SOTRANSFORM

Contains information about a transformation for use with vector graphics output.

typedef struct SOTRANSFORMtag {

WORD wTransformFlags; // see below

SOPOINT Origin; // see below

INT xOffset; // see below

INT yOffset; // see below

SORATIO xScale; // see below

SORATIO yScale; // see below

SORATIO xSkew; // see below

SORATIO ySkew; // see below

SOANGLE RotationAngle; // see below

} SOTRANSFORM, VWPTR *PSOTRANSFORM;

Members

wTransformFlags

Type of transformation. This member can be a combination of these values:

SOTF_NOTRANSFORM	SOTF_XSKEW
SOTF_ROTATE	SOTF_YOFFSET
SOTF_XOFFSET	SOTF_YSCALE
SOTF_XSCALE	SOTF_YSKEW

TSOTF_ROTATE may be combined only with SOTF_XOFFSET and SOTF_YOFFSET. In addition, no other values may be combined with SOTF_NOTRANSFORM.

Origin

Point of origin for all transformations, except for SOTF_XOFFSET and SOTF_YOFFSET.

xOffset and yOffset

Offset values to use for the SOTF_XOFFSET and OTF_YOFFSET transformations. The x and y members of this value are added to the x- and y-coordinates of all points in the transformed object.

xScale

Ratio to use for SOTF_XSCALE transformations. This ratio is used to scale the image on the x-axis from the given origin. To set this member, use the SOSETRATIO macro.

yScale

Ratio to use for SOTF_YSCALE transformations. This ratio is used to scale the image on the y-axis from the given origin. To set this member, use the SOSETRATIO macro.

xSkew

Ratio to use for SOTF_XSKEW transformations. This ratio used to skew the image horizontally from the given origin. To set this member, use the SOSETRATIO macro.

ySkew

Ratio to use for SOTF_YSKEW transformations. This ratio used to skew the image vertically from the given origin. To set this member, use the SOSETRATIO macro.

RotationAngle

Angle, in tenths of a degree, to use for SOTF_ROTATE transformations. All points are rotated this many degrees about the given origin. This value must be set by using the SOANGLETENTHS macro. A SOANGLE variable should not be set directly. Additional macros will be made available as needed.

The transformation equation follows.

x' = Origin.x + (xScale * (x-Origin.x)) + (xSkew*(y-Origin.y)) + xOffset
y' = Origin.y + (yScale * (y-Origin.y)) + (ySkew*(x-Origin.x)) + yOffset

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