Open CASCADE Technology
6.5.4
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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:
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#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) | |
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, parametrics bounds of the TrimmedCurve, | |
void | Reverse () |
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: | |
Standard_Real | ReversedParameter (const Standard_Real U) const |
Returns the parameter on the reversed curve for the point of parameter U on <me>. returns UFirst + ULast - U | |
void | SetTrim (const Standard_Real U1, const Standard_Real U2, const Standard_Boolean Sense=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, 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. Exceptions Standard_ConstructionError if: | |
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. | |
GeomAbs_Shape | Continuity () const |
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. | |
Standard_Boolean | IsCN (const Standard_Integer N) const |
--- 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. | |
gp_Pnt2d | EndPoint () const |
Returns the end point of <me>. This point is the evaluation of the curve for the "LastParameter". | |
Standard_Real | FirstParameter () const |
Returns the value of the first parameter of <me>. The first parameter is the parameter of the "StartPoint" of the trimmed curve. | |
Standard_Boolean | IsClosed () const |
Returns True if the distance between the StartPoint and the EndPoint is lower or equal to Resolution from package gp. | |
Standard_Boolean | IsPeriodic () const |
Returns true if the basis curve of this trimmed curve is periodic. | |
virtual Standard_Real | Period () const |
Returns the period of the basis curve of this trimmed curve. Exceptions Standard_NoSuchObject if the basis curve is not periodic. | |
Standard_Real | LastParameter () const |
Returns the value of the last parameter of <me>. The last parameter is the parameter of the "EndPoint" of the trimmed curve. | |
gp_Pnt2d | StartPoint () const |
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. | |
void | D0 (const Standard_Real U, gp_Pnt2d &P) const |
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). | |
void | D1 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1) const |
Raised if the continuity of the curve is not C1. | |
void | D2 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1, gp_Vec2d &V2) const |
Raised if the continuity of the curve is not C2. | |
void | D3 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1, gp_Vec2d &V2, gp_Vec2d &V3) const |
Raised if the continuity of the curve is not C3. | |
gp_Vec2d | DN (const Standard_Real U, const Standard_Integer N) const |
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 | |
void | Transform (const gp_Trsf2d &T) |
Applies the transformation T to this trimmed curve. Warning The basis curve is also modified. | |
virtual Standard_Real | TransformedParameter (const Standard_Real U, const gp_Trsf2d &T) const |
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. | |
virtual Standard_Real | ParametricTransformation (const gp_Trsf2d &T) const |
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. | |
Handle_Geom2d_Geometry | Copy () const |
Creates a new object, which is a copy of this trimmed curve. |
Geom2d_TrimmedCurve::Geom2d_TrimmedCurve | ( | const Handle< Geom2d_Curve > & | C, |
const Standard_Real | U1, | ||
const Standard_Real | U2, | ||
const Standard_Boolean | Sense = Standard_True |
||
) |
Handle_Geom2d_Curve Geom2d_TrimmedCurve::BasisCurve | ( | ) | const |
GeomAbs_Shape Geom2d_TrimmedCurve::Continuity | ( | ) | const [virtual] |
Implements Geom2d_Curve.
Handle_Geom2d_Geometry Geom2d_TrimmedCurve::Copy | ( | ) | const [virtual] |
Implements Geom2d_Geometry.
void Geom2d_TrimmedCurve::D0 | ( | const Standard_Real | U, |
gp_Pnt2d & | P | ||
) | const [virtual] |
Implements Geom2d_Curve.
void Geom2d_TrimmedCurve::D1 | ( | const Standard_Real | U, |
gp_Pnt2d & | P, | ||
gp_Vec2d & | V1 | ||
) | const [virtual] |
Implements Geom2d_Curve.
void Geom2d_TrimmedCurve::D2 | ( | const Standard_Real | U, |
gp_Pnt2d & | P, | ||
gp_Vec2d & | V1, | ||
gp_Vec2d & | V2 | ||
) | const [virtual] |
Implements Geom2d_Curve.
void Geom2d_TrimmedCurve::D3 | ( | const Standard_Real | U, |
gp_Pnt2d & | P, | ||
gp_Vec2d & | V1, | ||
gp_Vec2d & | V2, | ||
gp_Vec2d & | V3 | ||
) | const [virtual] |
Implements Geom2d_Curve.
gp_Vec2d Geom2d_TrimmedCurve::DN | ( | const Standard_Real | U, |
const Standard_Integer | N | ||
) | const [virtual] |
Implements Geom2d_Curve.
gp_Pnt2d Geom2d_TrimmedCurve::EndPoint | ( | ) | const [virtual] |
Implements Geom2d_BoundedCurve.
Standard_Real Geom2d_TrimmedCurve::FirstParameter | ( | ) | const [virtual] |
Implements Geom2d_Curve.
Standard_Boolean Geom2d_TrimmedCurve::IsClosed | ( | ) | const [virtual] |
Implements Geom2d_Curve.
Standard_Boolean Geom2d_TrimmedCurve::IsCN | ( | const Standard_Integer | N | ) | const [virtual] |
Implements Geom2d_Curve.
Standard_Boolean Geom2d_TrimmedCurve::IsPeriodic | ( | ) | const [virtual] |
Implements Geom2d_Curve.
Standard_Real Geom2d_TrimmedCurve::LastParameter | ( | ) | const [virtual] |
Implements Geom2d_Curve.
virtual Standard_Real Geom2d_TrimmedCurve::ParametricTransformation | ( | const gp_Trsf2d & | T | ) | const [virtual] |
Reimplemented from Geom2d_Curve.
virtual Standard_Real Geom2d_TrimmedCurve::Period | ( | ) | const [virtual] |
Reimplemented from Geom2d_Curve.
void Geom2d_TrimmedCurve::Reverse | ( | ) | [virtual] |
Implements Geom2d_Curve.
Standard_Real Geom2d_TrimmedCurve::ReversedParameter | ( | const Standard_Real | U | ) | const [virtual] |
Implements Geom2d_Curve.
void Geom2d_TrimmedCurve::SetTrim | ( | const Standard_Real | U1, |
const Standard_Real | U2, | ||
const Standard_Boolean | Sense = Standard_True |
||
) |
gp_Pnt2d Geom2d_TrimmedCurve::StartPoint | ( | ) | const [virtual] |
Implements Geom2d_BoundedCurve.
void Geom2d_TrimmedCurve::Transform | ( | const gp_Trsf2d & | T | ) | [virtual] |
Implements Geom2d_Geometry.
virtual Standard_Real Geom2d_TrimmedCurve::TransformedParameter | ( | const Standard_Real | U, |
const gp_Trsf2d & | T | ||
) | const [virtual] |
Reimplemented from Geom2d_Curve.