IfcPlanarBox

平面长方体指定任意矩形长方体及其在二维笛卡尔坐标系中的位置。如果平面长方体在三维坐标系中使用，它将定义XY平面内的矩形框。

注：实体改编自ISO10303-46中定义的平面盒

IFC2x2中增加的新实体。

 

 

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment 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.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcGeometricRepresentationItem
IfcPlanarExtent
1	SizeInX	IfcLengthMeasure	[1:1]	The extent in the direction of the x-axis.	X
2	SizeInY	IfcLengthMeasure	[1:1]	The extent in the direction of the y-axis.	X
IfcPlanarBox
3	Placement	IfcAxis2Placement	[1:1]	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.	X

EXPRESS Specification

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