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

See Also

Concepts

Structures, Styles, Callbacks, and Message Maps

CRgn::CreateFromData