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.
Definition according to ISO/CD 10303-42:1992 A composite curve segment is a bounded curve together with transition information which is used to construct a composite curve. Entity adapted from composite_curve_segment defined in ISO 10303-42. New entity in IFC1.08.9.3.22.2 Entity inheritance
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- IfcSegment
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
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. The inverse attribute LayerAssignments has been added. 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. The inverse attribute StyledByItem has been added. |
|
| IfcSegment (3) | |||
| 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. |
|
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this abstract class, handled by a function specific for concrete subtypes which returns the dimensionality of the ParentCurve attribute (defined on both subtypes). |
| Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes | |||
| IfcCompositeCurveSegment (2) | |||
| 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. If the datatype of ParentCurve is IfcTrimmedCurve, the value of SameSense overrides the value of IfcTrimmedCurve.SenseAgreement |
| 3 | ParentCurve | IfcCurve |
The bounded curve which defines the geometry of the segment. |
8.9.3.22.4 Formal propositions
| Name | Description |
|---|---|
| ParentIsBoundedCurve |
The parent curve shall be a bounded curve. |
|
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8.9.3.22.5 Examples
8.9.3.22.6 Formal representation
ENTITY IfcCompositeCurveSegment
SUPERTYPE OF (ONEOF
(IfcReparametrisedCompositeCurveSegment))
SUBTYPE OF (IfcSegment);
SameSense : IfcBoolean;
ParentCurve : IfcCurve;
WHERE
ParentIsBoundedCurve : ('IFC4X3_DEV_bc7847cd.IFCBOUNDEDCURVE' IN TYPEOF(ParentCurve));
END_ENTITY;