8.12.3.14 IfcFillAreaStyle

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8.12.3.14.1 Semantic definition

An IfcFillAreaStyle provides the style table for presentation information assigned to annotation fill areas or surfaces for hatching and tiling. The IfcFillAreaStyle_defines hatches as model hatches, that is, the distance between hatch lines, or the curve patterns of hatch lines are given in model space dimensions (that have to be scaled using the target plot scale). The _IfcFillAreaStyle allows for the following combinations of defining the style of hatching and tiling:

Solid fill for areas and surfaces by only assigning IfcColour to the set of FillStyles. It then provides the background colour for the filled area or surface.

Vector based hatching for areas and surfaces based on a single row of hatch lines by assigning a single instance of IfcFillAreaStyleHatching to the set of FillStyles.
If an instance of IfcColour is assigned in addition to the set of FillStyles, it provides the background colour for the hatching.
Vector based hatching for areas and surfaces based on two (potentially crossing) rows of hatch lines by assigning two instances of IfcFillAreaStyleHatching to the set of FillStyles.
If an instance of IfcColour is assigned in addition to the set of FillStyles, it provides the background colour for the hatching.

Externally defined hatch style by assigning a single instance of IfcExternallyDefinedHatchStyle to the set of FillStyles.
If an instance of IfcColour is assigned in addition to the set of FillStyles, it provides the background colour for the hatching.

Measures given to a hatch or tile pattern are given in global drawing length units.

The measure values for hatch or tile pattern apply to the model space with a target plot scale provided for the correct appearance in the default plot scale.

DEPRECATION The use of IfcFillAreaStyleTiles is deprecated, as its definition might change is future releases.

8.12.3.14.2 Entity inheritance

- IfcPresentationStyle

8.12.3.14.3 Attributes

#	Attribute	Type	Description
IfcPresentationStyle (1)
1	Name	OPTIONAL IfcLabel	Name of the presentation style.
Click to show 1 hidden inherited attributes Click to hide 1 inherited attributes
IfcFillAreaStyle (2)
2	FillStyles	SET [1:?] OF IfcFillStyleSelect	The set of fill area styles to use in presenting visible curve segments, annotation fill areas or surfaces.
3	ModelOrDraughting	OPTIONAL IfcBoolean	Indication whether the length measures provided for the presentation style are model based, or draughting based. IFC4-CHANGE New attribute.

Table 8.12.3.14.A

8.12.3.14.4 Formal propositions

Name	Description
ConsistentHatchStyleDef	Either the fill area style contains a definition from an externally defined hatch style, or from (one or many) fill area style hatchings or from (one or many) fill area style tiles, but not a combination of those three types.
`IfcCorrectFillAreaStyle(SELF.FillStyles)`
MaxOneColour	There shall be a maximum of one colour assignment to the fill area style.
`SIZEOF(QUERY(Style <* SELF.FillStyles \| 'IFC4X3_DEV_20bdb3d.IFCCOLOUR' IN TYPEOF(Style) )) <= 1`
MaxOneExtHatchStyle	There shall be a maximum of one externally defined hatch style assignment to the fill area style.
`SIZEOF(QUERY(Style <* SELF.FillStyles \| 'IFC4X3_DEV_20bdb3d.IFCEXTERNALLYDEFINEDHATCHSTYLE' IN TYPEOF(Style) )) <= 1`

Table 8.12.3.14.B

8.12.3.14.5 Formal representation

ENTITY IfcFillAreaStyle
 SUBTYPE OF (IfcPresentationStyle);
	FillStyles : SET [1:?] OF IfcFillStyleSelect;
	ModelOrDraughting : OPTIONAL IfcBoolean;
 WHERE
	ConsistentHatchStyleDef : IfcCorrectFillAreaStyle(SELF.FillStyles);
	MaxOneColour : SIZEOF(QUERY(Style <* SELF.FillStyles |
  'IFC4X3_DEV_20bdb3d.IFCCOLOUR' IN
   TYPEOF(Style)
  )) <= 1;
	MaxOneExtHatchStyle : SIZEOF(QUERY(Style <* SELF.FillStyles |
  'IFC4X3_DEV_20bdb3d.IFCEXTERNALLYDEFINEDHATCHSTYLE' IN
   TYPEOF(Style)
  )) <= 1;
END_ENTITY;

8.12.3.14.6 References

IfcPresentationStyle