Computes a 2D curve using an algorithm which minimizes tension, sagging, and jerk energy. As in FairCurve_Batten, two reference points are used. Unlike that class, FairCurve_MinimalVariation requires curvature settings at the first and second reference points. These are defined by the rays of curvature desired at each point. More...

#include <FairCurve_MinimalVariation.hxx>

Inheritance diagram for FairCurve_MinimalVariation:

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Public Member Functions
	FairCurve_MinimalVariation (const gp_Pnt2d &P1, const gp_Pnt2d &P2, const Standard_Real Heigth, const Standard_Real Slope=0, const Standard_Real PhysicalRatio=0)
	Constructs the two contact points P1 and P2 and the geometrical characteristics of the batten (elastic beam) These include the real number values for height of deformation Height, slope value Slope, and kind of energy PhysicalRatio. The kinds of energy include:

void	SetCurvature1 (const Standard_Real Curvature)
	Allows you to set a new constraint on curvature at the first point.

void	SetCurvature2 (const Standard_Real Curvature)
	Allows you to set a new constraint on curvature at the second point.

void	SetPhysicalRatio (const Standard_Real Ratio)
	Allows you to set the physical ratio Ratio. The kinds of energy which you can specify include: 0 is only "Jerk" Energy 1 is only "Sagging" Energy like batten Warning: if Ratio is 1 it is impossible to impose curvature constraints. Raises DomainError if Ratio < 0 or Ratio > 1.

virtual Standard_Boolean	Compute (FairCurve_AnalysisCode &ACode, const Standard_Integer NbIterations=50, const Standard_Real Tolerance=1.0e-3) override
	Computes the curve with respect to the constraints, NbIterations and Tolerance. The tolerance setting allows you to control the precision of computation, and the maximum number of iterations allows you to set a limit on computation time.

Standard_Real	GetCurvature1 () const
	Returns the first established curvature.

Standard_Real	GetCurvature2 () const
	Returns the second established curvature.

Standard_Real	GetPhysicalRatio () const
	Returns the physical ratio, or kind of energy.

virtual void	Dump (Standard_OStream &o) const override
	Prints on the stream o information on the current state of the object. Is used to redefine the operator <<.

Public Member Functions inherited from FairCurve_Batten
	FairCurve_Batten (const gp_Pnt2d &P1, const gp_Pnt2d &P2, const Standard_Real Height, const Standard_Real Slope=0)
	Constructor with the two points and the geometrical characteristics of the batten (elastic beam) Height is the height of the deformation, and Slope is the slope value, initialized at 0. The user can then supply the desired slope value by the method, SetSlope. Other parameters are initialized as follow :

virtual	~FairCurve_Batten ()

void	SetFreeSliding (const Standard_Boolean FreeSliding)
	Freesliding is initialized with the default setting false. When Freesliding is set to true and, as a result, sliding is free, the sliding factor is automatically computed to satisfy the equilibrium of the batten.

void	SetConstraintOrder1 (const Standard_Integer ConstraintOrder)
	Allows you to change the order of the constraint on the first point. ConstraintOrder has the default setting of 1. The following settings are available:

void	SetConstraintOrder2 (const Standard_Integer ConstraintOrder)
	Allows you to change the order of the constraint on the second point. ConstraintOrder is initialized with the default setting of 1. The following settings are available:

void	SetP1 (const gp_Pnt2d &P1)
	Allows you to change the location of the point, P1, and in doing so, modify the curve. Warning This method changes the angle as well as the point. Exceptions NullValue if the distance between P1 and P2 is less than or equal to the tolerance value for distance in Precision::Confusion: P1.IsEqual(P2, Precision::Confusion()). The function gp_Pnt2d::IsEqual tests to see if this is the case.

