IFC 4.3.x development

8.12.3.16 IfcFillAreaStyleTiles

Change log

IFC4

modificationsattributes Tiles definition Changed from set[1:?] of IfcFillAreaStyleTileShapeSelect to set[1:?] of IfcStyledItem
modificationsattributes TilingPattern definitionChanged from IfcOneDirectionRepeatFactor to list[2:2] of IfcVector

8.12.3.16.1 Semantic definitions at the entity

The IfcFillAreaStyleTiles defines the filling of an IfcAnnotationFillArea by recurring patterns of styled two dimensional geometry, called a tile. The recurrence pattern is determined by two vectors, that multiply the tile in regular form.

The two vectors act as a two dimensional repeat factor that determins eight new positions for the tiles.

NOTE  Definition according to ISO 10303-46:
The fill area style tiles defines a two dimensional tile to be used for the filling of annotation fill areas or other closed regions. The content of a tile is defined by the tile set, and the placement of each tile determined by the filling pattern which indicates how to place tiles next to each other. Tiles or parts of tiles outside of the annotation fill area or closed region shall be clipped at the of the area or region.

I + k~1~* R~1~ + k~2~* R~2~      k~1~,k~2~= -1,0,1 , formula

Figure 1 shows the use of a vector for hatch line distances

"IfcFillAreaStyleTiles_Fig1.gif 12,9 KB"

NOTE  Entity adapted from fill_area_style_tiles defined in ISO10303-46

HISTORY  New entity in IFC2x2.

IFC4 CHANGE  TilingPattern changed to list of two IfcVector, Tiles refer directly to IfcStyledItem.

8.12.3.16.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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 LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item 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 StyledByItem has been added.
IfcGeometricRepresentationItem
IfcFillAreaStyleTiles
1 TilingPattern LIST [2:2] OF IfcVector A two direction repeat factor defining the shape and relative positioning of the tiles.

> IFC4 CHANGE  The attribute type has changed to directly reference two IfcVector's.
2 Tiles SET [1:?] OF IfcStyledItem A set of constituents of the tile being a styled item that is used as the annotation symbol for tiling the filled area.

> IFC4 CHANGE The data type has been changed to IfcStyledItem.

> NOTE  Only IfcStyleItem's that refer to a compatible geometric representation item and presentation style shall be used.
3 TilingScale IfcPositiveRatioMeasure The scale factor applied to each tile as it is placed in the annotation fill area.

8.12.3.16.2 Entity inheritance

dot_inheritance IfcFillAreaStyleTiles IfcFillAreaStyleTiles IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcFillAreaStyleTiles->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.12.3.16.3 Formal representations

ENTITY IfcFillAreaStyleTiles
 SUBTYPE OF (IfcGeometricRepresentationItem);
	TilingPattern : LIST [2:2] OF IfcVector;
	Tiles : SET [1:?] OF IfcStyledItem;
	TilingScale : IfcPositiveRatioMeasure;
END_ENTITY;