IfcAnnotationFillAreaOccurrence
Definition
from ISO/CD 10303-46:1992: An
annotation fill area
occurrence is a fill area with a style assignment.
NOTE
Corresponding STEP
name: annotation_fill_area_occurrence. Please refer to ISO/IS
10303-46:1994 for the final definition of the formal standard.
Definition
from IAI: The IfcAnnotationFillAreaOccurrence
shall only be used within a material or paper space
dependent representation (note: paper space is not yet supported within
this IFC release). Styled filled areas within model
space shall use IfcStyledItem as the instance to
link the geometric filled area representation item to the (shared)
style information.
An IfcAnnotationFillAreaOccurrence
is a relation object, that assigns a (set of) styles to a
representation item. It can be used without having a geometric
representation item already assigned, e.g. within an IfcMaterialDefinitionRepresentation.
If it has a geometric representation item already assigned than this is
further restricted to be a subtype of IfcAnnotationFillArea.
The applicable style information is restricted to be an IfcFillAreaStyle. For
each instance of a styled fill area, one instance of IfcAnnotationFillAreaOccurrence
has to be created, that points, via an IfcPresentationStyleAssignment,
to an IfcFillAreaStyle,
that can be shared by many styled fill areas.
The IfcAnnotationFillAreaOccurrence
determines how an IfcFillAreaStyle,
and in particular how an
included IfcFillAreaStyleHatching
or IfcFillAreaStyleTiles,
is placed at a particular annotation occurrence. The FillStyleTarget
specifies the point (if omited it defaults to the origin) at which the
(virtual) point of origin of the hatching style is placed, it can
either be:
- a point relative to the
world coordinate system (if GlobalOrLocal
= .GLOBAL.), or
- a point relative to the
local (object) coordinate system (if GlobalOrLocal
= .LOCAL.), or
- a point relative to the
surface parameterization (if GlobalOrLocal
is omited).
HISTORY
New entity in
Release IFC2x Edition 2.
IFC2x
Edition 3 CHANGE The IfcAnnotationFillAreaOccurrence
has changed by making the attribute FillStyleTarget
OPTIONAL and by adding the attribute GlobalOrLocal.
EXPRESS specification:
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| ENTITY IfcAnnotationFillAreaOccurrence
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| WR31
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NOT(EXISTS(SELF\IfcStyledItem.Item)) OR
('IFCPRESENTATIONDEFINITIONRESOURCE.IFCANNOTATIONFILLAREA' IN TYPEOF (SELF\IfcStyledItem.Item));
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Attribute definitions:
| FillStyleTarget
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The point that specifies the starting location for the fill area style assigned to the annotation fill area occurrence. Depending on the attribute GlobalOrLocal the point is either given within the world coordinate system of the project or within the object coordinate system of the element or annotation. If the FillStyleTarget is not given, it defaults to 0.,0.
IFC2x Edition 3 CHANGE The attribute has been made OPTIONAL.
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| GlobalOrLocal
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The coordinate system in which the FillStyleTarget point is given. Depending on the attribute GlobalOrLocal the point is either given within the world coordinate system of the project or within the object coordinate system of the element or annotation. If not given, the hatch style is directly applied to the parameterization of the geometric representation item, e.g. to the surface coordinate sytem, defined by the surface normal.
IFC2x Edition 3 CHANGE The attribute has been added.
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Formal Propositions:
| WR31
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The Item that is styled by an IfcAnnotationFillAreaOccurrence relation shall be (if provided) an IfcAnnotationFillArea.
NOTE If no Item is provided, the IfcAnnotationFillAreaOccurrence is used to provide a fill area style to a material dependent presentation.
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Inheritance graph
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| ENTITY IfcAnnotationFillAreaOccurrence;
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