dx
,dy
) by matrix
. This is
similar to cairoMatrixTransformPoint
except that the translation
components of the transformation are ignored. The calculation of
the returned vector is as follows:cairoMatrixTransformDistance(matrix, dx, dy)
matrix
dx
dy
dx2 = dx1 * a + dy1 * c; dy2 = dx1 * b + dy1 * d;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
.