IntCurve_IntConicConic Class Reference

Provides methods to intersect two conics. The exception ConstructionError is raised in constructors or in Perform methods when a domain (Domain from IntRes2d) is not correct, i-e when a Circle (Circ2d from gp) or an Ellipse (i-e Elips2d from gp) do not have a closed domain (use the SetEquivalentParameters method for a domain on a circle or an ellipse). More...

#include <IntCurve_IntConicConic.hxx>

Inheritance diagram for IntCurve_IntConicConic:

Public Member Functions
	IntCurve_IntConicConic ()
	Empty Constructor.
	IntCurve_IntConicConic (const gp_Lin2d &L1, const IntRes2d_Domain &D1, const gp_Lin2d &L2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 lines from gp.
void	Perform (const gp_Lin2d &L1, const IntRes2d_Domain &D1, const gp_Lin2d &L2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 lines from gp.
	IntCurve_IntConicConic (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Circ2d &C, const IntRes2d_Domain &DC, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and a circle. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
void	Perform (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Circ2d &C, const IntRes2d_Domain &DC, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and a circle. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
	IntCurve_IntConicConic (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Elips2d &E, const IntRes2d_Domain &DE, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and an ellipse. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
void	Perform (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Elips2d &E, const IntRes2d_Domain &DE, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and an ellipse. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
	IntCurve_IntConicConic (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and a parabola from gp.
void	Perform (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and a parabola from gp.
	IntCurve_IntConicConic (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and an hyperbola.
void	Perform (const gp_Lin2d &L, const IntRes2d_Domain &DL, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a line and an hyperbola.
	IntCurve_IntConicConic (const gp_Circ2d &C1, const IntRes2d_Domain &D1, const gp_Circ2d &C2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 circles from gp. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.
void	Perform (const gp_Circ2d &C1, const IntRes2d_Domain &D1, const gp_Circ2d &C2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 circles from gp. The exception ConstructionError is raised if the method IsClosed of the domain of one of the circle returns False.
	IntCurve_IntConicConic (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Elips2d &E, const IntRes2d_Domain &DE, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and an ellipse. The exception ConstructionError is raised if the method IsClosed of one the domain returns False.
void	Perform (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Elips2d &E, const IntRes2d_Domain &DE, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and an ellipse. The exception ConstructionError is raised if the method IsClosed of one the domain returns False.
	IntCurve_IntConicConic (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
void	Perform (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
	IntCurve_IntConicConic (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
void	Perform (const gp_Circ2d &C, const IntRes2d_Domain &DC, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a circle and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.
	IntCurve_IntConicConic (const gp_Elips2d &E1, const IntRes2d_Domain &D1, const gp_Elips2d &E2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 ellipses. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.
void	Perform (const gp_Elips2d &E1, const IntRes2d_Domain &D1, const gp_Elips2d &E2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 ellipses. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.
	IntCurve_IntConicConic (const gp_Elips2d &E, const IntRes2d_Domain &DE, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between an ellipse and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
void	Perform (const gp_Elips2d &E, const IntRes2d_Domain &DE, const gp_Parab2d &P, const IntRes2d_Domain &DP, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between an ellipse and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
	IntCurve_IntConicConic (const gp_Elips2d &E, const IntRes2d_Domain &DE, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between an ellipse and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
void	Perform (const gp_Elips2d &E, const IntRes2d_Domain &DE, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between an ellipse and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.
	IntCurve_IntConicConic (const gp_Parab2d &P1, const IntRes2d_Domain &D1, const gp_Parab2d &P2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 parabolas.
void	Perform (const gp_Parab2d &P1, const IntRes2d_Domain &D1, const gp_Parab2d &P2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 parabolas.
	IntCurve_IntConicConic (const gp_Parab2d &P, const IntRes2d_Domain &DP, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a parabola and an hyperbola.
void	Perform (const gp_Parab2d &P, const IntRes2d_Domain &DP, const gp_Hypr2d &H, const IntRes2d_Domain &DH, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between a parabola and an hyperbola.
	IntCurve_IntConicConic (const gp_Hypr2d &H1, const IntRes2d_Domain &D1, const gp_Hypr2d &H2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 hyperbolas.
void	Perform (const gp_Hypr2d &H1, const IntRes2d_Domain &D1, const gp_Hypr2d &H2, const IntRes2d_Domain &D2, const Standard_Real TolConf, const Standard_Real Tol)
	Intersection between 2 hyperbolas.
Public Member Functions inherited from IntRes2d_Intersection
Standard_Boolean	IsDone () const
	returns TRUE when the computation was successful.
Standard_Boolean	IsEmpty () const
	Returns TRUE if there is no intersection between the given arguments. The exception NotDone is raised if IsDone returns FALSE.
Standard_Integer	NbPoints () const
	This function returns the number of intersection points between the 2 curves. The exception NotDone is raised if IsDone returns FALSE.
const IntRes2d_IntersectionPoint &	Point (const Standard_Integer N) const
	This function returns the intersection point of range N; The exception NotDone is raised if IsDone returns FALSE. The exception OutOfRange is raised if (N <= 0) or (N > NbPoints).
Standard_Integer	NbSegments () const
	This function returns the number of intersection segments between the two curves. The exception NotDone is raised if IsDone returns FALSE.
const IntRes2d_IntersectionSegment &	Segment (const Standard_Integer N) const
	This function returns the intersection segment of range N; The exception NotDone is raised if IsDone returns FALSE. The exception OutOfRange is raised if (N <= 0) or (N > NbPoints).
void	SetReversedParameters (const Standard_Boolean Reverseflag)

