| | Describes an axis in the plane (2D space).
An axis is defined by:
- its origin (also referred to as its "Location point"), and
- its unit vector (referred to as its "Direction").
An axis implicitly defines a direct, right-handed
coordinate system in 2D space by:
- its origin,
- its "Direction" (giving the "X Direction" of the coordinate system), and
- the unit vector normal to "Direction" (positive angle
measured in the trigonometric sense).
An axis is used:
- to describe 2D geometric entities (for example, the
axis which defines angular coordinates on a circle).
It serves for the same purpose as the STEP function
"axis placement one axis", or
- to define geometric transformations (axis of
symmetry, axis of rotation, and so on).
Note: to define a left-handed 2D coordinate system, use gp_Ax22d.
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1.6.3