Geom_Axis2Placement Class Reference

Describes a right-handed coordinate system in 3D space.
A coordinate system is defined by:
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#include <Geom_Axis2Placement.hxx>

Inheritance diagram for Geom_Axis2Placement:

Public Member Functions
	Geom_Axis2Placement (const gp_Ax2 &A2)
	Returns a transient copy of A2.
	Geom_Axis2Placement (const gp_Pnt &P, const gp_Dir &N, const gp_Dir &Vx)
	P is the origin of the axis placement, N is the main direction of the axis placement and Vx is the "XDirection". If the two directions N and Vx are not orthogonal the "XDirection" is computed as follow : XDirection = N ^ (Vx ^ N). //! Raised if N and Vx are parallel.
void	SetAx2 (const gp_Ax2 &A2)
	Assigns the origin and the three unit vectors of A2 to this coordinate system.
void	SetDirection (const gp_Dir &V)
	Changes the main direction of the axis placement. The "Xdirection" is modified : New XDirection = V ^ (Previous_Xdirection ^ V). Raised if V and the previous "XDirection" are parallel because it is impossible to calculate the new "XDirection" and the new "YDirection".
void	SetXDirection (const gp_Dir &Vx)
	Changes the "XDirection" of the axis placement, Vx is the new "XDirection". If Vx is not normal to the main direction then "XDirection" is computed as follow : XDirection = Direction ^ ( Vx ^ Direction). The main direction is not modified. //! Raised if Vx and "Direction" are parallel.
void	SetYDirection (const gp_Dir &Vy)
	Changes the "YDirection" of the axis placement, Vy is the new "YDirection". If Vy is not normal to the main direction then "YDirection" is computed as follow : YDirection = Direction ^ ( Vy ^ Direction). The main direction is not modified. The "XDirection" is modified. //! Raised if Vy and the main direction are parallel.
gp_Ax2	Ax2 () const
	Returns a non transient copy of <me>.
const gp_Dir &	XDirection () const
	Returns the "XDirection". This is a unit vector.
const gp_Dir &	YDirection () const
	Returns the "YDirection". This is a unit vector.
void	Transform (const gp_Trsf &T)
	Transforms an axis placement with a Trsf. The "Location" point, the "XDirection" and the "YDirection" are transformed with T. The resulting main "Direction" of <me> is the cross product between the "XDirection" and the "YDirection" after transformation.
Handle_Geom_Geometry	Copy () const
	Creates a new object which is a copy of this coordinate system.

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Detailed Description

• its origin, also termed the "Location point" of the coordinate system,
  
• three orthogonal unit vectors, termed respectively
  the "X Direction", "Y Direction" and "Direction" (or
  "main Direction") of the coordinate system.
  As a Geom_Axis2Placement coordinate system is
  right-handed, its "Direction" is always equal to the
  cross product of its "X Direction" and "Y Direction".
  The "Direction" of a coordinate system is called the
  "main Direction" because when this unit vector is
  modified, the "X Direction" and "Y Direction" are
  recomputed, whereas when the "X Direction" or "Y <br> Direction" is changed, the "main Direction" is
  retained. The "main Direction" is also the "Z Direction".
  Note: Geom_Axis2Placement coordinate systems
  provide the same kind of "geometric" services as
  gp_Ax2 coordinate systems but have more complex
  data structures. The geometric objects provided by
  the Geom package use gp_Ax2 objects to include
  coordinate systems in their data structures, or to
  define the geometric transformations, which are applied to them.
  Geom_Axis2Placement coordinate systems are
  used in a context where they can be shared by
  several objects contained inside a common data structure.
  

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Constructor & Destructor Documentation

Geom_Axis2Placement::Geom_Axis2Placement

(

const gp_Ax2 &

A2

)

Geom_Axis2Placement::Geom_Axis2Placement	(	const gp_Pnt &	P,
		const gp_Dir &	N,
		const gp_Dir &	Vx
	)

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Member Function Documentation

gp_Ax2 Geom_Axis2Placement::Ax2

(

)

const

Handle_Geom_Geometry Geom_Axis2Placement::Copy

(

)

const [virtual]

Implements Geom_Geometry.

void Geom_Axis2Placement::SetAx2

(

const gp_Ax2 &

A2

)

void Geom_Axis2Placement::SetDirection

(

const gp_Dir &

V

)

[virtual]

Implements Geom_AxisPlacement.

void Geom_Axis2Placement::SetXDirection

(

const gp_Dir &

Vx

)

void Geom_Axis2Placement::SetYDirection

(

const gp_Dir &

Vy

)

void Geom_Axis2Placement::Transform

(

const gp_Trsf &

T

)

[virtual]

Implements Geom_Geometry.

const gp_Dir& Geom_Axis2Placement::XDirection

(

)

const

const gp_Dir& Geom_Axis2Placement::YDirection

(

)

const

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

• Geom_Axis2Placement.hxx