Additional Inherited Members
Protected Member Functions inherited from IntRes2d_Intersection
	IntRes2d_Intersection ()
	Empty constructor.
	IntRes2d_Intersection (const IntRes2d_Intersection &Other)
IntRes2d_Intersection &	operator= (const IntRes2d_Intersection &theOther)
	Assignment.
	~IntRes2d_Intersection ()
	Destructor is protected, for safe inheritance.
void	SetValues (const IntRes2d_Intersection &Inter)
void	Append (const IntRes2d_Intersection &Inter, const Standard_Real FirstParam1, const Standard_Real LastParam1, const Standard_Real FirstParam2, const Standard_Real LastParam2)
void	Append (const IntRes2d_IntersectionSegment &Seg)
void	Append (const IntRes2d_IntersectionPoint &Pnt)
void	Insert (const IntRes2d_IntersectionPoint &Pnt)
void	ResetFields ()
Standard_Boolean	ReversedParameters () const
Protected Attributes inherited from IntRes2d_Intersection
IntRes2d_SequenceOfIntersectionPoint	lpnt
IntRes2d_SequenceOfIntersectionSegment	lseg
Standard_Boolean	done
Standard_Boolean	reverse

Detailed Description

Provides methods to intersect two conics. The exception ConstructionError is raised in constructors or in Perform methods when a domain (Domain from IntRes2d) is not correct, i-e when a Circle (Circ2d from gp) or an Ellipse (i-e Elips2d from gp) do not have a closed domain (use the SetEquivalentParameters method for a domain on a circle or an ellipse).

Constructor & Destructor Documentation

IntCurve_IntConicConic() [1/16]

IntCurve_IntConicConic::IntCurve_IntConicConic

(

)

Empty Constructor.

IntCurve_IntConicConic() [2/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Lin2d &	L1,
		const IntRes2d_Domain &	D1,
		const gp_Lin2d &	L2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 lines from gp.

IntCurve_IntConicConic() [3/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and a circle. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

IntCurve_IntConicConic() [4/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and an ellipse. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

IntCurve_IntConicConic() [5/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and a parabola from gp.

IntCurve_IntConicConic() [6/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and an hyperbola.

IntCurve_IntConicConic() [7/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Circ2d &	C1,
		const IntRes2d_Domain &	D1,
		const gp_Circ2d &	C2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 circles from gp. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.

IntCurve_IntConicConic() [8/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and an ellipse. The exception ConstructionError is raised if the method IsClosed of one the domain returns False.

