Open CASCADE Technology
7.4.0

Defines a portion of a curve limited by two values of parameters inside the parametric domain of the curve. The trimmed curve is defined by: More...
#include <Geom2d_TrimmedCurve.hxx>
Public Member Functions  
Geom2d_TrimmedCurve (const Handle< Geom2d_Curve > &C, const Standard_Real U1, const Standard_Real U2, const Standard_Boolean Sense=Standard_True, const Standard_Boolean theAdjustPeriodic=Standard_True)  
Creates a trimmed curve from the basis curve C limited between U1 and U2. More...  
void  Reverse () override 
Changes the direction of parametrization of <me>. The first and the last parametric values are modified. The "StartPoint" of the initial curve becomes the "EndPoint" of the reversed curve and the "EndPoint" of the initial curve becomes the "StartPoint" of the reversed curve. Example  If the trimmed curve is defined by: 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  SetTrim (const Standard_Real U1, const Standard_Real U2, const Standard_Boolean Sense=Standard_True, const Standard_Boolean theAdjustPeriodic=Standard_True) 
Changes this trimmed curve, by redefining the parameter values U1 and U2, which limit its basis curve. Note: If the basis curve is periodic, the trimmed curve has the same orientation as the basis curve if Sense is true (default value) or the opposite orientation if Sense is false. Warning If the basis curve is periodic and theAdjustPeriodic is True, the bounds of the trimmed curve may be different from U1 and U2 if the parametric origin of the basis curve is within the arc of the trimmed curve. In this case, the modified parameter will be equal to U1 or U2 plus or minus the period. If theAdjustPeriodic is False, parameters U1 and U2 will stay unchanged. Exceptions Standard_ConstructionError if: More...  
Handle< Geom2d_Curve >  BasisCurve () const 
Returns the basis curve. Warning This function does not return a constant reference. Consequently, any modification of the returned value directly modifies the trimmed curve. More...  
GeomAbs_Shape  Continuity () const override 
Returns the global continuity of the basis curve of this trimmed curve. C0 : only geometric continuity, C1 : continuity of the first derivative all along the Curve, C2 : continuity of the second derivative all along the Curve, C3 : continuity of the third derivative all along the Curve, CN : the order of continuity is infinite. More...  
Standard_Boolean  IsCN (const Standard_Integer N) const override 
— Purpose Returns True if the order of continuity of the trimmed curve is N. A trimmed curve is at least "C0" continuous. Warnings : The continuity of the trimmed curve can be greater than the continuity of the basis curve because you consider only a part of the basis curve. Raised if N < 0. More...  
gp_Pnt2d  EndPoint () const override 
Returns the end point of <me>. This point is the evaluation of the curve for the "LastParameter". More...  
Standard_Real  FirstParameter () const override 
Returns the value of the first parameter of <me>. The first parameter is the parameter of the "StartPoint" of the trimmed curve. More...  
Standard_Boolean  IsClosed () const override 
Returns True if the distance between the StartPoint and the EndPoint is lower or equal to Resolution from package gp. More...  
Standard_Boolean  IsPeriodic () const override 
Always returns FALSE (independently of the type of basis curve). More...  
virtual Standard_Real  Period () const override 
Returns the period of the basis curve of this trimmed curve. Exceptions Standard_NoSuchObject if the basis curve is not periodic. More...  
Standard_Real  LastParameter () const override 
Returns the value of the last parameter of <me>. The last parameter is the parameter of the "EndPoint" of the trimmed curve. More...  
gp_Pnt2d  StartPoint () const override 
Returns the start point of <me>. This point is the evaluation of the curve from the "FirstParameter". value and derivatives Warnings : The returned derivatives have the same orientation as the derivatives of the basis curve. More...  
void  D0 (const Standard_Real U, gp_Pnt2d &P) const override 
If the basis curve is an OffsetCurve sometimes it is not possible to do the evaluation of the curve at the parameter U (see class OffsetCurve). More...  
void  D1 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1) const override 
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 
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 
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 the point of parameter U of this trimmed curve, computes the vector corresponding to the Nth derivative. Warning The returned derivative vector has the same orientation as the derivative vector of the basis curve, even if the trimmed curve does not have the same orientation as the basis curve. Exceptions Standard_RangeError if N is less than 1. geometric transformations. More...  
void  Transform (const gp_Trsf2d &T) override 
Applies the transformation T to this trimmed curve. Warning The basis curve is also modified. More...  
virtual Standard_Real  TransformedParameter (const Standard_Real U, const gp_Trsf2d &T) const override 
Returns the parameter on the transformed curve for the transform of the point of parameter U on <me>. More...  
virtual Standard_Real  ParametricTransformation (const gp_Trsf2d &T) const override 
Returns a coefficient to compute the parameter on the transformed curve for the transform of the point on <me>. More...  
Handle< Geom2d_Geometry >  Copy () const override 
Creates a new object, which is a copy of this trimmed curve. More...  
Public Member Functions inherited from Geom2d_Curve  
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...  
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...  
Additional Inherited Members  
Public Types inherited from Standard_Transient  
typedef void  base_type 
Returns a type descriptor about this object. 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...  
Defines a portion of a curve limited by two values of parameters inside the parametric domain of the curve. The trimmed curve is defined by:
Geom2d_TrimmedCurve::Geom2d_TrimmedCurve  (  const Handle< Geom2d_Curve > &  C, 
const Standard_Real  U1,  
const Standard_Real  U2,  
const Standard_Boolean  Sense = Standard_True , 

