#### IfcSameDirection

##### Semantic definitions at the function

Function Definition

The function compares two IfcDirection's and ensures that they are the same (with an epsilon precision factor).

> HISTORY: New function in Release IFC2x Edition 2

##### Formal representations

EXPRESS Specification

FUNCTION IfcSameDirection
(dir1, dir2 : IfcDirection; Epsilon : REAL)
: LOGICAL;
LOCAL
dir1x : REAL := dir1.DirectionRatios[1];
dir1y : REAL := dir1.DirectionRatios[2];
dir1z : REAL := 0;
dir2x : REAL := dir2.DirectionRatios[1];
dir2y : REAL := dir2.DirectionRatios[2];
dir2z : REAL := 0;
END_LOCAL;
IF (SIZEOF(dir1.DirectionRatios) > 2) THEN
dir1z := dir1.DirectionRatios[3];
END_IF;
IF (SIZEOF(dir2.DirectionRatios) > 2) THEN
dir2z := dir2.DirectionRatios[3];
END_IF;
RETURN (IfcSameValue(dir1x,dir2x,Epsilon) AND
IfcSameValue(dir1y,dir2y,Epsilon) AND
IfcSameValue(dir1z,dir2z,Epsilon));
END_FUNCTION;

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