BRepOffset_SimpleOffset Class Reference

This class represents mechanism of simple offset algorithm i.e. topology-preserve offset construction without intersection. More...

#include <BRepOffset_SimpleOffset.hxx>

Inheritance diagram for BRepOffset_SimpleOffset:

Public Member Functions
	BRepOffset_SimpleOffset (const TopoDS_Shape &theInputShape, const double theOffsetValue, const double theTolerance)
	Constructor.
bool	NewSurface (const TopoDS_Face &F, occ::handle< Geom_Surface > &S, TopLoc_Location &L, double &Tol, bool &RevWires, bool &RevFace) override
	Returns true if the face <F> has been modified. In this case, is the new geometric support of the face, <L> the new location, <Tol> the new tolerance. <RevWires> has to be set to true when the modification reverses the normal of the surface. (the wires have to be reversed). <RevFace> has to be set to true if the orientation of the modified face changes in the shells which contain it. Here, <RevFace> will return true if the gp_Trsf is negative.
bool	NewCurve (const TopoDS_Edge &E, occ::handle< Geom_Curve > &C, TopLoc_Location &L, double &Tol) override
	Returns true if the edge <E> has been modified. In this case, is the new geometric support of the edge, <L> the new location, <Tol> the new tolerance. Otherwise, returns false, and , <L>, <Tol> are not significant.
bool	NewPoint (const TopoDS_Vertex &V, gp_Pnt &P, double &Tol) override
	Returns true if the vertex <V> has been modified. In this case,.
bool	NewCurve2d (const TopoDS_Edge &E, const TopoDS_Face &F, const TopoDS_Edge &NewE, const TopoDS_Face &NewF, occ::handle< Geom2d_Curve > &C, double &Tol) override
	Returns true if the edge <E> has a new curve on surface on the face <F>. In this case, is the new geometric support of the edge, <L> the new location, <Tol> the new tolerance. Otherwise, returns false, and , <L>, <Tol> are not significant.
bool	NewParameter (const TopoDS_Vertex &V, const TopoDS_Edge &E, double &P, double &Tol) override
	Returns true if the Vertex <V> has a new parameter on the edge <E>. In this case,.
GeomAbs_Shape	Continuity (const TopoDS_Edge &E, const TopoDS_Face &F1, const TopoDS_Face &F2, const TopoDS_Edge &NewE, const TopoDS_Face &NewF1, const TopoDS_Face &NewF2) override
	Returns the continuity of <NewE> between <NewF1> and <NewF2>.
Public Member Functions inherited from BRepTools_Modification
virtual bool	NewTriangulation (const TopoDS_Face &F, occ::handle< Poly_Triangulation > &T)
	Returns true if the face has been modified according to changed triangulation. If the face has been modified:
virtual bool	NewPolygon (const TopoDS_Edge &E, occ::handle< Poly_Polygon3D > &P)
	Returns true if the edge has been modified according to changed polygon. If the edge has been modified:
virtual bool	NewPolygonOnTriangulation (const TopoDS_Edge &E, const TopoDS_Face &F, occ::handle< Poly_PolygonOnTriangulation > &P)
	Returns true if the edge has been modified according to changed polygon on triangulation. If the edge has been modified:
Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor.
	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing.
Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter.
virtual	~Standard_Transient ()=default
	Destructor must be virtual.
virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.
bool	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.
bool	IsInstance (const char *const theTypeName) const
	Returns a true value if this is an instance of TypeName.
bool	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.
bool	IsKind (const char *const 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.
Standard_Transient *	This () const
	Returns non-const 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.
int	GetRefCount () const noexcept
	Get the reference counter of this object.
void	IncrementRefCounter () noexcept
	Increments the reference counter of this object. Uses relaxed memory ordering since incrementing only requires atomicity, not synchronization with other memory operations.
int	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value. Uses release ordering for the decrement to ensure all writes to the object are visible before the count reaches zero. An acquire fence is added only when the count reaches zero, ensuring proper synchronization before deletion. This is more efficient than using acq_rel for every decrement.
virtual void	Delete () const
	Memory deallocator for transient classes.

