Geom_AxisPlacement Class Reference

The abstract class AxisPlacement describes the
common behavior of positioning systems in 3D space,
such as axis or coordinate systems.
The Geom package provides two implementations of
3D positioning systems:
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#include <Geom_AxisPlacement.hxx>

Inheritance diagram for Geom_AxisPlacement:

Public Member Functions
void	SetAxis (const gp_Ax1 &A1)
	Assigns A1 as the "main Axis" of this positioning system. This modifies
virtual void	SetDirection (const gp_Dir &V)=0
	Changes the direction of the axis placement. If <me> is an axis placement two axis the main "Direction" is modified and the "XDirection" and "YDirection" are recomputed. Raises ConstructionError only for an axis placement two axis if V and the previous "XDirection" are parallel because it is not possible to calculate the new "XDirection" and the new "YDirection".
void	SetLocation (const gp_Pnt &P)
	Assigns the point P as the origin of this positioning system.
Standard_Real	Angle (const Handle< Geom_AxisPlacement > &Other) const
	Computes the angular value, in radians, between the "main Direction" of this positioning system and that of positioning system Other. The result is a value between 0 and Pi.
const gp_Ax1 &	Axis () const
	Returns the main axis of the axis placement. For an "Axis2placement" it is the main axis (Location, Direction ). For an "Axis1Placement" this method returns a copy of <me>.
gp_Dir	Direction () const
	Returns the main "Direction" of an axis placement.
gp_Pnt	Location () const
	Returns the Location point (origin) of the axis placement.
Protected Attributes
gp_Ax1	axis

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Detailed Description

• the axis (Geom_Axis1Placement class), which is defined by:
  
  • its origin, also termed the "Location point" of the axis,
    
  • its unit vector, termed the "Direction" or "main <br> Direction" of the axis;
    
• the right-handed coordinate system
  (Geom_Axis2Placement class), which is defined by:
  
• its origin, also termed the "Location point" of the coordinate system,
  
• three orthogonal unit vectors, termed
  respectively the "X Direction", the "Y Direction"
  and the "Direction" of the coordinate system. As
  the coordinate system is right-handed, these
  unit vectors have the following relation:
  "Direction" = "X Direction" ^
  "Y Direction". The "Direction" is also
  called the "main Direction" because, when the
  unit vector is modified, the "X Direction" and "Y <br> Direction" are recomputed, whereas when the "X <br> Direction" or "Y Direction" is modified, the "main Direction" does not change.
  The axis whose origin is the origin of the positioning
  system and whose unit vector is its "main Direction" is
  also called the "Axis" or "main Axis" of the positioning system.
  

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Member Function Documentation

Standard_Real Geom_AxisPlacement::Angle

(

const Handle< Geom_AxisPlacement > &

Other

)

const

const gp_Ax1& Geom_AxisPlacement::Axis

(

)

const

gp_Dir Geom_AxisPlacement::Direction

(

)

const

gp_Pnt Geom_AxisPlacement::Location

(

)

const

void Geom_AxisPlacement::SetAxis

(

const gp_Ax1 &

A1

)

• its origin, and
  
• its "main Direction".
  If this positioning system is a
  Geom_Axis2Placement, then its "X Direction" and
  "Y Direction" are recomputed.
  Exceptions
  For a Geom_Axis2Placement:
  Standard_ConstructionError if A1 and the
  previous "X Direction" of the coordinate system are parallel.
  

virtual void Geom_AxisPlacement::SetDirection

(

const gp_Dir &

V

)

[pure virtual]

Implemented in Geom_Axis1Placement, and Geom_Axis2Placement.

void Geom_AxisPlacement::SetLocation

(

const gp_Pnt &

P

)

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Field Documentation

gp_Ax1 Geom_AxisPlacement::axis [protected]

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

• Geom_AxisPlacement.hxx