IfcTextLiteralWithExtent

带范围的文本文本是具有平面范围的附加显式信息的文本文本文本。对齐属性定义文本框如何与位置对齐，以及如果需要添加额外的文本行，它将如何展开。

图显示了使用平面范围和框对齐来定位文本字符串

图-带范围和对齐的文本文本文本

平面范围定义放置文本的框模型。填充可能是在文本样式中定义的，它将文本从框中偏移到其内部。

注：实体改编自ISO10303-46中定义的文本_字面量

IFC2x2中增加的新实体。

IFC2x3更改通过添加BoxAlignment更改了IfcTextLiteralWithExtent。

Formal Propositions

Rule	Description
WR31	The subtype of IfcPlanarExtent, IfcPlanarBox, should not be used to represent an Extent for the text literal.

 

#	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
IfcTextLiteral
1	Literal	IfcPresentableText	[1:1]	The text literal to be presented.	X
2	Placement	IfcAxis2Placement	[1:1]	An IfcAxis2Placement that determines the placement and orientation of the presented string.	X
3	Path	IfcTextPath	[1:1]	The writing direction of the text literal.	X
IfcTextLiteralWithExtent
4	Extent	IfcPlanarExtent	[1:1]	The extent in the x and y direction of the text literal.	X
5	BoxAlignment	IfcBoxAlignment	[1:1]	The alignment of the text literal relative to its position.	X

 

EXPRESS Specification

ENTITY IfcTextLiteralWithExtent
 SUBTYPE OF (IfcTextLiteral);
  Extent : IfcPlanarExtent;
  BoxAlignment : IfcBoxAlignment;
 WHERE
  WR31 : NOT('IFCPRESENTATIONDEFINITIONRESOURCE.IFCPLANARBOX' IN TYPEOF(Extent));
END_ENTITY;