An IfcCurve is a curve in two-dimensional or three-dimensional space. It includes definitions for bounded and unbounded curves.
NOTE Definition according to ISO 10303-42:
A curve can be envisioned as the path of a point moving in its coordinate space.
NOTE Entity adapted from curve defined in ISO 10303-42
HISTORY New entity in IFC1.0
|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.
|Dim||INVALID||The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.|
ENTITY IfcCurve ABSTRACT SUPERTYPE OF (ONEOF (IfcBoundedCurve ,IfcConic ,IfcLine ,IfcOffsetCurve ,IfcPcurve ,IfcPolynomialCurve ,IfcSpiral ,IfcSurfaceCurve)) SUBTYPE OF (IfcGeometricRepresentationItem); DERIVE Dim : IfcDimensionCount := IfcCurveDim(SELF); END_ENTITY;