This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
swffill->skewxto() sets fill x-skew to x.
For x is 1.0, it is a 45-degree
forward slant. More is more forward, less is more backward.
