Open CASCADE Technology
7.1.0.beta

This algorithm converts a ellipse into a rational Bspline curve. The ellipse is represented an Elips2d from package gp with the parametrization : P (U) = Loc + (MajorRadius * Cos(U) * Xdir + MinorRadius * Sin(U) * Ydir) where Loc is the center of the ellipse, Xdir and Ydir are the normalized directions of the local cartesian coordinate system of the ellipse. The parametrization range is U [0, 2PI]. KeyWords : Convert, Ellipse, BSplineCurve, 2D . More...
#include <Convert_EllipseToBSplineCurve.hxx>
Public Member Functions  
Convert_EllipseToBSplineCurve (const gp_Elips2d &E, const Convert_ParameterisationType Parameterisation=Convert_TgtThetaOver2)  
The equivalent Bspline curve has the same orientation as the ellipse E. More...  
Convert_EllipseToBSplineCurve (const gp_Elips2d &E, const Standard_Real U1, const Standard_Real U2, const Convert_ParameterisationType Parameterisation=Convert_TgtThetaOver2)  
The ellipse E is limited between the parametric values U1, U2. The equivalent Bspline curve is oriented from U1 to U2 and has the same orientation as E. 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 
Additional Inherited Members  
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_HArray1OfPnt2d >  poles 
Handle< TColStd_HArray1OfReal >  weights 
Handle< TColStd_HArray1OfReal >  knots 
Handle< TColStd_HArray1OfInteger >  mults 
Standard_Integer  degree 
Standard_Integer  nbPoles 
Standard_Integer  nbKnots 
Standard_Boolean  isperiodic 
This algorithm converts a ellipse into a rational Bspline curve. The ellipse is represented an Elips2d from package gp with the parametrization : P (U) = Loc + (MajorRadius * Cos(U) * Xdir + MinorRadius * Sin(U) * Ydir) where Loc is the center of the ellipse, Xdir and Ydir are the normalized directions of the local cartesian coordinate system of the ellipse. The parametrization range is U [0, 2PI]. KeyWords : Convert, Ellipse, BSplineCurve, 2D .
Convert_EllipseToBSplineCurve::Convert_EllipseToBSplineCurve  (  const gp_Elips2d &  E, 
const Convert_ParameterisationType  Parameterisation = Convert_TgtThetaOver2 

) 
The equivalent Bspline curve has the same orientation as the ellipse E.
Convert_EllipseToBSplineCurve::Convert_EllipseToBSplineCurve  (  const gp_Elips2d &  E, 
const Standard_Real  U1,  
const Standard_Real  U2,  
const Convert_ParameterisationType  Parameterisation = Convert_TgtThetaOver2 

) 
The ellipse E is limited between the parametric values U1, U2. The equivalent Bspline curve is oriented from U1 to U2 and has the same orientation as E.
Raised if U1 = U2 or U1 = U2 + 2.0 * Pi