D3DXMatrixTransformation2D function (D3dx9math.h)
Note
The D3DX utility library is deprecated. We recommend that you use DirectXMath instead.
Builds a 2D transformation matrix that represents transformations in the xy plane. NULL arguments are treated as identity transformations.
Syntax
D3DXMATRIX* D3DXMatrixTransformation2D(
_Inout_ D3DXMATRIX *pOut,
_In_ const D3DXVECTOR2 *pScalingCenter,
_In_ FLOAT pScalingRotation,
_In_ const D3DXVECTOR2 *pScaling,
_In_ const D3DXVECTOR2 *pRotationCenter,
_In_ FLOAT Rotation,
_In_ const D3DXVECTOR2 *pTranslation
);
Parameters
-
pOut [in, out]
-
Type: D3DXMATRIX*
Pointer to the D3DXMATRIX structure that contains the result of the transformations.
-
pScalingCenter [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, a point identifying the scaling center. If this argument is NULL, an identity Msc matrix is applied to the formula in Remarks.
-
pScalingRotation [in]
-
Type: FLOAT
The scaling rotation factor.
-
pScaling [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, a point identifying the scale. If this argument is NULL, an identity Mₛ matrix is applied to the formula in Remarks.
-
pRotationCenter [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, a point identifying the rotation center. If this argument is NULL, an identity Mrc matrix is applied to the formula in Remarks.
-
Rotation [in]
-
Type: FLOAT
The angle of rotation in radians.
-
pTranslation [in]
-
Type: const D3DXVECTOR2*
Pointer to a D3DXVECTOR2 structure, identifying 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 contains the transformation matrix.
Remarks
This function calculates the transformation matrix with the following formula, with matrix concatenation evaluated in left-to-right order:
Mout = (Msc)⁻¹* (Msr)⁻¹* Mₛ * Msr * Msc * (Mrc)⁻¹* Mr * Mrc * Mₜ
where:
Mout = output matrix (pOut)
Msc = scaling center matrix (pScalingCenter)
Msr = scaling rotation matrix (pScalingRotation)
Mₛ = scaling matrix (pScaling)
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 D3DXMatrixTransformation2D function can be used as a parameter for another function.
For 3D transformations, use D3DXMatrixTransformation.
Requirements
| Requirement | Value |
|---|---|
| Header |
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| Library |
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See also