Transforms the distance vector (@dx,@dy) by @matrix.
This is similar to [method@Pango.Matrix.transform_point],
except that the translation components of the transformation
are ignored. The calculation of the returned vector is as follows:
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.
Transforms the distance vector (@dx,@dy) by @matrix.
This is similar to [method@Pango.Matrix.transform_point], except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows:
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.