Hello www-style,
due to the previous discussion of skew(<angle> [, <angle>])
it turned out, that skew(<angle> [, <angle>]) is currently
undefined and what was reported to be implemented is
not related to skewing and meaningless.
Therefore I would like to propose to define it as follows:
skew(s,a) = rotate(a) skewX(s) rotate(-a).
If a is not provided a=0 is assumed.
What it means:
To skew in an arbitrary direction one can for example
rotate the skew direction into the x-direction, followed
by a skewX and followed by a rotation in the opposite
direction again.
If the skew angle is s and the angle from the x-direction to
the skew direction a, then the corresponding transformation
is rotate(a) skewX(s) rotate(-a).
The attached graphics correspond to examples with s of 40 degree.
The filled samples on the left correspond to an rotation of
90 degree. Note, that for 90 degree this corresponds to
skewY(-s).
The stroked samples provide several skewing directions with
a difference angle of 45 degree.
Olaf
