IfcStyledItem

IfcStyledItem保存产品的表示样式信息，可以显式地用于IfcGeometricRepresentationItem作为分配给产品的IfcShapeRepresentation的一部分，或者通过将表示信息分配给被指定为产品的其他表示的IfcMaterial。

①如果IfcStyledItem在来自IfcProductDefinitionShape的引用中使用，则应提供一个项目。

②如果IfcStyledItem在来自IfcMaterialDefinitionRepresentation的引用中使用，则不应提供任何项目。

●注：定义根据ISO/CD 10303-46:1992

样式项是在表示中使用的几何表示项的表示样式的赋值。

●注：实体改编自ISO10303-46中定义的样式项。

IFC2x2中增加的新实体。

IFC2x2附录1更改了实体IfcStyledItem已变得非抽象并添加了属性名。

如果c2x3 CHANGE The attribute Item已设为可选，则可保证基于文件的交换的向上兼容性。

IFC4更改子类型IfcAnnotationOccurrence并删除其子类型。对所有实例化使用IfcStyledItem。样式的数据类型已更改为IfcStyleAssignmentSelect

使用定义

下图说明了IfcStyledItem在两个使用示例中的用法：

①作为几何表示项的表示

②作为材质定义的表示

注意，新的IfcStyleAssignmentSelect允许直接赋值样式，例如IfcCurveStyle、IfcSurfaceStyle，而不使用中间的IfcPresentationStyleAssignment

Rule	Description
ApplicableItem	A styled item cannot be styled by another styled item.

 

#	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
IfcStyledItem
1	Item	IfcRepresentationItem	[0:1]	A geometric representation item to which the style is assigned.	X
2	Styles	IfcStyleAssignmentSelect	S[1:?]	Representation styles which are assigned, either to an geometric representation item, or to a material definition.	X
3	Name	IfcLabel	[0:1]	The word, or group of words, by which the styled item is referred to.	X

EXPRESS Specification

ENTITY IfcStyledItem
 SUBTYPE OF (IfcRepresentationItem);
  Item : OPTIONAL IfcRepresentationItem;
  Styles : SET [1:?] OF IfcStyleAssignmentSelect;
  Name : OPTIONAL IfcLabel;
 WHERE
  ApplicableItem : NOT('IFCPRESENTATIONAPPEARANCERESOURCE.IFCSTYLEDITEM' IN TYPEOF(Item));
END_ENTITY;