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IKO_gp_Ax2
IKO_gp_Ax2 Interface
Describes a right-handed coordinate system in 3D space.
A coordinate system is defined by:
- its origin (also referred to as its "Location point"), and
- three orthogonal unit vectors, termed respectively the
"X Direction", the "Y Direction" and the "Direction" (also
referred to as the "main Direction").
The "Direction" of the coordinate system is called its
"main Direction" because whenever this unit vector is
modified, the "X Direction" and the "Y Direction" are
recomputed. However, when we modify either the "X <br> Direction" or the "Y
Direction", "Direction" is not modified.
The "main Direction" is also the "Z Direction".
Since an Ax2 coordinate system is right-handed, its
"main Direction" is always equal to the cross product of
its "X Direction" and "Y Direction". (To define a
left-handed coordinate system, use gp_Ax3
A coordinate system is used:
- to describe geometric entities, in particular to position
them. The local coordinate system of a geometric
entity serves the same purpose as the STEP function
"axis placement two axes", or
- to define geometric transformations.
Note: we refer to the "X Axis", "Y Axis" and "Z Axis",
respectively, as to axes having:
- the origin of the coordinate system as their origin, and
- the unit vectors "X Direction", "Y Direction" and "main <br> Direction",
respectively, as their unit vectors.
The "Z Axis" is also the "main Axis".
Query IKO_gp_Object from this interface to
obtain or modify location and orientation of the plane
Query IKO_gp_Transformation to transform position and orientation
Query IKO_Standard_Object to create a copy or obtain type name
Methods:
- SetDirection
- Direction
- SetLocation
- Location
- SetXDirection
- XDirection
- SetYDirection
- YDirection
- Axis
HRESULT SetDirection(DIVect* V)
Parameters
V -[in] Direction vector
-
HRESULT SetDirection(DIVect* vZAxis)
Sets direction of Z axis
HRESULT Direction(DIVect* vZAxis)
Returns direction of Z axis
HRESULT SetLocation(DIPoint* pt)
pt -[in] Location of the system
HRESULT Location(DIPoint* pt)
Retuns location of system
HRESULT SetXDirection(DIVect* V)
Changes the "Xdirection" of . The main direction "Direction" is not
modified, the "Ydirection" is modified. If is not normal to the main
direction then
is computed as follows XDirection = Direction ^ (Vx ^ Direction). Exceptions
Standard_ConstructionError if Vx or Vy is parallel to the "main Direction" of
this coordinate system.
HRESULT XDirection(DIVect* V)
Returns X direction
HRESULT SetYDirection(DIVect* V)
Changes the "Ydirection" of this. The main direction is not modified but the
"Xdirection" is changed. If is not normal to the main direction then
"YDirection" is computed as follows YDirection = Direction ^ ( ^ Direction).
Exceptions Standard_ConstructionError if Vx or Vy is parallel to the "main
Direction" of this coordinate system.
HRESULT YDirection(DIVect* V)of and Ax1* OReturns Y direction
HRESULT Axis(IKO_gp_Ax1** ZAxis)
Returns the main axis of . It is the "Location" point and the main
"Direction".
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