#include <Geom2d_TrimmedCurve.hxx>
Inheritance diagram for Geom2d_TrimmedCurve:
Public Member Functions | |
Standard_EXPORT | 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 <c> is periodic, 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. . | |
Standard_EXPORT 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: - a basis curve whose parameter range is [ 0.,1. ], and - the two trim values U1 (first parameter) and U2 (last parameter), the reversed trimmed curve is defined by: - the reversed basis curve, whose parameter range is still [ 0.,1. ], and - the two trim values 1. - U2 (first parameter) and 1. - U1 (last parameter). . | |
Standard_EXPORT 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 . | |
Standard_EXPORT 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: - the basis curve is not periodic, and either U1 or U2 are outside the bounds of the basis curve, or - U1 is equal to U2. . | |
Standard_EXPORT 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. . | |
Standard_EXPORT 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_EXPORT 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. | |
Standard_EXPORT gp_Pnt2d | EndPoint () const |
Returns the end point of <me>. This point is the evaluation of the curve for the "LastParameter". . | |
Standard_EXPORT 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_EXPORT 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_EXPORT Standard_Boolean | IsPeriodic () const |
Returns true if the basis curve of this trimmed curve is periodic. . | |
virtual Standard_EXPORT 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_EXPORT 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. . | |
Standard_EXPORT 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. . | |
Standard_EXPORT 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). . | |
Standard_EXPORT void | D1 (const Standard_Real U, gp_Pnt2d &P, gp_Vec2d &V1) const |
Raised if the continuity of the curve is not C1. . | |
Standard_EXPORT 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. . | |
Standard_EXPORT 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. . | |
Standard_EXPORT 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 . | |
Standard_EXPORT void | Transform (const gp_Trsf2d &T) |
Applies the transformation T to this trimmed curve. Warning The basis curve is also modified. . | |
virtual Standard_EXPORT 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_EXPORT 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. . | |
Standard_EXPORT Handle_Geom2d_Geometry | Copy () const |
Creates a new object, which is a copy of this trimmed curve. . | |
Standard_EXPORT const | Handle (Standard_Type)&DynamicType() const |
Private Attributes | |
Handle_Geom2d_Curve | basisCurve |
Standard_Real | uTrim1 |
Standard_Real | uTrim2 |
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Implements Geom2d_Curve. |
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Implements Geom2d_Geometry. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_BoundedCurve. |
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Implements Geom2d_Curve. |
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Reimplemented from Geom2d_BoundedCurve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Reimplemented from Geom2d_Curve. |
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Reimplemented from Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_Curve. |
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Implements Geom2d_BoundedCurve. |
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Implements Geom2d_Geometry. |
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Reimplemented from Geom2d_Curve. |
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