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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
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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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