IFC 4.3.0.1 (IFC4X3) development

8.9.3.22 IfcCompositeCurveSegment

8.9.3.22.1 Semantic definition

An IfcCompositeCurveSegment is a bounded curve constructed for the sole purpose to be a segment within an IfcCompositeCurve.

8.9.3.22.2 Entity inheritance

8.9.3.22.3 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.

IfcSegment (2)
1 Transition IfcTransitionCode

Connectivity between the continuous segments is not enforced per se to be tangential. Setting "TangentialContinuity" to True means that the current segment shall continue with tangential continuity to the previous one.

UsingCurves SET [1:?] OF IfcCompositeCurve FOR Segments

The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.

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IfcCompositeCurveSegment (3)
2 SameSense IfcBoolean

An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.

3 ParentCurve IfcCurve

The bounded curve which defines the geometry of the segment.

* Dim IfcDimensionCount

This attribute is formally derived.

ParentCurve.Dim

The space dimensionality of this class, defined by the dimensionality of the first ParentCurve.

Table 8.9.3.22.A

8.9.3.22.4 Formal propositions

Name Description
ParentIsBoundedCurve

The parent curve shall be a bounded curve.

('IFC4X3_DEV_64d1fa4d.IFCBOUNDEDCURVE' IN TYPEOF(ParentCurve))
Table 8.9.3.22.B

8.9.3.22.5 Formal representation

ENTITY IfcCompositeCurveSegment
 SUPERTYPE OF (ONEOF
	(IfcReparametrisedCompositeCurveSegment))
 SUBTYPE OF (IfcSegment);
	SameSense : IfcBoolean;
	ParentCurve : IfcCurve;
 DERIVE
	 Dim : IfcDimensionCount := ParentCurve.Dim;
 WHERE
	ParentIsBoundedCurve : ('IFC4X3_DEV_64d1fa4d.IFCBOUNDEDCURVE' IN TYPEOF(ParentCurve));
END_ENTITY;

8.9.3.22.6 References

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8.9.3.22.7 Changelog

  • where rule, ParentIsBoundedCurve
  • where rule, WR1
  • attribute SameSense type, Changed from "boolean" to "IfcBoolean"