ISO 10303-214:2010(E)
An Axis2_placement_2d represents the location and orientation in two-dimensional space of two mutually perpendicular axes. An axis2_placement_2d is defined in terms of a point, (inherited from the placement supertype), and an axis. It can be used to locate and orientate an object in two-dimensional space and to define a placement coordinate system. The entity includes a point which forms the origin of the placement coordinate system. A direction vector is required to complete the definition of the placement coordinate system.
The data associated with an Axis2_placement_2D are the following:
The ref_direction specifies the direction used to determine the direction of the local X axis. If ref_direction is omitted, this direction is taken from the geometric coordinate system.
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