The IfcAxis2Placement2D provides location and
orientation to place items in a two-dimensional space. The
attribute RefDirection defines the x axis, the y
axis is derived. If the attribute RefDirection is
not given, the placement defaults to P (x-axis) as [1.,0.]
and P (y-axis) as [0.,1.].
Figure 365 illustrates the definition of the
IfcAxis2Placement2D within the two-dimensional
Figure 365 — Axis2 placement 2D
NOTE Definition according to 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 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 reference direction
defines the placement X axis direction, the placement Y axis
is derived from this.
NOTE Entity adapted from
axis2_placement_2d defined in ISO 10303-42.
HISTORY New entity in IFC1.5.