Open CASCADE Technology
7.4.0

Describes a rational or nonrational Bezier curve. More...
#include <Geom2d_BezierCurve.hxx>
Public Member Functions  
Geom2d_BezierCurve (const TColgp_Array1OfPnt2d &CurvePoles)  
Creates a non rational Bezier curve with a set of poles : CurvePoles. The weights are defaulted to all being 1. Raises ConstructionError if the number of poles is greater than MaxDegree + 1 or lower than 2. More...  
Geom2d_BezierCurve (const TColgp_Array1OfPnt2d &CurvePoles, const TColStd_Array1OfReal &PoleWeights)  
Creates a rational Bezier curve with the set of poles CurvePoles and the set of weights PoleWeights . If all the weights are identical the curve is considered as non rational. Raises ConstructionError if the number of poles is greater than MaxDegree + 1 or lower than 2 or CurvePoles and CurveWeights have not the same length or one weight value is lower or equal to Resolution from package gp. More...  
void  Increase (const Standard_Integer Degree) 
Increases the degree of a bezier curve. Degree is the new degree of <me>. raises ConstructionError if Degree is greater than MaxDegree or lower than 2 or lower than the initial degree of <me>. More...  
void  InsertPoleAfter (const Standard_Integer Index, const gp_Pnt2d &P, const Standard_Real Weight=1.0) 
Inserts a pole with its weight in the set of poles after the pole of range Index. If the curve was non rational it can become rational if all the weights are not identical. Raised if Index is not in the range [0, NbPoles]. More...  
void  InsertPoleBefore (const Standard_Integer Index, const gp_Pnt2d &P, const Standard_Real Weight=1.0) 
Inserts a pole with its weight in the set of poles after the pole of range Index. If the curve was non rational it can become rational if all the weights are not identical. Raised if Index is not in the range [1, NbPoles+1]. More...  
void  RemovePole (const Standard_Integer Index) 
Removes the pole of range Index. If the curve was rational it can become non rational. Raised if Index is not in the range [1, NbPoles]. More...  
void  Reverse () override 
Reverses the direction of parametrization of <me> Value (NewU) = Value (1  OldU) More...  
Standard_Real  ReversedParameter (const Standard_Real U) const override 
Returns the parameter on the reversed curve for the point of parameter U on <me>. More...  
void  Segment (const Standard_Real U1, const Standard_Real U2) 
Segments the curve between U1 and U2 which can be out of the bounds of the curve. The curve is oriented from U1 to U2. The control points are modified, the first and the last point are not the same but the parametrization range is [0, 1] else it could not be a Bezier curve. Warnings : Even if <me> is not closed it can become closed after the segmentation for example if U1 or U2 are out of the bounds of the curve <me> or if the curve makes loop. After the segmentation the length of a curve can be null. More...  
void  SetPole (const Standard_Integer Index, const gp_Pnt2d &P) 
Substitutes the pole of range index with P. If the curve <me> is rational the weight of range Index is not modified. raiseD if Index is not in the range [1, NbPoles]. More...  
void  SetPole (const Standard_Integer Index, const gp_Pnt2d &P, const Standard_Real Weight) 
Substitutes the pole and the weights of range Index. If the curve <me> is not rational it can become rational if all the weights are not identical. If the curve was rational it can become non rational if all the weights are identical. Raised if Index is not in the range [1, NbPoles] Raised if Weight <= Resolution from package gp. More...  
void  SetWeight (const Standard_Integer Index, const Standard_Real Weight) 
Changes the weight of the pole of range Index. If the curve <me> is not rational it can become rational if all the weights are not identical. If the curve was rational it can become non rational if all the weights are identical. Raised if Index is not in the range [1, NbPoles] Raised if Weight <= Resolution from package gp. More...  
Standard_Boolean  IsClosed () const override 
Returns True if the distance between the first point and the last point of the curve is lower or equal to the Resolution from package gp. More...  
Standard_Boolean  IsCN (const Standard_Integer N) const override 
Continuity of the curve, returns True. More...  
Standard_Boolean  IsPeriodic () const override 
Returns False. A BezierCurve cannot be periodic in this package. More...  
Standard_Boolean  IsRational () const 
Returns false if all the weights are identical. The tolerance criterion is Resolution from package gp. More...  
GeomAbs_Shape  Continuity () const override 
