# Rotate any jQuery selected element.
# Credit: https://gist.github.com/hoandang/5989980
# Credit: https://stackoverflow.com/a/15191130/1544937
$.fn.rotate = (degree = 0, duration = 1000) ->

    element = $(this)

    rotation = ->

        matrix = element.css "-webkit-transform" or
                 element.css "-moz-transform"    or
                 element.css "-ms-transform"     or
                 element.css "-o-transform"      or
                 element.css "transform"

        if matrix isnt "none"

            matrix = matrix.split("(")[1].split(")")[0].split(",")

            return Math.round Math.atan2(matrix[1], matrix[0]) * (180 / Math.PI)

        else

            return 0

    rotation = rotation()

    if rotation isnt degree

        $("deg": rotation).animate "deg": degree,

            "duration": duration
            "step": (now) =>

                element.css "transform": "rotate(" + now + "deg)"