# psMat

psMat.identity()

  returns an identity matrix as a 6 element tuple

psMat.compose(mat1, mat2)

  returns a matrix which is the composition of the two input transformations

psMat.inverse(mat)

  returns a matrix which is the inverse of the input transformation. (Note: There will not always be an inverse)

psMat.rotate(theta)

  returns a matrix which will rotate by `theta`. `theta` is expressed in radians

psMat.scale(x[, y])

  returns a matrix which will scale by `x` in the horizontal direction and `y` in the vertical. If `y` is omitted, it will scale by the same amount (`x`) in both directions

psMat.skew(theta)

  returns a matrix which will skew by `theta` (to produce an oblique font). `theta` is expressed in radians

psMat.translate(x, y)

  returns a matrix which will translate by `x` in the horizontal direction and `y` in the vertical