_transform.sass

// CSS Transform and Transform-Origin

// Apply a transform sent as a complete string
=apply-transform(!transform = false)
  transform= !transform
  -webkit-transform= !transform
  -moz-transform= !transform

// Apply a transform-origin sent as a complete string
=apply-origin(!origin = false)
  transform-origin= !origin
  -webkit-transform-origin= !origin
  -moz-transform-origin= !origin

// transform-origin requires x and y coordinates
//  - only applies the coordinates if they are there
//    so that it can be called by scale, rotate and skew safely
=transform-origin(!originx = 50%, !originy = 50%)
  !origin = false
  @if !originx and !originy
    !origin = "#{!originx} #{!originy}"
  @else if !originx
    !origin = "#{!originx}"
  @else if !originy
    !origin = "#{!originy}"
  @if !origin 
    +apply-origin(!origin)

// A full transform mixin with everything you could want
//  - including origin adjustments if you want them
//  - scale, rotate and skew don't require units
//    scale takes a multiplier, rotate and skew take degrees
=transform(!scale = 1, !rotate = 0, !transx = 0, !transy = 0, !skewx = 0, !skewy = 0, !originx = false, !originy = false)
  !transform = "scale(#{!scale}) rotate(#{!rotate}deg) translate(#{!transx}, #{!transy}) skew(#{!skewx}deg, #{!skewy}deg)"
  +apply-transform(!transform)
  +transform-origin(!originx, !originy)

// Transform Partials
// These work well on their own, but they don't add to each other, they override
// Use them with extra origin args, or along side +transform-origin

// adjust only the scale
//  - with optional origin coordinates
=scale(!scale = 1.25, !originx = false, !originy = false)
  +apply-transform("scale(#{!scale})")
  +transform-origin(!originx, !originy)

// adjust only the rotation
//  - with optional origin coordinates
=rotate(!rotate = 45, !originx = false, !originy = false)
  +apply-transform("rotate(#{!rotate}deg)")
  +transform-origin(!originx, !originy)

// adjust only the translation
=translate(!transx = 0, !transy = 0)
  +apply-transform("translate(#{!transx}, #{!transy})")

// adjust only the skew
//  - with optional origin coordinates
=skew(!skewx = 0, !skewy = 0, !originx = false, !originy = false)
  +apply-transform("skew(#{!skewx}deg, #{!skewy}deg)")
  +transform-origin(!originx, !originy)