Method
PangoMatrixtransform_distance
since: 1.16
Declaration [src]
void
pango_matrix_transform_distance (
const PangoMatrix* matrix,
double* dx,
double* dy
)
Description [src]
Transforms the distance vector (dx,dy) by matrix.
This is similar to pango_matrix_transform_point(),
except that the translation components of the transformation
are ignored. The calculation of the returned vector is as follows:
dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;
Affine transformations are position invariant, so the same vector
always transforms to the same vector. If (x1,y1) transforms
to (x2,y2) then (x1+dx1,y1+dy1) will transform to
(x1+dx2,y1+dy2) for all values of x1 and x2.
Available since: 1.16