Cubic spline. More...

#include <cur_cubic_spline3d.h>

Inheritance diagram for MbCubicSpline3D:

Collaboration diagram for MbCubicSpline3D:

Public Member Functions
MbSpaceItem &	Duplicate (MbRegDuplicate *=nullptr) const override
	Create a copy of the object. More...

MbeSpaceType	IsA () const override
	Get the type of the object.

bool	IsSame (const MbSpaceItem &other, double accuracy=LENGTH_EPSILON) const override
	Determine whether an object is equal. More...

bool	SetEqual (const MbSpaceItem &) override
	Make objects equal if they are similar. More...

void	Transform (const MbMatrix3D &, MbRegTransform *=nullptr) override
	Convert the object according to the matrix. More...

void	Move (const MbVector3D &, MbRegTransform *=nullptr) override
	Move an object along a vector. More...

void	Rotate (const MbAxis3D &, double angle, MbRegTransform *=nullptr) override
	Rotate an object around an axis at a given angle. More...

void	GetProperties (MbProperties &) override
	Outstanding properties of the object. More...

void	SetProperties (const MbProperties &) override
	Change the properties of an object. More...

double	GetTMin () const override
	Get the minimum value of parameter.

double	GetTMax () const override
	Get the maximum value of parameter.

void	PointOn (double &, MbCartPoint3D &) const override
	Calculate a point on the curve. More...

void	FirstDer (double &, MbVector3D &) const override
	Calculate first derivative.

void	SecondDer (double &, MbVector3D &) const override
	Calculate second derivative.

void	ThirdDer (double &, MbVector3D &) const override
	Calculate third derivative.

void	Explore (double &t, bool ext, MbCartPoint3D &pnt, MbVector3D &fir, MbVector3D sec, MbVector3D thir) const override
	Calculate point and derivatives of object for given parameter. More...

void	FourDer (double &, MbVector3D &) const
	Estimate the fourth derivative.

MbNurbs3D *	NurbsCurve (const MbCurveIntoNurbsInfo &) const override
	Construct a NURBS copy of a curve. More...

MbCurve3D *	NurbsCurve (const MbNurbsParameters &) const override
	Construct a NURBS copy of a curve. More...

void	Inverse (MbRegTransform *iReg=nullptr) override
	Change direction of a curve.

size_t	GetCount () const override
	Define the number of splittings for one passage in operations.

bool	IsDegenerate (double eps=METRIC_PRECISION) const override
	Check whether the curve is degenerated.calculate.

MbCurve3D *	Trimmed (double t1, double t2, int sense, const MbDimAccuracy &xyzEps, bool saveParamLenAndLaw) const override
	Construct a trimmed curve with the given two-dimensional accuracy. More...

MbCurve *	GetMap (const MbMatrix3D &, MbRect1D pRgn=nullptr, VERSION version=Math::DefaultMathVersion(), bool coincParams=nullptr) const override
	Construct a planar projection of a piece of a space curve. More...

bool	IsPlanar (double accuracy=METRIC_EPSILON) const override
	Is a curve planar?

bool	GetPlacement (MbPlacement3D &place, PlanarCheckParams params=PlanarCheckParams()) const override
	Fill the placement if a curve is planar.

bool	GetPlaneCurve (MbCurve *&curve2d, MbPlacement3D &place, bool saveParams, PlanarCheckParams params=PlanarCheckParams()) const override
	Get planar curve and placement if the space curve is planar. More...

double	CalculateMetricLength () const override
	Calculate the metric length of a curve.

bool	DistanceAlong (double &t, double len, int curveDir, double eps=Math::metricPrecision, VERSION version=Math::DefaultMathVersion()) const override
	Translate parameter along the curve. More...

void	GetAnalyticalFunctionsBounds (std::vector< double > &params) const override
	Get the boundaries of the curve sections that are described by one analytical function.

double	Step (double t, double sag) const override
	Calculate parameter step. More...

double	DeviationStep (double t, double angle) const override
	Calculate parameter step. More...

void	GetVectorList (SArray< MbVector3D > &vectors) const
	Second derivatives at control points.

ptrdiff_t	GetTListCount () const
	The number of parameters in knots.

void	GetTList (SArray< double > &params) const
	Parameters in knots.

ptrdiff_t	GetUppParam () const
	The number of segments.

virtual MbCurve3D *	Trimmed (double t1, double t2, int sense, bool saveParamLenAndLaw=false) const
	Construct a trimmed curve. More...

virtual MbCurve3D *	Trimmed (double t1, double t2, int sense, const MbDimAccuracy &xyzEps, bool saveParamLenAndLaw) const
	Construct a trimmed curve with the given two-dimensional accuracy. More...

