Describes functions for computing all the extrema between a curve and a surface. An ExtremaCurveSurface algorithm minimizes or maximizes the distance between a point on the curve and a point on the surface. Thus, it computes start and end points of perpendiculars common to the curve and the surface (an intersection point is not an extremum except where the curve and the surface are tangential at this point). Solutions consist of pairs of points, and an extremum is considered to be a segment joining the two points of a solution. An ExtremaCurveSurface object provides a framework for: More...

#include <GeomAPI_ExtremaCurveSurface.hxx>

Public Member Functions
	GeomAPI_ExtremaCurveSurface ()
	Constructs an empty algorithm for computing extrema between a curve and a surface. Use an Init function to define the curve and the surface on which it is going to work.

	GeomAPI_ExtremaCurveSurface (const occ::handle< Geom_Curve > &Curve, const occ::handle< Geom_Surface > &Surface)
	Computes the extrema distances between the curve `and the surface .`

	GeomAPI_ExtremaCurveSurface (const occ::handle< Geom_Curve > &Curve, const occ::handle< Geom_Surface > &Surface, const double Wmin, const double Wmax, const double Umin, const double Umax, const double Vmin, const double Vmax)
	Computes the extrema distances between the curve `and the surface . The solution point are computed in the domain [Wmin,Wmax] of the curve and in the domain [Umin,Umax] [Vmin,Vmax] of the surface. Warning Use the function NbExtrema to obtain the number of solutions. If this algorithm fails, NbExtrema returns 0.`

void	Init (const occ::handle< Geom_Curve > &Curve, const occ::handle< Geom_Surface > &Surface)
	Computes the extrema distances between the curve `and the surface .`

void	Init (const occ::handle< Geom_Curve > &Curve, const occ::handle< Geom_Surface > &Surface, const double Wmin, const double Wmax, const double Umin, const double Umax, const double Vmin, const double Vmax)
	Computes the extrema distances between the curve `and the surface . The solution point are computed in the domain [Wmin,Wmax] of the curve and in the domain [Umin,Umax] [Vmin,Vmax] of the surface. Warning Use the function NbExtrema to obtain the number of solutions. If this algorithm fails, NbExtrema returns 0.`

int	NbExtrema () const
	Returns the number of extrema computed by this algorithm. Note: if this algorithm fails, NbExtrema returns 0.

	operator int () const

void	Points (const int Index, gp_Pnt &P1, gp_Pnt &P2) const
	Returns the points P1 on the curve and P2 on the surface, which are the ends of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

void	Parameters (const int Index, double &W, double &U, double &V) const
	Returns the parameters W of the point on the curve, and (U,V) of the point on the surface, which are the ends of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

double	Distance (const int Index) const
	Computes the distance between the end points of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

bool	IsParallel () const
	Returns True if the curve is on a parallel surface.

void	NearestPoints (gp_Pnt &PC, gp_Pnt &PS) const
	Returns the points PC on the curve and PS on the surface, which are the ends of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

void	LowerDistanceParameters (double &W, double &U, double &V) const
	Returns the parameters W of the point on the curve and (U,V) of the point on the surface, which are the ends of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

double	LowerDistance () const
	Computes the distance between the end points of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

	operator double () const

const Extrema_ExtCS &	Extrema () const
	Returns the algorithmic object from Extrema.

Detailed Description

Describes functions for computing all the extrema between a curve and a surface. An ExtremaCurveSurface algorithm minimizes or maximizes the distance between a point on the curve and a point on the surface. Thus, it computes start and end points of perpendiculars common to the curve and the surface (an intersection point is not an extremum except where the curve and the surface are tangential at this point). Solutions consist of pairs of points, and an extremum is considered to be a segment joining the two points of a solution. An ExtremaCurveSurface object provides a framework for:

defining the construction of the extrema,
implementing the construction algorithm, and
consulting the results. Warning In some cases, the nearest points between a curve and a surface do not correspond to one of the computed extrema. Instead, they may be given by:
a point of a bounding curve of the surface and one of the following:
its orthogonal projection on the curve,
a limit point of the curve; or
a limit point of the curve and its projection on the surface; or
an intersection point between the curve and the surface.

Constructor & Destructor Documentation

◆ GeomAPI_ExtremaCurveSurface() [1/3]

GeomAPI_ExtremaCurveSurface::GeomAPI_ExtremaCurveSurface ( )

Constructs an empty algorithm for computing extrema between a curve and a surface. Use an Init function to define the curve and the surface on which it is going to work.

