D3DXMatrixAffineTransformation2D function (D3dx9math.h)
Note
The D3DX utility library is deprecated. We recommend that you use DirectXMath instead.
Builds a 2D affine transformation matrix in the xy plane. NULL arguments are treated as identity transformations.
Syntax
D3DXMATRIX* D3DXMatrixAffineTransformation2D(
_Inout_ D3DXMATRIX *pOut,
_In_ FLOAT Scaling,
_In_ const D3DXVECTOR2 *pRotationCenter,
_In_ FLOAT Rotation,
_In_ const D3DXVECTOR2 *pTranslation
);
Parameters
-
pOut [in, out]
-
Type: D3DXMATRIX*
Pointer to the D3DXMATRIX structure that is the result of the operation.
-
Scaling [in]
-
Type: FLOAT
Scaling factor.
-
pRotationCenter [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, a point identifying the center of rotation. If this argument is NULL, an identity Mrc matrix is applied to the formula in Remarks.
-
Rotation [in]
-
Type: FLOAT
The angle of rotation.
-
pTranslation [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, representing the translation. If this argument is NULL, an identity Mₜ matrix is applied to the formula in Remarks.
Return value
Type: D3DXMATRIX*
Pointer to a D3DXMATRIX structure that is an affine transformation matrix.
Remarks
This function calculates the affine transformation matrix with the following formula, with matrix concatenation evaluated in left-to-right order:
Mout = Mₛ * (Mrc)⁻¹ * Mr * Mrc * Mₜ
where:
Mout = output matrix (pOut)
Mₛ = scaling matrix (Scaling)
Mrc = center of rotation matrix (pRotationCenter)
Mr = rotation matrix (Rotation)
Mₜ = translation matrix (pTranslation)
The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixAffineTransformation2D function can be used as a parameter for another function.
For 3D affine transformations, use D3DXMatrixAffineTransformation.
Requirements
| Requirement | Value |
|---|---|
| Header |
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| Library |
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See also