Circular Arc Segment 2D |

Item | SPF | XML | Change | Description |
---|---|---|---|---|

IFC4x1 Release Candidate 1 |
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IfcCircularArcSegment2D | ADDED | |||

IFC4x2 FINAL |
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IfcCircularArcSegment2D | ||||

PositioningElement | ADDED |

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.

Figure 370 — Circular arc segment 2D | Figure 371 — 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 IFC4 CHANGE The inverse attribute | 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 | 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 | ? | 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;