const Standard_Boolean  theAdjustPeriodic = Standard_True 

) 
Creates a trimmed curve from the basis curve C limited between U1 and U2.
. U1 can be greater or lower than U2. . The returned curve is oriented from U1 to U2. . If the basis curve C is periodic there is an ambiguity because two parts are available. In this case by default the trimmed curve has the same orientation as the basis curve (Sense = True). If Sense = False then the orientation of the trimmed curve is opposite to the orientation of the basis curve C. If the curve is closed but not periodic it is not possible to keep the part of the curve including the junction point (except if the junction point is at the beginning or at the end of the trimmed curve) because you could lose the fundamental characteristics of the basis curve which are used for example to compute the derivatives of the trimmed curve. So for a closed curve the rules are the same as for a open curve. Warnings : In this package the entities are not shared. The TrimmedCurve is built with a copy of the curve C. So when C is modified the TrimmedCurve is not modified Warnings : If is periodic and <theAdjustPeriodic> is True, parametrics bounds of the TrimmedCurve, can be different to [<U1>;<U2>}, if <U1> or <U2> are not in the principal period. Include : For more explanation see the scheme given with this class. Raises ConstructionError the C is not periodic and U1 or U2 are out of the bounds of C. Raised if U1 = U2.
Handle< Geom2d_Curve > Geom2d_TrimmedCurve::BasisCurve  (  )  const 
Returns the basis curve. Warning This function does not return a constant reference. Consequently, any modification of the returned value directly modifies the trimmed curve.

overridevirtual 
Returns the global continuity of the basis curve of this trimmed curve. C0 : only geometric continuity, C1 : continuity of the first derivative all along the Curve, C2 : continuity of the second derivative all along the Curve, C3 : continuity of the third derivative all along the Curve, CN : the order of continuity is infinite.
Implements Geom2d_Curve.