Additional Inherited Members
Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object.
Static Public Member Functions inherited from Standard_Transient
static constexpr const char *	get_type_name ()
	Returns a type descriptor about this object.
static const opencascade::handle< Standard_Type > &	get_type_descriptor ()
	Returns type descriptor of Standard_Transient class.

Detailed Description

This class represents mechanism of simple offset algorithm i.e. topology-preserve offset construction without intersection.

The list below shows mapping scheme:

• Each surface is mapped to its geometric offset surface.
• For each edge, pcurves are mapped to the same pcurves on offset surfaces.
• For each edge, 3d curve is constructed by re-approximation of pcurve on the first offset face.
• Position of each vertex in a result shell is computed as average point of all ends of edges shared by that vertex.
• Tolerances are updated according to the resulting geometry.

Constructor & Destructor Documentation

BRepOffset_SimpleOffset()

BRepOffset_SimpleOffset::BRepOffset_SimpleOffset	(	const TopoDS_Shape &	theInputShape,
		const double	theOffsetValue,
		const double	theTolerance )

Constructor.

Parameters

theInputShape	shape to be offset
theOffsetValue	offset distance (signed)
theTolerance	tolerance for handling singular points

Member Function Documentation

Continuity()

GeomAbs_Shape BRepOffset_SimpleOffset::Continuity ( const TopoDS_Edge & E, const TopoDS_Face & F1, const TopoDS_Face & F2, const TopoDS_Edge & NewE, const TopoDS_Face & NewF1, const TopoDS_Face & NewF2 )

overridevirtual

Returns the continuity of <NewE> between <NewF1> and <NewF2>.

<NewE> is the new edge created from <E>. <NewF1> (resp. <NewF2>) is the new face created from <F1> (resp. <F2>).

Implements BRepTools_Modification.

NewCurve()

bool BRepOffset_SimpleOffset::NewCurve ( const TopoDS_Edge & E, occ::handle< Geom_Curve > & C, TopLoc_Location & L, double & Tol )

overridevirtual

Returns true if the edge <E> has been modified. In this case, is the new geometric support of the edge, <L> the new location, <Tol> the new tolerance. Otherwise, returns false, and , <L>, <Tol> are not significant.

Implements BRepTools_Modification.

NewCurve2d()

bool BRepOffset_SimpleOffset::NewCurve2d ( const TopoDS_Edge & E, const TopoDS_Face & F, const TopoDS_Edge & NewE, const TopoDS_Face & NewF, occ::handle< Geom2d_Curve > & C, double & Tol )

overridevirtual

Returns true if the edge <E> has a new curve on surface on the face <F>. In this case, is the new geometric support of the edge, <L> the new location, <Tol> the new tolerance. Otherwise, returns false, and , <L>, <Tol> are not significant.

Implements BRepTools_Modification.

NewParameter()

bool BRepOffset_SimpleOffset::NewParameter ( const TopoDS_Vertex & V, const TopoDS_Edge & E, double & P, double & Tol )

overridevirtual

Returns true if the Vertex <V> has a new parameter on the edge <E>. In this case,.

is the parameter, <Tol> the new tolerance. Otherwise, returns false, and

, <Tol> are not significant.

Implements BRepTools_Modification.

NewPoint()

bool BRepOffset_SimpleOffset::NewPoint ( const TopoDS_Vertex & V, gp_Pnt & P, double & Tol )

overridevirtual

Returns true if the vertex <V> has been modified. In this case,.

is the new geometric support of the vertex, <Tol> the new tolerance. Otherwise, returns false, and

, <Tol> are not significant.

Implements BRepTools_Modification.

NewSurface()

bool BRepOffset_SimpleOffset::NewSurface ( const TopoDS_Face & F, occ::handle< Geom_Surface > & S, TopLoc_Location & L, double & Tol, bool & RevWires, bool & RevFace )

overridevirtual

Returns true if the face <F> has been modified. In this case, is the new geometric support of the face, <L> the new location, <Tol> the new tolerance. <RevWires> has to be set to true when the modification reverses the normal of the surface. (the wires have to be reversed). <RevFace> has to be set to true if the orientation of the modified face changes in the shells which contain it. Here, <RevFace> will return true if the gp_Trsf is negative.

Implements BRepTools_Modification.

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

• BRepOffset_SimpleOffset.hxx