Public Member Functions inherited from MbPolyCurve3D
MbeSpaceType	Type () const override
	Get the group object type.

void	AddYourGabaritTo (MbCube &) const override
	Expand sent bounding box (a.k.a. gabarit), so that it included the object. More...

void	PrepareIntegralData (const bool forced) const override
	Calculate temporary (mutable) data of an object. More...

void	GetBasisItems (RPArray< MbSpaceItem > &) override
	Outstanding reference objects in a container sent.

void	GetBasisPoints (MbControlData3D &) const override
	Get control points of object.

void	SetBasisPoints (const MbControlData3D &) override
	Change the object by control points.

void	Refresh () override
	Translate all the time (mutable) data objects in an inconsistent (initial) state.

bool	IsClosed () const override
	Define whether the curve is periodic. More...

double	GetMetricLength () const override
	Calculate the metric length of a curve.

double	GetLengthEvaluation () const override
	Calculate the metric length of a curve. More...

bool	IsPlanar (double accuracy=METRIC_EPSILON) const override
	Is a curve planar?

bool	GetPlacement (MbPlacement3D &place, PlanarCheckParams params=PlanarCheckParams()) const override
	Fill the placement if a curve is planar.

size_t	GetCount () const override
	Define the number of splittings for one passage in operations.

template<class PointsVector >
void	GetPoints (PointsVector &pnts) const
	Get array of control points.

template<class SegmentsVector >
void	GetLineSegments (SegmentsVector &segments, double eps=PARAM_REGION) const
	Get the array of segments.

Public Member Functions inherited from MbCurve3D
virtual	~MbCurve3D ()
	Destructor.

virtual void	Accept (Visitor &visitor)
	Implementation of a function initializing a visit of an object.

virtual MbResultType	Extend (const MbCurveExtensionParameters3D &parameters, c3d::SpaceCurveSPtr &resCurve) const
	Extend the curve. More...

size_t	size () const
	Size of curve interpreted as vector of curves.

const MbCurve3D *	operator[] (size_t) const
	An access operator.

MbeSpaceType	Type () const override
	Get the group object type.

MbeSpaceType	Family () const override
	Get family of objects.

virtual MbCurve3D &	InverseDuplicate () const
	Create a copy with changed direction.

double	DistanceToPoint (const MbCartPoint3D &) const override
	Determine the distance to the point. More...

void	AddYourGabaritTo (MbCube &) const override
	Expand sent bounding box (a.k.a. gabarit), so that it included the object. More...

void	Refresh () override
	Translate all the time (mutable) data objects in an inconsistent (initial) state.

virtual bool	IsSpaceSame (const MbSpaceItem &item, double eps=METRIC_REGION) const
	Are the objects identical in space?

virtual double	GetPeriod () const
	Return period. If a curve is not periodic then 0.

virtual bool	IsPeriodic () const
	Define whether the curve is periodic. More...

bool	IsTouch (double eps=Math::metricPrecision) const
	Determine whether a curve is closed regardless of the smoothness of the closure. More...

virtual void	Tangent (double &t, MbVector3D &) const
	Calculate tangent vector (normalized).

virtual void	Normal (double &t, MbVector3D &) const
	Calculate main normal vector.

virtual void	BNormal (double &t, MbVector3D &) const
	Calculate binormal vector.

virtual void	_PointOn (double t, MbCartPoint3D &p) const
	Calculate point at curve and its extension. More...

virtual void	_FirstDer (double t, MbVector3D &) const
	Calculate first derivative at curve and its extension.

virtual void	_SecondDer (double t, MbVector3D &) const
	Calculate second derivative at curve and its extension.

virtual void	_ThirdDer (double t, MbVector3D &) const
	Calculate third derivative at curve and its extension.

virtual void	_Tangent (double t, MbVector3D &) const
	Calculate tangent vector (normalized) at curve and its extension.

virtual void	_Normal (double t, MbVector3D &) const
	Calculate main normal vector (normalized) at curve and its extension.

virtual void	_BNormal (double t, MbVector3D &) const
	Calculate binormal vector (normalized) at curve and its extension.

virtual void	FastApproxExplore (double &t, MbCartPoint3D &pnt, MbVector3D &fir, MbVector3D *sec) const
	Calculate point and derivatives on the curve. More...

virtual double	MetricStep (double t, double length) const
	Calculate parameter step. More...

double	CurveStep (const double &t, const MbStepData &stepData) const
	Calculate parameter step. More...

virtual void	ResetTCalc () const
	Reset the current value of parameter.

virtual const MbCurve3D &	GetBasisCurve () const
	Returns the base curve if exists or itself.

virtual MbCurve3D &	SetBasisCurve ()
	Returns the base curve if exists or itself.

virtual double	Curvature (double t) const
	Calculate curvature of curve.

virtual void	ThirdMetricDer (double t, MbVector3D &vect) const
	Calculate second derivative of tangent.

MbNurbs3D *	NurbsCurve (const MbCurveIntoNurbsInfo *nInfo=nullptr) const
	Construct a NURBS copy of a curve. More...

virtual size_t	NurbsCurveMinPoints (const MbNurbsParameters &tParameters, double epsilon=c3d::METRIC_DELTA) const
	Define the number of knots of a NURBS curve which is required to approximate the curve with the given tolerance. More...

virtual MbCurve3D *	Trimmed (double t1, double t2, int sense, bool saveParamLenAndLaw=false) const
	Construct a trimmed curve. More...

double	GetParamLength () const
	Return the parametric length of a curve.

virtual double	CalculateLength (double t1, double t2) const
	Calculate the metric length of a curve. More...

virtual void	CalculateGabarit (MbCube &cube) const
	Calculate bounding box of a curve.

void	CalculateLocalGabarit (const MbMatrix3D &into, MbCube &cube) const override
	To compute bounding box in a local coordinate system. More...

virtual bool	IsStraight (bool ignoreParams=false) const
	Whether the line is straight?

virtual bool	IsSmoothConnected (double angleEps, bool ignoreLimits=false) const
	Define whether joints of contour/curve are smooth. More...

virtual void	ChangeCarrier (const MbSpaceItem &item, MbSpaceItem &init)
	Change the carrier. For surface curves.

virtual bool	ChangeCarrierBorne (const MbSpaceItem &item, MbSpaceItem &init, const MbMatrix &matr)
	Change the carrier. More...

