 | Alignment Curve |
| Item | SPF | XML | Change | Description | IFC4x1 Final 4.1.0.0 |
|---|---|---|---|---|
| IfcAlignmentCurve | ADDED | IFC4x2 Candidate 4.2.0.0 | ||
| IfcAlignmentCurve | ||||
| PositioningElement | ADDED | IFC4x1 Final 4.1.0.0 | ||
| IfcAlignmentCurve | ADDED | IFC4x2 Candidate 4.2.0.0 | ||
| IfcAlignmentCurve | ||||
| PositioningElement | ADDED | IFC4x2 to IFC4x3_RC1 | ||
| IfcAlignmentCurve | ||||
| PositioningElement | MODIFIED | Aggregation changed from NONE to SET. |
An IfcAlignmentCurve describes a 3D curve based on a 2D vertical curve defined along the path of a 2D horizontal curve.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 1 | Horizontal | IfcAlignment2DHorizontal | The horizontal component of the curve. | X | |
| 2 | Vertical | IfcAlignment2DVertical | ? | The vertical component of the curve, which is defined relative to the horizontal curve. | X |
| 3 | Tag | IfcLabel | ? | Optional identifier of the curve, which may be used to correlate points from a variable cross-section. | X |
| # | 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 | |||||
| IfcCurve | |||||
| Dim :=IfcCurveDim(SELF) | IfcDimensionCount | The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. | X | ||
| IfcBoundedCurve | |||||
| PositioningElement | IfcLinearPositioningElement @Axis | ? S[0:1] | X | ||
| IfcAlignmentCurve | |||||
| 1 | Horizontal | IfcAlignment2DHorizontal | The horizontal component of the curve. | X | |
| 2 | Vertical | IfcAlignment2DVertical | ? | The vertical component of the curve, which is defined relative to the horizontal curve. | X |
| 3 | Tag | IfcLabel | ? | Optional identifier of the curve, which may be used to correlate points from a variable cross-section. | X |
<xs:element name="IfcAlignmentCurve" type="ifc:IfcAlignmentCurve" substitutionGroup="ifc:IfcBoundedCurve" nillable="true"/>
<xs:complexType name="IfcAlignmentCurve">
<xs:complexContent>
<xs:extension base="ifc:IfcBoundedCurve">
<xs:sequence>
<xs:element name="Horizontal" type="ifc:IfcAlignment2DHorizontal" nillable="true"/>
<xs:element name="Vertical" type="ifc:IfcAlignment2DVertical" nillable="true" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="Tag" type="ifc:IfcLabel" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcAlignmentCurve
SUBTYPE OF (IfcBoundedCurve);
Horizontal : IfcAlignment2DHorizontal;
Vertical : OPTIONAL IfcAlignment2DVertical;
Tag : OPTIONAL IfcLabel;
END_ENTITY;
References: IfcAlignment2DHorizontal
IfcAlignment2DVertical
EXPRESS-G diagram
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