UnsafeNativeMethods.Vector2.Ccw Method

Language:

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

Note: For programming in Microsoft Visual Basic .NET or Microsoft JScript .NET, use the equivalent method in the Microsoft.DirectX structures.

Definition

Visual Basic Public Shared Function Ccw( _
    ByVal pLeft As Vector2, _
    ByVal pRight As Vector2 _
) As Single

C# public static float Ccw(
    Vector2 pLeft,
    Vector2 pRight
);

C++ public:
static float Ccw(
    Vector2 pLeft,
    Vector2 pRight
);

JScript public static function Ccw(
    pLeft : Vector2,
    pRight : Vector2
) : float;

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

Parameters

pLeft Microsoft.DirectX.Vector2
Source Vector2 structure.

pRight 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.

pLeft	Microsoft.DirectX.Vector2 Source Vector2 structure.
pRight	Microsoft.DirectX.Vector2 Source Vector2 structure.