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

overridevirtual 
If the basis curve is an OffsetCurve sometimes it is not possible to do the evaluation of the curve at the parameter U (see class OffsetCurve).
Implements Geom2d_Curve.

overridevirtual 
Raised if the continuity of the curve is not C1.
Implements Geom2d_Curve.

overridevirtual 
Raised if the continuity of the curve is not C2.
Implements Geom2d_Curve.

overridevirtual 
Raised if the continuity of the curve is not C3.
Implements Geom2d_Curve.

overridevirtual 
For the point of parameter U of this trimmed curve, computes the vector corresponding to the Nth derivative. Warning The returned derivative vector has the same orientation as the derivative vector of the basis curve, even if the trimmed curve does not have the same orientation as the basis curve. Exceptions Standard_RangeError if N is less than 1. geometric transformations.
Implements Geom2d_Curve.

overridevirtual 
Returns the end point of <me>. This point is the evaluation of the curve for the "LastParameter".
Implements Geom2d_BoundedCurve.

overridevirtual 
Returns the value of the first parameter of <me>. The first parameter is the parameter of the "StartPoint" of the trimmed curve.
Implements Geom2d_Curve.

overridevirtual 
Returns True if the distance between the StartPoint and the EndPoint is lower or equal to Resolution from package gp.
Implements Geom2d_Curve.

overridevirtual 
— Purpose Returns True if the order of continuity of the trimmed curve is N. A trimmed curve is at least "C0" continuous. Warnings : The continuity of the trimmed curve can be greater than the continuity of the basis curve because you consider only a part of the basis curve. Raised if N < 0.
Implements Geom2d_Curve.

overridevirtual 
Always returns FALSE (independently of the type of basis curve).
Implements Geom2d_Curve.

overridevirtual 
Returns the value of the last parameter of <me>. The last parameter is the parameter of the "EndPoint" of the trimmed curve.
Implements Geom2d_Curve.

overridevirtual 
Returns a coefficient to compute the parameter on the transformed curve for the transform of the point on <me>.
Transformed(T)>Value(U * ParametricTransformation(T))
is the same point as
Value(U).Transformed(T)
This methods calls the basis curve method.
Reimplemented from Geom2d_Curve.

overridevirtual 
Returns the period of the basis curve of this trimmed curve. Exceptions Standard_NoSuchObject if the basis curve is not periodic.
Reimplemented from Geom2d_Curve.

overridevirtual 
Changes the direction of parametrization of <me>. The first and the last parametric values are modified. The "StartPoint" of the initial curve becomes the "EndPoint" of the reversed curve and the "EndPoint" of the initial curve becomes the "StartPoint" of the reversed curve. Example  If the trimmed curve is defined by:
Implements Geom2d_Curve.

overridevirtual 
Returns the parameter on the reversed curve for the point of parameter U on <me>.
returns UFirst + ULast  U
Implements Geom2d_Curve.
void Geom2d_TrimmedCurve::SetTrim  (  const Standard_Real  U1, 
const Standard_Real  U2,  
const Standard_Boolean  Sense = Standard_True , 

const Standard_Boolean  theAdjustPeriodic = Standard_True 

) 
Changes this trimmed curve, by redefining the parameter values U1 and U2, which limit its basis curve. Note: If the basis curve is periodic, the trimmed curve has the same orientation as the basis curve if Sense is true (default value) or the opposite orientation if Sense is false. Warning If the basis curve is periodic and theAdjustPeriodic is True, the bounds of the trimmed curve may be different from U1 and U2 if the parametric origin of the basis curve is within the arc of the trimmed curve. In this case, the modified parameter will be equal to U1 or U2 plus or minus the period. If theAdjustPeriodic is False, parameters U1 and U2 will stay unchanged. Exceptions Standard_ConstructionError if:

overridevirtual 
Returns the start point of <me>. This point is the evaluation of the curve from the "FirstParameter". value and derivatives Warnings : The returned derivatives have the same orientation as the derivatives of the basis curve.
Implements Geom2d_BoundedCurve.

overridevirtual 
Applies the transformation T to this trimmed curve. Warning The basis curve is also modified.
Implements Geom2d_Geometry.

overridevirtual 
Returns the parameter on the transformed curve for the transform of the point of parameter U on <me>.
me>Transformed(T)>Value(me>TransformedParameter(U,T))
is the same point as
me>Value(U).Transformed(T)
This methods calls the basis curve method.
Reimplemented from Geom2d_Curve.