IFC 4.3.x development

8.13.3.2 IfcPlanarBox

8.13.3.2.1 Semantic definitions at the entity

A planar box specifies an arbitrary rectangular box and its location in a two dimensional Cartesian coordinate system. If the planar box is used within a three-dimensional coordinate system, it defines the rectangular box within the XY plane.

NOTE  Entity adapted from planar_box defined in ISO10303-46

HISTORY  New entity in IFC2x2.

8.13.3.2.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcGeometricRepresentationItem
IfcPlanarExtent
1 SizeInX IfcLengthMeasure The extent in the direction of the x-axis.
2 SizeInY IfcLengthMeasure The extent in the direction of the y-axis.
IfcPlanarBox
3 Placement IfcAxis2Placement The IfcAxis2Placement positions a local coordinate system for the definition of the rectangle. The origin of this local coordinate system serves as the lower left corner of the rectangular box.



> NOTE  In case of a 3D placement by _IfcAxisPlacement3D the IfcPlanarBox is defined within the xy plane of the definition coordinate system._

8.13.3.2.2 Entity inheritance

dot_inheritance IfcPlanarBox IfcPlanarBox IfcPlanarExtent IfcPlanarExtent IfcPlanarBox->IfcPlanarExtent IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcPlanarExtent->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.13.3.2.3 Formal representations

ENTITY IfcPlanarBox
 SUBTYPE OF (IfcPlanarExtent);
	Placement : IfcAxis2Placement;
END_ENTITY;