XFORM Structure
The XFORM structure has the following form:
typedef struct tagXFORM { /* xfrm */
FLOAT eM11;
FLOAT eM12;
FLOAT eM21;
FLOAT eM22;
FLOAT eDx;
FLOAT eDy;
} XFORM;
Remarks
The XFORM structure specifies a world-space to page-space transformation. The eDx and eDy members specify the horizontal and vertical translation components, respectively. The following table shows how the other members are used, depending on the operation:
Operation |
eM11 |
eM12 |
eM21 |
eM22 |
|---|---|---|---|---|
Rotation |
Cosine of rotation angle |
Sine of rotation angle |
Negative sine of rotation angle |
Cosine of rotation angle |
Scaling |
Horizontal scaling component |
Nothing |
Nothing |
Vertical scaling component |
Shear |
Nothing |
Horizontal proportionality constant |
Vertical proportionality constant |
Nothing |
Reflection |
Horizontal reflection component |
Nothing |
Nothing |
Vertical reflection component |
Requirements
Header: wingdi.h