 | Circular Arc Segment 2D |
| Item | SPF | XML | Change | Description | IFC4x1 Final 4.1.0.0 |
|---|---|---|---|---|
| IfcCircularArcSegment2D | ADDED | IFC4x2 Candidate 4.2.0.0 | ||
| IfcCircularArcSegment2D | ||||
| PositioningElement | ADDED | IFC4x1 Final 4.1.0.0 | ||
| IfcCircularArcSegment2D | ADDED | IFC4x2 Candidate 4.2.0.0 | ||
| IfcCircularArcSegment2D | ||||
| PositioningElement | ADDED | IFC4x2 to IFC4x3_RC1 | ||
| IfcCircularArcSegment2D | ||||
| PositioningElement | MODIFIED | Aggregation changed from NONE to SET. |
The circular arc segment uses the inherited attributes StartPoint as the start of the circular arc, StartDirection as the tangent at the start point and SegmentLength as the arc length.
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Figure 362 — Circular arc segment 2D | Figure 363 — Circular arc segment 2D CCW |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 4 | Radius | IfcPositiveLengthMeasure | The radius of the circular arc | X | |
| 5 | IsCCW | IfcBoolean | (counter-clockwise or clockwise) as the orientation of the circular arc with Boolean=”true” being counter-clockwise, or “to the left", and Boolean=”false” being clockwise, or “to the right”. | 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 | ||
| 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 | |
| IfcCircularArcSegment2D | |||||
| 4 | Radius | IfcPositiveLengthMeasure | The radius of the circular arc | X | |
| 5 | IsCCW | IfcBoolean | (counter-clockwise or clockwise) as the orientation of the circular arc with Boolean=”true” being counter-clockwise, or “to the left", and Boolean=”false” being clockwise, or “to the right”. | X | |
<xs:element name="IfcCircularArcSegment2D" type="ifc:IfcCircularArcSegment2D" substitutionGroup="ifc:IfcCurveSegment2D" nillable="true"/>
<xs:complexType name="IfcCircularArcSegment2D">
<xs:complexContent>
<xs:extension base="ifc:IfcCurveSegment2D">
<xs:attribute name="Radius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="IsCCW" type="ifc:IfcBoolean" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcCircularArcSegment2D
SUBTYPE OF (IfcCurveSegment2D);
Radius : IfcPositiveLengthMeasure;
IsCCW : IfcBoolean;
END_ENTITY;
EXPRESS-G diagram
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