IfcEllipseProfileDef

Definition from IAI: The IfcEllipseProfileDef defines an ellipse as the profile definition used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute.

> HISTORY: New entity in IFC Release 2x

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 location of the position coordinate system defines the center of the ellipse. The SemiAxis1 attribute defines the first radius of the ellipse in the direction of the x axis, the SemiAxis2 attribute defines the second radius of the ellipse in the direction of the y axis.

Table: Parameter for ellipse profile definition

> NOTE: The semi axes of the ellipse are rectangular to each other by definition.

EXPRESS specification:

ENTITY IfcEllipseProfileDef
SUBTYPE OF ( | IfcParameterizedProfileDef);
SemiAxis1 | : | IfcPositiveLengthMeasure;
SemiAxis2 | : | IfcPositiveLengthMeasure;
END_ENTITY;

Attribute definitions:

SemiAxis1 | : | The first radius of the ellipse. It is measured along the direction of Position.P[1].
SemiAxis2 | : | The second radius of the ellipse. It is measured along the direction of Position.P[2].

Inheritance graph

ENTITY IfcEllipseProfileDef;
ENTITY IfcProfileDef;
ProfileType | : | IfcProfileTypeEnum;
ProfileName | : | OPTIONAL IfcLabel;
ENTITY IfcParameterizedProfileDef;
Position | : | IfcAxis2Placement2D;
ENTITY IfcEllipseProfileDef;
SemiAxis1 | : | IfcPositiveLengthMeasure;
SemiAxis2 | : | IfcPositiveLengthMeasure;
END_ENTITY;