Describes how to construct the following elementary transformations. More...

#include <Geom_Transformation.hxx>

Inheritance diagram for Geom_Transformation:

Public Member Functions
	Geom_Transformation ()
	Creates an identity transformation.

	Geom_Transformation (const gp_Trsf &T)
	Creates a transient copy of T.

void	SetMirror (const gp_Pnt &thePnt)
	Makes the transformation into a symmetrical transformation with respect to a point P. P is the center of the symmetry.

void	SetMirror (const gp_Ax1 &theA1)
	Makes the transformation into a symmetrical transformation with respect to an axis A1. A1 is the center of the axial symmetry.

void	SetMirror (const gp_Ax2 &theA2)
	Makes the transformation into a symmetrical transformation with respect to a plane. The plane of the symmetry is defined with the axis placement A2. It is the plane (Location, XDirection, YDirection).

void	SetRotation (const gp_Ax1 &theA1, const double theAng)
	Makes the transformation into a rotation. A1 is the axis rotation and Ang is the angular value of the rotation in radians.

void	SetScale (const gp_Pnt &thePnt, const double theScale)
	Makes the transformation into a scale. P is the center of the scale and S is the scaling value.

void	SetTransformation (const gp_Ax3 &theFromSystem1, const gp_Ax3 &theToSystem2)
	Makes a transformation allowing passage from the coordinate system "FromSystem1" to the coordinate system "ToSystem2". Example : In a C++ implementation : Real x1, y1, z1; // are the coordinates of a point in the // local system FromSystem1 Real x2, y2, z2; // are the coordinates of a point in the // local system ToSystem2 gp_Pnt P1 (x1, y1, z1) Geom_Transformation T; T.SetTransformation (FromSystem1, ToSystem2); gp_Pnt P2 = P1.Transformed (T); P2.Coord (x2, y2, z2);.

void	SetTransformation (const gp_Ax3 &theToSystem)
	Makes the transformation allowing passage from the basic coordinate system {P(0.,0.,0.), VX (1.,0.,0.), VY (0.,1.,0.), VZ (0., 0. ,1.) } to the local coordinate system defined with the Ax2 ToSystem. Same utilisation as the previous method. FromSystem1 is defaulted to the absolute coordinate system.

void	SetTranslation (const gp_Vec &theVec)
	Makes the transformation into a translation. V is the vector of the translation.

void	SetTranslation (const gp_Pnt &P1, const gp_Pnt &P2)
	Makes the transformation into a translation from the point P1 to the point P2.

void	SetTrsf (const gp_Trsf &theTrsf)
	Converts the gp_Trsf transformation T into this transformation.

bool	IsNegative () const
	Checks whether this transformation is an indirect transformation: returns true if the determinant of the matrix of the vectorial part of the transformation is less than 0.

gp_TrsfForm	Form () const
	Returns the nature of this transformation as a value of the gp_TrsfForm enumeration.

double	ScaleFactor () const
	Returns the scale value of the transformation.

const gp_Trsf &	Trsf () const
	Returns a non transient copy of <me>.

double	Value (const int theRow, const int theCol) const
	Returns the coefficients of the global matrix of transformation. It is a 3 rows X 4 columns matrix.

void	Invert ()
	Raised if the transformation is singular. This means that the ScaleFactor is lower or equal to Resolution from package gp.

occ::handle< Geom_Transformation >	Inverted () const
	Raised if the transformation is singular. This means that the ScaleFactor is lower or equal to Resolution from package gp.

occ::handle< Geom_Transformation >	Multiplied (const occ::handle< Geom_Transformation > &Other) const
	Computes the transformation composed with Other and <me>. <me> * Other. Returns a new transformation.

void	Multiply (const occ::handle< Geom_Transformation > &theOther)
	Computes the transformation composed with Other and <me> . <me> = <me> * Other.

void	Power (const int N)
	Computes the following composition of transformations if N > 0 <me> * <me> * .......* <me>. if N = 0 Identity if N < 0 <me>.Invert() * .........* <me>.Invert()

occ::handle< Geom_Transformation >	Powered (const int N) const
	Raised if N < 0 and if the transformation is not inversible.

void	PreMultiply (const occ::handle< Geom_Transformation > &Other)
	Computes the matrix of the transformation composed with <me> and Other. <me> = Other * <me>

void	Transforms (double &theX, double &theY, double &theZ) const
	Applies the transformation <me> to the triplet {X, Y, Z}.

occ::handle< Geom_Transformation >	Copy () const
	Creates a new object which is a copy of this transformation.

virtual void	DumpJson (Standard_OStream &theOStream, int theDepth=-1) const
	Dumps the content of me into the stream.