MbProperty &	CreateProperty (MbePrompt name) const override
	Create your own property with the name.

void	CalculateMesh (const MbStepData &stepData, const MbFormNote &note, MbMesh &mesh) const override
	Build polygonal copy mesh. More...

virtual void	CalculatePolygon (const MbStepData &stepData, MbPolygon3D &polygon) const
	Calculate an array of points for drawing. More...

virtual void	GetCentre (MbCartPoint3D &) const
	Give the curve center.

virtual void	GetWeightCentre (MbCartPoint3D &) const
	Give the gravity center of a curve.

virtual MbeNewtonResult	PointProjectionNewton (const MbCartPoint3D &p, size_t iterLimit, double &t, bool ext) const
	Find the point projection to the curve. More...

virtual bool	NearPointProjection (const MbCartPoint3D &pnt, double &t, bool ext, MbRect1D *tRange=nullptr) const
	Find the point projection to the curve. More...

virtual MbeNewtonResult	IsoclinalNewton (const MbVector3D &dir, size_t iterLimit, double &t) const
	Find isoclines of a curve. More...

virtual void	GetIsoclinal (const MbVector3D &nor, SArray< double > &tIso) const
	Find all isoclines of a curve. More...

virtual double	DistanceToCurve (const MbCurve3D &curve2, double &t1, double &t2) const
	Calculate the nearest distance to a curve.

virtual double	DistanceToPlace (const MbPlacement3D &place, double &t0, double &angle) const
	The nearest point of a curve by the placement.

virtual double	GetRadius (double accuracy=METRIC_REGION) const
	Get the physical radius of the curve or zero if it impossible. More...

virtual bool	GetCircleAxis (MbAxis3D &axis) const
	Get an axis of a circle which is geometrically coincident to the given curve. More...

virtual MbCurve *	GetMapPsp (const MbMatrix3D &into, double zNear, MbRect1D *pRegion=nullptr) const
	Construct a planar projection of a piece of a space curve. More...

virtual MbCurve *	GetProjection (const MbPlacement3D &place, VERSION version) const
	Construct a planar projection of a space curve to a plane. More...

void	GetPointsByEvenParamDelta (size_t n, std::vector< MbCartPoint3D > &pnts) const
	Get n points of a curve with equal intervals by parameter.

void	GetPointsByEvenParamDelta (size_t n, SArray< MbCartPoint3D > &pnts) const

virtual void	GetPointsByEvenLengthDelta (size_t n, std::vector< MbCartPoint3D > &pnts) const
	Get n points of a curve with equal intervals by arc length.

void	GetPointsByEvenLengthDelta (size_t n, SArray< MbCartPoint3D > &pnts) const

void	GetBasisPoints (MbControlData3D &) const override
	Get control points of object.

void	SetBasisPoints (const MbControlData3D &) override
	Change the object by control points.

virtual bool	IsContinuousDerivative (bool &contLength, bool &contDirect, c3d::DoubleVector *params=nullptr, double epsilon=EPSILON) const
	Have the first derivative of the curve the continuous length and direction? More...

virtual bool	SetContinuousDerivativeLength (VERSION version, double epsilon=EPSILON)
	Eliminate the discontinuities of the first derivative at length. More...

bool	IsSpaceNear (const MbCurve3D &curve, double eps, bool ext, double devSag=5.0 *Math::deviateSag) const
	Check whether the two curves are metrically close. More...

bool	IsPointOn (const MbCartPoint3D &, double eps=METRIC_PRECISION) const
	Check whether a point is on a curve or not.

double	GetTMid () const
	Return the middle of parametric range of a curve.

double	GetTRange () const
	Return the parametric length of a curve.

MbCartPoint3D	PointOn (double &t) const
	Calculate point on the curve.

MbVector3D	FirstDer (double &t) const
	Calculate first derivative.

MbVector3D	SecondDer (double &t) const
	Calculate second derivative.

MbVector3D	ThirdDer (double &t) const
	Calculate third derivative.

virtual void	GetCurvatureSpecialPoints (std::vector< c3d::DoublePair > &points, double *energy=nullptr) const
	Find all the special points of the curvature function of the curve. More...

virtual void	BreakPoints (std::vector< double > &vBreaks, double precision=ANGLE_REGION) const
	\ ru Определение точек излома кривой. The determination of curve smoothness break points.

MbCartPoint3D	GetLimitPoint (ptrdiff_t number) const
	Calculate the boundary point. More...

void	GetLimitPoint (ptrdiff_t number, MbCartPoint3D &pnt) const
	Calculate the boundary point. More...

