| | Describes a coordinate system in a plane (2D space).
A coordinate system is defined by:
- its origin (also referred to as its "Location point"), and
- two orthogonal unit vectors, respectively, called the "X <br>
Direction" and the "Y Direction".
A gp_Ax22d may be right-handed ("direct sense") or
left-handed ("inverse" or "indirect sense").
You use a gp_Ax22d to:
- describe 2D geometric entities, in particular to position
them. The local coordinate system of a geometric
entity serves for the same purpose as the STEP
function "axis placement two axes", or
- define geometric transformations.
Note: we refer to the "X Axis" and "Y Axis" as the axes having:
- the origin of the coordinate system as their origin, and
- the unit vectors "X Direction" and "Y Direction",
respectively, as their unit vectors.
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1.6.3