ProjLib_ComputeApproxOnPolarSurface Class Reference

Approximate the projection of a 3d curve on an polar surface and stores the result in Approx. The result is a 2d curve. The evaluation of the current point of the 2d curve is done with the evaluation of the extrema P3d - Surface. 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_ComputeApproxOnPolarSurface.hxx>

Public Member Functions
	ProjLib_ComputeApproxOnPolarSurface ()
	Empty constructor, it only sets some initial values for class fields.
	ProjLib_ComputeApproxOnPolarSurface (const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S, const double Tol=1.0e-4)
	Constructor, which performs projecting.
	ProjLib_ComputeApproxOnPolarSurface (const occ::handle< Adaptor2d_Curve2d > &InitCurve2d, const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S, const double Tol)
	Constructor, which performs projecting, using initial curve 2d InitCurve2d, which is any rough approximation of result curve. Parameter Tol is 3d tolerance of approximation.
	ProjLib_ComputeApproxOnPolarSurface (const occ::handle< Adaptor2d_Curve2d > &InitCurve2d, const occ::handle< Adaptor2d_Curve2d > &InitCurve2dBis, const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S, const double Tol)
	Constructor, which performs projecting, using two initial curves 2d: InitCurve2d and InitCurve2dBis that are any rough approximations of result curves. This constructor is used to get two pcurves for seem edge. Parameter Tol is 3d tolerance of approximation.
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 min = 2, max = 8.
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.
void	SetMaxDist (const double theMaxDist)
	Set the parameter, which defines maximal possible distance between projected curve and surface. It is used only for projecting on not analytical surfaces. If theMaxDist < 0, algorithm uses default value 100.*Tolerance. If real distance between curve and surface more then theMaxDist, algorithm stops working.
void	SetTolerance (const double theTolerance)
	Set the tolerance used to project the curve on the surface. Default value is Precision::Approximation().
void	Perform (const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S)
	Method, which performs projecting, using default values of parameters or they must be set by corresponding methods before using.
occ::handle< Geom2d_BSplineCurve >	Perform (const occ::handle< Adaptor2d_Curve2d > &InitCurve2d, const occ::handle< Adaptor3d_Curve > &C, const occ::handle< Adaptor3d_Surface > &S)
	Method, which performs projecting, using default values of parameters or they must be set by corresponding methods before using. Parameter InitCurve2d is any rough estimation of 2d result curve.
occ::handle< Adaptor2d_Curve2d >	BuildInitialCurve2d (const occ::handle< Adaptor3d_Curve > &Curve, const occ::handle< Adaptor3d_Surface > &S)
	Builds initial 2d curve as BSpline with degree = 1 using Extrema algorithm. Method is used in method Perform(...).
occ::handle< Geom2d_BSplineCurve >	ProjectUsingInitialCurve2d (const occ::handle< Adaptor3d_Curve > &Curve, const occ::handle< Adaptor3d_Surface > &S, const occ::handle< Adaptor2d_Curve2d > &InitCurve2d)
	Method, which performs projecting. Method is used in method Perform(...).
occ::handle< Geom2d_BSplineCurve >	BSpline () const
	Returns result curve 2d.
occ::handle< Geom2d_Curve >	Curve2d () const
	Returns second 2d curve.
bool	IsDone () const
double	Tolerance () const
	returns the reached Tolerance.

Detailed Description

Approximate the projection of a 3d curve on an polar surface and stores the result in Approx. The result is a 2d curve. The evaluation of the current point of the 2d curve is done with the evaluation of the extrema P3d - Surface. 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_ComputeApproxOnPolarSurface() [1/4]

ProjLib_ComputeApproxOnPolarSurface::ProjLib_ComputeApproxOnPolarSurface

(

)

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

ProjLib_ComputeApproxOnPolarSurface() [2/4]

ProjLib_ComputeApproxOnPolarSurface::ProjLib_ComputeApproxOnPolarSurface	(	const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S,
		const double	Tol = 1.0e-4 )

Constructor, which performs projecting.

