# Convert_ParabolaToBSplineCurve Class Reference

This algorithm converts a parabola into a non rational B-spline curve. The parabola is a Parab2d from package gp with the parametrization P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the apex of the parabola, Xdir is the normalized direction of the symmetry axis of the parabola, Ydir is the normalized direction of the directrix and F is the focal length. KeyWords : Convert, Parabola, BSplineCurve, 2D . More...

`#include <Convert_ParabolaToBSplineCurve.hxx>`

Inheritance diagram for Convert_ParabolaToBSplineCurve:
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## Public Member Functions

Convert_ParabolaToBSplineCurve (const gp_Parab2d &Prb, const Standard_Real U1, const Standard_Real U2)
The parabola Prb is limited between the parametric values U1, U2 and the equivalent B-spline curve as the same orientation as the parabola Prb. More...

Public Member Functions inherited from Convert_ConicToBSplineCurve
Standard_Integer Degree () const
Returns the degree of the BSpline curve whose data is computed in this framework. More...

Standard_Integer NbPoles () const
Returns the number of poles of the BSpline curve whose data is computed in this framework. More...

Standard_Integer NbKnots () const
Returns the number of knots of the BSpline curve whose data is computed in this framework. More...

Standard_Boolean IsPeriodic () const
Returns true if the BSpline curve whose data is computed in this framework is periodic. More...

gp_Pnt2d Pole (const Standard_Integer Index) const
Returns the pole of index Index to the poles table of the BSpline curve whose data is computed in this framework. Exceptions Standard_OutOfRange if Index is outside the bounds of the poles table of the BSpline curve whose data is computed in this framework. More...

Standard_Real Weight (const Standard_Integer Index) const
Returns the weight of the pole of index Index to the poles table of the BSpline curve whose data is computed in this framework. Exceptions Standard_OutOfRange if Index is outside the bounds of the poles table of the BSpline curve whose data is computed in this framework. More...

Standard_Real Knot (const Standard_Integer Index) const
Returns the knot of index Index to the knots table of the BSpline curve whose data is computed in this framework. Exceptions Standard_OutOfRange if Index is outside the bounds of the knots table of the BSpline curve whose data is computed in this framework. More...

Standard_Integer Multiplicity (const Standard_Integer Index) const
Returns the multiplicity of the knot of index Index to the knots table of the BSpline curve whose data is computed in this framework. Exceptions Standard_OutOfRange if Index is outside the bounds of the knots table of the BSpline curve whose data is computed in this framework. More...

void BuildCosAndSin (const Convert_ParameterisationType Parametrisation, Handle< TColStd_HArray1OfReal > &CosNumerator, Handle< TColStd_HArray1OfReal > &SinNumerator, Handle< TColStd_HArray1OfReal > &Denominator, Standard_Integer &Degree, Handle< TColStd_HArray1OfReal > &Knots, Handle< TColStd_HArray1OfInteger > &Mults) const

void BuildCosAndSin (const Convert_ParameterisationType Parametrisation, const Standard_Real UFirst, const Standard_Real ULast, Handle< TColStd_HArray1OfReal > &CosNumerator, Handle< TColStd_HArray1OfReal > &SinNumerator, Handle< TColStd_HArray1OfReal > &Denominator, Standard_Integer &Degree, Handle< TColStd_HArray1OfReal > &Knots, Handle< TColStd_HArray1OfInteger > &Mults) const

Protected Member Functions inherited from Convert_ConicToBSplineCurve
Convert_ConicToBSplineCurve (const Standard_Integer NumberOfPoles, const Standard_Integer NumberOfKnots, const Standard_Integer Degree)

Protected Attributes inherited from Convert_ConicToBSplineCurve
Handle< TColgp_HArray1OfPnt2dpoles

Handle< TColStd_HArray1OfRealweights

Handle< TColStd_HArray1OfRealknots

Handle< TColStd_HArray1OfIntegermults

Standard_Integer degree

Standard_Integer nbPoles

Standard_Integer nbKnots

Standard_Boolean isperiodic

## Detailed Description

This algorithm converts a parabola into a non rational B-spline curve. The parabola is a Parab2d from package gp with the parametrization P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the apex of the parabola, Xdir is the normalized direction of the symmetry axis of the parabola, Ydir is the normalized direction of the directrix and F is the focal length. KeyWords : Convert, Parabola, BSplineCurve, 2D .

## Constructor & Destructor Documentation

 Convert_ParabolaToBSplineCurve::Convert_ParabolaToBSplineCurve ( const gp_Parab2d & Prb, const Standard_Real U1, const Standard_Real U2 )

The parabola Prb is limited between the parametric values U1, U2 and the equivalent B-spline curve as the same orientation as the parabola Prb.

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