标签：indicator entity assign appear whether oat tor items fine
IfcCompositeCurve segment是一条有界曲线，其唯一目的是成为IfcCompositeCurve中的一段。
注释定义符合ISO/CD 10303-42:1992
复合曲线段是一条有界曲线，它与过渡信息一起用于构造复合曲线。
注：实体改编自ISO 10303-42中定义的复合曲线段。
在IFC1.0中增加的新实体
Formal Propositions
| Rule | Description |
|---|---|
| ParentIsBoundedCurve | The parent curve shall be a bounded curve. |
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 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. | 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. | X | |
| IfcGeometricRepresentationItem | |||||
| IfcCompositeCurveSegment | |||||
| 1 | Transition | IfcTransitionCode | [1:1] | 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 | [1:1] | 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 | [1:1] | 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 | [1:1] | The space dimensionality of this class, defined by the dimensionality of the first ParentCurve. | X | |
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;
标签：indicator entity assign appear whether oat tor items fine
原文地址：https://www.cnblogs.com/herd/p/13178230.html
