22.214.171.124.1 Semantic definition
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 126.96.36.199.A shows the use of planar extent and box alignment to position the text string
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.
188.8.131.52.2 Entity inheritance
|LayerAssignment||SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems||
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.
|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.
The text literal to be presented.
An IfcAxis2Placement that determines the placement and orientation of the presented string.
The writing direction of the text literal.
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The extent in the x and y direction of the text literal.
The alignment of the text literal relative to its position.
184.108.40.206.4 Formal propositions
The subtype of IfcPlanarExtent, IfcPlanarBox, should not be used to represent an Extent for the text literal.
220.127.116.11.5 Formal representation
ENTITY IfcTextLiteralWithExtent SUBTYPE OF (IfcTextLiteral); Extent : IfcPlanarExtent; BoxAlignment : IfcBoxAlignment; WHERE WR31 : NOT('IFC4X3_DEV_d297a43.IFCPLANARBOX' IN TYPEOF(Extent)); END_ENTITY;