8.9.3.25 IfcCurve

RV ⓘ

AbV ⓘ

ABSTRACT This definition may not be instantiated

8.9.3.25.1 Semantic definition

An IfcCurve is a curve in two-dimensional or three-dimensional space. It includes definitions for bounded and unbounded curves.

Informal Propositions

A curve shall be arcwise connected
A curve shall have an arc length greater than zero.

8.9.3.25.2 Entity inheritance

8.9.3.25.3 Attributes

#	Attribute	Type	Description
IfcRepresentationItem (2)
	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. 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.
Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcCurve (1)
*	Dim	IfcDimensionCount	This attribute is formally derived. `IfcCurveDim(SELF)` The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.

Table A

8.9.3.25.4 Formal representation

ENTITY IfcCurve
ABSTRACT SUPERTYPE OF (ONEOF
(IfcBoundedCurve
,IfcConic
,IfcLine
,IfcOffsetCurve
,IfcPcurve
,IfcPolynomialCurve
,IfcSpiral
,IfcSurfaceCurve))
SUBTYPE OF (IfcGeometricRepresentationItem);
DERIVE
Dim : IfcDimensionCount := IfcCurveDim(SELF);
END_ENTITY;