MbVector3D	GetLimitTangent (ptrdiff_t number) const
	Calculate a tangent vector to the boundary point. More...

void	GetLimitTangent (ptrdiff_t number, MbVector3D &v) const
	Calculate a tangent vector to the boundary point. More...

bool	AreLimitPointsEqual () const
	Are boundary points equal? More...

bool	SetInParamRegion (double &t) const
	Move to the parametric region.

bool	IsParamOn (double t, double eps) const
	Check whether a parameter is in the range of the curve.

bool	IsInverseSame (const MbCurve3D &curve, double accuracy=LENGTH_EPSILON) const
	Whether an inversed curve is the same.

virtual bool	IsReparamSame (const MbCurve3D &curve, double &factor) const
	Define whether a reparameterized curve is the same. More...

virtual double	GetParamToUnit () const
	Get increment of parameter, corresponding to the unit length in space.

virtual double	GetParamToUnit (double t) const
	Get increment of parameter, corresponding to the unit length in space.

double	GetTEpsilon () const
	Get the minimum distinguishable value of parameter.

double	GetTEpsilon (double t) const
	Get the minimum distinguishable value of parameter.

double	GetTRegion () const
	Get the minimum distinguishable value of parameter.

double	GetTRegion (double t) const
	Get the minimum distinguishable value of parameter.

double	GetTRegion (double t, const MbDimAccuracy &xyzEps) const
	Get the minimum distinguishable value of parameter with the given three-dimensional accuracy according to parameter.

virtual const MbCurve3D &	GetSubstrate () const
	Get a substrate or itself.

virtual MbCurve3D &	SetSubstrate ()
	Get a substrate or itself.

virtual int	SubstrateCurveDirection () const
	Direction of a substrate relative to a curve or vice versa.

virtual void	SubstrateToCurve (double &) const
	Transform a substrate parameter to the curve parameter.

virtual void	CurveToSubstrate (double &) const
	Transform a curve parameter to the substrate parameter.

bool	GetPlaneCurve (SPtr< MbCurve > &curve2d, MbPlacement3D &place, bool saveParams, PlanarCheckParams params=PlanarCheckParams()) const
	Get planar curve and placement if the space curve is planar. More...

bool	GetPlaneCurve (SPtr< const MbCurve > &curve2d, MbPlacement3D &place, bool saveParams, PlanarCheckParams params=PlanarCheckParams()) const
	Get planar curve and placement if the space curve is planar. More...

virtual bool	GetSurfaceCurve (MbCurve &curve2d, MbSurface &surface, VERSION version=Math::DefaultMathVersion()) const
	Get surface curve if the space curve is surface (after the using call DeleteItem for arguments)

bool	GetSurfaceCurve (SPtr< MbCurve > &curve2d, SPtr< MbSurface > &surface, VERSION version=Math::DefaultMathVersion()) const
	Get surface curve if the space curve is surface (after the using call DeleteItem for arguments)

bool	GetSurfaceCurve (SPtr< const MbCurve > &curve2d, SPtr< const MbSurface > &surface, VERSION version=Math::DefaultMathVersion()) const
	Get surface curve if the space curve is surface (after the using call DeleteItem for arguments)

virtual bool	IsShift (const MbSpaceItem &, MbVector3D &, bool &isSame, double accuracy=LENGTH_EPSILON) const
	Is the object is a shift?

virtual bool	IsSimilarToCurve (const MbCurve3D &other, double precision=METRIC_PRECISION) const
	Whether the curves to union (joining) are similar.

void	CalculateGrid (double radius, const MbStepData &stepData, MbMesh &mesh) const
	Approximation of a curve by the flat tube with the given radius.

SimpleName	GetCurveName () const
	A curve name.

void	SetCurveName (SimpleName newName)
	Set a curve name.

Public Member Functions inherited from MbSpaceItem
virtual	~MbSpaceItem ()
	Destructor.

void	PrepareWrite () const
	Register object. More...

MbeRefType	RefType () const override
	Get a registration type (for copying, duplication).

bool	IsFamilyRegistrable () const override
	Whether the object belongs to a registrable family.

virtual bool	IsSimilar (const MbSpaceItem &item) const
	Determine whether an object is similar. More...

void	CalculateWire (const MbStepData &stepData, MbMesh &mesh) const

void	CalculateWire (double sag, MbMesh &mesh) const

Public Member Functions inherited from TapeBase
	TapeBase (RegistrableRec regs=noRegistrable)
	Constructor.

	TapeBase (const TapeBase &)
	Copy-constructor.

virtual	~TapeBase ()
	Destructor.

RegistrableRec	GetRegistrable () const
	Whether the stream class is registrable.

void	SetRegistrable (RegistrableRec regs=registrable) const
	Set the state of registration of the stream class.

virtual const char *	GetPureName (const VersionContainer &) const
	Get the class name.

Public Member Functions inherited from MbRefItem
void	AddRegistrator (MbRegDuplicate *reg) const
	Add the register.

void	RemoveRegistrator (MbRegDuplicate *reg) const
	Remove the register.

refcount_t	GetUseCount () const
	Get count of references (get count of owners of an object).

refcount_t	AddRef () const
	Increase count of references by one.

refcount_t	DecRef () const
	Decrease count of references by one.

refcount_t	Release () const
	Decrease count of references by one and if count of references became zero, then remove itself.

Public Member Functions inherited from MbNestSyncItem
void	Lock () const
	Switch lock on (locking happens only in parallel region).

void	Unlock () const
	Switch lock off if locking has been set.

CommonRecursiveMutex *	GetLock () const
	Get a pointer to the mutex object. Return nullptr if no parallelism. For use in ScopedLock.

