Defined in File Ifc4x3_rc1.h
IfcAxis2Placement2D: public Ifc4x3_rc1::IfcPlacement¶
Definition from ISO/CD 10303-42:1992: 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 originate an object in two dimensional space and to define a placement coordinate system. The class 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 reference direction defines the placement X axis direction, the placement Y axis is derived from this.
If the RefDirection attribute is not given, the placement defaults to P (x-axis) as [1.,0.] and P (y-axis) as [0.,1.].
NOTE Corresponding ISO 10303 name: axis2_placement_2d, please refer to ISO/IS 10303-42:1994, p. 28 for the final definition of the formal standard.
HISTORY New entity in IFC Release 1.5.
Figure 275 illustrates the definition of the IfcAxis2Placement2D within the two-dimensional coordinate system.
Figure 275 — Axis2 placement 2D
Whether the optional attribute RefDirection is defined for this IfcAxis2Placement2D.
The direction used to determine the direction of the local X axis. If a value is omited that it defaults to [1.0, 0.0.].