IFC 4.3.x development

8.13.3.6 IfcTextLiteralWithExtent

Change log

IFC4

additionswhere_rulesWR31
deletionswhere_rulesWR31

IFC4X1

additionswhere_rulesWR31
deletionswhere_rulesWR31

IFC4X2

additionswhere_rulesWR31
deletionswhere_rulesWR31

IFC4X3_RC3

additionswhere_rulesWR31
deletionswhere_rulesWR31

8.13.3.6.1 Semantic definitions at the entity

The text literal with extent is a text literal with the additional explicit information of the planar extent. An alignment attribute defines how the text box is aligned to the placement and how it may expand if additional lines of text need to be added.

Figure 1 shows the use of planar extent and box alignment to position the text string

"IfcTextLiteralWithExtent_Fig1.png 8,1 KB"

The planar extent defines the box model within which the text is placed. Padding maybe defined in the text style that offsets the text from the box to its inside.

NOTE  Entity adapted from text_literal_with_extent defined in ISO10303-46

HISTORY  New entity in IFC2x2.

IFC2x3 CHANGE  The IfcTextLiteralWithExtent has been changed by adding BoxAlignment.

8.13.3.6.1 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
IfcTextLiteral
1 Literal IfcPresentableText The text literal to be presented.
2 Placement IfcAxis2Placement An IfcAxis2Placement that determines the placement and orientation of the presented string.
3 Path IfcTextPath The writing direction of the text literal.
IfcTextLiteralWithExtent
4 Extent IfcPlanarExtent The extent in the x and y direction of the text literal.
5 BoxAlignment IfcBoxAlignment The alignment of the text literal relative to its position.

8.13.3.6.2 Entity inheritance

dot_inheritance IfcTextLiteralWithExtent IfcTextLiteralWithExtent IfcTextLiteral IfcTextLiteral IfcTextLiteralWithExtent->IfcTextLiteral IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcTextLiteral->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.13.3.6.3 Formal representations

ENTITY IfcTextLiteralWithExtent
 SUBTYPE OF (IfcTextLiteral);
	Extent : IfcPlanarExtent;
	BoxAlignment : IfcBoxAlignment;
 WHERE
	WR31 : NOT('IFC4X3_DEV_a1492713.IFCPLANARBOX' IN TYPEOF(Extent));
END_ENTITY;