This algorithm converts a ellipse into a rational B-spline 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 B-spline curve has the same orientation as the ellipse E. | |
| 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 B-spline curve is oriented from U1 to U2 and has the same orientation as E. | |
 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. | |
| Standard_Integer | NbPoles () const |
| Returns the number of poles of the BSpline curve whose data is computed in this framework. | |
| Standard_Integer | NbKnots () const |
| Returns the number of knots of the BSpline curve whose data is computed in this framework. | |
| Standard_Boolean | IsPeriodic () const |
| Returns true if the BSpline curve whose data is computed in this framework is periodic. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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 |
Detailed Description
This algorithm converts a ellipse into a rational B-spline 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 .
Constructor & Destructor Documentation
◆ Convert_EllipseToBSplineCurve() [1/2]
| Convert_EllipseToBSplineCurve::Convert_EllipseToBSplineCurve | ( | const gp_Elips2d & | E, |
| const Convert_ParameterisationType | Parameterisation = Convert_TgtThetaOver2 ) |
The equivalent B-spline curve has the same orientation as the ellipse E.
◆ Convert_EllipseToBSplineCurve() [2/2]
| 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 B-spline curve is oriented from U1 to U2 and has the same orientation as E.
Raised if U1 = U2 or U1 = U2 + 2.0 * Pi
The documentation for this class was generated from the following file:
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