Returns GeomAbs_CN, which is the continuity of any Bezier curve. More...  
Standard_Integer  Degree () const 
Returns the polynomial degree of the curve. It is the number of poles less one. In this package the Degree of a Bezier curve cannot be greater than "MaxDegree". More...  
void  D0 (const Standard_Real U, gp_Pnt2d &P) const override 
Returns in P the point of parameter U. If the curve is periodic then the returned point is P(U) with U = Ustart + (U  Uend) where Ustart and Uend are the parametric bounds of the curve. More...  
void  D1 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1) const override 
Returns the point P of parameter U and the first derivative V1. Raised if the continuity of the curve is not C1. More...  
void  D2 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1, gp_Vec2d &V2) const override 
Returns the point P of parameter U, the first and second derivatives V1 and V2. Raised if the continuity of the curve is not C2. More...  
void  D3 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1, gp_Vec2d &V2, gp_Vec2d &V3) const override 
Returns the point P of parameter U, the first, the second and the third derivative. Raised if the continuity of the curve is not C3. More...  
gp_Vec2d  DN (const Standard_Real U, const Standard_Integer N) const override 
For this Bezier curve, computes. More...  
gp_Pnt2d  EndPoint () const override 
Returns the end point or start point of this Bezier curve. More...  
Standard_Real  FirstParameter () const override 
Returns the value of the first parameter of this Bezier curve. This is 0.0, which gives the start point of this Bezier curve. More...  
Standard_Real  LastParameter () const override 
Returns the value of the last parameter of this Bezier curve. This is 1.0, which gives the end point of this Bezier curve. More...  
Standard_Integer  NbPoles () const 
Returns the number of poles for this Bezier curve. More...  
const gp_Pnt2d &  Pole (const Standard_Integer Index) const 
Returns the pole of range Index. Raised if Index is not in the range [1, NbPoles]. More...  
void  Poles (TColgp_Array1OfPnt2d &P) const 
Returns all the poles of the curve. More...  
const TColgp_Array1OfPnt2d &  Poles () const 
Returns all the poles of the curve. More...  
gp_Pnt2d  StartPoint () const override 
Returns Value (U=1), it is the first control point of the curve. More...  
Standard_Real  Weight (const Standard_Integer Index) const 
Returns the weight of range Index. Raised if Index is not in the range [1, NbPoles]. More...  
void  Weights (TColStd_Array1OfReal &W) const 
Returns all the weights of the curve. More...  
const TColStd_Array1OfReal *  Weights () const 
Returns all the weights of the curve. More...  
void  Transform (const gp_Trsf2d &T) override 
Applies the transformation T to this Bezier curve. More...  
void  Resolution (const Standard_Real ToleranceUV, Standard_Real &UTolerance) 
Computes for this Bezier curve the parametric tolerance UTolerance for a given tolerance Tolerance3D (relative to dimensions in the plane). If f(t) is the equation of this Bezier curve, UTolerance ensures that  t1  t0 < Utolerance ===> f(t1)  f(t0) < ToleranceUV. More...  
Handle< Geom2d_Geometry >  Copy () const override 
Creates a new object which is a copy of this Bezier curve. More...  
Public Member Functions inherited from Geom2d_Curve  
virtual Standard_Real  TransformedParameter (const Standard_Real U, const gp_Trsf2d &T) const 
Computes the parameter on the curve transformed by T for the point of parameter U on this curve. Note: this function generally returns U but it can be redefined (for example, on a line). More...  
virtual Standard_Real  ParametricTransformation (const gp_Trsf2d &T) const 
Returns the coefficient required to compute the parametric transformation of this curve when transformation T is applied. This coefficient is the ratio between the parameter of a point on this curve and the parameter of the transformed point on the new curve transformed by T. Note: this function generally returns 1. but it can be redefined (for example, on a line). More...  
Handle< Geom2d_Curve >  Reversed () const 
Creates a reversed duplicate Changes the orientation of this curve. The first and last parameters are not changed, but the parametric direction of the curve is reversed. If the curve is bounded: More...  
virtual Standard_Real  Period () const 
Returns thne period of this curve. raises if the curve is not periodic. More...  
gp_Pnt2d  Value (const Standard_Real U) const 
Computes the point of parameter U on <me>. If the curve is periodic then the returned point is P(U) with U = Ustart + (U  Uend) where Ustart and Uend are the parametric bounds of the curve. More...  
