XFORM
The XFORM
structure specifies a world-space to page-space transformation.
typedef struct
_XFORM { // xfrm
FLOAT
eM11;
FLOAT
eM12;
FLOAT
eM21;
FLOAT
eM22;
FLOAT eDx;
FLOAT eDy;
} XFORM;
Members
eM11
Specifies the
following:
|
Operation |
Meaning |
|
Scaling |
Horizontal
scaling component |
|
Rotation |
Cosine of
rotation angle |
|
Reflection |
Horizontal
component |
eM12
Specifies the
following:
|
Operation |
Meaning |
|
Shear |
Horizontal
proportionality constant |
|
Rotation |
Sine of the
rotation angle |
eM21
Specifies the
following:
|
Operation |
Meaning |
|
Shear |
Vertical
proportionality constant |
|
Rotation |
Negative
sine of the rotation angle |
eM22
Specifies the
following:
|
Operation |
Meaning |
|
Scaling |
Vertical
scaling component |
|
Rotation |
Cosine of
rotation angle |
|
Reflection |
Vertical
reflection component |
eDx
Specifies the
horizontal translation component.
eDy
Specifies the
vertical translation component.
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 |
Nothing |
Nothing |
Vertical
Scaling Component |
|
Shear |
Nothing |
Horizontal
Proportionality Constant |
Vertical
Proportionality Constant |
Nothing |
|
Reflection |
Horizontal
Reflection Component |
Nothing |
Nothing |
Vertical
Reflection Component |
See Also