ProjLib_ComputeApproxOnPolarSurface() [3/4]

ProjLib_ComputeApproxOnPolarSurface::ProjLib_ComputeApproxOnPolarSurface	(	const occ::handle< Adaptor2d_Curve2d > &	InitCurve2d,
		const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S,
		const double	Tol )

Constructor, which performs projecting, using initial curve 2d InitCurve2d, which is any rough approximation of result curve. Parameter Tol is 3d tolerance of approximation.

ProjLib_ComputeApproxOnPolarSurface() [4/4]

ProjLib_ComputeApproxOnPolarSurface::ProjLib_ComputeApproxOnPolarSurface	(	const occ::handle< Adaptor2d_Curve2d > &	InitCurve2d,
		const occ::handle< Adaptor2d_Curve2d > &	InitCurve2dBis,
		const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S,
		const double	Tol )

Constructor, which performs projecting, using two initial curves 2d: InitCurve2d and InitCurve2dBis that are any rough approximations of result curves. This constructor is used to get two pcurves for seem edge. Parameter Tol is 3d tolerance of approximation.

Member Function Documentation

BSpline()

occ::handle< Geom2d_BSplineCurve > ProjLib_ComputeApproxOnPolarSurface::BSpline

(

)

const

Returns result curve 2d.

BuildInitialCurve2d()

occ::handle< Adaptor2d_Curve2d > ProjLib_ComputeApproxOnPolarSurface::BuildInitialCurve2d	(	const occ::handle< Adaptor3d_Curve > &	Curve,
		const occ::handle< Adaptor3d_Surface > &	S )

Builds initial 2d curve as BSpline with degree = 1 using Extrema algorithm. Method is used in method Perform(...).

Curve2d()

occ::handle< Geom2d_Curve > ProjLib_ComputeApproxOnPolarSurface::Curve2d

(

)

const

Returns second 2d curve.

IsDone()

bool ProjLib_ComputeApproxOnPolarSurface::IsDone

(

)

const

Perform() [1/2]

occ::handle< Geom2d_BSplineCurve > ProjLib_ComputeApproxOnPolarSurface::Perform	(	const occ::handle< Adaptor2d_Curve2d > &	InitCurve2d,
		const occ::handle< Adaptor3d_Curve > &	C,
		const occ::handle< Adaptor3d_Surface > &	S )

Method, which performs projecting, using default values of parameters or they must be set by corresponding methods before using. Parameter InitCurve2d is any rough estimation of 2d result curve.

Perform() [2/2]

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

Method, which performs projecting, using default values of parameters or they must be set by corresponding methods before using.

ProjectUsingInitialCurve2d()

occ::handle< Geom2d_BSplineCurve > ProjLib_ComputeApproxOnPolarSurface::ProjectUsingInitialCurve2d	(	const occ::handle< Adaptor3d_Curve > &	Curve,
		const occ::handle< Adaptor3d_Surface > &	S,
		const occ::handle< Adaptor2d_Curve2d > &	InitCurve2d )

Method, which performs projecting. Method is used in method Perform(...).

SetBndPnt()

void ProjLib_ComputeApproxOnPolarSurface::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_ComputeApproxOnPolarSurface::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 min = 2, max = 8.

SetMaxDist()

void ProjLib_ComputeApproxOnPolarSurface::SetMaxDist

(

const double

theMaxDist

)

Set the parameter, which defines maximal possible distance between projected curve and surface. It is used only for projecting on not analytical surfaces. If theMaxDist < 0, algorithm uses default value 100.*Tolerance. If real distance between curve and surface more then theMaxDist, algorithm stops working.

SetMaxSegments()

void ProjLib_ComputeApproxOnPolarSurface::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_ComputeApproxOnPolarSurface::SetTolerance

(

const double

theTolerance

)

Set the tolerance used to project the curve on the surface. Default value is Precision::Approximation().

Tolerance()

double ProjLib_ComputeApproxOnPolarSurface::Tolerance

(

)

const

returns the reached Tolerance.

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

• ProjLib_ComputeApproxOnPolarSurface.hxx