D3DXMatrixTransformation2D

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

D3DXMATRIX * 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 M_sc matrix is applied to the formula in Remarks.

pScalingRotation

[in] The scaling rotation factor.

pScaling

[in] Pointer to a D3DXVECTOR2 structure, a point identifying the scale. If this argument is NULL, an identity M_s 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 M_rc 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 M_t matrix is applied to the formula in Remarks.

Return Values

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:

M_out = (M_sc)^-1* (M_sr)^-1* M_s * M_sr * M_sc * (M_rc)^-1* M_r * M_rc * M_t

where:

M_out = output matrix (pOut)

M_sc = scaling center matrix (pScalingCenter)

M_sr = scaling rotation matrix (pScalingRotation)

M_s = scaling matrix (pScaling)

M_rc = center of rotation matrix (pRotationCenter)

M_r = rotation matrix (Rotation)

M_t = 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

Header: Declared in D3dx9math.h.

See Also

D3DXMatrixAffineTransformation2D, Transforms