Polylinie | |

Polyline | |

Polyligne |

The IfcPolyline is a bounded curve with only linear segments defined by a list of Cartesian points. If the first and the last Cartesian point in the list are identical, then the polyline is a closed curve, otherwise it is an open curve.

EXAMPLE Figure 394 illustrates a bounded IfcPolyline and shows the parametric length of each segment and of the total polyline. The parametric length of the entire polyline isn- 1, wherenis the number ofPoints.

Figure 394 — Bounded IfcPolyline with parametric length |

NOTE Definition according to ISO/CD 10303-42:1992

A polyline is a bounded curve ofn- 1 linear segments, defined by a list ofnpoints, P_{1}, P_{2}... P_{n}. Thei^{th}segment of the curve is parameterized as follows:wherefor1 ≤i≤n- 1i- 1 ≤u≤iand with parametric range of 0 ≤u≤n- 1.

NOTE Entity adapted frompolylinein ISO 10303-42.

HISTORY New entity in IFC1.0

# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|

1 | Points | IfcCartesianPoint | L[2:?] | The points defining the polyline. | X |

Rule | Description |
---|---|

SameDim | The space dimensionality of all Points shall be the same. |

# | 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 | |||||

IfcPolyline | |||||

1 | Points | IfcCartesianPoint | L[2:?] | The points defining the polyline. | X |

` <xs:element name="IfcPolyline" type="ifc:IfcPolyline" substitutionGroup="ifc:IfcBoundedCurve" nillable="true"/>`

<xs:complexType name="IfcPolyline">

<xs:complexContent>

<xs:extension base="ifc:IfcBoundedCurve">

<xs:sequence>

<xs:element name="Points">

<xs:complexType>

<xs:sequence>

<xs:element ref="ifc:IfcCartesianPoint" minOccurs="2" maxOccurs="unbounded"/>

</xs:sequence>

<xs:attribute ref="ifc:itemType" fixed="ifc:IfcCartesianPoint"/>

<xs:attribute ref="ifc:cType" fixed="list"/>

<xs:attribute ref="ifc:arraySize" use="optional"/>

</xs:complexType>

</xs:element>

</xs:sequence>

</xs:extension>

</xs:complexContent>

</xs:complexType>

```
ENTITY IfcPolyline
```

SUBTYPE OF (IfcBoundedCurve)**;**

Points : LIST [2:?] OF IfcCartesianPoint;

WHERE

SameDim : SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0;

END_ENTITY;