IfcPointOnCurve

Definition from ISO/CD 10303-42:1992: A point on curve is a point which lies on a curve. The point is determined by evaluating the curve at a specific parameter value. The coordinate space dimensionality of the point is that of the basis curve.

NOTE: Corresponding STEP entity: point_on_curve. Please refer to ISO/IS 10303-42:1994, p. 23 for the final definition of the formal standard.

HISTORY: New entity in Release IFC2x Edition 2.

Informal Propositions:

The value of the point parameter shall not be outside the parametric range of the curve.

EXPRESS specification:

ENTITY IfcPointOnCurve

SUBTYPE OF (

IfcPoint);

BasisCurve

IfcCurve;

PointParameter

IfcParameterValue;

DERIVE

Dim

IfcDimensionCount := BasisCurve.Dim;

END_ENTITY;

Attribute definitions:

BasisCurve	:	The curve to which point parameter relates.
PointParameter	:	The parameter value of the point location.
Dim	:	The space dimensionality of this class, determined by the space dimensionality of the basis curve.

Inheritance graph

ENTITY IfcPointOnCurve;

ENTITY IfcRepresentationItem;

INVERSE

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR AssignedItems;

StyledByItem

SET [0:1] OF IfcStyledItem FOR Item;

ENTITY IfcGeometricRepresentationItem;

ENTITY IfcPoint;