vendor/transformation-matrix/skew.js
function skewDEG(ax, ay) {
    return skew(ax * Math.PI / 180, ay * Math.PI / 180);
}
function skewDEG(ax, ay) {
    return skew(ax * Math.PI / 180, ay * Math.PI / 180);
}
function skewDEG ( ax , ay ) { return skew ( ax * Math . PI / 180 , ay * Math . PI / 180 ) ; }
Calculate a skew matrix using DEG angles
@param ax Skew on axis x
@param ay Skew on axis y
@returns {{a: number, b: number, c: number, e: number, d: number, f: number}} Affine matrix
Calculate a skew matrix using DEG angles