IntCurve_IntConicConic() [9/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

IntCurve_IntConicConic() [10/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

IntCurve_IntConicConic() [11/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Elips2d &	E1,
		const IntRes2d_Domain &	D1,
		const gp_Elips2d &	E2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 ellipses. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.

IntCurve_IntConicConic() [12/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between an ellipse and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

IntCurve_IntConicConic() [13/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between an ellipse and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

IntCurve_IntConicConic() [14/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Parab2d &	P1,
		const IntRes2d_Domain &	D1,
		const gp_Parab2d &	P2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 parabolas.

IntCurve_IntConicConic() [15/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a parabola and an hyperbola.

IntCurve_IntConicConic() [16/16]

IntCurve_IntConicConic::IntCurve_IntConicConic	(	const gp_Hypr2d &	H1,
		const IntRes2d_Domain &	D1,
		const gp_Hypr2d &	H2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 hyperbolas.

Member Function Documentation

Perform() [1/15]

void IntCurve_IntConicConic::Perform	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and an ellipse. The exception ConstructionError is raised if the method IsClosed of one the domain returns False.

Perform() [2/15]

void IntCurve_IntConicConic::Perform	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

Perform() [3/15]

void IntCurve_IntConicConic::Perform	(	const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a circle and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

Perform() [4/15]

void IntCurve_IntConicConic::Perform	(	const gp_Circ2d &	C1,
		const IntRes2d_Domain &	D1,
		const gp_Circ2d &	C2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 circles from gp. The exception ConstructionError is raised if the method IsClosed of the domain of one of the circle returns False.

Perform() [5/15]

void IntCurve_IntConicConic::Perform	(	const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between an ellipse and an hyperbola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

Perform() [6/15]

void IntCurve_IntConicConic::Perform	(	const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between an ellipse and a parabola. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

Perform() [7/15]

void IntCurve_IntConicConic::Perform	(	const gp_Elips2d &	E1,
		const IntRes2d_Domain &	D1,
		const gp_Elips2d &	E2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 ellipses. The exception ConstructionError is raised if the method IsClosed of one of the domain returns False.

Perform() [8/15]

void IntCurve_IntConicConic::Perform	(	const gp_Hypr2d &	H1,
		const IntRes2d_Domain &	D1,
		const gp_Hypr2d &	H2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 hyperbolas.

Perform() [9/15]

void IntCurve_IntConicConic::Perform	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Circ2d &	C,
		const IntRes2d_Domain &	DC,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and a circle. The exception ConstructionError is raised if the method IsClosed of the domain of the circle returns False.

Perform() [10/15]

void IntCurve_IntConicConic::Perform	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Elips2d &	E,
		const IntRes2d_Domain &	DE,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and an ellipse. The exception ConstructionError is raised if the method IsClosed of the domain of the ellipse returns False.

Perform() [11/15]

void IntCurve_IntConicConic::Perform	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and an hyperbola.

Perform() [12/15]

void IntCurve_IntConicConic::Perform	(	const gp_Lin2d &	L,
		const IntRes2d_Domain &	DL,
		const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a line and a parabola from gp.

Perform() [13/15]

void IntCurve_IntConicConic::Perform	(	const gp_Lin2d &	L1,
		const IntRes2d_Domain &	D1,
		const gp_Lin2d &	L2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 lines from gp.

Perform() [14/15]

void IntCurve_IntConicConic::Perform	(	const gp_Parab2d &	P,
		const IntRes2d_Domain &	DP,
		const gp_Hypr2d &	H,
		const IntRes2d_Domain &	DH,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between a parabola and an hyperbola.

Perform() [15/15]

void IntCurve_IntConicConic::Perform	(	const gp_Parab2d &	P1,
		const IntRes2d_Domain &	D1,
		const gp_Parab2d &	P2,
		const IntRes2d_Domain &	D2,
		const Standard_Real	TolConf,
		const Standard_Real	Tol )

Intersection between 2 parabolas.

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

• IntCurve_IntConicConic.hxx