# File lib/as_transform2d.rb, line 28 def self.rotate(a) a = a.to_f.deg2rad sin = Math.sin(a) cos = Math.cos(a) AS::Transform2D[ [cos, -sin, 0, 0], [sin, cos, 0, 0], [ 0, 0, 1, 0], [ 0, 0, 0, 1], ] end