UnsafeNativeMethods.Vector2.Ccw(Vector2,Vector2) Method (Microsoft.DirectX)

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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;

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.

See Also