Returns a positive value if the second vector turns to the left relative to the direction of the first vector, a negative value if it turns to the right and 0.0 if the vectors are parallel. The value is the length of the corssproduct of the two vectors in 3D or the area of the paralleogram build by the two vectors.

public static double Orientation(
	GeoVector2D v1,
	GeoVector2D v2
)

Public Shared Function Orientation ( _
	v1 As GeoVector2D, _
	v2 As GeoVector2D _
) As Double

public:
static double Orientation(
	GeoVector2D v1, 
	GeoVector2D v2
)