Public Member Functions inherited from Geom2d_Geometry  
void  Mirror (const gp_Pnt2d &P) 
Performs the symmetrical transformation of a Geometry with respect to the point P which is the center of the symmetry and assigns the result to this geometric object. More...  
void  Mirror (const gp_Ax2d &A) 
Performs the symmetrical transformation of a Geometry with respect to an axis placement which is the axis of the symmetry. More...  
void  Rotate (const gp_Pnt2d &P, const Standard_Real Ang) 
Rotates a Geometry. P is the center of the rotation. Ang is the angular value of the rotation in radians. More...  
void  Scale (const gp_Pnt2d &P, const Standard_Real S) 
Scales a Geometry. S is the scaling value. More...  
void  Translate (const gp_Vec2d &V) 
Translates a Geometry. V is the vector of the tanslation. More...  
void  Translate (const gp_Pnt2d &P1, const gp_Pnt2d &P2) 
Translates a Geometry from the point P1 to the point P2. More...  
Handle< Geom2d_Geometry >  Mirrored (const gp_Pnt2d &P) const 
Handle< Geom2d_Geometry >  Mirrored (const gp_Ax2d &A) const 
Handle< Geom2d_Geometry >  Rotated (const gp_Pnt2d &P, const Standard_Real Ang) const 
Handle< Geom2d_Geometry >  Scaled (const gp_Pnt2d &P, const Standard_Real S) const 
Handle< Geom2d_Geometry >  Transformed (const gp_Trsf2d &T) const 
Handle< Geom2d_Geometry >  Translated (const gp_Vec2d &V) const 
Handle< Geom2d_Geometry >  Translated (const gp_Pnt2d &P1, const gp_Pnt2d &P2) const 
Public Member Functions inherited from Standard_Transient  
Standard_Transient ()  
Empty constructor. More...  
Standard_Transient (const Standard_Transient &)  
Copy constructor – does nothing. More...  
Standard_Transient &  operator= (const Standard_Transient &) 
Assignment operator, needed to avoid copying reference counter. More...  
virtual  ~Standard_Transient () 
Destructor must be virtual. More...  
virtual void  Delete () const 
Memory deallocator for transient classes. More...  
virtual const opencascade::handle< Standard_Type > &  DynamicType () const 
Returns a type descriptor about this object. More...  
Standard_Boolean  IsInstance (const opencascade::handle< Standard_Type > &theType) const 
Returns a true value if this is an instance of Type. More...  
Standard_Boolean  IsInstance (const Standard_CString theTypeName) const 
Returns a true value if this is an instance of TypeName. More...  
Standard_Boolean  IsKind (const opencascade::handle< Standard_Type > &theType) const 
Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...  
Standard_Boolean  IsKind (const Standard_CString theTypeName) const 
Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...  
Standard_Transient *  This () const 
Returns nonconst pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...  
Standard_Integer  GetRefCount () const 
Get the reference counter of this object. More...  
void  IncrementRefCounter () const 
Increments the reference counter of this object. More...  
Standard_Integer  DecrementRefCounter () const 
Decrements the reference counter of this object; returns the decremented value. More...  
Static Public Member Functions  
static Standard_Integer  MaxDegree () 
Returns the value of the maximum polynomial degree of a BezierCurve. This value is 25. More...  
Static Public Member Functions inherited from Standard_Transient  
static const char *  get_type_name () 
Returns a type descriptor about this object. More...  
static const opencascade::handle< Standard_Type > &  get_type_descriptor () 
Returns type descriptor of Standard_Transient class. More...  
Additional Inherited Members  
Public Types inherited from Standard_Transient  
typedef void  base_type 
Returns a type descriptor about this object. More...  
Describes a rational or nonrational Bezier curve.
Geom2d_BezierCurve::Geom2d_BezierCurve  (  const TColgp_Array1OfPnt2d &  CurvePoles  ) 
Creates a non rational Bezier curve with a set of poles : CurvePoles. The weights are defaulted to all being 1. Raises ConstructionError if the number of poles is greater than MaxDegree + 1 or lower than 2.
Geom2d_BezierCurve::Geom2d_BezierCurve  (  const TColgp_Array1OfPnt2d &  CurvePoles, 
const TColStd_Array1OfReal &  PoleWeights  
) 
Creates a rational Bezier curve with the set of poles CurvePoles and the set of weights PoleWeights . If all the weights are identical the curve is considered as non rational. Raises ConstructionError if the number of poles is greater than MaxDegree + 1 or lower than 2 or CurvePoles and CurveWeights have not the same length or one weight value is lower or equal to Resolution from package gp.

