Function to calculate an element's bounds

calculate_bounds.coffee

calculateBounds: ($element) ->
  offset = $element.offset()
  width  = $element.width()
  height = $element.height()

  {
    nw: 
      x: offset.left
      y: offset.top
    ne: 
      x: offset.left + width
      y: offset.top
    se: 
      x: offset.left + width
      y: offset.left + height
    sw: 
      x: offset.left
      y: offset.top + height
      }