Segment einer zusammengesetzten Kurve | |

Composite Curve Segment | |

Segment de courbe composite |

Item | SPF | XML | Change | Description |
---|---|---|---|---|

IFC4 Addendum 1 |
||||

IfcCompositeCurveSegment | ||||

SameSense | MODIFIED | Type changed from BOOLEAN to IfcBoolean. |

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

NOTE 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.

NOTE Entity adapted fromcomposite_curve_segmentdefined in ISO 10303-42.

HISTORY New entity in IFC1.0

# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|

1 | Transition | IfcTransitionCode | The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve. | X | |

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.
NOTE If the datatype of | X | |

3 | ParentCurve | IfcCurve | The bounded curve which defines the geometry of the segment. | X | |

UsingCurves | IfcCompositeCurve @Segments | S[1:?] | The set of composite curves which use this composite curve segment as a segment. This set shall not be empty. | X | |

Dim :=ParentCurve.Dim | IfcDimensionCount | The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. | X |

Rule | Description |
---|---|

ParentIsBoundedCurve | The parent curve shall be a bounded curve. |

# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|

IfcRepresentationItem | |||||

LayerAssignment | IfcPresentationLayerAssignment @AssignedItems | S[0:1] | 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 IFC4 CHANGE The inverse attribute | X | |

StyledByItem | IfcStyledItem @Item | S[0:1] | 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 | X | |

IfcGeometricRepresentationItem | |||||

IfcCompositeCurveSegment | |||||

1 | Transition | IfcTransitionCode | The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve. | X | |

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.
NOTE If the datatype of | X | |

3 | ParentCurve | IfcCurve | The bounded curve which defines the geometry of the segment. | X | |

UsingCurves | IfcCompositeCurve @Segments | S[1:?] | The set of composite curves which use this composite curve segment as a segment. This set shall not be empty. | X | |

Dim :=ParentCurve.Dim | IfcDimensionCount | The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. | X |

` <xs:element name="IfcCompositeCurveSegment" type="ifc:IfcCompositeCurveSegment" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>`

<xs:complexType name="IfcCompositeCurveSegment">

<xs:complexContent>

<xs:extension base="ifc:IfcGeometricRepresentationItem">

<xs:sequence>

<xs:element name="ParentCurve" type="ifc:IfcCurve" nillable="true"/>

</xs:sequence>

<xs:attribute name="Transition" type="ifc:IfcTransitionCode" use="optional"/>

<xs:attribute name="SameSense" type="ifc:IfcBoolean" use="optional"/>

</xs:extension>

</xs:complexContent>

</xs:complexType>

```
ENTITY IfcCompositeCurveSegment
```

SUPERTYPE OF(IfcReparametrisedCompositeCurveSegment)

SUBTYPE OF (IfcGeometricRepresentationItem)**;**

Transition : IfcTransitionCode;

SameSense : IfcBoolean;

ParentCurve : IfcCurve;

INVERSE

UsingCurves : SET [1:?] OF IfcCompositeCurve FOR Segments;

DERIVE

Dim : IfcDimensionCount := ParentCurve.Dim;

WHERE

ParentIsBoundedCurve : ('IFCGEOMETRYRESOURCE.IfcBoundedCurve' IN TYPEOF(ParentCurve));

END_ENTITY;

References: IfcCompositeCurve