Static Public Member Functions
static MbCubicSpline3D *	Create (const MbCubicSpline3D &other)
	Create copy of spline. More...

static MbCubicSpline3D *	Create (const MbCurve3D &curve, VERSION version)
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, bool cls, VERSION version=Math::DefaultMathVersion())
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, const SArray< MbVector3D > &seconds, bool cls, VERSION version=Math::DefaultMathVersion())
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, const SArray< double > &params, bool cls)
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, const SArray< MbVector3D > &seconds, const SArray< double > &params, bool cls)
	Create spline. More...

static MbCubicSpline3D *	Create (const MbCubicSpline &initFlat, const MbPlacement3D &plane)
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, const MbVector3D &vectS, const MbVector3D &vectE, bool sInit, bool eInit)
	Create spline. More...

static MbCubicSpline3D *	Create (const SArray< MbCartPoint3D > &points, const SArray< double > &params, const MbVector3D &vectS, const MbVector3D &vectE, bool sInit, bool eInit)
	Create spline. More...

Protected Member Functions
	MbCubicSpline3D ()
	Constructor by default.

Protected Member Functions inherited from MbCurve3D
	MbCurve3D ()
	Default constructor.

	MbCurve3D (const MbCurve3D &other)
	Copy-constructor.

Protected Member Functions inherited from MbSpaceItem
	MbSpaceItem ()
	Default constructor.

Protected Member Functions inherited from MbRefItem
	MbRefItem ()
	Constructor without parameters.

Protected Attributes
SArray< MbVector3D >	vectorList
	Set of second derivatives at the control points.

SArray< double >	tList
	Set of parameters at the control points.

ptrdiff_t	splinesCount
	Maximal value of index in the parameters tList.

Protected Attributes inherited from MbPolyCurve3D
ptrdiff_t	uppIndex
	Count of curve pieces (is equal to count of control points minus one).

SArray< MbCartPoint3D >	pointList
	Set of control points.

bool	closed
	An attribute of curve closedness.

atomic_double	metricLength
	Metric length of curve.

atomic_double	lengthEvaluation
	Estimated length of a curve.

MbCube	cube
	Bounding box of curve.

Protected Attributes inherited from MbCurve3D
SimpleName	name
	A curve name. The object data is temporary and used internally.

Detailed Description

Cubic spline.

Cubic spline is defined by control points "pointList" and spline parameter values in the control points. By control points of the spline and parameter values in the control points there are calculated second derivatives of the spline vectorList at the control points. For unclosed curve the sets pointList, vectorList and tList must contain the same number of elements. For closed curve the number of elements tList must be one greater than the number of elements of pointList and vectorList. Cubic spline passes through its control points for parameter values from the set tList. On each region between two neighboring control points the spline is described by the cubic polynomial. Cubic polynomials are smoothly connected at the control points and they have continuous second derivatives at these points. The second derivatives between the two neighboring control points of spline are changed linearly.

Member Function Documentation

◆ Create() [1/9]

static MbCubicSpline3D* MbCubicSpline3D::Create ( const MbCubicSpline3D & other )

static

Create copy of spline.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [2/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const MbCurve3D &	curve,
		VERSION	version
	)

static

Create spline.

Create spline by a given curve and set parameters of spline.

Parameters

[in]	curve	- Given curve.
[in]	version	- Version.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [3/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		bool	cls,
		VERSION	version = `Math::DefaultMathVersion()`
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	cls	- A closedness attribute.
[in]	version	- Version.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [4/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		const SArray< MbVector3D > &	seconds,
		bool	cls,
		VERSION	version = `Math::DefaultMathVersion()`
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	seconds	- Set of second derivatives at the control points.
[in]	cls	- A closedness attribute.
[in]	version	- Version.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [5/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		const SArray< double > &	params,
		bool	cls
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	params	- Set of parameters at the control points.
[in]	cls	- A closedness attribute.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [6/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		const SArray< MbVector3D > &	seconds,
		const SArray< double > &	params,
		bool	cls
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	seconds	- Set of second derivatives at the control points.
[in]	params	- Set of parameters at the control points.
[in]	cls	- A closedness attribute.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [7/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const MbCubicSpline &	initFlat,
		const MbPlacement3D &	plane
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	initFlat	- Plane spline.
[in]	plane	- Plane of curve.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [8/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		const MbVector3D &	vectS,
		const MbVector3D &	vectE,
		bool	sInit,
		bool	eInit
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	vectS	- First derivative at the begin.
[in]	vectE	- First derivative at the end.
[in]	sInit	- Use or not first derivative at the begin.
[in]	eInit	- Use or not first derivative at the end.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Create() [9/9]

static MbCubicSpline3D* MbCubicSpline3D::Create	(	const SArray< MbCartPoint3D > &	points,
		const SArray< double > &	params,
		const MbVector3D &	vectS,
		const MbVector3D &	vectE,
		bool	sInit,
		bool	eInit
	)

static

Create spline.

Create spline and set parameters of spline.

Parameters

[in]	points	- Set of control points.
[in]	params	- Set of parameters at the control points.
[in]	vectS	- First derivative at the begin.
[in]	vectE	- First derivative at the end.
[in]	sInit	- Use or not first derivative at the begin.
[in]	eInit	- Use or not first derivative at the end.

Returns: Returns pointer to the created object or null pointer in case of failure.

◆ Duplicate()

MbSpaceItem& MbCubicSpline3D::Duplicate ( MbRegDuplicate * iReg = nullptr ) const

overridevirtual

Create a copy of the object.

