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Builds a 2-D affine transformation matrix in the x-y plane. NULL arguments are treated as identity transformations.
Syntax
D3DXMATRIX *WINAPI D3DXMatrixAffineTransformation2D(
D3DXMATRIX *pOut, FLOAT Scaling, CONST D3DXVECTOR2 *pRotationCenter, FLOAT Rotation, CONST D3DXVECTOR2 *pTranslation );
Parameters
- pOut
- [in, out] Pointer to the D3DXMATRIX structure that is the result of the operation.
- Scaling
- [in] Scaling factor.
- pRotationCenter
- [in] 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] The angle of rotation.
- pTranslation
- [in] 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
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 3-D affine transformations, use D3DXMatrixAffineTransformation.
Function Information
Header d3dx9math.h Import library d3dx9.lib Minimum operating systems Windows 98
See Also
D3DXMatrixTransformation2D, Matrix Transforms