IFC 4.3.x development

8.15.3.22 IfcRoundedRectangleProfileDef

Change log

IFC4

additionswhere_rulesValidRadius
deletionswhere_rulesWR31

8.15.3.22.1 Semantic definitions at the entity

IfcRoundedRectangleProfileDef defines a rectangle with equally rounded corners as the profile definition used by the swept surface geometry or the swept area solid. It is given by the X extent, the Y extent, and the radius for the rounded corners, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system, that is, in the center of the bounding box.

HISTORY  New entity in IFC2x.

IFC2x CHANGE  The IfcRoundedRectangleProfileDef is now subtyped from IfcRectangleProfileDef. The XDim and YDim attributes have been removed (now inherited from supertype).

Figure 1 illustrates parameters of the rounded rectangle profile definition.

rounded rectangle profile

Position
The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions.

By using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (e.g. upper-left bound).

Parameter
The IfcRoundedRectangleProfileDef is defined within the position coordinate system, where the XDim defines the measure for the length of the rectangle (half along the positive x-axis), the YDim defines the length measure for the width of the rectangle (half along the positive y-axis) and the RoundingRadius defines the radius of curvature in all four corners of the rectangle.

Figure 1 — Rounded rectangle profile

8.15.3.22.1 Attributes

# Attribute Type Description
IfcProfileDef
1 ProfileType IfcProfileTypeEnum Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid.
2 ProfileName OPTIONAL IfcLabel Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in _IfcExternalReference.ItemReference_.
HasExternalReferenceSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to external information, e.g. library, classification, or document information, which is associated with the profile.

> IFC4 CHANGE New inverse attribute

HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition Additional properties of the profile, for example mechanical properties.

> IFC4 CHANGE New inverse attribute

IfcParameterizedProfileDef
3 Position OPTIONAL IfcAxis2Placement2D Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.
IfcRectangleProfileDef
4 XDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the x-axis.
5 YDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the y-axis.
IfcRoundedRectangleProfileDef
6 RoundingRadius IfcPositiveLengthMeasure Radius of the circular arcs by which all four corners of the rectangle are equally rounded.

8.15.3.22.2 Entity inheritance

dot_inheritance IfcRoundedRectangleProfileDef IfcRoundedRectangleProfileDef IfcRectangleProfileDef IfcRectangleProfileDef IfcRoundedRectangleProfileDef->IfcRectangleProfileDef IfcRectangleHollowProfileDef IfcRectangleHollowProfileDef IfcRectangleHollowProfileDef->IfcRectangleProfileDef IfcParameterizedProfileDef IfcParameterizedProfileDef IfcRectangleProfileDef->IfcParameterizedProfileDef IfcParameterizedProfileDef_children 10 more... IfcParameterizedProfileDef_children->IfcParameterizedProfileDef IfcProfileDef IfcProfileDef IfcParameterizedProfileDef->IfcProfileDef IfcProfileDef_children 5 more... IfcProfileDef_children->IfcProfileDef

8.15.3.22.3 Definitions applying to General Usage

8.15.3.22.3.1 Property Sets for Objects

PsetName
'Pset_ProfileMechanical'

8.15.3.22.4 Formal representations

ENTITY IfcRoundedRectangleProfileDef
 SUBTYPE OF (IfcRectangleProfileDef);
	RoundingRadius : IfcPositiveLengthMeasure;
 WHERE
	ValidRadius : ((RoundingRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND 
 (RoundingRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
END_ENTITY;