Create a copy of an object using the registrator. Registrator is used to prevent multiple copy of the object. If the object contains references to the other objects, then nested objects are copied as well. It is allowed not to pass registrator into the function. Then new copy of object will be created. While copying of single object or set of not connected objects, it is allowed not to use registrator. Registrator should be used if it is required to copy several connected objects. It is possible, that objects connection is based on the references to common objects. Then, while copying without using of registrator, it is possible to obtain set of copies, that contain references to the different copies of the same nested object, that leads to loss of connection between copies.

Parameters

[in] iReg - Registrator.

Returns: A copy of the object.

Implements MbSpaceItem.

◆ IsSame()

bool MbCubicSpline3D::IsSame	(	const MbSpaceItem &	other,
		double	accuracy = `LENGTH_EPSILON`
	)		const

overridevirtual

Determine whether an object is equal.

Still considered objects of the same type, all data is the same (equal).

Parameters

[in]	item	- The object to compare.
[in]	accuracy	- The accuracy to compare.

Returns: Whether the objects are equal.

Implements MbSpaceItem.

◆ SetEqual()

bool MbCubicSpline3D::SetEqual ( const MbSpaceItem & item )

overridevirtual

Make objects equal if they are similar.

You can still make only a similar objects.

Parameters

[in] item - The object to initialize.

Returns: Object is changed.

Implements MbSpaceItem.

◆ Transform()

void MbCubicSpline3D::Transform	(	const MbMatrix3D &	matr,
		MbRegTransform *	iReg = `nullptr`
	)

overridevirtual

Convert the object according to the matrix.

Convert the original object according to the matrix using the registrator. If object contains references to the other geometric objects, then nested objects are transformed according to the matrix. Registrator is needed to prevent multiple object copying. It is allowed to use function without registrator, if it is needed to transform single object. If it is needed to transform a set of connected objects, then one should use registrator to prevent repeating transformation of nested objects, because of the possible situation when several objects contain references to the same common objects, that require to be transformed.

Parameters

[in]	matr	- Transformation matrix.
[in]	iReg	- Registrator.

Implements MbSpaceItem.

◆ Move()

void MbCubicSpline3D::Move	(	const MbVector3D &	to,
		MbRegTransform *	iReg = `nullptr`
	)

overridevirtual

Move an object along a vector.

Move an object along a geometric vector using the registrator. If object contains references to the other geometric objects then the move operation is applied to the nested objects. Registrator is needed to prevent multiple copying of the object. It is allowed to use function without registrator, if it is needed to transform a single object. If it is needed to transform a set of connected objects, then one should use registrator to prevent repeating transformation of nested objects, because of the possible situation when several objects contain references to the same common objects, that require to be moved.

Parameters

[in]	to	- Shift vector.
[in]	iReg	- Registrator.

Implements MbSpaceItem.

◆ Rotate()

void MbCubicSpline3D::Rotate	(	const MbAxis3D &	axis,
		double	angle,
		MbRegTransform *	iReg = `nullptr`
	)

overridevirtual

Rotate an object around an axis at a given angle.

Rotate an object around an axis at a given angle with the registrator. If object contains references to the other geometric objects then the rotation operation is applied to the nested objects. Registrator is needed to prevent multiple copying of the object. It is allowed to use function without registrator, if it is needed to transform a single object. If it is needed to transform a set of connected objects, then one should use registrator to prevent repeating transformation of nested objects, because of the possible situation when several objects contain references to the same common objects, that require to be rotated.

Parameters

[in]	axis	- The axis of rotation.
[in]	angle	- Rotation.
[in]	iReg	- Registrator.

Implements MbSpaceItem.

◆ GetProperties()

void MbCubicSpline3D::GetProperties ( MbProperties & properties )

overridevirtual

Outstanding properties of the object.

Issue internal data (properties) of the object for viewing and modification.

Parameters

[in] properties - Container for the internal data of the object.

Implements MbSpaceItem.

◆ SetProperties()

void MbCubicSpline3D::SetProperties ( const MbProperties & properties )

overridevirtual

Change the properties of an object.

Changing the internal data (properties) of the object you are copying the corresponding values from the sent object.

Parameters

[in] properties - Container for the internal data of the object.

Implements MbSpaceItem.

◆ PointOn()

void MbCubicSpline3D::PointOn	(	double &	t,
		MbCartPoint3D &	p
	)		const

overridevirtual

Calculate a point on the curve.

Correct parameter when getting out of domain bounds and calculate a point on the curve.

Parameters

[in]	t	- Curve parameter.
[out]	p	- A point on the curve.

Implements MbCurve3D.

◆ Explore()

void MbCubicSpline3D::Explore	(	double &	t,
		bool	ext,
		MbCartPoint3D &	pnt,
		MbVector3D &	fir,
		MbVector3D *	sec,
		MbVector3D *	thir
	)		const

overridevirtual

Calculate point and derivatives of object for given parameter.

Values of point and derivatives are calculated on parameter area and on extended curve.

Parameters

[in]	t	- Parameter.
[in]	ext	- On parameters area (false), on extended curve (true).
[out]	pnt	- Point.
[out]	fir	- Derivative with respect to t.
[out]	sec	- Second derivative with respect to t, if not nullptr.
[out]	thir	- Third derivative with respect to t, if not nullptr.

Reimplemented from MbCurve3D.