◆ GeomAPI_ExtremaCurveSurface() [2/3]

GeomAPI_ExtremaCurveSurface::GeomAPI_ExtremaCurveSurface	(	const occ::handle< Geom_Curve > &	Curve,
		const occ::handle< Geom_Surface > &	Surface )

Computes the extrema distances between the curve and the surface .

◆ GeomAPI_ExtremaCurveSurface() [3/3]

GeomAPI_ExtremaCurveSurface::GeomAPI_ExtremaCurveSurface	(	const occ::handle< Geom_Curve > &	Curve,
		const occ::handle< Geom_Surface > &	Surface,
		const double	Wmin,
		const double	Wmax,
		const double	Umin,
		const double	Umax,
		const double	Vmin,
		const double	Vmax )

Computes the extrema distances between the curve and the surface . The solution point are computed in the domain [Wmin,Wmax] of the curve and in the domain [Umin,Umax] [Vmin,Vmax] of the surface. Warning Use the function NbExtrema to obtain the number of solutions. If this algorithm fails, NbExtrema returns 0.

Member Function Documentation

◆ Distance()

double GeomAPI_ExtremaCurveSurface::Distance ( const int Index ) const

Computes the distance between the end points of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

◆ Extrema()

const Extrema_ExtCS & GeomAPI_ExtremaCurveSurface::Extrema ( ) const

Returns the algorithmic object from Extrema.

◆ Init() [1/2]

void GeomAPI_ExtremaCurveSurface::Init	(	const occ::handle< Geom_Curve > &	Curve,
		const occ::handle< Geom_Surface > &	Surface )

Computes the extrema distances between the curve and the surface .

◆ Init() [2/2]

void GeomAPI_ExtremaCurveSurface::Init	(	const occ::handle< Geom_Curve > &	Curve,
		const occ::handle< Geom_Surface > &	Surface,
		const double	Wmin,
		const double	Wmax,
		const double	Umin,
		const double	Umax,
		const double	Vmin,
		const double	Vmax )

Computes the extrema distances between the curve and the surface . The solution point are computed in the domain [Wmin,Wmax] of the curve and in the domain [Umin,Umax] [Vmin,Vmax] of the surface. Warning Use the function NbExtrema to obtain the number of solutions. If this algorithm fails, NbExtrema returns 0.

◆ IsParallel()

bool GeomAPI_ExtremaCurveSurface::IsParallel ( ) const

inline

Returns True if the curve is on a parallel surface.

◆ LowerDistance()

double GeomAPI_ExtremaCurveSurface::LowerDistance ( ) const

Computes the distance between the end points of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

◆ LowerDistanceParameters()

void GeomAPI_ExtremaCurveSurface::LowerDistanceParameters	(	double &	W,
		double &	U,
		double &	V ) const

Returns the parameters W of the point on the curve and (U,V) of the point on the surface, which are the ends of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

◆ NbExtrema()

int GeomAPI_ExtremaCurveSurface::NbExtrema ( ) const

Returns the number of extrema computed by this algorithm. Note: if this algorithm fails, NbExtrema returns 0.

◆ NearestPoints()

void GeomAPI_ExtremaCurveSurface::NearestPoints	(	gp_Pnt &	PC,
		gp_Pnt &	PS ) const

Returns the points PC on the curve and PS on the surface, which are the ends of the shortest extremum computed by this algorithm. Exceptions - StdFail_NotDone if this algorithm fails.

◆ operator double()

GeomAPI_ExtremaCurveSurface::operator double ( ) const

◆ operator int()

GeomAPI_ExtremaCurveSurface::operator int ( ) const

◆ Parameters()

void GeomAPI_ExtremaCurveSurface::Parameters	(	const int	Index,
		double &	W,
		double &	U,
		double &	V ) const

Returns the parameters W of the point on the curve, and (U,V) of the point on the surface, which are the ends of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

◆ Points()

void GeomAPI_ExtremaCurveSurface::Points	(	const int	Index,
		gp_Pnt &	P1,
		gp_Pnt &	P2 ) const

Returns the points P1 on the curve and P2 on the surface, which are the ends of the extremum of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is not in the range [ 1,NbExtrema ], where NbExtrema is the number of extrema computed by this algorithm.

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

GeomAPI_ExtremaCurveSurface.hxx

Public Member Functions