Approximate the projection of a 3d curve on an analytic surface and stores the result in Approx. The result is a 2d curve. For approximation some parameters are used, including required tolerance of approximation. Tolerance is maximal possible value of 3d deviation of 3d projection of projected curve from "exact" 3d projection. Since algorithm searches 2d curve on surface, required 2d tolerance is computed from 3d tolerance with help of U,V resolutions of surface. 3d and 2d tolerances have sense only for curves on surface, it defines precision of projecting and approximation and have nothing to do with distance between the projected curve and the surface. More...

#include <ProjLib_ComputeApprox.hxx>

Public Member Functions
	ProjLib_ComputeApprox ()
	Empty constructor, it only sets some initial values for class fields.

	ProjLib_ComputeApprox (const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S, const double Tol)
	<Tol> is the tolerance with which the approximation is performed. Other parameters for approximation have default values.

void	Perform (const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S)
	Performs projecting. In case of approximation current values of parameters are used: default values or set by corresponding methods Set...

void	SetTolerance (const double theTolerance)
	Set tolerance of approximation. Default value is Precision::Confusion().

void	SetDegree (const int theDegMin, const int theDegMax)
	Set min and max possible degree of result BSpline curve2d, which is got by approximation. If theDegMin/Max < 0, algorithm uses values that are chosen depending of types curve 3d and surface.

void	SetMaxSegments (const int theMaxSegments)
	Set the parameter, which defines maximal value of parametric intervals the projected curve can be cut for approximation. If theMaxSegments < 0, algorithm uses default value = 1000.

void	SetBndPnt (const AppParCurves_Constraint theBndPnt)
	Set the parameter, which defines type of boundary condition between segments during approximation. It can be AppParCurves_PassPoint or AppParCurves_TangencyPoint. Default value is AppParCurves_TangencyPoint;.

occ::handle< Geom2d_BSplineCurve >	BSpline () const

occ::handle< Geom2d_BezierCurve >	Bezier () const

double	Tolerance () const
	returns the reached Tolerance.

Detailed Description

Approximate the projection of a 3d curve on an analytic surface and stores the result in Approx. The result is a 2d curve. For approximation some parameters are used, including required tolerance of approximation. Tolerance is maximal possible value of 3d deviation of 3d projection of projected curve from "exact" 3d projection. Since algorithm searches 2d curve on surface, required 2d tolerance is computed from 3d tolerance with help of U,V resolutions of surface. 3d and 2d tolerances have sense only for curves on surface, it defines precision of projecting and approximation and have nothing to do with distance between the projected curve and the surface.

Constructor & Destructor Documentation

◆ ProjLib_ComputeApprox() [1/2]

ProjLib_ComputeApprox::ProjLib_ComputeApprox ( )

Empty constructor, it only sets some initial values for class fields.

◆ ProjLib_ComputeApprox() [2/2]

ProjLib_ComputeApprox::ProjLib_ComputeApprox	(	const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S,
		const double	Tol )

<Tol> is the tolerance with which the approximation is performed. Other parameters for approximation have default values.

Member Function Documentation

◆ Bezier()

occ::handle< Geom2d_BezierCurve > ProjLib_ComputeApprox::Bezier ( ) const

◆ BSpline()

occ::handle< Geom2d_BSplineCurve > ProjLib_ComputeApprox::BSpline ( ) const

◆ Perform()

void ProjLib_ComputeApprox::Perform	(	const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S )

Performs projecting. In case of approximation current values of parameters are used: default values or set by corresponding methods Set...

◆ SetBndPnt()

void ProjLib_ComputeApprox::SetBndPnt ( const AppParCurves_Constraint theBndPnt )

Set the parameter, which defines type of boundary condition between segments during approximation. It can be AppParCurves_PassPoint or AppParCurves_TangencyPoint. Default value is AppParCurves_TangencyPoint;.

◆ SetDegree()

void ProjLib_ComputeApprox::SetDegree	(	const int	theDegMin,
		const int	theDegMax )

Set min and max possible degree of result BSpline curve2d, which is got by approximation. If theDegMin/Max < 0, algorithm uses values that are chosen depending of types curve 3d and surface.

◆ SetMaxSegments()

void ProjLib_ComputeApprox::SetMaxSegments ( const int theMaxSegments )

Set the parameter, which defines maximal value of parametric intervals the projected curve can be cut for approximation. If theMaxSegments < 0, algorithm uses default value = 1000.

◆ SetTolerance()

void ProjLib_ComputeApprox::SetTolerance ( const double theTolerance )

Set tolerance of approximation. Default value is Precision::Confusion().

◆ Tolerance()

double ProjLib_ComputeApprox::Tolerance ( ) const

returns the reached Tolerance.

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

ProjLib_ComputeApprox.hxx

Public Member Functions