◆ NurbsCurve() [1/2]

MbNurbs3D* MbCubicSpline3D::NurbsCurve ( const MbCurveIntoNurbsInfo & nInfo ) const

overridevirtual

Construct a NURBS copy of a curve.

Constructs a NURBS curve which approximates a given curve inside the range [t1, t2]. with a given direction. If it is possible, constructs the accurate curve, perhaps with multiple knots. The number of knots for NURBS is defined depending on the curve.

Parameters

[in]	t1	- Parameter corresponding to start of approximated part of a curve.
[in]	t2	- Parameter corresponding to end of approximated part of a curve.
[in]	sense	- Does the direction of parameter increasing along the NURBS curve coincide with direction of the initial curve. 'sense' > 0 - direction coincide.
[in]	nInfo	- Parameters of conversion of a curve to NURBS.

Returns: The constructed NURBS curve or nullptr in a case of failure.

Reimplemented from MbCurve3D.

◆ NurbsCurve() [2/2]

MbCurve3D* MbCubicSpline3D::NurbsCurve ( const MbNurbsParameters & tParameters ) const

overridevirtual

Construct a NURBS copy of a curve.

Constructs a NURBS curve which approximates a given curve with the given parameters. In parameters the degree and the number of knots of a spline and the range of curve's parameters changing may be set. If the flag of accurate approximation is not set in parameters then NURBS without multiple knots is constructed.

Parameters

[in] tParameters - Parameters for the construction of a NURBS copy of the curve.

Returns: The constructed NURBS curve or nullptr in a case of failure.

Reimplemented from MbCurve3D.

◆ Trimmed() [1/3]

MbCurve3D* MbCubicSpline3D::Trimmed	(	double	t1,
		double	t2,
		int	sense,
		const MbDimAccuracy &	xyzEps,
		bool	saveParamLenAndLaw
	)		const

overridevirtual

Construct a trimmed curve with the given two-dimensional accuracy.

Constructs a trimmed curve, a start point of which corresponds to a point with parameter t1 and an end point corresponds to a point with parameter t2. Direction of the constructed curve relative to the initial curve may be changed by the parameter 'sense'. If the curve is closed, then there may be obtained a trimmed curve, passing through the start of a curve.
In a case of closed or periodic curve three parameters 'sense', t1 and t2 clearly define the result. In a case of unclosed curve the parameter 'sense' and parameter of trimming should correspond each other:
1) if sense == 1, then t1 < t2,
2) if sense == -1, then t1 > t2,
If there is a discrepancy between 'sense' and parameters of trimming, then 'sense' parameter has higher priority. If parameters t1 and t2 are equal and the curve is closed, then in result a closed curve should be obtained.

Parameters

[in]	t1	- Parameter corresponding to start of a trimmed curve.
[in]	t2	- Parameter corresponding to end of a trimmed curve.
[in]	sense	- Direction of a trimmed curve in relation to an initial curve. sense = 1 - direction does not change. sense = -1 - direction changes to the opposite value.
[in]	xyzEps	- Three-dimensional accuracy.
[in]	saveParLenAndLaw	- Save parametric length and law.

Returns: A constructed trimmed curve.

Warning: Under development.

Reimplemented from MbCurve3D.

◆ GetMap()

MbCurve* MbCubicSpline3D::GetMap	(	const MbMatrix3D &	into,
		MbRect1D *	pRegion = `nullptr`,
		VERSION	version = `Math::DefaultMathVersion()`,
		bool *	coincParams = `nullptr`
	)		const

overridevirtual

Construct a planar projection of a piece of a space curve.

Parameters

[in]	into	- The transformation matrix from the global coordinate system into a plane of view.
[in]	pRegion	- A mapped piece of a curve (paramRegion.x = t1, paramRegion.y = t2), by default - the whole curve..
[in]	version	- Version, last by default.
[in,out]	coincParams	- A flag of coincidence between parameterization of initial curve and its projection if coincParams != nullptr then the function tries to create a projection with coincident parameterization if *coincParams = true then parameterization of projection coincides with parameterization of initial curve.

Returns: Two-dimensional projection of a curve

Reimplemented from MbCurve3D.

◆ GetPlaneCurve()

bool MbCubicSpline3D::GetPlaneCurve	(	MbCurve *&	curve2d,
		MbPlacement3D &	place,
		bool	saveParams,
		PlanarCheckParams	params = `PlanarCheckParams()`
	)		const

overridevirtual

Get planar curve and placement if the space curve is planar.

Get planar curve and placement if the space curve is planar (after the using call DeleteItem for two-dimensional curves).

Parameters

[out]	curve2d	- The resulting flat curve.
[out]	place	- The coordinate system of the resulting 2D curve.
[in]	saveParams	- The parameter specifying the preservation of the correspondence of the parameterization for the two-dimensional curve. If true - parameterization of curve2d curve must match the parameterization of the original curve this. If false - curve parameterizations may not correspond. The curve2d is more likely to be detected than with the true flag.
[in]	params	- Validation parameters.

Returns: true if a flat curve was created.

Reimplemented from MbCurve3D.

◆ DistanceAlong()

bool MbCubicSpline3D::DistanceAlong	(	double &	t,
		double	len,
		int	curveDir,
		double	eps = `Math::metricPrecision`,
		VERSION	version = `Math::DefaultMathVersion()`
	)		const

overridevirtual

Translate parameter along the curve.