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

Describes how to construct the following elementary transformations.

translations,
rotations,
symmetries,
scales. The Transformation class can also be used to construct complex transformations by combining these elementary transformations. However, these transformations can never change the type of an object. For example, the projection transformation can change a circle into an ellipse, and therefore change the real type of the object. Such a transformation is forbidden in this environment and cannot be a Geom_Transformation. The transformation can be represented as follow :

V1 V2 V3 T | a11 a12 a13 a14 | | x | | x'| | a21 a22 a23 a24 | | y | | y'| | a31 a32 a33 a34 | | z | = | z'| | 0 0 0 1 | | 1 | | 1 |

where {V1, V2, V3} defines the vectorial part of the transformation and T defines the translation part of the transformation. Note: Geom_Transformation transformations provide the same kind of "geometric" services as gp_Trsf ones but have more complex data structures. The geometric objects provided by the Geom package use gp_Trsf transformations in the syntaxes Transform and Transformed. Geom_Transformation transformations are used in a context where they can be shared by several objects contained inside a common data structure.

Constructor & Destructor Documentation

◆ Geom_Transformation() [1/2]

Geom_Transformation::Geom_Transformation ( )

Creates an identity transformation.

◆ Geom_Transformation() [2/2]

Geom_Transformation::Geom_Transformation ( const gp_Trsf & T )

Creates a transient copy of T.

Member Function Documentation

◆ Copy()

occ::handle< Geom_Transformation > Geom_Transformation::Copy ( ) const

Creates a new object which is a copy of this transformation.

◆ DumpJson()

virtual void Geom_Transformation::DumpJson	(	Standard_OStream &	theOStream,
		int	theDepth = -1 ) const

virtual

Dumps the content of me into the stream.

◆ Form()

gp_TrsfForm Geom_Transformation::Form ( ) const

inline

Returns the nature of this transformation as a value of the gp_TrsfForm enumeration.

◆ Invert()

void Geom_Transformation::Invert ( )

inline

Raised if the transformation is singular. This means that the ScaleFactor is lower or equal to Resolution from package gp.

◆ Inverted()

occ::handle< Geom_Transformation > Geom_Transformation::Inverted ( ) const

Raised if the transformation is singular. This means that the ScaleFactor is lower or equal to Resolution from package gp.

◆ IsNegative()

bool Geom_Transformation::IsNegative ( ) const

inline

Checks whether this transformation is an indirect transformation: returns true if the determinant of the matrix of the vectorial part of the transformation is less than 0.

◆ Multiplied()

occ::handle< Geom_Transformation > Geom_Transformation::Multiplied ( const occ::handle< Geom_Transformation > & Other ) const

Computes the transformation composed with Other and <me>. <me> * Other. Returns a new transformation.

◆ Multiply()

void Geom_Transformation::Multiply ( const occ::handle< Geom_Transformation > & theOther )

inline

Computes the transformation composed with Other and <me> . <me> = <me> * Other.

◆ Power()

void Geom_Transformation::Power ( const int N )

inline

Computes the following composition of transformations if N > 0 <me> * <me> * .......* <me>. if N = 0 Identity if N < 0 <me>.Invert() * .........* <me>.Invert()

Raised if N < 0 and if the transformation is not inversible

◆ Powered()

occ::handle< Geom_Transformation > Geom_Transformation::Powered ( const int N ) const

Raised if N < 0 and if the transformation is not inversible.

◆ PreMultiply()

void Geom_Transformation::PreMultiply ( const occ::handle< Geom_Transformation > & Other )

Computes the matrix of the transformation composed with <me> and Other. <me> = Other * <me>

◆ ScaleFactor()

double Geom_Transformation::ScaleFactor ( ) const

inline

Returns the scale value of the transformation.

◆ SetMirror() [1/3]

void Geom_Transformation::SetMirror ( const gp_Ax1 & theA1 )

inline

Makes the transformation into a symmetrical transformation with respect to an axis A1. A1 is the center of the axial symmetry.

