Vector2.Ccw Method

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Returns the z component by calculating the cross product of two 2-D vectors.

Definition

Visual Basic Public Shared Function Ccw( _
    ByVal left As Vector2, _
    ByVal right As Vector2 _
) As Single

C# public static float Ccw(
    Vector2 left,
    Vector2 right
);

C++ public:
static float Ccw(
    Vector2 left,
    Vector2 right
);

JScript public static function Ccw(
    left : Vector2,
    right : Vector2
) : float;

Visual Basic	Public Shared Function Ccw( _ ByVal left As Vector2, _ ByVal right As Vector2 _ ) As Single
C#	public static float Ccw( Vector2 left, Vector2 right );
C++	public: static float Ccw( Vector2 left, Vector2 right );
JScript	public static function Ccw( left : Vector2, right : Vector2 ) : float;

Parameters

left Microsoft.DirectX.Vector2
Source Vector2 structure.

right Microsoft.DirectX.Vector2
Source Vector2 structure.

Return Value

System.Single
The z component.

Remarks

This method determines the z component by calculating the cross product based on the following formula.

((x1,y1,0) cross (x2,y2,0))

The following C# code fragment provides an example.
[C#]
left->x * right->y - left->y * right->x
If the z component's value is positive, the vector right is counterclockwise from the vector left. This information is useful for back-face culling.

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left	Microsoft.DirectX.Vector2 Source Vector2 structure.
right	Microsoft.DirectX.Vector2 Source Vector2 structure.