IfcPolyline

Definition from ISO/CD 10303-42:1992: An IfcPolyline is a bounded curve of n -1 linear segments, defined by a list of n points, P1, P2 ... Pn. The curve is parameterized as follows:

for 1 £ i £ n - 1, where i -1 £ u £ i and with parametric range of 0 £ u £ n - 1.

NOTE Corresponding STEP entity: polyline. Please refer to ISO/IS 10303-42:1994, p. 45 for the final definition of the formal standard.

HISTORY New class in IFC Release 1.0

EXPRESS specification:

ENTITY IfcPolyline

SUBTYPE OF (

IfcBoundedCurve);

Points

LIST [2:?] OF IfcCartesianPoint;

WHERE

WR41

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

END_ENTITY;

Attribute definitions:

Points

The points defining the polyline.

Formal Propositions:

WR41

The space dimensionality of all Points shall be the same.

Inheritance graph

ENTITY IfcPolyline;

ENTITY IfcRepresentationItem;

INVERSE

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR AssignedItems;

StyledByItem

SET [0:1] OF IfcStyledItem FOR Item;

ENTITY IfcGeometricRepresentationItem;

ENTITY IfcCurve;

DERIVE

Dim

IfcDimensionCount := IfcCurveDim(SELF);

ENTITY IfcBoundedCurve;

ENTITY IfcPolyline;

Points

LIST [2:?] OF IfcCartesianPoint;

END_ENTITY;