# FoundationClasses
TKMath
Convert

# Convert_CompBezierCurves2dToBSplineCurve2d Class Reference

Converts a list of connecting Bezier Curves 2d to a
BSplineCurve 2d.
if possible, the continuity of the BSpline will be
increased to more than C0.
.

`#include <Convert_CompBezierCurves2dToBSplineCurve2d.hxx>`

## Public Member Functions

void * | operator new (size_t, void *anAddress)
void * | operator new (size_t size)
void | operator delete (void *anAddress)
Standard_EXPORT | Convert_CompBezierCurves2dToBSplineCurve2d (const Standard_Real AngularTolerance=1.0e-4)

Constructs a framework for converting a sequence of
adjacent non-rational Bezier curves into a BSpline curve.
Knots will be created on the computed BSpline curve at
each junction point of two consecutive Bezier curves. The
degree of continuity of the BSpline curve will be increased at
the junction point of two consecutive Bezier curves if their
tangent vectors at this point are parallel. AngularTolerance
(given in radians, and defaulted to 1.0 e-4) will be used
to check the parallelism of the two tangent vectors.
Use the following functions:
- AddCurve to define in sequence the adjacent Bezier
curves to be converted,
- Perform to compute the data needed to build the BSpline curve,
- and the available consultation functions to access the
computed data. This data may be used to construct the BSpline curve.
.

Standard_EXPORT void | AddCurve (const TColgp_Array1OfPnt2d &Poles)

Adds the Bezier curve defined by the table of poles Poles, to
the sequence (still contained in this framework) of adjacent
Bezier curves to be converted into a BSpline curve.
Only polynomial (i.e. non-rational) Bezier curves are
converted using this framework.
If this is not the first call to the function (i.e. if this framework
still contains data in its sequence of Bezier curves), the
degree of continuity of the BSpline curve will be increased at
the time of computation at the first point of the added Bezier
curve (i.e. the first point of the Poles table). This will be the
case if the tangent vector of the curve at this point is
parallel to the tangent vector at the end point of the
preceding Bezier curve in the sequence of Bezier curves still
contained in this framework. An angular tolerance given at
the time of construction of this framework, will be used to
check the parallelism of the two tangent vectors. This
checking procedure, and all the relative computations will be
performed by the function Perform.
When the sequence of adjacent Bezier curves is complete,
use the following functions:
- Perform to compute the data needed to build the BSpline curve,
- and the available consultation functions to access the
computed data. This data may be used to construct the BSpline curve.
Warning
The sequence of Bezier curves treated by this framework is
automatically initialized with the first Bezier curve when the
function is first called. During subsequent use of this function,
ensure that the first point of the added Bezier curve (i.e. the
first point of the Poles table) is coincident with the last point
of the sequence (i.e. the last point of the preceding Bezier
curve in the sequence) of Bezier curves still contained in
this framework. An error may occur at the time of
computation if this condition is not satisfied. Particular care
must be taken with respect to the above, as this condition is
not checked either when defining the sequence of Bezier
curves or at the time of computation.
.

Standard_EXPORT void | Perform ()

Computes all the data needed to build a BSpline curve
equivalent to the sequence of adjacent Bezier curves still
contained in this framework.
A knot is inserted on the computed BSpline curve at the
junction point of two consecutive Bezier curves. The
degree of continuity of the BSpline curve will be increased
at the junction point of two consecutive Bezier curves if
their tangent vectors at this point are parallel. An angular
tolerance given at the time of construction of this
framework is used to check the parallelism of the two
tangent vectors.
Use the available consultation functions to access the
computed data. This data may then be used to construct
the BSpline curve.
Warning
Ensure that the curves in the sequence of Bezier curves
contained in this framework are adjacent. An error may
occur at the time of computation if this condition is not
satisfied. Particular care must be taken with respect to the
above as this condition is not checked, either when
defining the Bezier curve sequence or at the time of computation.
.

Standard_EXPORT Standard_Integer | Degree () const
| Returns the degree of the BSpline curve whose data is computed in this framework. Warning Take particular care not to use this function before the computation is performed (Perform function), as this condition is not checked and an error may therefore occur. .
Standard_EXPORT Standard_Integer | NbPoles () const
| Returns the number of poles of the BSpline curve whose data is computed in this framework. Warning Take particular care not to use this function before the computation is performed (Perform function), as this condition is not checked and an error may therefore occur. .
Standard_EXPORT void | Poles (TColgp_Array1OfPnt2d &Poles) const

Loads the Poles table with the poles of the BSpline curve
whose data is computed in this framework.
Warning
- Do not use this function before the computation is
performed (Perform function).
- The length of the Poles array must be equal to the
number of poles of the BSpline curve whose data is
computed in this framework.
Particular care must be taken with respect to the above, as
these conditions are not checked, and an error may occur.
.