void	SetP2 (const gp_Pnt2d &P2)
	Allows you to change the location of the point, P1, and in doing so, modify the curve. Warning This method changes the angle as well as the point. Exceptions NullValue if the distance between P1 and P2 is less than or equal to the tolerance value for distance in Precision::Confusion: P1.IsEqual(P2, Precision::Confusion()). The function gp_Pnt2d::IsEqual tests to see if this is the case.

void	SetAngle1 (const Standard_Real Angle1)
	Allows you to change the angle Angle1 at the first point, P1. The default setting is 0.

void	SetAngle2 (const Standard_Real Angle2)
	Allows you to change the angle Angle2 at the second point, P2. The default setting is 0.

void	SetHeight (const Standard_Real Height)
	Allows you to change the height of the deformation. Raises NegativeValue; – if Height <= 0 if Height <= 0.

void	SetSlope (const Standard_Real Slope)
	Allows you to set the slope value, Slope.

void	SetSlidingFactor (const Standard_Real SlidingFactor)
	Allows you to change the ratio SlidingFactor. This compares the length of the batten and the reference length, which is, in turn, a function of the constraints. This modification has one of the following two effects:

Standard_Real	SlidingOfReference () const
	Computes the real number value for length Sliding of Reference for new constraints. If you want to give a specific length to a batten curve, use the following syntax: b.SetSlidingFactor(L / b.SlidingOfReference()) where b is the name of the batten curve object.

Standard_Boolean	GetFreeSliding () const
	Returns the initial free sliding value, false by default. Free sliding is generally more aesthetically pleasing than constrained sliding. However, the computation can fail with values such as angles greater than PI/2. This is because the resulting batten length is theoretically infinite.

Standard_Integer	GetConstraintOrder1 () const
	Returns the established first constraint order.

Standard_Integer	GetConstraintOrder2 () const
	Returns the established second constraint order.

const gp_Pnt2d &	GetP1 () const
	Returns the established location of the point P1.

const gp_Pnt2d &	GetP2 () const
	Returns the established location of the point P2.

Standard_Real	GetAngle1 () const
	Returns the established first angle.

Standard_Real	GetAngle2 () const
	Returns the established second angle.

Standard_Real	GetHeight () const
	Returns the thickness of the lathe.

Standard_Real	GetSlope () const
	Returns the established slope value.

Standard_Real	GetSlidingFactor () const
	Returns the initial sliding factor.

Handle< Geom2d_BSplineCurve >	Curve () const
	Returns the computed curve a 2d BSpline.

Additional Inherited Members
Protected Member Functions inherited from FairCurve_Batten
Standard_Real	SlidingOfReference (const Standard_Real D, const Standard_Real A1, const Standard_Real A2) const

Standard_Real	Compute (const Standard_Real D, const Standard_Real A1, const Standard_Real A2) const

Standard_Real	Compute (const Standard_Real D, const Standard_Real A) const
	Returns the effective geometrical constraints at the last batten computation. This effectives values may be not equal with the wanted values if.

Protected Attributes inherited from FairCurve_Batten
FairCurve_AnalysisCode	myCode

gp_Pnt2d	OldP1

gp_Pnt2d	OldP2

Standard_Real	OldAngle1

Standard_Real	OldAngle2

Standard_Real	OldHeight

Standard_Real	OldSlope

Standard_Real	OldSlidingFactor

Standard_Boolean	OldFreeSliding

Standard_Integer	OldConstraintOrder1

Standard_Integer	OldConstraintOrder2

gp_Pnt2d	NewP1

gp_Pnt2d	NewP2

Standard_Real	NewAngle1

Standard_Real	NewAngle2

Standard_Real	NewHeight

Standard_Real	NewSlope

Standard_Real	NewSlidingFactor

Standard_Boolean	NewFreeSliding

Standard_Integer	NewConstraintOrder1

Standard_Integer	NewConstraintOrder2

Standard_Integer	Degree

Handle< TColgp_HArray1OfPnt2d >	Poles

Handle< TColStd_HArray1OfReal >	Flatknots

Handle< TColStd_HArray1OfReal >	Knots

Handle< TColStd_HArray1OfInteger >	Mults

Detailed Description

Computes a 2D curve using an algorithm which minimizes tension, sagging, and jerk energy. As in FairCurve_Batten, two reference points are used. Unlike that class, FairCurve_MinimalVariation requires curvature settings at the first and second reference points. These are defined by the rays of curvature desired at each point.

