IFC 4.3.0.0 (IFC4X3) final

8.9.3.25 IfcCurve

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:

  1. A curve shall be arcwise connected
  2. 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.
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.
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 8.9.3.25.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;

8.9.3.25.5 References