Standard_EXPORT Standard_Integer | NbKnots () const
| Returns the number of knots of the BSpline curve whose data is computed in this framework. Warning Take particular care not to use this function before the computation is performed (Perform function), as this condition is not checked and an error may therefore occur. .
Standard_EXPORT void | KnotsAndMults (TColStd_Array1OfReal &Knots, TColStd_Array1OfInteger &Mults) const

Loads the Knots table with the knots
and the Mults table with the corresponding multiplicities
of the BSpline curve whose data is computed in this framework.
Warning
- Do not use this function before the computation is
performed (Perform function).
- The length of the Knots and Mults arrays must be equal
to the number of knots in the BSpline curve whose data is
computed in this framework.
Particular care must be taken with respect to the above as
these conditions are not checked, and an error may occur.
.

## Private Attributes

Convert_SequenceOfArray1OfPoles2d | mySequence
TColgp_SequenceOfPnt2d | CurvePoles
TColStd_SequenceOfReal | CurveKnots
TColStd_SequenceOfInteger | KnotsMultiplicities
Standard_Integer | myDegree
Standard_Real | myAngular
Standard_Boolean | myDone

## Constructor & Destructor Documentation

Standard_EXPORT Convert_CompBezierCurves2dToBSplineCurve2d::Convert_CompBezierCurves2dToBSplineCurve2d | ( | const Standard_Real | AngularTolerance = `1.0e-4` | ) |

## Member Function Documentation

Standard_EXPORT void Convert_CompBezierCurves2dToBSplineCurve2d::AddCurve | ( | const TColgp_Array1OfPnt2d & | Poles | ) |

Standard_EXPORT Standard_Integer Convert_CompBezierCurves2dToBSplineCurve2d::Degree | ( |  | ) | const

Standard_EXPORT void Convert_CompBezierCurves2dToBSplineCurve2d::KnotsAndMults | ( | TColStd_Array1OfReal & | Knots,
|  | TColStd_Array1OfInteger & | Mults
| ) | const

Standard_EXPORT Standard_Integer Convert_CompBezierCurves2dToBSplineCurve2d::NbKnots | ( |  | ) | const

Standard_EXPORT Standard_Integer Convert_CompBezierCurves2dToBSplineCurve2d::NbPoles | ( |  | ) | const

void Convert_CompBezierCurves2dToBSplineCurve2d::operator delete | ( | void * | anAddress | ) | `[inline]`

void* Convert_CompBezierCurves2dToBSplineCurve2d::operator new | ( | size_t | size | ) | `[inline]`

void* Convert_CompBezierCurves2dToBSplineCurve2d::operator new | ( | size_t | ,
|  | void * | anAddress
| ) | `[inline]`

Standard_EXPORT void Convert_CompBezierCurves2dToBSplineCurve2d::Perform | ( |  | ) |

Standard_EXPORT void Convert_CompBezierCurves2dToBSplineCurve2d::Poles | ( | TColgp_Array1OfPnt2d & | Poles | ) | const

## Field Documentation

TColStd_SequenceOfReal Convert_CompBezierCurves2dToBSplineCurve2d::CurveKnots `[private]`

TColgp_SequenceOfPnt2d Convert_CompBezierCurves2dToBSplineCurve2d::CurvePoles `[private]`

TColStd_SequenceOfInteger Convert_CompBezierCurves2dToBSplineCurve2d::KnotsMultiplicities `[private]`

Standard_Real Convert_CompBezierCurves2dToBSplineCurve2d::myAngular `[private]`

Standard_Integer Convert_CompBezierCurves2dToBSplineCurve2d::myDegree `[private]`

Standard_Boolean Convert_CompBezierCurves2dToBSplineCurve2d::myDone `[private]`

Convert_SequenceOfArray1OfPoles2d Convert_CompBezierCurves2dToBSplineCurve2d::mySequence `[private]`

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

- Convert_CompBezierCurves2dToBSplineCurve2d.hxx