 | Reparametrisiertes Segment einer zusammengesetzten Kurve |
 | Reparametrised Composite Curve Segment |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
|---|---|---|---|---|
| IfcReparametrisedCompositeCurveSegment | ADDED | IFC4 Addendum 1 | ||
| IfcReparametrisedCompositeCurveSegment | ||||
| SameSense | MODIFIED | Type changed from BOOLEAN to IfcBoolean. |
The IfcReparametrisedCompositeCurveSegment is geometrically identical to a IfcCompositeCurveSegment but with the additional capability of reparametrization.
NOTE Definition according to ISO/CD 10303-42:1992
The reparametrised composite curve segment is a special type of composite curve segment which provides the capability to re-define its parametric length without changing its geometry.
Let l = ParamLength. If t0 ≤ t ≤ t1 is the parameter range of ParentCurve, the new parameter . for the reparametrised composite curve segment is given by the equation:or by the equation:if SameSense = TRUE;
if SameSense = FALSE;
NOTE Entity adapted from reparametrised_composite_curve_segment in ISO 10303-42.
HISTORY New entity in IFC4
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 4 | ParamLength | IfcParameterValue | X |
| Rule | Description |
|---|---|
| PositiveLengthParameter | The ParamLength shall be greater than zero. |
| # | 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 LayerAssignments has been added. IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed. | 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 StyledByItem has been added. | 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 ParentCurve is IfcTrimmedCurve, the value of SameSense overrides the value of IfcTrimmedCurve.SenseAgreement | 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 | ||
| IfcReparametrisedCompositeCurveSegment | |||||
| 4 | ParamLength | IfcParameterValue | X | ||
<xs:element name="IfcReparametrisedCompositeCurveSegment" type="ifc:IfcReparametrisedCompositeCurveSegment" substitutionGroup="ifc:IfcCompositeCurveSegment" nillable="true"/>
<xs:complexType name="IfcReparametrisedCompositeCurveSegment">
<xs:complexContent>
<xs:extension base="ifc:IfcCompositeCurveSegment">
<xs:attribute name="ParamLength" type="ifc:IfcParameterValue" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcReparametrisedCompositeCurveSegment
SUBTYPE OF (IfcCompositeCurveSegment);
ParamLength : IfcParameterValue;
WHERE
PositiveLengthParameter : ParamLength > 0.0;
END_ENTITY;
EXPRESS-G diagram
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