Translate parameter along the curve by the given distance at the given direction. The new value of parameter is saved in the variable t. If the curve is not closed and the length of its part from the point with parameter t to the end at the given direction is less than the required shift, then calculations are performed on extension of the curve, if it possible to construct such extension.

Parameters

[in,out]	t	- Input - the initial value of parameter. Output - the new value of parameter.
[in]	len	- The value of shift along the curve.
[in]	curveDir	- The offset direction. If curveDir is non-negative, then the shift is directed to the side of increasing of parameter. Otherwise - to the side of decreasing of parameter.
[in]	eps	- Computational tolerance.

Returns: True - if the operation is performed successfully, otherwise false.

Reimplemented from MbCurve3D.

◆ Step()

double MbCubicSpline3D::Step	(	double	t,
		double	sag
	)		const

overridevirtual

Calculate parameter step.

Calculate parameter step for the curve's approximation by its sag value. Calculation of the step is performed with consideration of curvature radius. A step of curve's approximation is chosen in such way, that the deviation from its polygon does not exceed the given value of sag.

Parameters

[in]	t	- A parameter defining the point on a curve, at which a step should be calculated.
[in]	sag	- Maximum feasible sag value.

Returns: A sag value by parameter at given point.

Reimplemented from MbCurve3D.

◆ DeviationStep()

double MbCubicSpline3D::DeviationStep	(	double	t,
		double	ang
	)		const

overridevirtual

Calculate parameter step.

Calculate parameter step for the curve's approximation by the deviation angle of the tangent vector. A step of curve's approximation is chosen in such way, that angular deviation of the tangent curve at the next point does not exceed the given value ang.

Parameters

[in]	t	- A parameter defining the point on a curve, at which a step should be calculated.
[in]	ang	- The maximum feasible deviation angle of tangent.

Returns: A sag value by parameter at given point.

Reimplemented from MbCurve3D.

◆ Trimmed() [2/3]

virtual MbCurve3D* MbCurve3D::Trimmed

Construct a trimmed curve.

Constructs a trimmed curve, a start point of which corresponds to a point with parameter t1 and an end point corresponds to a point with parameter t2. Direction of the constructed curve relative to the initial curve may be changed by the parameter 'sense'. If the curve is closed, then there may be obtained a trimmed curve, passing through the start of a curve.
In a case of closed or periodic curve three parameters 'sense', t1 and t2 clearly define the result. In a case of unclosed curve the parameter 'sense' and parameter of trimming should correspond each other:
1) if sense == 1, then t1 < t2,
2) if sense == -1, then t1 > t2,
If there is a discrepancy between 'sense' and parameters of trimming, then 'sense' parameter has higher priority. If parameters t1 and t2 are equal and the curve is closed, then in result a closed curve should be obtained.

Parameters

[in]	t1	- Parameter corresponding to start of a trimmed curve.
[in]	t2	- Parameter corresponding to end of a trimmed curve.
[in]	sense	- Direction of a trimmed curve in relation to an initial curve. sense = 1 - direction does not change. sense = -1 - direction changes to the opposite value.
[in]	saveParLenAndLaw	- Save parametric length and law.

Returns: A constructed trimmed curve.

◆ Trimmed() [3/3]

virtual MbCurve3D* MbCurve3D::Trimmed

Construct a trimmed curve with the given two-dimensional accuracy.

Constructs a trimmed curve, a start point of which corresponds to a point with parameter t1 and an end point corresponds to a point with parameter t2. Direction of the constructed curve relative to the initial curve may be changed by the parameter 'sense'. If the curve is closed, then there may be obtained a trimmed curve, passing through the start of a curve.
In a case of closed or periodic curve three parameters 'sense', t1 and t2 clearly define the result. In a case of unclosed curve the parameter 'sense' and parameter of trimming should correspond each other:
1) if sense == 1, then t1 < t2,
2) if sense == -1, then t1 > t2,
If there is a discrepancy between 'sense' and parameters of trimming, then 'sense' parameter has higher priority. If parameters t1 and t2 are equal and the curve is closed, then in result a closed curve should be obtained.

Parameters

[in]	t1	- Parameter corresponding to start of a trimmed curve.
[in]	t2	- Parameter corresponding to end of a trimmed curve.
[in]	sense	- Direction of a trimmed curve in relation to an initial curve. sense = 1 - direction does not change. sense = -1 - direction changes to the opposite value.
[in]	xyzEps	- Three-dimensional accuracy.
[in]	saveParLenAndLaw	- Save parametric length and law.

Returns: A constructed trimmed curve.

Warning: Under development.

The documentation for this class was generated from the following file:

cur_cubic_spline3d.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Function Documentation

◆ Create() [1/9]

◆ Create() [2/9]

◆ Create() [3/9]

◆ Create() [4/9]

◆ Create() [5/9]

◆ Create() [6/9]

◆ Create() [7/9]

◆ Create() [8/9]

◆ Create() [9/9]

◆ Duplicate()

◆ IsSame()

◆ SetEqual()

◆ Transform()

◆ Move()

◆ Rotate()

◆ GetProperties()

◆ SetProperties()

◆ PointOn()

◆ Explore()

◆ NurbsCurve() [1/2]

◆ NurbsCurve() [2/2]

◆ Trimmed() [1/3]

◆ GetMap()

◆ GetPlaneCurve()

◆ DistanceAlong()

◆ Step()

◆ DeviationStep()

◆ Trimmed() [2/3]

◆ Trimmed() [3/3]