IfcPointOnCurve是由其定义曲线的参数值定义的点。
注：定义根据ISO/CD 10303-42:1992
IfcPointOnCurve是位于曲线上的点。通过在特定参数值下评估曲线来确定点。点的坐标空间维数为基曲线的坐标空间维数。
注：实体改编自ISO 10303-42中_曲线上的点。
IFC2x2中增加的新实体。
非正式提议：
●点参数的值不应超出曲线的参数范围
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 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. | 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. | X | |
| IfcGeometricRepresentationItem | |||||
| IfcPoint | |||||
| IfcPointOnCurve | |||||
| 1 | BasisCurve | IfcCurve | [1:1] | The curve to which point parameter relates. | X |
| 2 | PointParameter | IfcParameterValue | [1:1] | The parameter value of the point location. | X |
| Dim :=BasisCurve.Dim |
IfcDimensionCount | [1:1] | The space dimensionality of this class, determined by the space dimensionality of the basis curve. | X | |
EXPRESS Specification
ENTITY IfcPointOnCurve
SUBTYPE OF (IfcPoint);
BasisCurve : IfcCurve;
PointParameter : IfcParameterValue;
DERIVE
Dim : IfcDimensionCount := BasisCurve.Dim;
END_ENTITY;