overridevirtual 
Returns GeomAbs_CN, which is the continuity of any Bezier curve.
Implements Geom2d_Curve.

overridevirtual 
Creates a new object which is a copy of this Bezier curve.
Implements Geom2d_Geometry.

overridevirtual 
Returns in P the point of parameter U. If the curve is periodic then the returned point is P(U) with U = Ustart + (U  Uend) where Ustart and Uend are the parametric bounds of the curve.
Raised only for the "OffsetCurve" if it is not possible to compute the current point. For example when the first derivative on the basis curve and the offset direction are parallel.
Implements Geom2d_Curve.

overridevirtual 
Returns the point P of parameter U and the first derivative V1. Raised if the continuity of the curve is not C1.
Implements Geom2d_Curve.

overridevirtual 
Returns the point P of parameter U, the first and second derivatives V1 and V2. Raised if the continuity of the curve is not C2.
Implements Geom2d_Curve.

overridevirtual 
Returns the point P of parameter U, the first, the second and the third derivative. Raised if the continuity of the curve is not C3.
Implements Geom2d_Curve.
Standard_Integer Geom2d_BezierCurve::Degree  (  )  const 
Returns the polynomial degree of the curve. It is the number of poles less one. In this package the Degree of a Bezier curve cannot be greater than "MaxDegree".

overridevirtual 
For this Bezier curve, computes.
Implements Geom2d_Curve.

overridevirtual 
Returns the end point or start point of this Bezier curve.
Implements Geom2d_BoundedCurve.

overridevirtual 
Returns the value of the first parameter of this Bezier curve. This is 0.0, which gives the start point of this Bezier curve.
Implements Geom2d_Curve.
void Geom2d_BezierCurve::Increase  (  const Standard_Integer  Degree  ) 
Increases the degree of a bezier curve. Degree is the new degree of <me>. raises ConstructionError if Degree is greater than MaxDegree or lower than 2 or lower than the initial degree of <me>.
void Geom2d_BezierCurve::InsertPoleAfter  (  const Standard_Integer  Index, 
const gp_Pnt2d &  P,  
const Standard_Real  Weight = 1.0 

) 
Inserts a pole with its weight in the set of poles after the pole of range Index. If the curve was non rational it can become rational if all the weights are not identical. Raised if Index is not in the range [0, NbPoles].
Raised if the resulting number of poles is greater than MaxDegree + 1.
void Geom2d_BezierCurve::InsertPoleBefore  (  const Standard_Integer  Index, 
const gp_Pnt2d &  P,  
const Standard_Real  Weight = 1.0 

) 
Inserts a pole with its weight in the set of poles after the pole of range Index. If the curve was non rational it can become rational if all the weights are not identical. Raised if Index is not in the range [1, NbPoles+1].
Raised if the resulting number of poles is greater than MaxDegree + 1.

overridevirtual 
Returns True if the distance between the first point and the last point of the curve is lower or equal to the Resolution from package gp.
Implements Geom2d_Curve.

overridevirtual 
Continuity of the curve, returns True.
Implements Geom2d_Curve.

overridevirtual 
Returns False. A BezierCurve cannot be periodic in this package.
Implements Geom2d_Curve.
Standard_Boolean Geom2d_BezierCurve::IsRational  (  )  const 
Returns false if all the weights are identical. The tolerance criterion is Resolution from package gp.