Constructor & Destructor Documentation

◆ FairCurve_MinimalVariation()

FairCurve_MinimalVariation::FairCurve_MinimalVariation	(	const gp_Pnt2d &	P1,
		const gp_Pnt2d &	P2,
		const Standard_Real	Heigth,
		const Standard_Real	Slope = 0,
		const Standard_Real	PhysicalRatio = 0 )

Constructs the two contact points P1 and P2 and the geometrical characteristics of the batten (elastic beam) These include the real number values for height of deformation Height, slope value Slope, and kind of energy PhysicalRatio. The kinds of energy include:

Jerk (0)
Sagging (1). Note that the default setting for Physical Ration is in FairCurve_Batten Other parameters are initialized as follow :
FreeSliding = False
ConstraintOrder1 = 1
ConstraintOrder2 = 1
Angle1 = 0
Angle2 = 0
Curvature1 = 0
Curvature2 = 0
SlidingFactor = 1 Warning If PhysicalRatio equals 1, you cannot impose constraints on curvature. Exceptions NegativeValue if Height is less than or equal to 0. NullValue if the distance between P1 and P2 is less than or equal to the tolerance value for distance in Precision::Confusion: P1.IsEqual(P2, Precision::Confusion()). The function gp_Pnt2d::IsEqual tests to see if this is the case. Definition of the geometricals constraints

Member Function Documentation

◆ Compute()

virtual Standard_Boolean FairCurve_MinimalVariation::Compute	(	FairCurve_AnalysisCode &	ACode,
		const Standard_Integer	NbIterations = 50,
		const Standard_Real	Tolerance = 1.0e-3 )

overridevirtual

Computes the curve with respect to the constraints, NbIterations and Tolerance. The tolerance setting allows you to control the precision of computation, and the maximum number of iterations allows you to set a limit on computation time.

Reimplemented from FairCurve_Batten.

◆ Dump()

virtual void FairCurve_MinimalVariation::Dump ( Standard_OStream & o ) const

overridevirtual

Prints on the stream o information on the current state of the object. Is used to redefine the operator <<.

Reimplemented from FairCurve_Batten.

◆ GetCurvature1()

Standard_Real FairCurve_MinimalVariation::GetCurvature1 ( ) const

Returns the first established curvature.

◆ GetCurvature2()

Standard_Real FairCurve_MinimalVariation::GetCurvature2 ( ) const

Returns the second established curvature.

◆ GetPhysicalRatio()

Standard_Real FairCurve_MinimalVariation::GetPhysicalRatio ( ) const

Returns the physical ratio, or kind of energy.

◆ SetCurvature1()

void FairCurve_MinimalVariation::SetCurvature1 ( const Standard_Real Curvature )

Allows you to set a new constraint on curvature at the first point.

◆ SetCurvature2()

void FairCurve_MinimalVariation::SetCurvature2 ( const Standard_Real Curvature )

Allows you to set a new constraint on curvature at the second point.

◆ SetPhysicalRatio()

void FairCurve_MinimalVariation::SetPhysicalRatio ( const Standard_Real Ratio )

Allows you to set the physical ratio Ratio. The kinds of energy which you can specify include: 0 is only "Jerk" Energy 1 is only "Sagging" Energy like batten Warning: if Ratio is 1 it is impossible to impose curvature constraints. Raises DomainError if Ratio < 0 or Ratio > 1.

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

FairCurve_MinimalVariation.hxx

Public Member Functions

Additional Inherited Members