D3DXMatrixTransformation2D
Microsoft DirectX 9.0 SDK Update (October 2004)

D3DXMatrixTransformation2D Function


Builds a 2-D transformation matrix that represents transformations in the x-y plane. NULL arguments are treated as identity transformations.

Syntax

D3DXMATRIX *WINAPI D3DXMatrixTransformation2D(      

    D3DXMATRIX *pOut,     CONST D3DXVECTOR2 *pScalingCenter,     FLOAT *pScalingRotation,     CONST D3DXVECTOR2 *pScaling,     CONST D3DXVECTOR2 *pRotationCenter,     FLOAT Rotation,     CONST D3DXVECTOR2 *pTranslation );

Parameters

pOut
[in, out] Pointer to the D3DXMATRIX structure that contains the result of the transformations.
pScalingCenter
[in] 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] Pointer to the scaling rotation factor.
pScaling
[in] 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] 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] The angle of rotation in radians.
pTranslation
[in] 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

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 3-D transformations, use D3DXMatrixTransformation.

Function Information

Headerd3dx9math.h
Import libraryd3dx9.lib
Minimum operating systems Windows 98

See Also

D3DXMatrixAffineTransformation2D, Matrix Transforms


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