XFORM structure (wingdi.h)
The XFORM structure specifies a world-space to page-space transformation.
Syntax
typedef struct tagXFORM {
FLOAT eM11;
FLOAT eM12;
FLOAT eM21;
FLOAT eM22;
FLOAT eDx;
FLOAT eDy;
} XFORM, *PXFORM, *LPXFORM;
Members
eM11
The following.
| Operation | Meaning |
|---|---|
| Scaling | Horizontal scaling component |
| Rotation | Cosine of rotation angle |
| Reflection | Horizontal component |
eM12
The following.
| Operation | Meaning |
|---|---|
| Shear | Horizontal proportionality constant |
| Rotation | Sine of the rotation angle |
eM21
The following.
| Operation | Meaning |
|---|---|
| Shear | Vertical proportionality constant |
| Rotation | Negative sine of the rotation angle |
eM22
The following.
| Operation | Meaning |
|---|---|
| Scaling | Vertical scaling component |
| Rotation | Cosine of rotation angle |
| Reflection | Vertical reflection component |
eDx
The horizontal translation component, in logical units.
eDy
The vertical translation component, in logical units.
Remarks
The following list describes how the members are used for each operation.
| Operation | eM11 | eM12 | eM21 | eM22 |
|---|---|---|---|---|
| Rotation | Cosine | Sine | Negative sine | Cosine |
| Scaling | Horizontal scaling component | Not used | Not used | Vertical Scaling Component |
| Shear | Not used | Horizontal Proportionality Constant | Vertical Proportionality Constant | Not used |
| Reflection | Horizontal Reflection Component | Not used | Not used | Vertical Reflection Component |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Header | wingdi.h (include Windows.h) |
See also
Coordinate Space and Transformation Structures