◆ SetMirror() [2/3]

void Geom_Transformation::SetMirror ( const gp_Ax2 & theA2 )

inline

Makes the transformation into a symmetrical transformation with respect to a plane. The plane of the symmetry is defined with the axis placement A2. It is the plane (Location, XDirection, YDirection).

◆ SetMirror() [3/3]

void Geom_Transformation::SetMirror ( const gp_Pnt & thePnt )

inline

Makes the transformation into a symmetrical transformation with respect to a point P. P is the center of the symmetry.

◆ SetRotation()

void Geom_Transformation::SetRotation	(	const gp_Ax1 &	theA1,
		const double	theAng )

inline

Makes the transformation into a rotation. A1 is the axis rotation and Ang is the angular value of the rotation in radians.

◆ SetScale()

void Geom_Transformation::SetScale	(	const gp_Pnt &	thePnt,
		const double	theScale )

inline

Makes the transformation into a scale. P is the center of the scale and S is the scaling value.

◆ SetTransformation() [1/2]

void Geom_Transformation::SetTransformation	(	const gp_Ax3 &	theFromSystem1,
		const gp_Ax3 &	theToSystem2 )

inline

Makes a transformation allowing passage from the coordinate system "FromSystem1" to the coordinate system "ToSystem2". Example : In a C++ implementation : Real x1, y1, z1; // are the coordinates of a point in the // local system FromSystem1 Real x2, y2, z2; // are the coordinates of a point in the // local system ToSystem2 gp_Pnt P1 (x1, y1, z1) Geom_Transformation T; T.SetTransformation (FromSystem1, ToSystem2); gp_Pnt P2 = P1.Transformed (T); P2.Coord (x2, y2, z2);.

◆ SetTransformation() [2/2]

void Geom_Transformation::SetTransformation ( const gp_Ax3 & theToSystem )

inline

Makes the transformation allowing passage from the basic coordinate system {P(0.,0.,0.), VX (1.,0.,0.), VY (0.,1.,0.), VZ (0., 0. ,1.) } to the local coordinate system defined with the Ax2 ToSystem. Same utilisation as the previous method. FromSystem1 is defaulted to the absolute coordinate system.

◆ SetTranslation() [1/2]

void Geom_Transformation::SetTranslation	(	const gp_Pnt &	P1,
		const gp_Pnt &	P2 )

inline

Makes the transformation into a translation from the point P1 to the point P2.

◆ SetTranslation() [2/2]

void Geom_Transformation::SetTranslation ( const gp_Vec & theVec )

inline

Makes the transformation into a translation. V is the vector of the translation.

◆ SetTrsf()

void Geom_Transformation::SetTrsf ( const gp_Trsf & theTrsf )

inline

Converts the gp_Trsf transformation T into this transformation.

◆ Transforms()

void Geom_Transformation::Transforms	(	double &	theX,
		double &	theY,
		double &	theZ ) const

inline

Applies the transformation <me> to the triplet {X, Y, Z}.

◆ Trsf()

const gp_Trsf & Geom_Transformation::Trsf ( ) const

inline

Returns a non transient copy of <me>.

◆ Value()

double Geom_Transformation::Value	(	const int	theRow,
		const int	theCol ) const

inline

Returns the coefficients of the global matrix of transformation. It is a 3 rows X 4 columns matrix.

Raised if Row < 1 or Row > 3 or Col < 1 or Col > 4

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

Geom_Transformation.hxx

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Geom_Transformation() [1/2]

◆ Geom_Transformation() [2/2]

Member Function Documentation

◆ Copy()

◆ DumpJson()

◆ Form()

◆ Invert()

◆ Inverted()

◆ IsNegative()

◆ Multiplied()

◆ Multiply()

◆ Power()

◆ Powered()

◆ PreMultiply()

◆ ScaleFactor()

◆ SetMirror() [1/3]

◆ SetMirror() [2/3]

◆ SetMirror() [3/3]

◆ SetRotation()

◆ SetScale()

◆ SetTransformation() [1/2]

◆ SetTransformation() [2/2]

◆ SetTranslation() [1/2]

◆ SetTranslation() [2/2]

◆ SetTrsf()

◆ Transforms()

◆ Trsf()

◆ Value()