#### IfcOrthogonalComplement

##### Semantic definitions at the function

Function Definition

Definition from ISO/CD 10303-42:1992: This function returns a direction which is the orthogonal complement of the input direction. The input direction must be a two-dimensional direction and the result is a vector of the same type and perpendicular to the input vector.

> NOTE Corresponding STEP function: orthogonal_complement. Please refer to ISO/IS 10303-42:1994, p.101 for the final definition of the formal standard.
> HISTORY New function in IFC Release 1.5

##### Formal representations

EXPRESS Specification

FUNCTION IfcOrthogonalComplement
(Vec : IfcDirection)
: IfcDirection;
LOCAL
Result : IfcDirection ;
END_LOCAL;
IF NOT EXISTS (Vec) OR (Vec.Dim <> 2) THEN
RETURN(?);
ELSE
Result := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcDirection([-Vec.DirectionRatios[2], Vec.DirectionRatios[1]]);
RETURN(Result);
END_IF;
END_FUNCTION;

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