IfcPlanarExtent

平面范围定义沿二维坐标系的两个轴的范围，而不受其位置的影响。如果在三维坐标系中使用平面范围，则它定义沿x和y轴的范围。

注：实体改编自ISO10303-46中定义的平面_范围

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

 

EXPRESS Specification

ENTITY IfcPlanarExtent
 SUPERTYPE OF(IfcPlanarBox)
 SUBTYPE OF (IfcGeometricRepresentationItem);
  SizeInX : IfcLengthMeasure;
  SizeInY : IfcLengthMeasure;
END_ENTITY;