IfcRoundedRectangleProfileDef

Semantic definitions at the entity

Entity definition

Definition from IAI: The 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, i.e. in the center of the bounding box.

HISTORY: New class in IFC Release 2x

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

Illustration:

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:

IfcSweptSurface.Position
IfcSweptAreaSolid.Position

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.

Table: Parameter of rounded rectangle profile definition

Attribute definitions

#	Attribute	Type	Cardinality	Description	A
6	RoundingRadius	IfcPositiveLengthMeasure	[1:1]	Radius of the circular arcs, by which all four corners of the rectangle are equally rounded. If not given, zero (= no rounding arcs) applies.	X

Formal Propositions

Rule	Description
WR31	The value of the attribute RoundingRadius shall be lower or equal than either of both, half the value of the Xdim and the YDim attribute.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	A
IfcProfileDef
1	ProfileType	IfcProfileTypeEnum	[1:1]	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.	X
2	ProfileName	-		This attribute is out of scope for this model view definition and shall not be set.
IfcParameterizedProfileDef
3	Position	IfcAxis2Placement2D	[1:1]	Position coordinate system of the parameterized profile definition.	X
IfcRectangleProfileDef
4	XDim	IfcPositiveLengthMeasure	[1:1]	The extent of the rectangle in the direction of the x-axis.	X
5	YDim	IfcPositiveLengthMeasure	[1:1]	The extent of the rectangle in the direction of the y-axis.	X
IfcRoundedRectangleProfileDef
6	RoundingRadius	IfcPositiveLengthMeasure	[1:1]	Radius of the circular arcs, by which all four corners of the rectangle are equally rounded. If not given, zero (= no rounding arcs) applies.	X

Formal representations

XSD Specification

 <xs:element name="IfcRoundedRectangleProfileDef" type="ifc:IfcRoundedRectangleProfileDef" substitutionGroup="ifc:IfcRectangleProfileDef" nillable="true"/>

 <xs:complexType name="IfcRoundedRectangleProfileDef">

  <xs:complexContent>

   <xs:extension base="ifc:IfcRectangleProfileDef">

    <xs:attribute name="RoundingRadius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRoundedRectangleProfileDef

 SUBTYPE OF (IfcRectangleProfileDef);

  RoundingRadius : IfcPositiveLengthMeasure;

 WHERE

  WR31 : ((RoundingRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND 
 (RoundingRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
END_ENTITY;

 EXPRESS-G diagram