overridevirtual 
Returns the value of the last parameter of this Bezier curve. This is 1.0, which gives the end point of this Bezier curve.
Implements Geom2d_Curve.

static 
Returns the value of the maximum polynomial degree of a BezierCurve. This value is 25.
Standard_Integer Geom2d_BezierCurve::NbPoles  (  )  const 
Returns the number of poles for this Bezier curve.
const gp_Pnt2d& Geom2d_BezierCurve::Pole  (  const Standard_Integer  Index  )  const 
Returns the pole of range Index. Raised if Index is not in the range [1, NbPoles].
void Geom2d_BezierCurve::Poles  (  TColgp_Array1OfPnt2d &  P  )  const 
Returns all the poles of the curve.
Raised if the length of P is not equal to the number of poles.

inline 
Returns all the poles of the curve.
void Geom2d_BezierCurve::RemovePole  (  const Standard_Integer  Index  ) 
Removes the pole of range Index. If the curve was rational it can become non rational. Raised if Index is not in the range [1, NbPoles].
void Geom2d_BezierCurve::Resolution  (  const Standard_Real  ToleranceUV, 
Standard_Real &  UTolerance  
) 
Computes for this Bezier curve the parametric tolerance UTolerance for a given tolerance Tolerance3D (relative to dimensions in the plane). If f(t) is the equation of this Bezier curve, UTolerance ensures that  t1  t0 < Utolerance ===> f(t1)  f(t0) < ToleranceUV.

overridevirtual 
Reverses the direction of parametrization of <me> Value (NewU) = Value (1  OldU)
Implements Geom2d_Curve.

overridevirtual 
Returns the parameter on the reversed curve for the point of parameter U on <me>.
returns 1U
Implements Geom2d_Curve.
void Geom2d_BezierCurve::Segment  (  const Standard_Real  U1, 
const Standard_Real  U2  
) 
Segments the curve between U1 and U2 which can be out of the bounds of the curve. The curve is oriented from U1 to U2. The control points are modified, the first and the last point are not the same but the parametrization range is [0, 1] else it could not be a Bezier curve. Warnings : Even if <me> is not closed it can become closed after the segmentation for example if U1 or U2 are out of the bounds of the curve <me> or if the curve makes loop. After the segmentation the length of a curve can be null.
void Geom2d_BezierCurve::SetPole  (  const Standard_Integer  Index, 
const gp_Pnt2d &  P  
) 
Substitutes the pole of range index with P. If the curve <me> is rational the weight of range Index is not modified. raiseD if Index is not in the range [1, NbPoles].
void Geom2d_BezierCurve::SetPole  (  const Standard_Integer  Index, 
const gp_Pnt2d &  P,  
const Standard_Real  Weight  
) 
Substitutes the pole and the weights of range Index. If the curve <me> is not rational it can become rational if all the weights are not identical. If the curve was rational it can become non rational if all the weights are identical. Raised if Index is not in the range [1, NbPoles] Raised if Weight <= Resolution from package gp.
void Geom2d_BezierCurve::SetWeight  (  const Standard_Integer  Index, 
const Standard_Real  Weight  
) 
Changes the weight of the pole of range Index. If the curve <me> is not rational it can become rational if all the weights are not identical. If the curve was rational it can become non rational if all the weights are identical. Raised if Index is not in the range [1, NbPoles] Raised if Weight <= Resolution from package gp.

overridevirtual 
Returns Value (U=1), it is the first control point of the curve.
Implements Geom2d_BoundedCurve.

overridevirtual 
Applies the transformation T to this Bezier curve.
Implements Geom2d_Geometry.
Standard_Real Geom2d_BezierCurve::Weight  (  const Standard_Integer  Index  )  const 
Returns the weight of range Index. Raised if Index is not in the range [1, NbPoles].
void Geom2d_BezierCurve::Weights  (  TColStd_Array1OfReal &  W  )  const 
Returns all the weights of the curve.
Raised if the length of W is not equal to the number of poles.

inline 
Returns all the weights of the curve.