skew matrix algorithm

Question

I\'m looking for skew algorithm, just like on photoshop, edit->transform->skew is there any simple matrix which could do that?

what I\'ve seen so far was basic skew

Answer 1

Looking at http://www.w3.org/TR/SVG11/coords.html, which talks about SVG, it says:

• A skew transformation along the x-axis is equivalent to the matrix

or [1 0 tan(a) 1 0 0], which has the effect of skewing X coordinates by angle a.

• A skew transformation along the y-axis is equivalent to the matrix

or [1 tan(a) 0 1 0 0], which has the effect of skewing Y coordinates by angle a.

Hope that helps! :)