 | Line Segment 2D |
| Item | SPF | XML | Change | Description | IFC4x1 Release Candidate 1 |
|---|---|---|---|---|
| IfcLineSegment2D | ADDED |
The line segment is defined using the inherited start point, start distance and segment length parameter.
 |
Figure 373 — Line segment 2D |
| # | 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 | |||||
| IfcCurveSegment2D | |||||
| 1 | StartPoint | IfcCartesianPoint | The start point of the 2D curve as x/y coordinates defined by a 2D Cartesian point. | X | |
| 2 | StartDirection | IfcPlaneAngleMeasure | The direction of the tangent at the start point. Direction value 0. indicates a curve with a start tangent along the positive x-axis. Values increases counter-clockwise, and decreases clockwise. Depending on the plane angle unit, either degree or radians, the sensible range is -360° ≤ n ≤ 360° (or -2π ≤ n ≤ 2π). Values larger then a full circle (>|360°| or >|2 π| shall not be used. | X | |
| 3 | SegmentLength | IfcPositiveLengthMeasure | The length along the curve | X | |
| IfcLineSegment2D | |||||
<xs:element name="IfcLineSegment2D" type="ifc:IfcLineSegment2D" substitutionGroup="ifc:IfcCurveSegment2D" nillable="true"/>
<xs:complexType name="IfcLineSegment2D">
<xs:complexContent>
<xs:extension base="ifc:IfcCurveSegment2D"/>
</xs:complexContent>
</xs:complexType>
ENTITY IfcLineSegment2D
SUBTYPE OF (IfcCurveSegment2D);
END_ENTITY;
EXPRESS-G diagram
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