives in the selected point
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//! \param[in] theParameter parameter of calculation of the value
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//! \param[out] thePoint the result of calculation (the point on B-spline)
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//! \param[out] theTangent tangent vector (1st derivatives) for B-spline in the calculated point
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//! \param[out] theCurvature curvature vector (2nd derivatives) for B-spline in the calculated point
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Standard_EXPORT void D2(const Standard_Real& theParameter,
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gp_Pnt2d& thePoint,
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gp_Vec2d& theTangent,
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gp_Vec2d& theCurvature) const;
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Standard_EXPORT void D2(const Standard_Real& theParameter,
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gp_Pnt& thePoint,
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gp_Vec& theTangent,
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gp_Vec& theCurvature) const;
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//! Calculates the point on B-spline and three derivatives in the selected point
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//! \param[in] theParameter parameter of calculation of the value
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//! \param[out] thePoint the result of calculation (the point on B-spline)
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//! \param[out] theTangent tangent vector (1st derivatives) for B-spline in the calculated point
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//! \param[out] theCurvature curvature vector (2nd derivatives) for B-spline in the calculated point
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//! \param[out] theTorsion second curvature vector (3rd derivatives) for B-spline in the calculated point
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Standard_EXPORT void D3(const Standard_Real& theParameter,
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gp_Pnt2d& thePoint,
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gp_Vec2d& theTangent,
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gp_Vec2d& theCurvature,
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gp_Vec2d& theTorsion) const;
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Standard_EXPORT void D3(const Standard_Real& theParameter,
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gp_Pnt& thePoint,
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gp_Vec& theTangent,
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gp_Vec& theCurvature,
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gp_Vec& theTorsion) const;
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DEFINE_STANDARD_RTTI(BSplCLib_Cache, Standard_Transient)
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protected:
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//! Normalizes the parameter for periodical B-splines
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//! \param theFlatKnots knots with repetitions
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//! \param theParameter the value to be normalized into the knots array
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void PeriodicNormalization(const TColStd_Array1OfReal& theFlatKnots, Standard_Real& theParameter) const;
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//! Fills array of derivatives in the selected point of the B-spline
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//! \param[in] theParameter parameter of the calculation
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//! \param[in] theDerivative maximal derivative to be calculated (computes all derivatives lesser than specified)
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//! \param[out] theDerivArray result array of derivatives (with size (theDerivative+1)*(PntDim+1),
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//! where PntDim = 2 or 3 is a dimension of B-spline curve)
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void CalculateDerivative(const Standard_Real& theParameter,
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const Standard_Integer& theDerivative,
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Standard_Real& theDerivArray) const;
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private:
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Handle(TColStd_HArray2OfReal) myPolesWeights; ///< array of poles and weights of calculated cache
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// the array has following structure:
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// x1 y1 [z1] [w1]
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// x2 y2 [z2] [w2] etc
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// for 2D-curves there is no z conponent, for non-rational curves there is no weight
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Standard_Boolean myIsRational; ///< identifies the rationality of B-spline
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Standard_Real mySpanStart; ///< parameter for the first point of the span
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Standard_Real mySpanLength; ///< length of the span
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Standard_Integer mySpanIndex; ///< index of the span on B-spline curve
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Standard_Integer mySpanIndexMax; ///< maximal number of spans on B-spline curve
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Standard_Integer myDegree; ///< degree of B-spline
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Handle(TColStd_HArray1OfReal) myFlatKnots; ///< knots of B-spline (used for periodic normalization of parameters, exists only for periodical splines)
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};
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DEFINE_STANDARD_HANDLE(BSplCLib_Cache, Standard_Transient)
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#endif
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